JP2018169178A - Dew condensation sensor and dew condensation alarm device using the same - Google Patents

Dew condensation sensor and dew condensation alarm device using the same Download PDF

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JP2018169178A
JP2018169178A JP2017064395A JP2017064395A JP2018169178A JP 2018169178 A JP2018169178 A JP 2018169178A JP 2017064395 A JP2017064395 A JP 2017064395A JP 2017064395 A JP2017064395 A JP 2017064395A JP 2018169178 A JP2018169178 A JP 2018169178A
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dew condensation
light receiving
condensation sensor
mirror
light
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境　浩司
Koji Sakai
浩司 境
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Panasonic Intellectual Property Management Co Ltd
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Abstract

To provide a dew condensation sensor which can accurately detect dew condensation in a variety of environments such as an environment prone to contaminate a tabular member and a high-humidity environment.SOLUTION: In order to achieve this purpose, the present disclosure relates to a dew condensation sensor 1 which detects dew condensation occurring on a tabular member 2, has a light emitting unit 4 for emitting infrared rays 3 toward the tabular member 2 and a light receiving unit 5 for receiving the infrared rays 3 reflected by the tabular member 2, and is configured so that a wavelength of the infrared rays 3 received by the light receiving unit 5 is 2.9 to 3.1 μm.SELECTED DRAWING: Figure 1

Description

本開示は、窓などの板状部材状の部材に生じた結露を検出する結露センサに関する。   The present disclosure relates to a dew condensation sensor that detects dew condensation generated on a plate-like member such as a window.

従来から、赤外線を用いて窓に生じた結露を検出する結露センサが知られている。   Conventionally, a dew condensation sensor that detects dew condensation generated on a window using infrared rays is known.

特許第４５１３６８１号公報Japanese Patent No. 4513681 特許第５９０５３１４号公報Japanese Patent No. 5905314

しかしながら、特許文献１の結露センサでは、水以外の物体が付着した場合に結露を高精度に検出することができず、特許文献２の結露センサでは、温度が低く、湿度が高い条件下では結露を高精度に検出することができないという課題があった。   However, the dew condensation sensor of Patent Document 1 cannot detect dew condensation with high accuracy when an object other than water adheres, and the dew condensation sensor of Patent Document 2 dew condensation under conditions of low temperature and high humidity. There was a problem that it was not possible to detect this with high accuracy.

本開示は、上記課題を解決し、様々な使用条件で高精度に結露を検出することができる結露センサを提供することを目的としている。   An object of the present disclosure is to solve the above-described problems and provide a dew condensation sensor capable of detecting dew condensation with high accuracy under various use conditions.

上記課題を解決するために本発明の結露センサは、板状部材に生じた結露を検出する結露センサであって、板状部材に向かって赤外線を発光する発光部と、板状部材で反射した赤外線を受光する受光部と、を有し、受光部が受光する赤外線の波長が、２．９μｍ〜３．１μｍである構成とした。   In order to solve the above problems, a dew condensation sensor according to the present invention is a dew condensation sensor that detects dew condensation generated on a plate-like member, and is reflected by the plate-like member and a light emitting unit that emits infrared rays toward the plate-like member. And a light receiving portion that receives infrared light, and the wavelength of infrared light received by the light receiving portion is 2.9 μm to 3.1 μm.

上記構成により本発明は、水と水蒸気を、様々な環境において結露を精度よく検出することができる。   With the above configuration, the present invention can accurately detect dew condensation in water and water vapor in various environments.

実施の形態１の結露センサの構成を示す図The figure which shows the structure of the dew condensation sensor of Embodiment 1. 水蒸気の波長と光の透過率を示すグラフGraph showing water vapor wavelength and light transmittance 液状の水の波長と光の透過率を示すグラフGraph showing liquid water wavelength and light transmittance 実施の形態２の結露センサの構成を示す図The figure which shows the structure of the dew condensation sensor of Embodiment 2. 液状の水の波長と光の透過率を示すグラフGraph showing liquid water wavelength and light transmittance 実施の形態３の結露センサの構成を示す図The figure which shows the structure of the dew condensation sensor of Embodiment 3. 水蒸気の波長と光の透過率を示すグラフGraph showing water vapor wavelength and light transmittance 実施の形態４の結露センサの構成を示す図The figure which shows the structure of the dew condensation sensor of Embodiment 4. 実施の形態５の結露センサの構成を示す図The figure which shows the structure of the dew condensation sensor of Embodiment 5. 同結露センサのＡＡ線断面図AA line cross section of the condensation sensor 実施の形態６の結露センサの構成を示す図The figure which shows the structure of the dew condensation sensor of Embodiment 6. 同結露センサのＢＢ線断面図BB line cross section of the condensation sensor

以下に、実施の形態に係る結露センサと結露報知装置について図面を用いて説明をする。なお、各図面において、同様の構成については、同一の符号を付し、説明を省略する。
また、各実施の形態における各構成要素は矛盾のない範囲で任意に組み合わせても良い。また、各実施の形態における構成は発明を逸脱しない範囲で変更することが可能である。 Below, the dew condensation sensor and dew condensation alerting device concerning an embodiment are explained using a drawing. In addition, in each drawing, about the same structure, the same code | symbol is attached | subjected and description is abbreviate | omitted.
In addition, each component in each embodiment may be arbitrarily combined within a consistent range. The configuration in each embodiment can be changed without departing from the scope of the invention.

（実施の形態１）
以下に、本実施の形態１の結露センサについて、図面を用いながら説明する。 (Embodiment 1)
Below, the dew condensation sensor of this Embodiment 1 is demonstrated, using drawing.

図１は実施の形態１の結露センサの構成を示す図、図２は水蒸気の波長と透過率を示す図、図３は水の波長と透過率を示す図である。   FIG. 1 is a diagram showing the configuration of the dew condensation sensor of the first embodiment, FIG. 2 is a diagram showing the wavelength and transmittance of water vapor, and FIG. 3 is a diagram showing the wavelength and transmittance of water.

実施の形態１の結露センサ１は、板状部材２に向かって赤外線３を発光する発光部４と、赤外線３を受光する受光部５と、発光部４を制御して赤外線３を発光させる処理回路（図示せず）を有している。また、処理回路は赤外線３を受光した受光部５が出力する信号を信号処理するように構成している。一つの処理回路で発光部４の制御と受光部５の信号処理をしているが、２つの処理回路を用いても良い。発光部４と受光部５は、発光部４から発光された赤外線３が板状部材２で反射して受光部５に入射する位置関係で配置されている。   The dew condensation sensor 1 according to the first embodiment includes a light emitting unit 4 that emits infrared rays 3 toward the plate-like member 2, a light receiving unit 5 that receives infrared rays 3, and a process that controls the light emitting units 4 to emit infrared rays 3. A circuit (not shown) is included. The processing circuit is configured to perform signal processing on a signal output from the light receiving unit 5 that has received the infrared rays 3. Although one processing circuit controls the light emitting unit 4 and the signal processing of the light receiving unit 5, two processing circuits may be used. The light emitting unit 4 and the light receiving unit 5 are arranged in a positional relationship in which the infrared rays 3 emitted from the light emitting unit 4 are reflected by the plate member 2 and enter the light receiving unit 5.

実施の形態１の板状部材２は、窓であるものと想定して説明する。なお、窓に限らず、壁等の板状の部材であれば、実施の形態１の結露センサ１を用いることができる。ここで言う板状部材２とは、完全な平板状のものに限らず車のガラスの様に湾曲したものも含まれる。板状部材２にはミラー６が設けられており、発光部４はミラー６に向かって赤外線３を発光している。ミラー６は金やアルミニウムなどの赤外線３を反射しやすく、かつ、熱伝導の良い材料で形成されている。ミラー６に熱伝導の良い材料を用いることによって、ミラー６の温度が板状部材２の温度に近くなり、板状部材２に結露が生じたときにミラー６にも結露が生じやすくなる。これにより、ミラー６で赤外線３を反射しても精度良く結露を検出することができる。また、ミラー６は可能な限り薄い方が良い。ミラー６を薄く作ることでミラー６の熱容量を小さく出来るため、結露の検出精度がさらに向上する。ミラー６がなくても実施の形態１の結露センサ１の効果を得ることができるが、ミラー６を設けることで赤外線３が反射しやすくなり、結露センサ１の検出精度が向上する。また、板状部材２が窓ガラスなどの透明な部材の場合、外部からの透過光などの影響により検出精度が低下する場合があるが、受光部５に入射する外部光を遮るようにミラー６を配置することで、外部からの赤外線３入射を遮断し、かつ、赤外線３の反射率を向上させることができる。これにより、さらに結露センサ１の検出精度が向上する。   Description will be made assuming that the plate-like member 2 of the first embodiment is a window. In addition, the dew condensation sensor 1 of Embodiment 1 can be used if it is not only a window but plate-shaped members, such as a wall. The plate-like member 2 referred to here is not limited to a completely flat plate-like member, but also includes a curved member such as a car glass. The plate-like member 2 is provided with a mirror 6, and the light emitting unit 4 emits infrared rays 3 toward the mirror 6. The mirror 6 is made of a material that easily reflects the infrared rays 3 such as gold and aluminum and has good heat conduction. By using a material having good heat conduction for the mirror 6, the temperature of the mirror 6 becomes close to the temperature of the plate-like member 2, and when the condensation occurs on the plate-like member 2, the mirror 6 is also likely to cause condensation. Thereby, even if the infrared rays 3 are reflected by the mirror 6, dew condensation can be detected with high accuracy. The mirror 6 should be as thin as possible. Since the heat capacity of the mirror 6 can be reduced by making the mirror 6 thin, the detection accuracy of dew condensation is further improved. Even if the mirror 6 is not provided, the effect of the dew condensation sensor 1 of the first embodiment can be obtained. However, by providing the mirror 6, the infrared rays 3 are easily reflected, and the detection accuracy of the dew condensation sensor 1 is improved. In addition, when the plate-like member 2 is a transparent member such as a window glass, the detection accuracy may be lowered due to the influence of transmitted light from the outside, but the mirror 6 so as to block the external light incident on the light receiving unit 5. By arranging, the incidence of infrared rays 3 from the outside can be blocked and the reflectance of infrared rays 3 can be improved. Thereby, the detection accuracy of the dew condensation sensor 1 is further improved.

発光部４は、発光素子（図示せず）を有し、発光素子には赤外線３を発光可能な発光ダイオードを用いている。発光ダイオードには、半導体のベアチップを用いている。発光部４には、発光ダイオードチップ、半導体基板上に形成した抵抗素子やレーザダイオードなどを用いることができる。   The light emitting unit 4 includes a light emitting element (not shown), and a light emitting diode capable of emitting infrared rays 3 is used as the light emitting element. A semiconductor bare chip is used for the light emitting diode. For the light emitting unit 4, a light emitting diode chip, a resistance element formed on a semiconductor substrate, a laser diode, or the like can be used.

受光部５は、受光素子７を有し、受光素子７には半導体のベアチップが用いられている。半導体のベアチップだけに限られず、チップ・サイズ・パッケージを用いたものであっても良い。受光部５は、たとえば、焦電素子やフォトダイオードチップでも良い。   The light receiving unit 5 includes a light receiving element 7, and a semiconductor bare chip is used for the light receiving element 7. It is not limited to a semiconductor bare chip, but may be a chip size package. The light receiving unit 5 may be, for example, a pyroelectric element or a photodiode chip.

ただし、発光素子も受光素子７もベアチップを用いることにより、結露センサ１全体の大きさを小型化することができる。   However, the size of the entire dew condensation sensor 1 can be reduced by using bare chips for both the light emitting element and the light receiving element 7.

結露センサ１は、結露により板状部材２に生じた水滴による赤外線３の吸収を測定することで結露の検出を行う。板状部材２の表面に結露がない場合の赤外線３の反射光強度に対し、板状部材２表面に結露が始まると赤外線３の吸収が生じ、反射光強度が低下する。それにより結露を検出することができる。   The dew condensation sensor 1 detects dew condensation by measuring absorption of infrared rays 3 by water droplets generated on the plate-like member 2 due to dew condensation. In contrast to the reflected light intensity of the infrared ray 3 when there is no condensation on the surface of the plate-like member 2, when the condensation starts on the surface of the plate-like member 2, absorption of the infrared ray 3 occurs and the reflected light intensity decreases. Thereby, dew condensation can be detected.

受光部５には、フィルタ８が設けられており、発光部４から発光されミラー６で反射した赤外線３がフィルタ８を通過して受光素子７に入射する。フィルタ８は、２．９μｍ〜３．１μｍ（３２００ｃｍ−１〜３４００ｃｍ−１）の波長Ｌ１の赤外線３のみを透過させる。図２、図３に示すように、２．９μｍ〜３．１μｍの波長Ｌ１の赤外線３は水では吸収されるが、水蒸気では水に比べて吸収量が非常に小さい。このため、２．９μｍ〜３．１μｍの波長Ｌ１の赤外線３のみを用いて結露の検出をすることにより、水蒸気量が多くても水蒸気の影響を受けずに結露を精度よく検出することができる。また、結露により生じた水滴による赤外線３の吸収は、水滴の厚さが１μｍで約３０％、５μｍで約９０％とわずかに結露が生じるだけでも受光部５の出力は大きく変化する。このため、板状部材２の結露による赤外線３の吸収を結露が生じ始めてすぐに検出することができ、応答性の良い結露センサ１を得ることができる。また、水滴による吸収が非常に大きいため、水滴以外の物体がミラー６に付着していても、結露を精度良く検出することができる。この様に、実施の形態１の結露センサ１は、ミラー６が汚れやすい、水蒸気が非常に多いなどの結露センサ１の使用環境に依らず、結露を精度良く検出することができる。 The light receiving unit 5 is provided with a filter 8, and the infrared rays 3 emitted from the light emitting unit 4 and reflected by the mirror 6 pass through the filter 8 and enter the light receiving element 7. The filter 8 transmits only the infrared rays 3 having a wavelength L1 of 2.9 μm to 3.1 μm (3200 cm −1 to 3400 cm −1 ). As shown in FIGS. 2 and 3, the infrared rays 3 having a wavelength L1 of 2.9 μm to 3.1 μm are absorbed by water, but the amount of absorption by water vapor is much smaller than that of water. For this reason, by detecting condensation using only the infrared ray 3 having a wavelength L1 of 2.9 μm to 3.1 μm, it is possible to accurately detect condensation without being affected by water vapor even if the amount of water vapor is large. . Further, the absorption of the infrared rays 3 by water droplets generated by condensation greatly changes the output of the light receiving unit 5 even if the water droplet thickness is about 30% at 1 μm and about 90% at 5 μm. For this reason, the absorption of the infrared rays 3 due to the condensation of the plate-like member 2 can be detected immediately after the start of the condensation, and the condensation sensor 1 having a good response can be obtained. Further, since the absorption by water droplets is very large, even if an object other than water droplets adheres to the mirror 6, dew condensation can be detected with high accuracy. As described above, the dew condensation sensor 1 according to the first embodiment can detect dew condensation with high accuracy regardless of the use environment of the dew condensation sensor 1 such that the mirror 6 is easily soiled and the amount of water vapor is very large.


（実施の形態２）
以下に、本実施の形態２の結露センサについて、図面を用いながら説明する。
(Embodiment 2)
Below, the dew condensation sensor of this Embodiment 2 is demonstrated, using drawing.

図４は実施の形態２の結露センサの構成を示す図、図５は水の波長と透過率である。   FIG. 4 is a diagram showing the configuration of the dew condensation sensor according to Embodiment 2, and FIG. 5 shows the wavelength and transmittance of water.

実施の形態２の結露センサ１１は、板状部材２に向かって赤外線３を発光する発光部４と、赤外線３を受光する受光部１２と、発光部４の制御と受光部１２の信号処理をする処理回路を有している。板状部材２には、ミラー６が設けられ、発光部４はミラー６に向かって赤外線３を発光し、受光部１２はミラー６で反射した赤外線３を検出している。   The dew condensation sensor 11 according to the second embodiment includes a light emitting unit 4 that emits infrared rays 3 toward the plate-like member 2, a light receiving unit 12 that receives infrared rays 3, control of the light emitting unit 4, and signal processing of the light receiving unit 12. A processing circuit. The plate-like member 2 is provided with a mirror 6, the light emitting unit 4 emits infrared rays 3 toward the mirror 6, and the light receiving unit 12 detects the infrared rays 3 reflected by the mirror 6.

実施の形態２の結露センサ１１では、受光部１２が第１の受光素子１３と第２の受光素子１４を有している。第１の受光素子１３と第２の受光素子１４には、半導体のベアチップが用いられている。半導体のベアチップだけに限られず、チップ・サイズ・パッケージを用いたものであっても良い。第１の受光素子１３と第２の受光素子１４は、たとえば、焦電素子やフォトダイオードチップでも良い。第１の受光素子１３の前方には第１のフィルタ１５が設けられ、赤外線３は第１のフィルタ１５を通過して第１の受光素子１３に入射する。第２の受光素子１４の前方には第２のフィルタ１６が設けられ、赤外線３は第２のフィルタ１６を通過して第２の受光素子１４に入射する。第１のフィルタ１５は２．９μｍ〜３．１μｍの波長Ｌ１の赤外線３を透過し、第２のフィルタ１６は３．６μｍ〜４．２μｍ（２３００〜２８００−１）の波長Ｌ２の赤外線３を透過する。第２のフィルタ１６が透過する３．６μｍ〜４．２μｍの波長Ｌ２の赤外線３は液状の水による吸収が小さい。処理回路は第１の受光素子１３の出力と第２の受光素子１４の出力の差動出力により、結露の検出をする。第２の受光素子１４の出力は水により吸収されにくい波長のため、差動出力により結露を検出することにより液状の水による赤外線３の吸収の検出精度が向上し、発光部４の劣化やミラー６の汚れなどの影響を低減することができる。また、第１のフィルタ１５と第２のフィルタ１６は受光面が同一平面になるように形成されている。なお、ここで言う同一平面は第１のフィルタ１５と第２のフィルタ１６の設置時に生じる誤差の範囲で許容される。第１のフィルタ１５と第２のフィルタ１６が同一平面状にあることにより、ミラー６から第１の受光素子１３までの距離とミラー６から第２の受光素子１４までの距離が等距離になるように配置しやすくなる。これにより、第１の受光素子１３に入射する赤外線３と第２の受光素子１４に入射する赤外線３の光路差が小さくなるため、結露の検出精度が向上する。 In the dew condensation sensor 11 according to the second embodiment, the light receiving unit 12 includes a first light receiving element 13 and a second light receiving element 14. A semiconductor bare chip is used for the first light receiving element 13 and the second light receiving element 14. It is not limited to a semiconductor bare chip, but may be a chip size package. The first light receiving element 13 and the second light receiving element 14 may be, for example, pyroelectric elements or photodiode chips. A first filter 15 is provided in front of the first light receiving element 13, and the infrared rays 3 pass through the first filter 15 and enter the first light receiving element 13. A second filter 16 is provided in front of the second light receiving element 14, and the infrared light 3 passes through the second filter 16 and enters the second light receiving element 14. The first filter 15 transmits infrared rays 3 having a wavelength L1 of 2.9 μm to 3.1 μm, and the second filter 16 transmits infrared rays 3 of a wavelength L2 of 3.6 μm to 4.2 μm (2300 to 2800 −1 ). To Penetrate. The infrared rays 3 having a wavelength L2 of 3.6 μm to 4.2 μm transmitted through the second filter 16 are less absorbed by liquid water. The processing circuit detects dew condensation based on the differential output of the output of the first light receiving element 13 and the output of the second light receiving element 14. Since the output of the second light receiving element 14 is a wavelength that is difficult to be absorbed by water, detecting the dew condensation by the differential output improves the detection accuracy of absorption of the infrared rays 3 by liquid water, and deteriorates the light emitting unit 4 and the mirror. 6 can be reduced. The first filter 15 and the second filter 16 are formed so that the light receiving surfaces are on the same plane. The same plane referred to here is allowed within a range of errors that occur when the first filter 15 and the second filter 16 are installed. Since the first filter 15 and the second filter 16 are in the same plane, the distance from the mirror 6 to the first light receiving element 13 and the distance from the mirror 6 to the second light receiving element 14 are equal. It will be easier to arrange. Thereby, since the optical path difference between the infrared rays 3 incident on the first light receiving element 13 and the infrared rays 3 incident on the second light receiving element 14 is reduced, the detection accuracy of dew condensation is improved.


（実施の形態３）
以下に、本実施の形態３の結露センサについて、図面を用いながら説明する。
(Embodiment 3)
Below, the dew condensation sensor of this Embodiment 3 is demonstrated, using drawing.

図６は実施の形態３の結露センサの構成を示す図、図７は水蒸気の波長と透過率を示す図である。   FIG. 6 is a diagram illustrating the configuration of the dew condensation sensor according to Embodiment 3, and FIG. 7 is a diagram illustrating the wavelength and transmittance of water vapor.

実施の形態３の結露センサ２１は、板状部材２に向かって赤外線３を発光する発光部４と、赤外線３を受光する受光部２２と、結露センサ２１の環境温度を検出する温度センサ２３と、結露を報知する報知部２４と、発光部４の制御と受光部２２の信号処理をする処理回路を有している。また、処理回路は温度センサ２３の検出結果から結露の予測を行う。これらの動作を一つの処理回路で行っても良いし、複数の処理回路を用いても良い。板状部材２には、ミラー６が設けられ、発光部４はミラー６に向かって赤外線３を発光し、受光部２２はミラー６で反射した赤外線３を検出している。   The dew condensation sensor 21 of the third embodiment includes a light emitting unit 4 that emits infrared rays 3 toward the plate-like member 2, a light receiving unit 22 that receives infrared rays 3, and a temperature sensor 23 that detects the environmental temperature of the dew condensation sensor 21. And a notifying unit 24 for notifying dew condensation, and a processing circuit for controlling the light emitting unit 4 and performing signal processing of the light receiving unit 22. Further, the processing circuit predicts condensation based on the detection result of the temperature sensor 23. These operations may be performed by one processing circuit, or a plurality of processing circuits may be used. The plate-like member 2 is provided with a mirror 6, the light emitting unit 4 emits infrared light 3 toward the mirror 6, and the light receiving unit 22 detects the infrared light 3 reflected by the mirror 6.

温度センサ２３にはサーミスタが用いられている。温度センサ２３は、サーミスタに限定されるものではなく、結露センサ２１の環境温度を検出することができれば、他の温度センサ２３を用いても良い。温度センサ２３は板状部材２に設けられている。温度センサ２３の設置位置は、板状部材２に限定されるものではなく、受光部２２や発光部４に温度センサ２３を設けるようにしても良いし、結露センサ２１の近くにある他の電子部品に温度センサ２３が備わっている場合には、他の電信部品の温度センサ２３の検出結果を参照するように構成しても良い。   A thermistor is used for the temperature sensor 23. The temperature sensor 23 is not limited to a thermistor, and other temperature sensors 23 may be used as long as the environmental temperature of the dew condensation sensor 21 can be detected. The temperature sensor 23 is provided on the plate member 2. The installation position of the temperature sensor 23 is not limited to the plate-like member 2, and the temperature sensor 23 may be provided in the light receiving unit 22 or the light emitting unit 4, or other electronic devices near the dew condensation sensor 21. When the temperature sensor 23 is provided in the component, the detection result of the temperature sensor 23 of another telegraph component may be referred to.

受光部２２は、第１の受光素子１３と第２の受光素子１４を有し、第１の受光素子１３の前方には第１のフィルタ１５が設けられ、第２の受光素子１４の前方には第２のフィルタ２５が設けられている。第１のフィルタ１５は２．９μｍ〜３．１μｍの波長Ｌ１の赤外線３を透過し、第２のフィルタ２５は２．６μｍ〜２．７μｍ（３７００〜３８００ｃｍ−１）の波長Ｌ３の赤外線３を透過する。図２に示すように、２．６μｍ〜２．７μｍの波長Ｌ３の赤外線３は水蒸気で吸収量が多く、水滴では吸収量が少ない。このため、空気中の水分量を検出することができる。処理回路は、第２の受光素子１４の出力と温度センサ２３の出力から露点を推定し、第１の受光素子１３の出力から検出した結露の検出結果とあわせることで、結露の予測を行う。報知部２４は、スピーカを有しており、結露センサ２１の使用者に結露の予測結果を報知する。結露センサ２１においては、報知部２４は板状部材２に設けられているが、報知部２４の設置位置は板状部材２に限られず、結露センサ２１の使用者に報知できる位置なら何処でも良い。また、報知部２４はスピーカに限定されず、例えば、ディスプレイなどに結露の予測結果を報知するようにしても良い。 The light receiving unit 22 includes a first light receiving element 13 and a second light receiving element 14, a first filter 15 is provided in front of the first light receiving element 13, and in front of the second light receiving element 14. Is provided with a second filter 25. The first filter 15 transmits infrared rays 3 having a wavelength L1 of 2.9 μm to 3.1 μm, and the second filter 25 transmits infrared rays 3 having a wavelength L3 of 2.6 μm to 2.7 μm (3700 to 3800 cm −1 ). To Penetrate. As shown in FIG. 2, the infrared rays 3 having a wavelength L3 of 2.6 μm to 2.7 μm have a large amount of absorption with water vapor and a small amount of absorption with water droplets. For this reason, the amount of moisture in the air can be detected. The processing circuit estimates the dew point from the output of the second light receiving element 14 and the output of the temperature sensor 23, and predicts the dew condensation by combining with the detection result of the dew condensation detected from the output of the first light receiving element 13. The notification unit 24 includes a speaker, and notifies the user of the dew condensation sensor 21 of the dew condensation prediction result. In the dew condensation sensor 21, the notification unit 24 is provided on the plate-like member 2, but the installation position of the notification unit 24 is not limited to the plate-like member 2, and may be anywhere as long as it can notify the user of the dew condensation sensor 21. . Further, the notification unit 24 is not limited to a speaker, and for example, a predicted result of condensation may be notified to a display or the like.

（実施の形態４）
以下に、本実施の形態４の結露センサについて、図面を用いながら説明する。 (Embodiment 4)
Hereinafter, the dew condensation sensor of the fourth embodiment will be described with reference to the drawings.

図８は実施の形態４の結露センサの構成を示す図である。   FIG. 8 is a diagram illustrating a configuration of the dew condensation sensor according to the fourth embodiment.

実施の形態４の結露センサ３１は、板状部材２に向かって赤外線３を発光する発光部４と、赤外線３を受光する受光部１２と、発光部４の制御と受光部１２の信号処理をする処理回路を有している。受光部１２は第１の受光素子１３と第２の受光素子１４と第１のフィルタ１５と第２のフィルタ１６を有している。第１のフィルタ１５は２．９μｍ〜３．１μｍの波長Ｌ１の赤外線３を透過し、第２のフィルタ１６は３．６μｍ〜４．２μｍの波長Ｌ２の赤外線３を透過する。   The dew condensation sensor 31 according to the fourth embodiment performs a light emitting unit 4 that emits infrared rays 3 toward the plate-like member 2, a light receiving unit 12 that receives infrared rays 3, and controls the light emitting unit 4 and signal processing of the light receiving unit 12. A processing circuit. The light receiving unit 12 includes a first light receiving element 13, a second light receiving element 14, a first filter 15, and a second filter 16. The first filter 15 transmits infrared rays 3 having a wavelength L1 of 2.9 μm to 3.1 μm, and the second filter 16 transmits infrared rays 3 having a wavelength L2 of 3.6 μm to 4.2 μm.

板状部材２には、熱伝導部３２が設けられ、熱伝導部３２にミラー６が設けられている
。発光部４はミラー６に向かって赤外線３を発光し、受光部１２はミラー６で反射した赤外線３を検出している。ミラー６には金やアルミニウムの熱伝導率が高く、かつ、赤外線３を反射しやすい材料が用いられている。熱伝導部３２は、グラファイトシート、銅、アルミニウムのいずれか、または、その複合材料からミラー６よりも熱伝導率の高材料を選択し、形成されている。熱伝導部３２の熱伝導率をミラー６の熱伝導率よりも高くすることで、ミラー６の温度が板状部材２の温度に近くなり、板状部材２に結露が生じたときと近いタイミングでミラー６にも結露が生じる。これにより、結露センサ３１の応答性が向上する。 The plate-like member 2 is provided with a heat conducting portion 32, and the mirror 6 is provided on the heat conducting portion 32. The light emitting unit 4 emits infrared rays 3 toward the mirror 6, and the light receiving unit 12 detects the infrared rays 3 reflected by the mirror 6. The mirror 6 is made of a material having high thermal conductivity of gold or aluminum and easily reflecting the infrared rays 3. The heat conduction part 32 is formed by selecting a material having a higher thermal conductivity than that of the mirror 6 from graphite sheet, copper, aluminum, or a composite material thereof. By making the thermal conductivity of the heat conducting part 32 higher than the thermal conductivity of the mirror 6, the temperature of the mirror 6 becomes close to the temperature of the plate-like member 2, and the timing close to the time when condensation occurs on the plate-like member 2. As a result, condensation also occurs on the mirror 6. Thereby, the responsiveness of the dew condensation sensor 31 improves.

（実施の形態５）
以下に、本実施の形態５の結露センサについて、図面を用いながら説明する。 (Embodiment 5)
Hereinafter, the dew condensation sensor of the fifth embodiment will be described with reference to the drawings.

図９は実施の形態５の結露センサの構成を示す図、図１０は同結露センサのＡＡ線断面図である。   FIG. 9 is a diagram showing the configuration of the dew condensation sensor of the fifth embodiment, and FIG. 10 is a cross-sectional view taken along the line AA of the dew condensation sensor.

実施の形態５の結露センサ４１は、板状部材２に向かって赤外線３を発光する発光部４と、赤外線３を受光する受光部１２と、発光部４の制御と受光部１２の信号処理をする処理回路と、結露を報知する報知部２４を有している。受光部１２は第１の受光素子１３と第２の受光素子１４と第１のフィルタ１５と第２のフィルタ１６を有している。第１のフィルタ１５は２．９μｍ〜３．１μｍの波長Ｌ１の赤外線３を透過し、第２のフィルタ１６は３．６μｍ〜４．２μｍの波長Ｌ２の赤外線３を透過する。板状部材２には熱伝導部３２を介してミラー６が設けられている。   The dew condensation sensor 41 according to the fifth embodiment performs the light emitting unit 4 that emits the infrared light 3 toward the plate-like member 2, the light receiving unit 12 that receives the infrared light 3, the control of the light emitting unit 4, and the signal processing of the light receiving unit 12. And a notifying unit 24 for notifying dew condensation. The light receiving unit 12 includes a first light receiving element 13, a second light receiving element 14, a first filter 15, and a second filter 16. The first filter 15 transmits infrared rays 3 having a wavelength L1 of 2.9 μm to 3.1 μm, and the second filter 16 transmits infrared rays 3 having a wavelength L2 of 3.6 μm to 4.2 μm. The plate-like member 2 is provided with a mirror 6 via a heat conducting portion 32.

実施の形態５の結露センサ４１は、発光部４と、受光部１２と、処理回路と、熱伝導部３２の一部を覆う筐体４２を有している。熱伝導部３２は一端と他端を有し、ミラー６は一端に設けられている。発光部４、受光部１２は完全に筐体４２に収容されており、熱伝導部３２は一端側のミラー６が設けられた部分が筐体４２に収容されている。熱伝導部３２の他端は筐体４２の外に延出しており、熱伝導部３２の他端が板状部材２に接続されている。熱伝導部３２の他端が板状部材２に接続されていることで、筐体４２に覆われた状態でもミラー６の温度が板状部材２の温度に近くなり、板状部材２に結露が生じたときにミラー６にも結露が生じやすくなる。また、筐体４２は内外を連通するスリット４３を有している。筐体４２にスリット４３を設けることで、板状部材２近傍の空気が筐体４２に流入するようになり、筐体４２内の環境が板状部材２の周囲環境に近くなる。これにより、板状部材２にさらに近いタイミングでミラー６に結露が生じるようになり、結露センサ４１の応答性が向上する。   The dew condensation sensor 41 of the fifth embodiment has a housing 42 that covers a part of the light emitting unit 4, the light receiving unit 12, the processing circuit, and the heat conducting unit 32. The heat conducting portion 32 has one end and the other end, and the mirror 6 is provided at one end. The light emitting unit 4 and the light receiving unit 12 are completely housed in the housing 42, and the heat conducting unit 32 is housed in the housing 42 at a portion where the mirror 6 on one end side is provided. The other end of the heat conducting portion 32 extends outside the housing 42, and the other end of the heat conducting portion 32 is connected to the plate member 2. Since the other end of the heat conducting portion 32 is connected to the plate-like member 2, the temperature of the mirror 6 becomes close to the temperature of the plate-like member 2 even when it is covered by the housing 42, and condensation occurs on the plate-like member 2. When this occurs, condensation also tends to occur on the mirror 6. Moreover, the housing | casing 42 has the slit 43 which connects inside and outside. By providing the slit 43 in the housing 42, the air in the vicinity of the plate-like member 2 flows into the housing 42, and the environment in the housing 42 is close to the surrounding environment of the plate-like member 2. As a result, condensation occurs on the mirror 6 at a timing closer to the plate-like member 2, and the responsiveness of the condensation sensor 41 is improved.

このように、実施の形態５の結露センサ４１では、筐体４２内に発光部４、受光部１２、処理回路、板状部材２の一部を収容することにより、結露センサの使用者が板状部材２を見たときに、結露センサ４１により使用者の視野が妨げられることを防ぐことができる。例えば、結露センサを車のフロントガラスに適用した場合には、結露センサの使用者であるドライバーの視界を妨げることなく結露を検出することができ、ドライバーの安全性を向上させることが出来る。また、報知部２４を有しているため、結露センサ４１の使用者に結露を報知することができ、結露センサ４１を車のフロントガラスに適用する場合には、ドライバーに結露を素早く報知することで、ドライバーの安全性を向上させることができる。   As described above, in the dew condensation sensor 41 according to the fifth embodiment, the light emitting unit 4, the light receiving unit 12, the processing circuit, and a part of the plate-like member 2 are housed in the housing 42, so that the user of the dew condensation sensor can obtain a plate. When the shaped member 2 is viewed, it is possible to prevent the user's visual field from being obstructed by the dew condensation sensor 41. For example, when a dew condensation sensor is applied to a windshield of a car, dew condensation can be detected without disturbing the field of view of the driver who is the user of the dew condensation sensor, and the safety of the driver can be improved. Moreover, since it has the alerting | reporting part 24, it can alert | report condensation to the user of the condensation sensor 41, and when applying the condensation sensor 41 to a windshield of a car, it informs a driver of condensation quickly. Thus, the safety of the driver can be improved.

（実施の形態６）
以下に、本実施の形態６の結露センサについて、図面を用いながら説明する。 (Embodiment 6)
Hereinafter, the dew condensation sensor of the sixth embodiment will be described with reference to the drawings.

図１１は実施の形態６の結露センサの構成を示す図、図１２は同結露センサのＢＢ線断
面図である。 FIG. 11 is a diagram showing a configuration of a dew condensation sensor according to Embodiment 6, and FIG. 12 is a cross-sectional view of the dew condensation sensor taken along line BB.

実施の形態６の結露センサ５１は、板状部材２に向かって赤外線３を発光する発光部４と、赤外線３を受光する受光部１２と、発光部４の制御と受光部１２の信号処理をする処理回路と、結露を報知する報知部２４を有している。受光部１２は第１の受光素子１３と第２の受光素子１４と第１のフィルタ１５と第２のフィルタ１６を有している。第１のフィルタ１５は２．９μｍ〜３．１μｍの波長Ｌ１の赤外線３を透過し、第２のフィルタ１６は３．６μｍ〜４．２μｍの波長Ｌ２の赤外線３を透過する。板状部材２には熱伝導部３２を介してミラー６が設けられている。発光部４と、受光部１２と、板状部材２のミラー６が設けられた一端側を覆うスリット４３を有した筐体４２が設けられている。   The dew condensation sensor 51 according to the sixth embodiment performs the light emitting unit 4 that emits infrared rays 3 toward the plate-like member 2, the light receiving unit 12 that receives the infrared rays 3, the control of the light emitting unit 4, and the signal processing of the light receiving unit 12. And a notifying unit 24 for notifying dew condensation. The light receiving unit 12 includes a first light receiving element 13, a second light receiving element 14, a first filter 15, and a second filter 16. The first filter 15 transmits infrared rays 3 having a wavelength L1 of 2.9 μm to 3.1 μm, and the second filter 16 transmits infrared rays 3 having a wavelength L2 of 3.6 μm to 4.2 μm. The plate-like member 2 is provided with a mirror 6 via a heat conducting portion 32. A housing 42 having a slit 43 that covers one end of the light emitting unit 4, the light receiving unit 12, and the mirror 6 of the plate-like member 2 is provided.

実施の形態６の結露センサ５１は、車のフロントガラスに結露センサを適用しているものとして説明をする。   The dew condensation sensor 51 of the sixth embodiment will be described on the assumption that the dew condensation sensor is applied to the windshield of a car.

結露センサ５１は、筐体４２がダッシュボードと一体化している。これにより、実施の形態５の結露センサ５１に比べてさらにドライバーの視野を妨げることなく、結露を検出することができるようになる。また、ダッシュボードと結露センサを一体化することで、車内に筐体４２を設ける必要がないため、省スペース化し、生産性も向上する。このように構成された結露センサを用いることにより、ドライバーの安全性、快適性が向上する。   As for the dew condensation sensor 51, the housing | casing 42 is integrated with the dashboard. As a result, the dew condensation can be detected without disturbing the visual field of the driver as compared with the dew condensation sensor 51 of the fifth embodiment. Further, by integrating the dashboard and the dew condensation sensor, it is not necessary to provide the housing 42 in the vehicle, so that space is saved and productivity is improved. By using the dew condensation sensor configured in this way, the safety and comfort of the driver are improved.

本開示の結露センサによれば、板状部材が汚染されやすい環境や空気中の水分量が多い環境でも精度良く結露を検出することができるため、車の窓ガラスの結露検出などに適している。   According to the dew condensation sensor of the present disclosure, it is possible to detect dew condensation with high accuracy even in an environment where the plate-like member is easily contaminated or in an environment where there is a large amount of moisture in the air, which is suitable for detecting dew condensation on a car window glass. .

１、１１、２１、３１、４１、５１ 結露センサ
２ 板状部材
３ 赤外線
４ 発光部
５、１２、２２ 受光部
６ ミラー
７ 受光素子
８ フィルタ
１３ 第１の受光素子
１４ 第２の受光素子
１５ 第１のフィルタ
１６、２５ 第２のフィルタ
２３ 温度センサ
２４ 報知部
３２ 熱伝導部
４２ 筐体
４３ スリット DESCRIPTION OF SYMBOLS 1, 11, 21, 31, 41, 51 Condensation sensor 2 Plate-shaped member 3 Infrared 4 Light emission part 5, 12, 22 Light reception part 6 Mirror 7 Light reception element 8 Filter 13 1st light reception element 14 2nd light reception element 15 1st 1 filter 16, 25 second filter 23 temperature sensor 24 notification unit 32 heat conduction unit 42 housing 43 slit

Claims (12)

板状部材に生じた結露を検出する結露センサであって、
前記板状部材に向かって赤外線を発光する発光部と、
前記板状部材で反射した赤外線を受光する受光部と、を有し、
前記受光部が受光する赤外線の波長が、２．９μｍ〜３．１μｍである結露センサ。 A dew condensation sensor that detects dew condensation generated on a plate-like member,
A light emitting unit that emits infrared light toward the plate-shaped member;
A light receiving portion for receiving infrared light reflected by the plate-like member,
The dew condensation sensor whose infrared wavelength which the said light-receiving part receives is 2.9 micrometers-3.1 micrometers. 前記受光部は第１の受光素子と第２の受光素子を有し、
前記第１の受光素子が受光する赤外線の波長が２．９μｍ〜３．１μｍであり、
前記第２の受光素子が受光する赤外線の波長は３．６μｍ〜４．２μｍであり、
前記受光部と前記第２の受光部の差動により結露を検出する請求項１に記載の結露センサ。 The light receiving unit includes a first light receiving element and a second light receiving element,
The wavelength of infrared rays received by the first light receiving element is 2.9 μm to 3.1 μm,
The wavelength of infrared rays received by the second light receiving element is 3.6 μm to 4.2 μm,
The dew condensation sensor according to claim 1, wherein dew condensation is detected by a differential between the light receiving unit and the second light receiving unit. 前記第１の受光部と前記第２の受光部の受光面は同一平面上にある請求項２に記載の結露センサ。   The dew condensation sensor according to claim 2, wherein the light receiving surfaces of the first light receiving unit and the second light receiving unit are on the same plane. 前記結露センサの環境温度を検出する温度センサをさらに備え、
前記受光部は第１の受光素子と第２の受光素子と、
前記第１の受光素子の前方に設けられた第１のフィルタと、
前記第２の受光素子の前方に設けられた第２のフィルタと、を有し、
前記第１の受光素子が受光する赤外線の波長が２．９μｍ〜３．１μｍであり、
前記第２の受光素子が受光する赤外線の波長は２．６μｍ〜２．７μｍである結露センサ。 A temperature sensor for detecting an environmental temperature of the dew condensation sensor;
The light receiving unit includes a first light receiving element and a second light receiving element;
A first filter provided in front of the first light receiving element;
A second filter provided in front of the second light receiving element,
The wavelength of infrared rays received by the first light receiving element is 2.9 μm to 3.1 μm,
The dew condensation sensor in which the wavelength of infrared rays received by the second light receiving element is 2.6 μm to 2.7 μm. 前記板状部材にミラーが設けられており、
前記発光部は前記ミラーに向かって赤外線を発光している請求項１〜４のいずれかに記載の結露センサ。 The plate member is provided with a mirror,
The dew condensation sensor according to claim 1, wherein the light emitting unit emits infrared light toward the mirror. 前記ミラーは金またはアルミニウムである請求項５に記載の結露センサ。   The dew condensation sensor according to claim 5, wherein the mirror is gold or aluminum. 前記板状部材にミラーを有した熱伝導部が設けられ、
前記熱伝導部の熱伝導率は前記ミラーの熱伝導率よりも高く、
前記発光部は前記ミラーに向かって赤外線を発光している請求項１〜４のいずれかに記載の結露センサ。 A heat conduction part having a mirror is provided on the plate member,
The thermal conductivity of the thermal conduction part is higher than the thermal conductivity of the mirror,
The dew condensation sensor according to claim 1, wherein the light emitting unit emits infrared light toward the mirror. 前記ミラーは金またはアルミニウムである請求項７に記載の結露センサ。   The dew condensation sensor according to claim 7, wherein the mirror is gold or aluminum. 前記熱伝導部はグラファイトシート、銅、アルミニウムのいずれか、または、その複合材料である請求項７または８に記載の結露センサ。   The dew condensation sensor according to claim 7 or 8, wherein the heat conducting portion is any one of graphite sheet, copper, aluminum, or a composite material thereof. 前記発光部と、前記受光部と、前記熱伝導部の一部を覆う筐体をさらに備え、
前記熱伝導部は一端と他端を有し、一端側に前記ミラーが設けられ、他端側が前記板状部材と接続され、
前記熱伝導部の前記ミラーが設けられた一端側が前記筐体に覆われている請求項６〜８のいずれかに記載の結露センサ。 A housing that covers a part of the light emitting unit, the light receiving unit, and the heat conducting unit;
The heat conducting part has one end and the other end, the mirror is provided on one end side, the other end side is connected to the plate-like member,
The dew condensation sensor according to any one of claims 6 to 8, wherein one end side of the heat conducting portion on which the mirror is provided is covered with the casing. 前記筐体は、前記筐体の内外を連通するスリットを有している請求項１０に記載の結露センサ。   The dew condensation sensor according to claim 10, wherein the housing has a slit that communicates the inside and outside of the housing. 請求項１０または１１に記載の結露センサと、
前記板状部材に結露が生じたことを報知する報知部を備えた、結露報知装置。 The dew condensation sensor according to claim 10 or 11,
A dew condensation informing device comprising an informing unit for informing that dew condensation has occurred on the plate-like member.
JP2017064395A 2017-03-29 2017-03-29 Dew condensation sensor and dew condensation alarm device using the same Pending JP2018169178A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110646471A (en) * 2019-09-29 2020-01-03 杭州铂得科技有限公司 Microenvironment intelligent monitoring device and microenvironment intelligent monitoring system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110646471A (en) * 2019-09-29 2020-01-03 杭州铂得科技有限公司 Microenvironment intelligent monitoring device and microenvironment intelligent monitoring system

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