JPS5932882Y2 - Radiation thickness gauge with temperature compensation means - Google Patents
Radiation thickness gauge with temperature compensation meansInfo
- Publication number
- JPS5932882Y2 JPS5932882Y2 JP6048578U JP6048578U JPS5932882Y2 JP S5932882 Y2 JPS5932882 Y2 JP S5932882Y2 JP 6048578 U JP6048578 U JP 6048578U JP 6048578 U JP6048578 U JP 6048578U JP S5932882 Y2 JPS5932882 Y2 JP S5932882Y2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermocouple
- signal
- cold junction
- lower detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Description
【考案の詳細な説明】
本考案は、対向配設してなる検出上・下ヘッドの周りの
温度外乱による影響を補償する手段を具えた放射線厚さ
計に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radiation thickness gauge having means for compensating for the effects of temperature disturbances around upper and lower detection heads arranged opposite to each other.
放射線厚さ計における温度外乱には、大きく分けて２種
類ある。There are roughly two types of temperature disturbances in radiation thickness gauges.
その１つは、検出上・下ヘッドのなすギャップの空気層
の温度変化であり、他の１つは、検出上・下ヘッドの箱
内の温度変化である。One is the temperature change in the air layer in the gap between the upper and lower detection heads, and the other is the temperature change inside the box of the upper and lower detection heads.
前者は、ギャップの空気層の密度変化となって測定値そ
のものに影響を与える。The former changes the density of the air layer in the gap and affects the measured value itself.
たとえば、紙の坪量を測定する場合、空気層は１０間当
り約１３９７ｍ２の坪量に和尚し、温度変化１℃当り約
０、０４ ＆ ／７１１２となる。For example, when measuring the basis weight of paper, the air layer will have a basis weight of about 1397 m2 per 10 degrees, and about 0.04 & /7112 per 1 degree Celsius change in temperature.
したがって、空気層の温度変化が５〜６℃もあれば、精
度の点から無視し得ない。Therefore, if the temperature change in the air layer is as much as 5 to 6 degrees Celsius, it cannot be ignored from the viewpoint of accuracy.
しかも、ギャップの温度は、放射線厚さ計の設置場所に
風速があり（抄紙工程においては、発生するスチームを
屋外に排出するために生ずる）、また被測定体によって
空気がまきこまれることがあるため、瞬時的な変化をす
る。Furthermore, the temperature of the gap depends on the wind speed at the location where the radiation thickness meter is installed (this occurs because the steam generated in the papermaking process is discharged outdoors) and because air may be drawn in by the object to be measured. , make instantaneous changes.
一方、後者は、外気温度によって、ゆるやかな変化をな
すが、検出上・下〜ラドに収納されている電離箱や放射
線源の特性に影響を与える。On the other hand, the latter changes slowly depending on the outside temperature, but it affects the characteristics of the ionization chamber and radiation source housed in the upper and lower detection areas.
従来の放射線厚さ計においては、前記特性の異なる温度
外乱による影響を補償するために、ギャップの空気層の
温度検出に、応答性に優れた熱電対を用い、検出上・下
ヘッドの箱内については測温抵抗体でなす構成をなして
いたが、温度検出系を２系統設けることによって温度補
償手段を複雑なものとしていた。In conventional radiation thickness gauges, in order to compensate for the effects of temperature disturbances with different characteristics, thermocouples with excellent responsiveness are used to detect the temperature of the air layer in the gap. Although the structure was made of a temperature measuring resistor, the temperature compensating means was made complicated by providing two temperature detection systems.
また、比較的影響の大きいギャップの空気層の温度変化
のみを補償する手段を設けたものもあるが、これでは高
い測定精度を得ることが期待できなかった。There are also methods that are provided with means for compensating only for the temperature change in the air layer in the gap, which has a relatively large effect, but it cannot be expected to obtain high measurement accuracy with this method.
本考案は、上述の点に鑑みてなされたものであり、その
目的は、特性の異なる温度外乱が測定信号におよぼす影
響を補償するための信号を、簡単な回路構成でなした放
射線厚さ計を提供するにある。The present invention was made in view of the above points, and its purpose is to provide a radiation thickness meter that uses a simple circuit configuration to generate a signal to compensate for the influence of temperature disturbances with different characteristics on the measurement signal. is to provide.
本考案は、ギャップの空気層に熱接点を有し、かつ検出
上・下ヘッドのいずれか一方、又は双方の箱内に冷接点
を有する熱電対と、その冷接点の温度を検出し、その温
度に対応する信号を得ると共に、その信号および熱電対
の起電力側々に、あらかじめ定めた比率に乗じたものを
加算して出力となす手段を具えて、上記目的を実現した
点に特徴がある。The present invention uses a thermocouple that has a hot junction in the air layer of the gap and a cold junction in either or both of the upper and lower detection heads, and detects the temperature of the cold junction. It is characterized by the fact that it achieves the above purpose by providing means for obtaining a signal corresponding to temperature and adding the signal and the electromotive force of the thermocouple multiplied by a predetermined ratio to produce an output. be.
以下、図面を参照して詳しく説明する。A detailed description will be given below with reference to the drawings.
図において、１および２は放射線厚さ計の検出上ヘッド
および検出下ヘッドである。In the figure, 1 and 2 are an upper detection head and a lower detection head of a radiation thickness meter.
検出上・下ヘッド１，２はギャップを設けて対向配設さ
れ、線源２１の発生する放射線を、電離箱１１に受ける
ようになっている。The upper and lower detection heads 1 and 2 are disposed facing each other with a gap provided so that the ionization chamber 11 receives radiation generated by a radiation source 21.
１２は入射窓、２２は照射窓をなしている。12 is an entrance window, and 22 is an irradiation window.
１３は熱電対で１３１はその熱接点を示し、冷接点は基
盤１４に設けである。13 is a thermocouple, 131 indicates its hot junction, and the cold junction is provided on the base plate 14.
Ｒｔは測温抵抗体で、基盤１４の温度、すなわち熱電対
１３の冷接点温度検出素子をなしている。Rt is a temperature measuring resistor, and serves as a temperature detecting element for the temperature of the substrate 14, that is, a cold junction temperature of the thermocouple 13.
３は温度補償信号の出力回路であって、抵抗Ｒ１，Ｒ２
゜Ｒ３、測温抵抗体Ｒｔおよび電源Ｅｓからなるブリッ
ジ回路を構成すると共に、そのブリッジ回路の出力信号
を熱電対１３の起電力に重畳して出力する構成をなして
いる。3 is a temperature compensation signal output circuit, which includes resistors R1 and R2.
A bridge circuit is constituted by R3, a temperature sensing resistor Rt, and a power source Es, and the output signal of the bridge circuit is superimposed on the electromotive force of the thermocouple 13 and output.
上記構成において、熱電対１３の起電力Ｅ１、ブリッジ
回路の不平衡電圧Ｅ２、出力回路３の出力信号Ｅ。In the above configuration, the electromotive force E1 of the thermocouple 13, the unbalanced voltage E2 of the bridge circuit, and the output signal E of the output circuit 3.
は以下の（１）式、（２）式および（３）式で表わすこ
とができる。can be expressed by the following equations (1), (2), and (3).
なお、図面に用いた各符号は、それぞれの値を示すもの
として以下説明する。Note that each symbol used in the drawings will be explained below as indicating a respective value.
Ｅｔ＝Ｅｔｔ−Ｒｔ２（１）
但し、Ｅｔｌ：熱接点温度ｔ１に対応する熱電対の起電
力
Ｅ１□：冷接点温度ｔ２に対応する熱電対の起電力
但し、ｆ（ｔｌ）−Ｅｌ
ｇ（ｔ２）−Ｒ２
ところで、放射線厚さ計の測定信号の中に含まれている
温度外乱による成分には、先に説明した通り、ギャップ
の温度によるものと、検出上・下ヘッドの箱内の温度（
外気温度）によるものがあり、これらの成分の比率は実
験的に求めることができる性質のものである。Et=Ett-Rt2 (1) However, Etl: Electromotive force of the thermocouple corresponding to the hot junction temperature t1 E1 □: Electromotive force of the thermocouple corresponding to the cold junction temperature t2 However, f(tl) - El g(t2 )-R2 By the way, as explained earlier, the components due to temperature disturbance contained in the measurement signal of the radiation thickness meter include those due to the temperature of the gap and the temperature inside the box of the upper and lower detection heads (
The ratio of these components can be determined experimentally.
一方、（３）式より明らかなように、出力回路３の出力
信号Ｅ。On the other hand, as is clear from equation (3), the output signal E of the output circuit 3.
には、外気温度およびギャップ温度に関する成分が含ま
れており、しかも両者の比率を、出力回路３をなす抵抗
Ｒ１，Ｒ２，Ｒ３および電源Ｅｓを選んで決めることが
できるので、信号Ｅ。The signal E contains components related to the outside temperature and the gap temperature, and the ratio of the two can be determined by selecting the resistors R1, R2, R3 forming the output circuit 3 and the power source Es.
の中でのそれぞれの成分の比率を容易に決めることがで
きる。The ratio of each component can be easily determined.
したがって、前記した２種の温度外乱による測定値の変
動分の中で占める両成分の比率にあわせて、抵抗Ｒ１，
Ｒ２，Ｒ３およびＥｓの値を定めやれば、信号Ｅｏの特
性を測定値の変動分に対応させることができ、信号Ｅ。Therefore, the resistance R1,
By determining the values of R2, R3, and Es, the characteristics of the signal Eo can be made to correspond to the fluctuations in the measured value.
で温度補償演算をなすことができる。Temperature compensation calculations can be performed using
なお、上記実施例において、熱電対の冷接点を検出上ヘ
ッドの箱内に設けたが、本考案はこれに限定するもので
はない。In the above embodiment, the cold junction of the thermocouple was provided inside the box of the head for detection, but the present invention is not limited to this.
検出下ヘッドの箱内に設けてもよいし、検出上・下ヘッ
ドの両方に設けてもよい。It may be provided in the box of the lower detection head, or may be provided in both the upper and lower detection heads.
また、測温抵抗体に代えてサーミスタやシリコン抵抗等
、他の温度感応素子を用いてもよい。Further, other temperature sensitive elements such as a thermistor or a silicon resistor may be used in place of the temperature measuring resistor.
以上、説明したように、本考案は検出上・下ヘッドの箱
内の温度検出を、ギャップ温度を検出する熱電対の冷接
点検出用素子でなすようにしているため、簡単な回路構
成で温度補償用の信号を得ることができる。As explained above, the present invention detects the temperature inside the box of the upper and lower detection heads using the cold junction detection element of the thermocouple that detects the gap temperature, so the temperature can be detected with a simple circuit configuration. A signal for compensation can be obtained.
図は本考案の一実施例による放線線厚さ計の検出上・下
ヘッドの構成説明図である。
１・・・・・・検出上ヘッド、１１・・・・・・電離箱
、１２・・・・・・入射窓、１３・・・・・・熱電対、
１４・・・・・・基盤、２・・・・・・検出下ヘッド、
２１・・・・・・放射線源、２２・・・・・・照射窓、
３・・・・・・出力回路。The figure is an explanatory diagram of the configuration of the upper and lower detection heads of the radiation thickness meter according to an embodiment of the present invention. 1...Detection head, 11...Ionization chamber, 12...Incidence window, 13...Thermocouple,
14...Base, 2...Detection head,
21...Radiation source, 22...Irradiation window,
3... Output circuit.
Claims (2)
、シート状物体を挿入してその物体の物理量を測定する
装置において、そのギャップに熱接点を有し、かつ前記
検出上・下ヘッドのいずれか一方、又は双方の箱内に冷
接点を有する熱電対と、その冷接点の温度を検出し、そ
の温度に対応する信号を得ると共に、その信号および前
記熱電対の起電力個々に、あらかじめ定めた比率を乗じ
たものを加算して出力する手段とからなり、その出力を
温度補償用の信号として次段に送出する温度補償手段を
具えた放射線厚さ計。(1) In a device that measures the physical quantity of a sheet-like object by inserting it into a gap formed by disposing upper and lower detection heads facing each other, the gap has a thermal contact point, and the upper and lower detection heads A thermocouple having a cold junction in one or both of the boxes of the head detects the temperature of the cold junction, obtains a signal corresponding to the temperature, and separately calculates that signal and the electromotive force of the thermocouple. , a means for adding and outputting the result multiplied by a predetermined ratio, and a temperature compensating means for transmitting the output as a temperature compensating signal to the next stage.
なすブリッジ回路力】らなり、そのブリッジ回路の出力
信号に、前記熱電対の起電力を重畳させてなる実用新案
登録請求の範囲第１項の温度補償手段を具えた放射線厚
さ計。(2) The cold junction temperature detection means consists of a bridge circuit whose one side is a resistance temperature detector, and the electromotive force of the thermocouple is superimposed on the output signal of the bridge circuit. A radiation thickness meter equipped with temperature compensation means in the first range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6048578U JPS5932882Y2 (en) | 1978-05-04 | 1978-05-04 | Radiation thickness gauge with temperature compensation means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6048578U JPS5932882Y2 (en) | 1978-05-04 | 1978-05-04 | Radiation thickness gauge with temperature compensation means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54163666U JPS54163666U (en) | 1979-11-16 |
| JPS5932882Y2 true JPS5932882Y2 (en) | 1984-09-14 |
Family
ID=28961034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6048578U Expired JPS5932882Y2 (en) | 1978-05-04 | 1978-05-04 | Radiation thickness gauge with temperature compensation means |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5932882Y2 (en) |
-
1978
- 1978-05-04 JP JP6048578U patent/JPS5932882Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54163666U (en) | 1979-11-16 |
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