JP2008020384A - Device for measuring radiation temperature - Google Patents

Device for measuring radiation temperature Download PDF

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JP2008020384A
JP2008020384A JP2006193732A JP2006193732A JP2008020384A JP 2008020384 A JP2008020384 A JP 2008020384A JP 2006193732 A JP2006193732 A JP 2006193732A JP 2006193732 A JP2006193732 A JP 2006193732A JP 2008020384 A JP2008020384 A JP 2008020384A
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infrared
light
measured
light source
detection means
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JP4921057B2 (en
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Akira Miyato
章 宮藤
Kenichiro Takahashi
健一郎 高橋
Katsuhiko Fukui
克彦 福井
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Mikuni Corp
Osaka Gas Co Ltd
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Osaka Gas Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To measure the temperature of an object with high precision without touching it, in spite of its being gray, not being gray, a flat surface, or an uneven surface, in a device for measuring a radiation temperature. <P>SOLUTION: The device includes an infrared light source 10 for emitting infrared rays containing a plurality of different wavelength regions to a workpiece W, radiation light detecting means 30, 40 for detecting infrared intensities in the plurality of differentwavelength regions of radiation light from the workpiece in a state that the infrared light source is turned off, superposed light detecting means 30, 40 for detecting infrared intensities in the plurality of different wavelength regions of superposed light of radiation light from the workpiece and reflected light in a state that the infrared light source is turned on, and a computing means 80 for computing the temperature of the workpiece on the basis of detection information of the radiation light detecting means and the superposed light detecting means. The light source 10 is formed so as to surround the radiation light detecting means and the superposed light detecting means, when looked from a measuring surface side Ws of the workpiece. Thereby, high precision temperature measurement becomes possible even if the measuring surface is uneven. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、赤外線を利用して物体(被測定物)の温度を非接触にて測定する放射温度測定装置に関し、特に、ガス又は電気等のエネルギにより加熱される鍋,フライパン等の調理器具の底面あるいは加熱調理される料理等の物体(被測定物)の温度を非接触にて測定する放射温度測定装置に関する。   The present invention relates to a radiation temperature measurement device that measures the temperature of an object (measurement object) in a non-contact manner using infrared rays, and in particular, a cooking utensil such as a pan or a pan that is heated by energy such as gas or electricity. The present invention relates to a radiation temperature measuring device that measures the temperature of a bottom surface or an object (measurement object) such as a dish to be cooked without contact.

一般に、物体はその温度に応じた赤外線領域のエネルギを放射するため、物体の温度を非接触にて測定するには、予めその物体を形成する物質の放射率を求めて設定し、赤外線センサを用いてその物体から放射される赤外線強度(赤外線の放射エネルギ)を測定する手法が知られている。
従来の放射温度測定装置としては、温度測定に先立って物体(被測定物)に固有の放射率を求めて設定する煩雑さを解消するべく、すなわち、物体(物質)の放射率が分からなくても温度測定を行えるようにするべく、プランクの法則に基づいて、物体から放射される赤外線の放射エネルギを異なる複数の波長領域において測定し、それぞれの放射エネルギの比を求め、その値(赤外線センサの出力比)と温度の対応関係により物体の温度を求めるようにしたものが知られている(例えば、特許文献1参照)。
In general, an object emits energy in the infrared region according to its temperature. Therefore, in order to measure the temperature of an object in a non-contact manner, the emissivity of the substance forming the object is obtained in advance and set. A technique for measuring the intensity of infrared rays (infrared radiation energy) emitted from the object is known.
As a conventional radiation temperature measuring device, in order to eliminate the complexity of obtaining and setting the emissivity specific to the object (object to be measured) prior to temperature measurement, that is, the emissivity of the object (substance) is not known. In order to enable temperature measurement, the infrared radiation energy radiated from the object is measured in a plurality of different wavelength regions based on Planck's law, and the ratio of each radiation energy is obtained (the infrared sensor). Is known in which the temperature of an object is obtained from the correspondence between temperature and the temperature (for example, see Patent Document 1).

しかしながら、この放射温度測定装置では、赤外線の波長領域に拘わらず物体の放射率が一定であることを前提としているため、図11に示すように、物体(物質)が黒体又は灰色体の場合には適合するものの、放射率が赤外線の波長領域によって変化する物体(例えば、アルマイト処理又は有機塗料をコーティングした物体、すなわち、非灰色体)の場合には、赤外線センサの出力比から算出した温度は、実際の温度から大きく逸脱して(ずれて)しまう虞がある。   However, since this radiation temperature measuring device is based on the premise that the emissivity of an object is constant regardless of the infrared wavelength region, as shown in FIG. 11, the object (substance) is a black body or a gray body. In the case of an object whose emissivity varies depending on the infrared wavelength region (for example, an anodized object or an object coated with an organic paint, that is, a non-grey body), the temperature calculated from the output ratio of the infrared sensor May deviate significantly from the actual temperature.

一方、他の放射温度測定装置としては、物体の放射率は、その色や材質あるいは表面状態等により様々に変化することに鑑みて、物体の温度測定に先立って、一つの発光源から物体に所定波長領域の赤外線を照射し、その反射光から物体の反射率を求め、キルヒホッフの法則に基づいて、その反射率からその物体の放射率を求め、この実際に求めた放射率と赤外線センサにより測定した赤外線の放射エネルギから、物体の温度を算出するようにしたものが知られている(例えば、特許文献2参照)。   On the other hand, as another radiation temperature measuring device, in view of the fact that the emissivity of an object varies depending on its color, material, surface condition, etc., from one light source to an object prior to temperature measurement of the object. Irradiate infrared rays in a predetermined wavelength region, determine the reflectance of the object from the reflected light, and based on Kirchhoff's law, determine the emissivity of the object from the reflectance. An apparatus that calculates the temperature of an object from measured infrared radiation energy is known (see, for example, Patent Document 2).

しかしながら、この放射温度測定装置では、放射率を算出することから、物体が非灰色体であっても比較的精度良く温度を測定することができるものの、赤外線を検出する赤外線センサ、赤外線の経路に配置されたレンズ光学系あるいは窓(石英ガラス等)等が汚れを生じ、あるいは、経時変化等を生じて、赤外線センサの検出能力が低下(赤外線センサからの出力される値が低下)すると、その出力値に基づいて算出される反射率、放射率、及び温度は、実際の値から大きく逸脱して(ずれて)しまう虞がある。
また、赤外線を照射する一つの発光源とその反射光を受光する赤外線センサとの配置関係が所定位置からずれた場合、あるいは、赤外線が照射される物体の照射面の面粗度が悪い場合には、前述同様に、出力値に基づいて算出される反射率、放射率、及び温度は、実際の値から大きく逸脱して(ずれて)しまう虞がある。
However, with this radiation temperature measuring device, the emissivity is calculated, so that the temperature can be measured relatively accurately even if the object is a non-gray body. If the lens optical system or window (quartz glass, etc.) is contaminated or changes over time, the detection capability of the infrared sensor decreases (the value output from the infrared sensor decreases). The reflectivity, emissivity, and temperature calculated based on the output value may deviate greatly from the actual values.
Also, when the positional relationship between one light source that emits infrared light and the infrared sensor that receives the reflected light deviates from a predetermined position, or when the surface roughness of the irradiated surface of an object irradiated with infrared light is poor As described above, the reflectance, emissivity, and temperature calculated based on the output value may greatly deviate (shift) from the actual values.

特開平6−137953号公報Japanese Patent Laid-Open No. 6-137933 特開2003−243141号公報JP 2003-243141 A

本発明は、上記従来技術の事情に鑑みて成されたものであり、その目的とするところは、物体(被測定物)が黒体、灰色体、非灰色体のいずれであっても、その物体の放射率を予め設定する必要がなく、物体の測定表面が平面又は凹凸状のいずれであっても、又、経時変化等による影響を受けることなく、被測定物の温度を非接触にて高精度に測定できる放射温度測定装置を提供することにある。   The present invention has been made in view of the circumstances of the prior art described above. The object of the present invention is to determine whether the object (measurement object) is a black body, a gray body, or a non-gray body. It is not necessary to set the emissivity of the object in advance, and the temperature of the object to be measured can be contacted without being affected by changes over time, even if the measurement surface of the object is flat or uneven. An object of the present invention is to provide a radiation temperature measuring device capable of measuring with high accuracy.

本発明の放射温度測定装置は、被測定物に対して複数の異なる波長領域を含む赤外線を照射する赤外光源と、赤外光源をオフにした状態で被測定物からの放射光における複数の異なる波長領域での赤外線強度を検出する放射光検出手段と、赤外光源をオンにした状態で被測定物からの放射光及び反射光の重畳光における複数の異なる波長領域での赤外線強度を検出する重畳光検出手段と、放射光検出手段及び重畳光検出手段の検出情報に基づいて被測定物の温度を演算する演算手段とを備え、上記赤外光源は、被測定物の測定表面側から観て、放射光検出手段及び重畳光検出手段を取り囲むように形成されている、構成となっている。
この構成によれば、放射光検出手段により、赤外光源をオフにした状態で被測定物からの放射光における複数の異なる波長領域での赤外線強度が検出され、又、重畳光検出手段により、赤外光源をオンにした状態で被測定物からの放射光及び反射光の重畳光における複数の異なる波長領域での赤外線強度が検出される。そして、演算手段により、プランクの法則及びキルヒホッフの法則に基づいて種々の換算処理及び補正処理を施して温度が算出される。
例えば、重畳光検出手段の出力から放射光検出手段の出力を差し引いて得られた赤外線強度から被測定物の反射率を求め、キルヒホッフの法則に基づいて反射率から放射率を求め、異なる波長領域で放射率が明確に異なる非灰色体等の被測定物に対して放射率の補正値を求め、算出された放射率又は補正された放射率に基づいて被測定物の温度を算出する。このように、反射率→放射率→温度を算出するため、波長領域によって放射率が変化する非灰色体等の被測定物においても高精度に温度を測定することができる。
また、温度を算出するに至る過程では、異なる複数の波長領域での赤外線強度を測定し、測定された複数の赤外線強度の比に基づいて温度を算出するため、経時変化等による影響を受けることなく高精度に温度を測定することができる。
さらに、赤外光源は、放射光検出手段検出及び重畳光検出手段を取り囲むように形成されているため、赤外光源と放射光検出手段及び重畳光検出手段の位置関係を従来のスポット光源の如く高精度に位置決めする必要はなく、被測定物の面粗度及び反射率が悪くても鏡面反射光と拡散反射光を区別無く受光できるため、被測定物の測定表面が平面のみならず凸凹状の面であっても、高精度に温度を測定することができる。
The radiation temperature measuring device of the present invention includes an infrared light source that irradiates infrared light including a plurality of different wavelength regions to the object to be measured, and a plurality of light beams emitted from the object to be measured with the infrared light source turned off. Synchrotron radiation detection means that detects infrared intensity in different wavelength regions, and infrared intensity in multiple different wavelength regions in the superimposed light of the emitted light and reflected light from the measured object with the infrared light source turned on And a calculation means for calculating the temperature of the object to be measured based on the detection information of the radiation light detection means and the superimposed light detection means, and the infrared light source is provided from the measurement surface side of the object to be measured. As a result, it is configured to surround the radiated light detecting means and the superimposed light detecting means.
According to this configuration, the emitted light detection means detects the infrared intensity in a plurality of different wavelength regions in the emitted light from the object to be measured with the infrared light source turned off, and the superimposed light detection means With the infrared light source turned on, infrared intensities in a plurality of different wavelength regions in the superimposed light of the emitted light and the reflected light from the object to be measured are detected. Then, the calculation means performs various conversion processes and correction processes based on Planck's law and Kirchhoff's law to calculate the temperature.
For example, the reflectance of the object to be measured is obtained from the infrared intensity obtained by subtracting the output of the emitted light detecting means from the output of the superimposed light detecting means, the emissivity is obtained from the reflectance based on Kirchhoff's law, and different wavelength regions Then, a correction value of the emissivity is obtained for a non-grey object to be measured with a clearly different emissivity, and the temperature of the object to be measured is calculated based on the calculated emissivity or the corrected emissivity. Thus, since reflectance → emissivity → temperature is calculated, temperature can be measured with high accuracy even in an object to be measured such as a non-gray body whose emissivity varies depending on the wavelength region.
Also, in the process of calculating the temperature, the infrared intensity in different wavelength regions is measured, and the temperature is calculated based on the ratio of the measured infrared intensity. Temperature can be measured with high accuracy.
Furthermore, since the infrared light source is formed so as to surround the detection of the emitted light detection means and the superimposed light detection means, the positional relationship between the infrared light source, the emission light detection means, and the superimposed light detection means is similar to that of a conventional spot light source. It is not necessary to position with high accuracy, and even if the surface roughness and reflectivity of the object to be measured are poor, specular reflection light and diffuse reflection light can be received without distinction, so the measurement surface of the object to be measured is not only flat but also uneven. Even on this surface, the temperature can be measured with high accuracy.

上記構成において、放射光検出手段は、所定の第1波長領域の赤外線を受光して検出する第1赤外線センサと、第1波長領域とは異なる所定の第2波長領域の赤外線を受光して検出する第2赤外線センサを含み、重畳光検出手段は、上記第1波長領域の赤外線を受光して検出する第1赤外線センサと、上記第2波長領域の赤外線を受光して検出する第2赤外線センサを含む、構成を採用することができる。
この構成によれば、放射光検出手段及び重畳光検出手段は、それぞれ二組の赤外線センサにより形成されて、それぞれ二つの波長領域での赤外線強度を検出するため、温度を高精度に測定しつつも、装置を簡素化することができる。
In the above configuration, the radiant light detection means receives and detects the first infrared sensor that receives and detects infrared light in a predetermined first wavelength region, and the infrared light in a predetermined second wavelength region that is different from the first wavelength region. A first infrared sensor that receives and detects infrared light in the first wavelength region, and a second infrared sensor that receives and detects infrared light in the second wavelength region. It is possible to adopt a configuration including:
According to this configuration, the radiated light detection means and the superimposed light detection means are formed by two sets of infrared sensors, respectively, and detect the infrared intensity in two wavelength regions, respectively, so that the temperature is measured with high accuracy. Also, the apparatus can be simplified.

上記構成において、第1赤外線センサは、第1波長領域の赤外線を通す第1フィルタと、第1フィルタを通過した赤外線を受光する第1受光素子を含み、第2赤外線センサは、第2波長領域の赤外線を通す第2フィルタと、第2フィルタを通過した赤外線を受光する第2受光素子を含む、構成を採用することができる。
この構成によれば、放射光検出手段及び重畳光検出手段の第1赤外線センサ及び第2赤外線センサは、それぞれフィルタ及び受光素子により形成されているため、温度を高精度に測定しつつも、構造の簡素化、装置の小型化を達成することができる。
In the above configuration, the first infrared sensor includes a first filter that transmits infrared light in the first wavelength region and a first light receiving element that receives infrared light that has passed through the first filter, and the second infrared sensor is in the second wavelength region. It is possible to adopt a configuration including a second filter that passes infrared rays and a second light receiving element that receives infrared rays that have passed through the second filter.
According to this configuration, since the first infrared sensor and the second infrared sensor of the emitted light detection means and the superimposed light detection means are formed by the filter and the light receiving element, respectively, the structure is measured while measuring the temperature with high accuracy. Simplification and downsizing of the apparatus can be achieved.

上記構成において、放射光検出手段の第1赤外線センサ及び第2赤外線センサは、重畳光検出手段の第1赤外線センサ及び第2赤外線センサをそれぞれ兼ねる、構成を採用することができる。
この構成によれば、放射光検出手段及び重畳光検出手段が二つの赤外線センサを兼用するため、それぞれに二つの赤外線センサを設ける必要がなく、赤外光源をオン/オフして、二つの赤外線センサ(第1フィルタ及び第1受光素子、第2フィルタ及び第2受光素子)だけで、放射光の赤外線強度と重畳光(放射光及び反射光)の赤外線強度を測定することができる。これにより、部品点数を削減でき、装置をより簡素化、小型化することができる。
In the above-described configuration, the first infrared sensor and the second infrared sensor of the radiated light detection unit may employ a configuration that also serves as the first infrared sensor and the second infrared sensor of the superimposed light detection unit, respectively.
According to this configuration, since the emitted light detection means and the superimposed light detection means also serve as two infrared sensors, there is no need to provide two infrared sensors for each, and the infrared light source is turned on / off, Only the sensors (the first filter and the first light receiving element, the second filter and the second light receiving element) can measure the infrared intensity of the emitted light and the infrared intensity of the superimposed light (the emitted light and the reflected light). Thereby, the number of parts can be reduced, and the apparatus can be further simplified and downsized.

上記構成において、赤外光源は、環状に連続して形成された発熱体又は環状に離散的に複数配列された発光ダイオードからなる、構成を採用することができる。
この構成によれば、赤外光源として、発熱体又は発光ダイオードを用いるため、既存の発熱体を環状に成型し、又は既存の発光ダイオードを複数配列するだけで、赤外光源を容易に形成することができる。
In the above configuration, the infrared light source can employ a configuration including a heating element formed continuously in a ring shape or a plurality of light emitting diodes arranged in a ring shape in a discrete manner.
According to this configuration, since the heating element or the light emitting diode is used as the infrared light source, the infrared light source can be easily formed by simply forming the existing heating element in a ring shape or arranging a plurality of existing light emitting diodes. be able to.

上記構成において、放射光検出手段及び重畳光検出手段は、赤外光源の中心と略同軸に軸心をもつ筒状部材の内側に配置され、筒状部材には、放射光検出手段及び重畳光検出手段よりも被測定物側寄りにおいて窓又はレンズが配置され、筒状部材の外側には、赤外光源から発せられる赤外光線を被測定物に向けて反射するリフレクタが配置されている、構成を採用することができる。
この構成によれば、被測定物から放射された放射光及び被測定物から放射及び反射された重畳光(放射光及び反射光)は、窓又はレンズから筒状部材の内部に進入し、放射光検出手段及び重畳光検出手段によりそれぞれ検出される。
ここで、赤外光源から環状に発せられた赤外線は、直接又はリフレクタにより反射されて被測定物の測定表面に照射され、その照射光は測定表面により反射されて赤外光源の中心領域に配置された窓又はレンズから放射光検出手段及び重畳光検出手段に向けてそれぞれ進入する。したがって、被測定物により反射された鏡面反射光及び拡散反射光が区別無く受光され、又、筒状部材により窓又はレンズを通らない赤外線が検出されるのを防止でき、より高精度に温度測定を行うことができる。
In the above configuration, the emitted light detection means and the superimposed light detection means are disposed inside a cylindrical member having an axial center substantially coaxial with the center of the infrared light source. A window or a lens is disposed closer to the object to be measured than the detection means, and a reflector that reflects infrared light emitted from an infrared light source toward the object to be measured is disposed outside the cylindrical member. A configuration can be employed.
According to this configuration, the radiated light radiated from the object to be measured and the superimposed light (radiated light and reflected light) radiated and reflected from the object to be measured enter the inside of the cylindrical member from the window or lens and radiate. It is detected by the light detection means and the superimposed light detection means, respectively.
Here, the infrared light emitted from the infrared light source in a ring shape is reflected directly or by a reflector and applied to the measurement surface of the object to be measured, and the irradiated light is reflected by the measurement surface and arranged in the central region of the infrared light source. The light enters from the window or lens toward the emitted light detection means and the superimposed light detection means. Therefore, specular reflection light and diffuse reflection light reflected by the object to be measured are received without distinction, and infrared rays that do not pass through the window or lens can be prevented from being detected by the cylindrical member, and the temperature can be measured with higher accuracy. It can be performed.

上記構成において、リフレクタ及び赤外光源は、筒状部材の軸心方向における位置を調整可能に形成されている、構成を採用することができる。
この構成によれば、被測定物(の測定表面)に対して、赤外光源及びリフレクタの離隔距離を調整できるため、赤外光源から発せられる赤外線の照射範囲(立体角)を必要に応じて適宜調整することができる。
In the above configuration, the configuration in which the reflector and the infrared light source are formed so that the position of the cylindrical member in the axial direction can be adjusted can be employed.
According to this configuration, since the separation distance between the infrared light source and the reflector can be adjusted with respect to the object to be measured (the measurement surface), the irradiation range (solid angle) of the infrared light emitted from the infrared light source can be adjusted as necessary. It can be adjusted appropriately.

上記構成において、筒状部材とリフレクタの間には、断熱部材が介在されている、構成を採用することができる。
この構成によれば、断熱部材が、赤外光源が発する赤外線の放射エネルギがリフレクタから筒状部材に伝わるのを防止するため、放射光検出手段及び重畳光検出手段が受光作用以外に受ける熱の影響を防止でき、温度を高精度に検出することができる。
The said structure WHEREIN: The structure by which the heat insulation member is interposed between the cylindrical member and the reflector is employable.
According to this configuration, the heat insulating member prevents the infrared radiation energy emitted from the infrared light source from being transmitted from the reflector to the cylindrical member. The influence can be prevented and the temperature can be detected with high accuracy.

上記構成をなす放射温度測定装置によれば、被測定物が黒体、灰色体、非灰色体のいずれであっても、その被測定物の放射率を予め設定する必要がなく、被測定物の測定表面が平面又は凸凹状のいずれであっても、又、経時変化等による影響を受けることなく、被測定物の温度を非接触にて高精度に測定できる放射温度測定装置を得ることができる。   According to the radiation temperature measuring apparatus having the above configuration, it is not necessary to set the emissivity of the measured object in advance, regardless of whether the measured object is a black body, a gray body, or a non-gray body. It is possible to obtain a radiation temperature measuring device capable of measuring the temperature of an object to be measured with high accuracy in a non-contact manner, regardless of whether the measurement surface is flat or uneven, and without being affected by changes over time. it can.

以下、本発明の最良の実施形態について、添付図面を参照しつつ説明する。
図1ないし図4は、本発明に係る放射温度測定装置をガス調理装置に適用した一実施形態を示すものであり、図1はガス調理装置の概略構成図、図2は放射温度測定装置の概略構成を示す縦断面図、図3は放射温度測定装置の一部を示す横断面図、図4は放射温度測定装置の一部をなす演算回路を示すブロック図である。
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 4 show an embodiment in which a radiation temperature measuring device according to the present invention is applied to a gas cooking device, FIG. 1 is a schematic configuration diagram of the gas cooking device, and FIG. 2 is a diagram of the radiation temperature measuring device. FIG. 3 is a transverse sectional view showing a part of the radiation temperature measuring device, and FIG. 4 is a block diagram showing an arithmetic circuit forming a part of the radiation temperature measuring device.

このガス調理装置は、図1に示すように、平面状に形成されると共に円形に開けられた加熱口1aを画定する天板1、天板1の上面に配置され鍋等の被測定物Wを載置できる五徳2、加熱口1aを通して上方に燃焼ガスを噴出させるべく環状に形成されたバーナ3、バーナ3に燃料ガスと空気を混合して供給する供給管4、供給管4の上流側に設けられたガスノズル5、ガスノズル5に供給される燃料ガスの流量を調整する調整弁6、調整弁6を制御してバーナ3の燃焼量を調整する燃焼制御回路7、バーナ3の中央下方領域に配置された放射温度測定装置M、放射温度測定装置Mにより測定された温度を表示する温度表示器8等を備えている。   As shown in FIG. 1, this gas cooking device is formed in a flat shape and defines a heating plate 1a that is opened in a circular shape, and is placed on the top surface of the top plate 1 and a workpiece W such as a pan. The burner 3 formed in an annular shape so that the combustion gas is ejected upward through the heating port 1a, the supply pipe 4 for supplying the burner 3 with fuel gas and air mixed therein, the upstream side of the supply pipe 4 The gas nozzle 5 provided in the control valve 6, the adjusting valve 6 for adjusting the flow rate of the fuel gas supplied to the gas nozzle 5, the combustion control circuit 7 for adjusting the combustion amount of the burner 3 by controlling the adjusting valve 6, and the central lower region of the burner 3 And a temperature indicator 8 for displaying the temperature measured by the radiation temperature measuring device M, and the like.

バーナ3は、ブンゼン燃焼式の内炎式バーナであり、図1に示すように、放射温度測定装置Mを内側に配置できる空間を確保して環状に形成されたケーシング3a、ケーシング3aの内側に向けて燃焼ガスを噴出させるべく内側壁面に沿って形成された複数の炎口3b等を備えている。   The burner 3 is a Bunsen combustion type internal flame type burner. As shown in FIG. 1, a casing 3 a formed in an annular shape with a space in which the radiation temperature measuring device M can be disposed inside is provided inside the casing 3 a. A plurality of flame outlets 3b and the like formed along the inner wall surface are provided so as to eject the combustion gas toward the same.

放射温度測定装置Mは、図2ないし図4に示すように、被測定物W(の測定表面Ws)に対して複数の異なる波長領域を含む赤外線を照射する赤外光源10、赤外光源10の背後に配置されたリフレクタ20、放射光検出手段及び重畳光検出手段として機能する第1赤外線センサ30及び第2赤外線センサ40、第1赤外線センサ30及び第2赤外線センサ40を内側に収容する筒状部材50、筒状部材50とリフレクタ20の間に介在するように配置された筒状の断熱部材60、筒状部材50の上端に配置された窓70、第1赤外線センサ30及び第2赤外線センサ40の出力信号を用いて種々の演算処理を行う演算手段としての演算制御回路80、演算制御回路80を搭載する回路基板90等を備えている。尚、図2においては、説明の便宜上、演算制御回路80を回路基板90から分離した状態で示している。   As shown in FIGS. 2 to 4, the radiation temperature measuring device M includes an infrared light source 10 and an infrared light source 10 that irradiates infrared rays including a plurality of different wavelength regions to the workpiece W (measurement surface Ws). Reflector 20 disposed behind the first infrared sensor 30, first infrared sensor 30 and second infrared sensor 40 functioning as a radiated light detection means and a superimposed light detection means, and a cylinder which accommodates the first infrared sensor 30 and the second infrared sensor 40 inside. Shaped member 50, tubular heat insulating member 60 disposed so as to be interposed between tubular member 50 and reflector 20, window 70 disposed at the upper end of tubular member 50, first infrared sensor 30, and second infrared ray An arithmetic control circuit 80 serving as arithmetic means for performing various arithmetic processes using the output signal of the sensor 40, a circuit board 90 on which the arithmetic control circuit 80 is mounted, and the like are provided. In FIG. 2, for convenience of explanation, the arithmetic control circuit 80 is shown separated from the circuit board 90.

赤外光源10は、図2及び図3に示すように、被測定物Wの測定表面Ws側から観て、円環状に連続して形成された発熱体からなる。すなわち、赤外光源10は、筒状部材50の周りを取り囲むように(第1赤外線センサ30及び第2赤外線センサ40を取り囲むように)形成されている。
ここで、発熱体としては、複数の異なる波長領域を含む赤外線を発するものであれば、ニクロム線やカンタル線等の如き抵抗体、ハロゲンヒータ、カーボンヒータ、セラミックヒータ、白金ヒータ等が適用される。尚、赤外光源10としては、環状に離散的に複数配列した発光ダイオードを採用してもよい。
このように、赤外光源10として、発熱体又は発光ダイオードを採用することにより、上記の如き既存の発熱体を環状に成型し、又は、赤外線を発する既存の発光ダイオードを複数配列するだけで、赤外光源10を容易に形成することができる。
As shown in FIGS. 2 and 3, the infrared light source 10 includes a heating element formed continuously in an annular shape when viewed from the measurement surface Ws side of the workpiece W. That is, the infrared light source 10 is formed so as to surround the cylindrical member 50 (so as to surround the first infrared sensor 30 and the second infrared sensor 40).
Here, as the heating element, a resistor such as a nichrome wire or a Kanthal wire, a halogen heater, a carbon heater, a ceramic heater, a platinum heater, or the like is applied as long as it emits infrared rays including a plurality of different wavelength regions. . In addition, as the infrared light source 10, you may employ | adopt the light emitting diode arranged in multiple numbers discretely in cyclic | annular form.
Thus, by adopting a heating element or a light emitting diode as the infrared light source 10, the existing heating element as described above is formed into a ring shape, or only by arranging a plurality of existing light emitting diodes that emit infrared rays, The infrared light source 10 can be easily formed.

リフレクタ20は、図2及び図3に示すように、外輪郭が環状に形成されると共に、被測定物Wに対向する側において赤外光源10を非接触にて受け入れるべく凹状に形成されて反射面21aを画定する環状溝21、中央領域において筒状部材50及び断熱部材60を嵌合させて結合するための円形の結合孔22等を備えている。
そして、リフレクタ20は、環状の赤外光源10を環状溝21内に非接触にて受け入れた状態で、赤外光源10が発した赤外線を、被測定物W(の測定表面Ws)に向けて反射するようになっている。これにより、赤外光源10が発した赤外線を、有効に利用して被測定物Wに照射することができる。
すなわち、赤外光源10から環状に発せられた赤外線は、直接又はリフレクタ20により反射されて被測定物Wの測定表面Wsに照射され、その照射光は測定表面Wsにより反射されて赤外光源10の中心領域に配置された窓70から第1赤外線センサ30及び第2赤外線センサ40に向けてそれぞれ進入する。したがって、被測定物Wにより反射された鏡面反射光及び拡散反射光が区別無く受光されることになり、より高精度に温度測定を行うことができる。
As shown in FIGS. 2 and 3, the reflector 20 has an outer contour formed in an annular shape and is formed in a concave shape so as to receive the infrared light source 10 in a non-contact manner on the side facing the object W to be measured. An annular groove 21 that defines the surface 21a, a circular coupling hole 22 for fitting and coupling the tubular member 50 and the heat insulating member 60 in the central region, and the like are provided.
The reflector 20 directs the infrared ray emitted from the infrared light source 10 toward the object to be measured W (measurement surface Ws) in a state where the annular infrared light source 10 is received in the annular groove 21 in a non-contact manner. It is designed to reflect. Thereby, the to-be-measured object W can be irradiated using the infrared rays emitted from the infrared light source 10 effectively.
That is, the infrared light emitted from the infrared light source 10 in a ring shape is reflected directly or reflected by the reflector 20 and applied to the measurement surface Ws of the object W to be measured, and the irradiated light is reflected by the measurement surface Ws and reflected by the infrared light source 10. Enters the first infrared sensor 30 and the second infrared sensor 40 from the window 70 arranged in the central region of the first infrared sensor 30 and the second infrared sensor 40, respectively. Therefore, the specular reflection light and the diffuse reflection light reflected by the object to be measured W are received without distinction, and the temperature measurement can be performed with higher accuracy.

第1赤外線センサ30は、図2に示すように、所定の第1波長領域λ1の赤外線を通す第1フィルタ31、第1フィルタ31を通過した赤外線を受光する第1受光素子32を備えている。このように、第1赤外線センサ30は、第1フィルタ31及び第1受光素子32により形成されているため、温度を高精度に測定しつつも、構造の簡素化、装置の小型化を達成することができる。
第2赤外線センサ40は、図2に示すように、第1波長領域λ1とは異なる所定の第2波長領域λ2の赤外線を通す第2フィルタ41、第2フィルタ41を通過した赤外線を受光する第2受光素子42を備えている。このように、第2赤外線センサ40は、第2フィルタ41及び第2受光素子42により形成されているため、温度を高精度に測定しつつも、構造の簡素化、装置の小型化を達成することができる。
As shown in FIG. 2, the first infrared sensor 30 includes a first filter 31 that passes infrared rays in a predetermined first wavelength region λ <b> 1 and a first light receiving element 32 that receives infrared rays that have passed through the first filter 31. . Thus, since the first infrared sensor 30 is formed by the first filter 31 and the first light receiving element 32, the structure is simplified and the apparatus is reduced in size while measuring the temperature with high accuracy. be able to.
As shown in FIG. 2, the second infrared sensor 40 receives a second filter 41 that passes infrared rays in a predetermined second wavelength region λ2 different from the first wavelength region λ1, and receives infrared rays that have passed through the second filter 41. Two light receiving elements 42 are provided. Thus, since the second infrared sensor 40 is formed by the second filter 41 and the second light receiving element 42, the structure is simplified and the apparatus is miniaturized while measuring the temperature with high accuracy. be able to.

そして、第1赤外線センサ30及び第2赤外線センサ40は、赤外光源10をオフにした状態で、被測定物Wから放射される放射光L1における複数の異なる波長領域(ここでは、波長領域λ1と波長領域λ2)での赤外線強度を検出する放射光検出手段として機能するようになっている。
また、第1赤外線センサ30及び第2赤外線センサ40は、赤外光源10をオンにした状態で、被測定物Wから放射される放射光L1及び反射される反射光L2が重なり合った重畳光における複数の異なる波長領域(ここでは、波長領域λ1と波長領域λ2)での赤外線強度を検出する重畳光検出手段として機能するようになっている。
The first infrared sensor 30 and the second infrared sensor 40 have a plurality of different wavelength regions (here, the wavelength region λ1) in the radiated light L1 emitted from the object W to be measured with the infrared light source 10 turned off. And function as a radiation detecting means for detecting the infrared intensity in the wavelength region λ2).
Further, the first infrared sensor 30 and the second infrared sensor 40 are in the superimposed light in which the radiated light L1 emitted from the object to be measured W and the reflected light L2 reflected are overlapped with the infrared light source 10 turned on. It functions as a superimposed light detecting means for detecting infrared intensity in a plurality of different wavelength regions (here, wavelength region λ1 and wavelength region λ2).

これによれば、第1赤外線センサ30及び第2赤外線センサ40が、放射光検出手段の機能と重畳光検出手段の機能を兼ねるため、それぞれに二つの赤外線センサを設ける必要はなく、赤外光源10をオン/オフして、二つの赤外線センサ30,40(第1フィルタ31及び第1受光素子32、第2フィルタ41及び第2受光素子42)だけで、放射光L1の赤外線強度と重畳光(放射光L1及び反射光L2)の赤外線強度を測定することができる。これにより、部品点数を削減でき、装置をより簡素化、小型化することができる。   According to this, since the first infrared sensor 30 and the second infrared sensor 40 serve both as the function of the radiated light detection means and the function of the superimposed light detection means, it is not necessary to provide two infrared sensors for each of them. 10 is turned on / off, and the infrared intensity of the radiated light L1 and the superimposed light are obtained only by the two infrared sensors 30 and 40 (the first filter 31 and the first light receiving element 32, the second filter 41 and the second light receiving element 42). The infrared intensity of (radiated light L1 and reflected light L2) can be measured. Thereby, the number of parts can be reduced, and the apparatus can be further simplified and downsized.

筒状部材50は、図2及び図3に示すように、第1赤外線センサ30及び第2赤外線センサ40により赤外線強度を測定するのに影響を及ぼさない耐熱性のある材料を用いて、被測定物Wに対向する方向に伸長する円筒状に形成されている。
そして、筒状部材50は、その内側に第1赤外線センサ30及び第2赤外線センサ40を収容し、その上端に(第1赤外線センサ30及び第2赤外線センサ40よりも被測定物W側寄りに)おいて窓70を保持し、その外周面において円筒状の断熱部材60を介してリフレクタ20を保持している。
As shown in FIGS. 2 and 3, the cylindrical member 50 is measured using a heat-resistant material that does not affect the measurement of the infrared intensity by the first infrared sensor 30 and the second infrared sensor 40. It is formed in a cylindrical shape extending in a direction facing the object W.
And the cylindrical member 50 accommodates the 1st infrared sensor 30 and the 2nd infrared sensor 40 in the inner side, and is located near the to-be-measured object W side from the 1st infrared sensor 30 and the 2nd infrared sensor 40 in the upper end. ) And the reflector 20 is held via a cylindrical heat insulating member 60 on the outer peripheral surface thereof.

断熱部材60は、図2及び図3に示すように、円筒状に形成されて、筒状部材50とリフレクタ20の間に固着されている。
そして、断熱部材60は、赤外光源10が発する赤外線の放射エネルギがリフレクタ20から筒状部材50に伝わるのを防止するようになっている。これにより、第1赤外線センサ30及び第2赤外線センサ40が窓70を通して赤外線を受光する以外に、周りから熱の影響を受けるのを防止できる。
As shown in FIGS. 2 and 3, the heat insulating member 60 is formed in a cylindrical shape, and is fixed between the tubular member 50 and the reflector 20.
The heat insulating member 60 prevents the infrared radiation energy emitted from the infrared light source 10 from being transmitted from the reflector 20 to the tubular member 50. Thereby, it can prevent that the 1st infrared sensor 30 and the 2nd infrared sensor 40 receive the influence of a heat from the circumference other than light-receiving infrared rays through the window 70. FIG.

窓70は、第1赤外線センサ30及び第2赤外線センサ40が検出する波長領域を通過させると共に、経時劣化を防止できるガラス材料等により形成され、例えば、ジンクセレン、フッ化バリウム、石英ガラス等の特殊ガラスを採用することができる。
このように、筒状部材50の上端に窓70を設けることにより、筒状部材50の内部に異物等が侵入して、第1赤外線センサ30及び第2赤外線センサ40へ影響を及ぼすのを防止することができる。
The window 70 is formed of a glass material or the like that can pass through the wavelength region detected by the first infrared sensor 30 and the second infrared sensor 40 and can prevent deterioration over time. For example, the window 70 is made of a special material such as zinc selenium, barium fluoride, or quartz glass. Glass can be employed.
Thus, by providing the window 70 at the upper end of the cylindrical member 50, foreign matter or the like enters the cylindrical member 50 and prevents the first infrared sensor 30 and the second infrared sensor 40 from being affected. can do.

すなわち、被測定物Wにより放射された放射光L1は、窓70を通過して筒状部材50の内部空間を進み、第1赤外線センサ30及び第2赤外線センサ40に受光されて検出され、又、被測定物Wにより放射及び反射された重畳光(放射光L+反射光L2)は、同様に、窓70を通過して筒状部材50の内部空間を進み、第1赤外線センサ30及び第2赤外線センサ40に受光されて検出されるようになっている。
したがって、被測定物Wからの放射光L1及び反射光L2(鏡面反射光及び拡散反射光)が受光されると共に、筒状部材50により、窓70を通らない赤外線が検出されるのを防止できるため、より高精度に温度測定を行うことができる。
That is, the radiated light L1 radiated from the object to be measured W passes through the window 70 and travels through the internal space of the cylindrical member 50, and is received and detected by the first infrared sensor 30 and the second infrared sensor 40. Similarly, the superimposed light (radiated light L + reflected light L2) radiated and reflected by the object to be measured W passes through the window 70 and travels through the internal space of the cylindrical member 50, and the first infrared sensor 30 and the second infrared light 30. It is received and detected by the infrared sensor 40.
Accordingly, the radiated light L1 and the reflected light L2 (specular reflection light and diffuse reflection light) from the object to be measured W are received, and it is possible to prevent the cylindrical member 50 from detecting infrared rays that do not pass through the window 70. Therefore, temperature measurement can be performed with higher accuracy.

演算制御回路80は、図4に示すように、種々の演算及び制御を司るCPU81、種々の被測定物Wに関する情報(固有値)及び制御プログラムが予め格納されたROM82、第1赤外線センサ30及び第2赤外線センサ40の検出信号を増幅する増幅回路(AMP)83、増幅回路(AMP)83から出力されるアナログ信号をデジタル値に変換するA/D変換回路84、A/D変換回路84の出力信号を一時的に格納するRAM85、赤外光源10のオン/オフを制御する駆動回路86、押釦やキーボード等により形成される入力回路87、ガス調理装置の制御回路7及び温度表示器8等に信号を出力する出力インタフェース88等を備えている。   As shown in FIG. 4, the arithmetic control circuit 80 includes a CPU 81 that performs various calculations and controls, a ROM 82 in which information (eigenvalues) and control programs related to various objects to be measured W and control programs are stored in advance, the first infrared sensor 30 and the first infrared sensor 30. (2) An amplification circuit (AMP) 83 that amplifies the detection signal of the infrared sensor 40, an A / D conversion circuit 84 that converts an analog signal output from the amplification circuit (AMP) 83 into a digital value, and an output of the A / D conversion circuit 84 A RAM 85 for temporarily storing signals, a drive circuit 86 for controlling on / off of the infrared light source 10, an input circuit 87 formed by a push button, a keyboard, etc., a control circuit 7 for a gas cooking device, a temperature indicator 8 and the like An output interface 88 for outputting signals is provided.

ここで、ROM82に格納される演算処理のための制御プログラムの情報等について説明する。
先ず、プランクの法則によれば、絶対温度をT(K)、放射定数をC,C、波長をλ(μm)、被測定物Wの放射率をεで表すと、波長λの赤外線による赤外線強度(放射エネルギ、分光放射発散度)E(λ)は、次式(1)で表される。
E(λ)=εC[λ−5{exp(C/λT)}−1]−1 ・・・(1)
また、キルヒホッフの法則によれば、被測定物Wの放射率εと反射率Rの関係は、次式(2)で表される。
ε=1−R ・・・(2)
すなわち、被測定物Wの温度を演算により求める際には、上記(1),(2)の式を用いて、所定の換算処理及び補正処理を施すものである。
Here, the information of the control program for arithmetic processing stored in the ROM 82 will be described.
First, according to Planck's law, when the absolute temperature is T (K), the radiation constants are C 1 and C 2 , the wavelength is λ (μm), and the emissivity of the object W to be measured is ε, The infrared intensity (radiant energy, spectral radiation divergence) E (λ) is expressed by the following equation (1).
E (λ) = εC 1−5 {exp (C 2 / λT)} − 1] −1 (1)
Further, according to Kirchhoff's law, the relationship between the emissivity ε and the reflectance R of the workpiece W is expressed by the following equation (2).
ε = 1−R (2)
That is, when the temperature of the workpiece W is obtained by calculation, predetermined conversion processing and correction processing are performed using the equations (1) and (2).

一方、種々の被測定物W(銀色鍋、黒色鍋、ステンレス鍋、銅鍋、有機塗料コーティング鍋、アルマイト処理鍋)における素子出力及び放射率は、図5(a),(b)に示す結果となる。ここで、2つの波長領域λ1,λ2のうち、一方の波長領域は3.6μm〜4.0μmであり、他方の波長領域は9.1μm〜9.7μmである。
すなわち、放射光L1と重畳光(放射光L1+反射光L2)における異なる2つの波長領域(λ1、λ2)での赤外線を、第1赤外線センサ30及び第2赤外線センサ40で受光し、各波長領域における放射光成分を差し引いた反射光成分の出力値(所定の増幅率で増幅した素子出力値)は、図5(a)に示す結果となる。
したがって、赤外光源10から発せられた赤外線強度と反射光の赤外線強度から、種々の被測定物Wの反射率Rに関する情報が得られる。
そこで、キルヒホッフの法則に基づいて、銅鍋の放射率を0.1として、図5(a)に示すデータから所定の換算処理を施して、種々の被測定物Wにおける放射率εを求めると、図5(b)に示す結果となる。
この結果によれば、有機塗料コーティング鍋及びアルマイト処理鍋の被測定物Wに関しては、2つの波長領域(λ1、λ2)において放射率εが大きく変化していることが理解される。
On the other hand, the element output and emissivity in various objects to be measured W (silver pot, black pot, stainless steel pot, copper pot, organic paint coating pot, anodized processing pot) are the results shown in FIGS. 5 (a) and 5 (b). It becomes. Here, of the two wavelength regions λ1 and λ2, one wavelength region is 3.6 μm to 4.0 μm, and the other wavelength region is 9.1 μm to 9.7 μm.
That is, infrared rays in two different wavelength regions (λ1, λ2) in the radiated light L1 and the superimposed light (radiated light L1 + reflected light L2) are received by the first infrared sensor 30 and the second infrared sensor 40, and each wavelength region is received. The output value of the reflected light component obtained by subtracting the radiated light component in (the element output value amplified by a predetermined amplification factor) is the result shown in FIG.
Therefore, information on the reflectance R of various objects to be measured W can be obtained from the infrared intensity emitted from the infrared light source 10 and the infrared intensity of the reflected light.
Therefore, based on Kirchhoff's law, when the emissivity of the copper pan is set to 0.1, a predetermined conversion process is performed from the data shown in FIG. The result shown in FIG. 5B is obtained.
According to this result, it is understood that the emissivity ε greatly changes in the two wavelength regions (λ1, λ2) for the object W to be measured of the organic paint coating pan and the anodized processing pan.

そこで、プランクの法則を適用できるようにするために、これら異なる波長領域(λ1、λ2)において放射率εが変化する被測定物W(有機塗料コーティング鍋、アルマイト処理鍋等)については、非灰色体を灰色体に換算するための所定の補正処理を施し、すなわち、これら有機塗料コーティング鍋及びアルマイト処理鍋の被測定物Wについては、図6(a)に示す出力比−補正値の関係を適用する。
そして、プランクの法則に基づいて、出力比−温度の関係を予め求めておき、実際に得られた出力比から対応する温度Tを読み取り、すなわち、図6(b)に示すように、予め求められた種々の被測定物Wに関する出力比−温度の関係を示すグラフから温度Tを読み取り、その温度Tを測定温度として出力する。
これら図5及び図6に示すデータは、被測定物Wに関する情報として、予めROM82に格納されている。
Therefore, in order to be able to apply Planck's law, the object to be measured W (organic paint coating pan, anodized processing pan, etc.) whose emissivity ε changes in these different wavelength regions (λ1, λ2) is non-gray. A predetermined correction process for converting the body into a gray body is performed. That is, for the measured object W of the organic paint coating pan and the anodized processing pan, the relationship of output ratio-correction value shown in FIG. Apply.
Then, based on Planck's law, the relationship between the output ratio and the temperature is obtained in advance, and the corresponding temperature T is read from the actually obtained output ratio, that is, obtained in advance as shown in FIG. The temperature T is read from the graph showing the relationship between the output ratio and the temperature for the various measured objects W, and the temperature T is output as the measurement temperature.
The data shown in FIGS. 5 and 6 are stored in advance in the ROM 82 as information about the workpiece W.

すなわち、演算制御回路80においては、第1赤外線センサ30及び第2赤外線センサ40により、赤外光源10をオフにした状態において、被測定物Wからの放射光L1における異なる2つの波長領域(λ1、λ2)での赤外線強度(E(λ1),E(λ2))が検出され、又、赤外光源10をオンにした状態において、被測定物Wからの放射光L1及び反射光L2の重畳光における異なる2つの波長領域(λ1、λ2)での赤外線強度(E(λ1),E(λ2))が検出される。
ここで、赤外光源10のオン/オフは、駆動回路86から出力される切替信号に基づいて制御される。温度測定時には、赤外光源10を所定のタイミングでオン/オフして、放射光L1だけの場合、放射光L1及び反射光L2の重畳光の場合において、交互に温度測定が行われる。
That is, in the arithmetic control circuit 80, two different wavelength regions (λ1) in the radiated light L1 from the object W to be measured in the state where the infrared light source 10 is turned off by the first infrared sensor 30 and the second infrared sensor 40. , Λ2), the infrared light intensity (E (λ1), E (λ2)) is detected, and the radiation light L1 and the reflected light L2 from the object to be measured W are superimposed in a state where the infrared light source 10 is turned on. Infrared intensity (E (λ1), E (λ2)) in two different wavelength regions (λ1, λ2) in the light is detected.
Here, on / off of the infrared light source 10 is controlled based on a switching signal output from the drive circuit 86. At the time of temperature measurement, the infrared light source 10 is turned on / off at a predetermined timing, and in the case of only the radiated light L1, the temperature measurement is alternately performed in the case of the superimposed light of the radiated light L1 and the reflected light L2.

そして、重畳光(放射光L1+反射光L2)による出力値から放射光L1だけによる出力値を差し引いて得られた赤外線強度に基づいて被測定物Wの反射率Rを求め、キルヒホッフの法則に基づいて反射率Rから放射率εを求め、異なる2つの波長領域(λ1、λ2)で放射率εが明確に(大きく)異なる非灰色体等の被測定物Wについては、放射率εの補正値を求め、灰色体の被測定物Wの場合に算出された放射率εに基づいて、又、非灰色体の被測定物Wの場合に補正された放射率εに基づいて、それぞれ被測定物Wの温度Tが算出される。   Then, the reflectance R of the object to be measured W is obtained based on the infrared intensity obtained by subtracting the output value of only the radiated light L1 from the output value of the superimposed light (radiated light L1 + reflected light L2), and based on Kirchhoff's law. The emissivity ε is obtained from the reflectivity R, and a correction value for the emissivity ε is obtained for a non-gray object to be measured W such as a non-gray body in which the emissivity ε is clearly (largely) different in two different wavelength regions (λ1, λ2). And the measured object based on the emissivity ε calculated in the case of the gray object to be measured W and the corrected emissivity ε in the case of the non-gray object to be measured W, respectively. A temperature T of W is calculated.

このように、反射率R→放射率ε→温度Tを算出するため、波長領域によって放射率εが変化する非灰色体等の被測定物Wにおいても高精度に温度Tを測定することができる。特に、温度Tを算出するに至る過程では、異なる2つの波長領域(λ1、λ2)での赤外線強度を測定し、測定された複数の赤外線強度の出力比に基づいて温度Tを算出するため、経時変化等による影響を受けることなく高精度に温度Tを測定することができる。   As described above, since the reflectance R → the emissivity ε → the temperature T is calculated, the temperature T can be measured with high accuracy even in the measurement object W such as a non-gray body in which the emissivity ε varies depending on the wavelength region. . In particular, in the process of calculating the temperature T, in order to measure the infrared intensity in two different wavelength regions (λ1, λ2) and calculate the temperature T based on the measured output ratio of the plurality of infrared intensity, The temperature T can be measured with high accuracy without being affected by changes with time.

また、赤外光源10は、第1赤外線センサ30及び第2赤外線センサ40を取り囲むように環状に形成されているため、赤外光源10と第1赤外線センサ30及び第2赤外線センサ40の位置関係を従来のスポット光源の如く高精度に位置決めする必要がなく、被測定物Wの面粗度及び反射率が悪くても鏡面反射光(正反射光)と拡散反射光(乱反射光)を区別無く受光することができる。これにより、被測定物Wの測定表面Wsが平面の場合は勿論のこと、凸凹状の面であっても、高精度に温度Tを測定することができる。   Further, since the infrared light source 10 is formed in an annular shape so as to surround the first infrared sensor 30 and the second infrared sensor 40, the positional relationship between the infrared light source 10, the first infrared sensor 30, and the second infrared sensor 40. Is not required to be positioned with high accuracy as in the case of a conventional spot light source, and even if the surface roughness and reflectance of the object to be measured W are poor, specular reflection light (regular reflection light) and diffuse reflection light (diffuse reflection light) are not distinguished. It can receive light. As a result, the temperature T can be measured with high accuracy even when the measurement surface Ws of the workpiece W is a flat surface, even if it is an uneven surface.

図7(a),(b)は、赤外光源として、環状(リング状)をなす赤外光源10(リング光源)と従来のスポット光源を適用し、被測定物Wの測定表面として、平面をなす塗装鍋と凸凹面をなす雪平鍋を適用した場合について、異なる2つの波長領域(λ1、λ2)で得られた反射光のセンサ出力A,B、センサ出力比(A/B)を示すものである。
この結果によれば、被測定物Wの測定表面Wsが平面の場合は、図7(a)に示すように、いずれの赤外光源であっても測定データのバラツキは小さいが、被測定物Wの測定表面Wsが凸凹面の場合は、図7(b)に示すように、リング状の赤外光源10の方が測定データのバラツキが小さく、高精度に温度を測定できることが理解される。
7A and 7B, an infrared light source 10 (ring light source) having a ring (ring shape) and a conventional spot light source are applied as an infrared light source, and a planar surface is used as a measurement surface of the object W to be measured. The sensor outputs A and B and the sensor output ratio (A / B) of the reflected light obtained in two different wavelength regions (λ1 and λ2) are shown for the case where the paint pan and the snow flat pan having an uneven surface are applied. Is.
According to this result, when the measurement surface Ws of the object to be measured W is flat, as shown in FIG. 7 (a), the measurement data varies little for any infrared light source, but the object to be measured When the measurement surface Ws of W is uneven, as shown in FIG. 7B, it is understood that the ring-shaped infrared light source 10 has less variation in measurement data and can measure temperature with high accuracy. .

上記構成をなす放射温度測定装置によれば、被測定物Wが黒体,灰色体,非灰色体のいずれであっても、その被測定物Wの放射率εを予め求めて設定する必要がなく、又、被測定物Wの測定表面Wsが平面あるいは凹凸面のいずれであっても、さらには、窓70の汚れやその他の構成要素の経時変化等による影響を受けることなく、被測定物Wの温度Tを非接触にて高精度に測定することができる。   According to the radiation temperature measuring apparatus having the above configuration, it is necessary to obtain and set the emissivity ε of the measurement object W in advance, regardless of whether the measurement object W is a black body, a gray body, or a non-gray body. In addition, even if the measurement surface Ws of the object to be measured W is either a flat surface or an uneven surface, the object to be measured is not affected by the contamination of the window 70 or the aging of other components. The temperature T of W can be measured with high accuracy without contact.

図8は、本発明に係る放射温度測定装置の他の実施形態を示すものであり、前述の実施形態と同一の構成については同一の符号を付してその説明を省略する。
すなわち、この実施形態においては、図8に示すように、断熱部材60´は、筒状部材50と同一の軸心Sをもつ円筒状に形成されると共に、筒状部材50の全域を覆うように形成され、その外周面において軸心S方向に配列するように形成された複数の係合溝60a´を備えている。
FIG. 8 shows another embodiment of the radiation temperature measuring apparatus according to the present invention. The same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.
That is, in this embodiment, as shown in FIG. 8, the heat insulating member 60 ′ is formed in a cylindrical shape having the same axis S as the cylindrical member 50 and covers the entire area of the cylindrical member 50. And a plurality of engaging grooves 60a 'formed so as to be arranged in the direction of the axis S on the outer peripheral surface thereof.

また、リフレクタ20´は、断熱部材60´に摺動自在に嵌合される嵌合孔22´、下方に伸長して断熱部材60´の係合溝60a´にスナップフィット結合する係合片23´を備えている。
さらに、赤外光源10は、リフレクタ20´の環状溝21(反射面21a)内に非接触にて配置されると共にリフレクタ20´と一体的に軸心S方向に移動し得るように保持されている。
The reflector 20 'includes a fitting hole 22' that is slidably fitted to the heat insulating member 60 ', and an engagement piece 23 that extends downward and snap-fit to the engagement groove 60a' of the heat insulating member 60 '. 'Is provided.
Further, the infrared light source 10 is disposed in a non-contact manner in the annular groove 21 (reflecting surface 21a) of the reflector 20 'and is held so as to be able to move in the direction of the axis S integrally with the reflector 20'. Yes.

したがって、係合片23´が係合する係合溝60a´を変えるようにリフレクタ20´を軸心S方向に移動させることで、リフレクタ20´及び赤外光源10を、筒状部材50の軸心S方向の所望の位置に調整できるようになっている。
これによれば、被測定物W(の測定表面Ws)に対して、赤外光源10及びリフレクタ20´の離隔距離を調整できるため、赤外光源10から発せられる赤外線の照射範囲(立体角)を必要に応じて適宜調整することができる。
Therefore, the reflector 20 ′ and the infrared light source 10 are moved to the axis of the cylindrical member 50 by moving the reflector 20 ′ in the axis S direction so as to change the engagement groove 60 a ′ with which the engagement piece 23 ′ is engaged. It can be adjusted to a desired position in the direction of the center S.
According to this, since the separation distance between the infrared light source 10 and the reflector 20 ′ can be adjusted with respect to the object to be measured W (the measurement surface Ws), the irradiation range (solid angle) of the infrared light emitted from the infrared light source 10 is adjustable. Can be adjusted as needed.

図9は、本発明に係る放射温度測定装置のさらに他の実施形態を示すものであり、前述の実施形態と同一の構成については同一の符号を付してその説明を省略する。
すなわち、この実施形態においては、図9に示すように、リフレクタ20´´が、赤外光源10を覆うようにかつ径方向外側領域が被測定物Wに向けて環状に開口するように形成されている。
FIG. 9 shows still another embodiment of the radiation temperature measuring apparatus according to the present invention. The same components as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.
In other words, in this embodiment, as shown in FIG. 9, the reflector 20 ″ is formed so as to cover the infrared light source 10 and the radially outer region opens in an annular shape toward the object W to be measured. ing.

したがって、赤外光源10が発した赤外線は、直接被測定物Wに照射されるのではなくて、リフレクタ20´´により反射された赤外線のみが被測定物Wに照射されるようになっている。
これによれば、リフレクタ20´´を適宜所望の形状にすることにより、赤外光源10から発せられた赤外線が被測定物Wに照射される照射範囲を適宜調整、例えば、赤外光源10の中心寄りに方向付けすることができる。
Accordingly, the infrared light emitted from the infrared light source 10 is not directly applied to the object to be measured W, but only the infrared light reflected by the reflector 20 ″ is applied to the object to be measured W. .
According to this, by appropriately making the reflector 20 ″ into a desired shape, the irradiation range in which the infrared ray emitted from the infrared light source 10 is irradiated onto the object W to be measured is appropriately adjusted, for example, the infrared light source 10 It can be oriented towards the center.

図10は、本発明に係る放射温度測定装置のさらに他の実施形態を示すものであり、携帯型の装置として形成されている。尚、前述の実施形態と同一の構成については同一の符号を付してその説明を省略する。
この放射温度測定装置M´は、操作者が指で掴むボデー100、ボデー100に対して軸心S方向に可動に形成された可動ボデー110、ボデー100に設けられた操作釦101、ボデー100の内部に設けられた第1赤外線センサ30及び第2赤外線センサ40、ボデー100に設けられると共に第1赤外線センサ30及び第2赤外線センサ40を収容する円筒状の筒状部材50、筒状部材50の先端に設けられたレンズ70´、筒状部材50の外周に設けられた円筒状の断熱部材60´、可動ボデー110の先端に設けられたリフレクタ20´、リフレクタ20´の環状溝21内に露出するようにかつ環状に離散的に配列された複数の発光ダイオードからなる赤外光源10´等を備えている。
FIG. 10 shows still another embodiment of the radiation temperature measuring device according to the present invention, which is formed as a portable device. In addition, about the structure same as the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
The radiation temperature measuring device M ′ includes a body 100 that an operator holds with a finger, a movable body 110 that is movable with respect to the body 100 in the direction of the axis S, an operation button 101 provided on the body 100, First and second infrared sensors 30 and 40 provided in the interior of the cylindrical member 50 and cylindrical member 50 provided in the body 100 and accommodating the first and second infrared sensors 30 and 40. A lens 70 ′ provided at the tip, a cylindrical heat insulating member 60 ′ provided at the outer periphery of the cylindrical member 50, a reflector 20 ′ provided at the tip of the movable body 110, and the annular groove 21 of the reflector 20 ′ are exposed. In addition, an infrared light source 10 'composed of a plurality of light emitting diodes arranged discretely in a ring shape is provided.

この放射温度測定装置M´によれば、操作者がボデー100を指で掴んで、温度を測定したい種々の被測定物Wの測定表面Wsに向けて、所定操作を行って温度を測定することができる。
この場合も、被測定物Wが黒体,灰色体,非灰色体のいずれであっても、その被測定物Wの放射率εを予め求めて設定する必要がなく、又、被測定物Wの測定表面Wsが平面あるいは凹凸面のいずれであっても、さらには、構成要素の経時変化等による影響を受けることなく、被測定物Wの温度Tを非接触にて容易にかつ高精度に測定することができる。
According to this radiation temperature measuring apparatus M ′, the operator grasps the body 100 with a finger and measures the temperature by performing a predetermined operation toward the measurement surface Ws of various objects W to be measured. Can do.
Also in this case, it is not necessary to obtain and set the emissivity ε of the measurement object W in advance, regardless of whether the measurement object W is a black body, a gray body, or a non-gray body. Even if the measurement surface Ws is flat or uneven, the temperature T of the measurement object W can be easily and accurately adjusted in a non-contact manner without being affected by changes in the components over time. Can be measured.

上記実施形態においては、赤外光源10,10´が環状に形成された発熱体又は環状に配列された複数の発光ダイオードからなるものを示したが、これに限定されるものではなく、赤外光線をスポット的にではなく環状に発するものであれば、その他の赤外光源を採用してもよい。
上記実施形態においては、放射光検出手段及び重畳光検出手段として、共通の赤外線センサ30,40を適用したが、これに限定されるものではなく、別々に専用の赤外線センサを採用してもよい。
上記実施形態においては、放射温度測定装置を適用したものとして、ガス調理装置を示したが、これに限定されるものではなく、温度測定を要するその他の機器に組み込まれてもよい。
In the above-described embodiment, the infrared light source 10, 10 'is composed of a heating element formed in a ring shape or a plurality of light emitting diodes arranged in a ring shape. However, the present invention is not limited to this. Other infrared light sources may be employed as long as they emit light in a ring shape instead of a spot.
In the above embodiment, the common infrared sensors 30 and 40 are applied as the emitted light detection means and the superimposed light detection means. However, the present invention is not limited to this, and dedicated infrared sensors may be employed separately. .
In the said embodiment, although the gas cooking apparatus was shown as what applied the radiation temperature measuring apparatus, it is not limited to this, You may incorporate in the other apparatus which requires temperature measurement.

以上述べたように、本発明の放射温度測定装置は、被測定物が黒体、灰色体、非灰色体のいずれであっても、その被測定物の放射率を予め設定する必要がなく、被測定物の測定表面が平面又は凸凹状のいずれであっても、又、経時変化等による影響を受けることなく、被測定物の温度を非接触にて高精度に測定できるため、ガス調理装置や電気調理装置に適用されるのは勿論のこと、温度測定を要する機械加工分野あるいは製鉄分野等においても有用である。   As described above, the radiation temperature measuring device of the present invention does not need to set the emissivity of the measurement object in advance, regardless of whether the measurement object is a black body, a gray body, or a non-gray body. Even if the measurement surface of the object to be measured is either flat or uneven, the gas cooking device can measure the temperature of the object to be measured with high accuracy in a non-contact manner without being affected by changes over time, etc. It is useful not only in the field of machining and iron making, but also in the field of machining requiring temperature measurement.

本発明に係る放射温度測定装置を適用したガス調理装置の一実施形態を示す概略構成図である。It is a schematic structure figure showing one embodiment of a gas cooking device to which a radiation temperature measuring device concerning the present invention is applied. 図1に示す放射温度測定装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the radiation temperature measuring apparatus shown in FIG. 図2中のE1−E1における横断面図である。It is a cross-sectional view in E1-E1 in FIG. 図1に示す放射温度想定装置の一部をなす演算制御回路を示すブロック図である。It is a block diagram which shows the calculation control circuit which makes a part of radiation temperature assumption apparatus shown in FIG. (a)は種々の被測定物における素子出力のデータを示す図であり、(b)は種々の被測定物における放射率を示す図である。(A) is a figure which shows the data of the element output in various to-be-measured objects, (b) is a figure which shows the emissivity in various to-be-measured objects. (a)は種々の被測定物における出力比−補正値の関係を示す図であり、(b)は種々の被測定物における出力比−温度の関係を示す図である。(A) is a figure which shows the relationship of output ratio-correction value in various to-be-measured objects, (b) is a figure which shows the relationship of output ratio-temperature in various to-be-measured objects. 環状の赤外光源(リング光源)とスポット光源における反射光のセンサ出力及びその比を示すものであり、(a)は測定表面が平面をなす塗装鍋を測定した場合の反射光のセンサ出力及びその比を示す図であり、(b)は測定表面が凸凹面をなす雪平鍋を測定した場合の反射光のセンサ出力及びその比を示す図である。The sensor output of the reflected light in a ring infrared light source (ring light source) and a spot light source and its ratio are shown, (a) is the sensor output of the reflected light when measuring the coating pan whose measurement surface forms a plane, and It is a figure which shows the ratio, (b) is a figure which shows the sensor output of reflected light at the time of measuring the snow pan with which the measurement surface makes an uneven surface, and its ratio. 本発明に係る放射温度測定装置の他の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows other embodiment of the radiation temperature measuring apparatus which concerns on this invention. 本発明に係る放射温度測定装置のさらに他の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows other embodiment of the radiation temperature measuring apparatus which concerns on this invention. 本発明に係る放射温度測定装置を携帯型にした場合の実施形態を示す外観斜視図である。It is an appearance perspective view showing an embodiment at the time of making a radiation temperature measuring device concerning the present invention portable. 種々の被測定物における波長と放射率の関係を示す図である。It is a figure which shows the relationship between the wavelength and emissivity in various to-be-measured objects.

符号の説明Explanation of symbols

1 天板
1a 加熱口
2 五徳
3 バーナ
3a ケーシング
3b 炎口
4 供給管
5 ガスノズル
6 調整弁
7 燃焼制御回路
8 温度表示器
10,10´ 赤外光源
20,20´,20´´ リフレクタ
21 環状溝
21a 反射面
22 結合孔
22´ 嵌合孔
23´ 係合片
30 第1赤外線センサ(放射光検出手段、重畳光検出手段)
31 第1フィルタ
32 第1受光素子
40 第2赤外線センサ(放射光検出手段、重畳光検出手段)
41 第2フィルタ
42 第2受光素子
50 筒状部材
60,60´ 断熱部材
60a´ 係合溝
70 窓
70´ レンズ
80 演算制御回路(演算手段)
81 CPU
82 ROM
83 AMP(増幅回路)
84 A/D変換回路
85 RAM
86 駆動回路
87 入力回路
88 出力インタフェース
90 回路基板
100 ボデー
101 操作釦
110 可動ボデー
M,M´ 放射温度測定装置
S 軸心
L1 放射光
L2 反射光
DESCRIPTION OF SYMBOLS 1 Top plate 1a Heating port 2 Gotoku 3 Burner 3a Casing 3b Flame port 4 Supply pipe 5 Gas nozzle 6 Control valve 7 Combustion control circuit 8 Temperature indicator 10, 10 'Infrared light source 20, 20', 20 "reflector 21 Annular groove 21a Reflecting surface 22 Coupling hole 22 'Fitting hole 23' Engagement piece 30 First infrared sensor (radiated light detection means, superimposed light detection means)
31 First filter 32 First light receiving element 40 Second infrared sensor (radiated light detecting means, superimposed light detecting means)
41 2nd filter 42 2nd light receiving element 50 Cylindrical member 60, 60 'Heat insulation member 60a' Engaging groove 70 Window 70 'Lens 80 Calculation control circuit (calculation means)
81 CPU
82 ROM
83 AMP (amplifier circuit)
84 A / D conversion circuit 85 RAM
86 Drive circuit 87 Input circuit 88 Output interface 90 Circuit board 100 Body 101 Operation button 110 Movable body M, M ′ Radiation temperature measuring device S Axis L1 Radiation light L2 Reflection light

Claims (8)

被測定物に対して複数の異なる波長領域を含む赤外線を照射する赤外光源と、
前記赤外光源をオフにした状態で被測定物からの放射光における複数の異なる波長領域での赤外線強度を検出する放射光検出手段と、
前記赤外光源をオンにした状態で被測定物からの放射光及び反射光の重畳光における複数の異なる波長領域での赤外線強度を検出する重畳光検出手段と、
前記放射光検出手段及び重畳光検出手段の検出情報に基づいて被測定物の温度を演算する演算手段と、を備え、
前記赤外光源は、被測定物の測定表面側から観て、前記放射光検出手段及び重畳光検出手段を取り囲むように形成されている、
ことを特徴とする放射温度測定装置。
An infrared light source that irradiates infrared light including a plurality of different wavelength regions to the object to be measured;
Synchrotron radiation detecting means for detecting infrared intensity in a plurality of different wavelength regions in the radiated light from the object to be measured with the infrared light source turned off;
Superimposed light detection means for detecting infrared intensity in a plurality of different wavelength regions in the superimposed light of the radiated light and reflected light from the object to be measured with the infrared light source turned on;
A calculation means for calculating the temperature of the object to be measured based on the detection information of the emitted light detection means and the superimposed light detection means,
The infrared light source is formed so as to surround the radiated light detection means and the superimposed light detection means as viewed from the measurement surface side of the object to be measured.
A radiation temperature measuring device.
前記放射光検出手段は、所定の第1波長領域の赤外線を受光して検出する第1赤外線センサと、前記第1波長領域とは異なる所定の第2波長領域の赤外線を受光して検出する第2赤外線センサと、を含み、
前記重畳光検出手段は、前記第1波長領域の赤外線を受光して検出する第1赤外線センサと、前記第2波長領域の赤外線を受光して検出する第2赤外線センサと、を含む、
ことを特徴とする請求項1記載の放射温度測定装置。
The radiated light detecting means receives a first infrared sensor that receives and detects infrared rays in a predetermined first wavelength region, and a first infrared sensor that receives and detects infrared rays in a predetermined second wavelength region different from the first wavelength region. 2 infrared sensors,
The superimposed light detection means includes a first infrared sensor that receives and detects infrared rays in the first wavelength region, and a second infrared sensor that receives and detects infrared rays in the second wavelength region,
The radiation temperature measuring apparatus according to claim 1.
前記第1赤外線センサは、前記第1波長領域の赤外線を通す第1フィルタと、前記第1フィルタを通過した赤外線を受光する第1受光素子と、を含み、
前記第2赤外線センサは、前記第2波長領域の赤外線を通す第2フィルタと、前記第2フィルタを通過した赤外線を受光する第2受光素子と、含む、
ことを特徴とする請求項2記載の放射温度測定装置。
The first infrared sensor includes a first filter that transmits infrared light in the first wavelength region, and a first light receiving element that receives infrared light that has passed through the first filter,
The second infrared sensor includes a second filter that transmits infrared light in the second wavelength region, and a second light receiving element that receives infrared light that has passed through the second filter.
The radiation temperature measuring apparatus according to claim 2.
前記放射光検出手段の第1赤外線センサ及び第2赤外線センサは、前記重畳光検出手段の第1赤外線センサ及び第2赤外線センサをそれぞれ兼ねる、
ことを特徴とする請求項2又は3に記載の放射温度測定装置。
The first infrared sensor and the second infrared sensor of the radiated light detecting means also serve as the first infrared sensor and the second infrared sensor of the superimposed light detecting means, respectively.
The radiation temperature measuring device according to claim 2 or 3, wherein
前記赤外光源は、環状に連続して形成された発熱体、又は、環状に離散的に複数配列された発光ダイオードからなる、
ことを特徴とする請求項1ないし4いずれかに記載の放射温度測定装置。
The infrared light source is composed of a heating element formed continuously in a ring shape, or a plurality of light emitting diodes arranged in a ring shape discretely,
The radiation temperature measuring apparatus according to any one of claims 1 to 4, wherein
前記放射光検出手段及び重畳光検出手段は、前記赤外光源の中心と略同軸に軸心をもつ筒状部材の内側に配置され、
前記筒状部材には、前記放射光検出手段及び重畳光検出手段よりも被測定物側寄りにおいて、窓又はレンズが配置され、
前記筒状部材の外側には、前記赤外光源から発せられる赤外光線を被測定物に向けて反射するリフレクタが配置されている、
ことを特徴とする請求項1ないし5いずれかに記載の放射温度測定装置。
The emitted light detection means and the superimposed light detection means are disposed inside a cylindrical member having an axial center substantially coaxial with the center of the infrared light source,
In the cylindrical member, a window or a lens is disposed closer to the object to be measured than the radiated light detection means and the superimposed light detection means,
A reflector that reflects infrared rays emitted from the infrared light source toward the object to be measured is disposed outside the cylindrical member.
The radiation temperature measuring device according to claim 1, wherein
前記リフレクタ及び赤外光源は、前記筒状部材の軸心方向における位置を調整可能に形成されている、
ことを特徴とする請求項6記載の放射温度測定装置。
The reflector and the infrared light source are formed such that the position of the cylindrical member in the axial direction can be adjusted.
The radiation temperature measuring device according to claim 6.
前記筒状部材と前記リフレクタの間には、断熱部材が介在されている、
ことを特徴とする請求項6又は7に記載の放射温度測定装置。

A heat insulating member is interposed between the cylindrical member and the reflector.
The radiation temperature measuring device according to claim 6 or 7, wherein

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
JP2009186147A (en) * 2008-02-08 2009-08-20 Osaka Gas Co Ltd Temperature detector for cooking device
JP2013084403A (en) * 2011-10-07 2013-05-09 Hitachi Appliances Inc Induction heating cooker
KR101750800B1 (en) 2014-10-14 2017-06-26 주식회사 엘지화학 Method and apparatus of temperature measurement without contingence for non-gray body
WO2019053759A1 (en) * 2017-09-12 2019-03-21 株式会社芝浦電子 Infrared temperature sensor
KR20190048705A (en) * 2017-10-31 2019-05-09 주식회사 템퍼스 Apparatus for measuring temperature of glass transmission type and induction range having the same
CN112556856A (en) * 2020-11-16 2021-03-26 烟台艾睿光电科技有限公司 Infrared temperature measurement correction method and device and electronic equipment
CN114018324A (en) * 2021-11-02 2022-02-08 清华大学 Multi-parameter synchronous measurement method and device, electronic equipment and storage medium
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Publication number Priority date Publication date Assignee Title
JP2009186147A (en) * 2008-02-08 2009-08-20 Osaka Gas Co Ltd Temperature detector for cooking device
JP2013084403A (en) * 2011-10-07 2013-05-09 Hitachi Appliances Inc Induction heating cooker
KR101750800B1 (en) 2014-10-14 2017-06-26 주식회사 엘지화학 Method and apparatus of temperature measurement without contingence for non-gray body
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WO2023230102A1 (en) * 2022-05-27 2023-11-30 Basf Corporation Pyrometer electronics design for modern industry protocols

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