JPH01237424A - Optical temperature sensor - Google Patents
Optical temperature sensorInfo
- Publication number
- JPH01237424A JPH01237424A JP6394888A JP6394888A JPH01237424A JP H01237424 A JPH01237424 A JP H01237424A JP 6394888 A JP6394888 A JP 6394888A JP 6394888 A JP6394888 A JP 6394888A JP H01237424 A JPH01237424 A JP H01237424A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- temperature
- crystal plate
- plate
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims description 14
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 37
- 238000002834 transmittance Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 abstract description 14
- 239000011521 glass Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000013307 optical fiber Substances 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は加熱温度を遠隔地で検出する光温度センサに関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical temperature sensor for remotely detecting heating temperature.
従来の技術
従来、この種の光温度センサは、第６図に示す２ ・＼
−７
ようガ構成であった。第６図において、１ａ、１ｂは光
ファイバ、２ａ 、２ｂはロッドレンズ、３は光の遮蔽
板、４はコイル形状の形状記憶合金、６はバネである。Conventional technology Conventionally, this type of optical temperature sensor is shown in Fig. 6.
-7 It had a similar structure. In FIG. 6, 1a and 1b are optical fibers, 2a and 2b are rod lenses, 3 is a light shielding plate, 4 is a coil-shaped shape memory alloy, and 6 is a spring.
同図において、光ファイバ１＆から出射した光は、ロッ
ドレンズ２ａで平行光線６に変換され、遮蔽板３に設け
られた孔７を通過したのち、ロッドレンズ２ｂで再び集
光され、光ファイバ１ｂに入射する。測定温度が上昇す
ると形状記憶合金で作られたバネ４が例えば縮むために
、遮蔽板３が平行光線６を遮蔽し、光ファイバ１ｂへ光
が入射しない。測定温度が下降すると、形状記憶合金４
の縮む力が無くなり、バネ６が縮むことにより遮蔽板３
が元の位置に戻るので、平行光線６は再び孔７を通過し
、光ファイバ１ｂに入射する。In the figure, the light emitted from the optical fiber 1& is converted into parallel light rays 6 by the rod lens 2a, passes through the hole 7 provided in the shielding plate 3, and is again condensed by the rod lens 2b. incident on . When the measurement temperature rises, the spring 4 made of a shape memory alloy, for example, contracts, so the shielding plate 3 blocks the parallel light rays 6, and no light enters the optical fiber 1b. When the measured temperature decreases, the shape memory alloy 4
The force to contract is lost, and the spring 6 contracts, causing the shielding plate 3 to
returns to its original position, so the parallel light ray 6 passes through the hole 7 again and enters the optical fiber 1b.
発明が解決しようとする課題
このような従来の構成では、遠隔地で被測定物の温度を
検出するために、被測定物との間に光ファイバ１＆、１
１）配線する必要があり、また特に高電圧部の温度測定
では、光ファイバ１ａ、１ｂ３ ・
の外被を伝わる電気の漏れ（リーク）が発生ずる問題点
があった。本発明は、このような問題点を解決するもの
で、被測定物の温度を簡単な構成で、非接触に検出でき
る光温度センサを提供することを目的としたものである
。Problems to be Solved by the Invention In such a conventional configuration, in order to detect the temperature of the object to be measured at a remote location, optical fibers 1 and 1 are connected to the object to be measured.
1) Wiring is required, and especially when measuring the temperature of a high voltage section, there is a problem in that electricity leaks through the outer sheath of the optical fibers 1a, 1b3. The present invention has been made to solve these problems, and aims to provide an optical temperature sensor that can detect the temperature of an object to be measured in a simple and non-contact manner.
課題を解決するだめの手段
本発明は上記問題点を解決するために、入射した光とお
およそ同じ方向に光を反射する反射部の前面に、一定値
の温度を境として、光の波長透過率特性が変化する（例
えば赤い光だけを透過していたものが青い光だけを透過
するように変化する）光の通過部材を設けて温度センサ
を構成するものである。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a structure in which the wavelength transmittance of light is set at a certain temperature on the front surface of a reflecting part that reflects light in approximately the same direction as the incident light. A temperature sensor is constructed by providing a light passing member whose characteristics change (for example, from transmitting only red light to transmitting only blue light).
作用
本発明は上記した構成により、離れた場所にある特定波
長の光を放射する光源から出射した光を入射させ、光温
度センサの反射部による光の反射の有無を、光源の近傍
にある受光部で検出することで、一定温度状態が検出で
き、優れた光温度センサどして機能する。Effect of the Invention With the above-described configuration, the present invention allows light emitted from a light source that emits light of a specific wavelength to be incident at a remote location, and detects whether or not the light is reflected by the reflecting part of the optical temperature sensor by detecting the light received near the light source. By detecting the temperature at a certain point, it is possible to detect a constant temperature state, and it functions as an excellent optical temperature sensor.
実施例
第１図は本発明の一実施例による光温度センサの構成図
である。第１図において、８はガラス板の中に液晶材料
を封入した液晶板、９は光の反射板、１０は離れた位置
に設けた発光部、１２は発光部からの出射光を示す矢印
、１１は受光部、１３は受光部１１に入射する反射光を
示す矢印である。Embodiment FIG. 1 is a configuration diagram of an optical temperature sensor according to an embodiment of the present invention. In FIG. 1, 8 is a liquid crystal plate in which a liquid crystal material is sealed in a glass plate, 9 is a light reflecting plate, 10 is a light emitting part provided at a distant position, 12 is an arrow indicating the light emitted from the light emitting part, 11 is a light receiving section, and 13 is an arrow indicating reflected light incident on the light receiving section 11.
以下、その構成および動作を第２図と第３図を併用して
説明する。液晶板８は反射板９の前面に設けられている
。反射板９は入射した光とほとんど同じ角度で、逆向き
に光を反射する機能を持つ。Hereinafter, its configuration and operation will be explained with reference to FIGS. 2 and 3. The liquid crystal plate 8 is provided in front of the reflective plate 9. The reflecting plate 9 has a function of reflecting light in the opposite direction at almost the same angle as the incident light.
第２図にこの反射板９の構成の説明図を示す。同図（ａ
）は反射板９０反射面の図を示したもので、互いに直角
な３つの反射平面から成る反射部１４を複数個同一平面
に配置したものである。同図（ｂ）はこの反射部１４の
光の反射の様子を示す図で、入射光１２は反射部１４の
内部で完全反射を３回行い、入射光１２に対して１８０
度の偏光角て出射し、反射光１３となる。この動作は入
射光１２の入射角に全く依存せず、光の入射方向に必ず
反射する。FIG. 2 shows an explanatory diagram of the structure of this reflecting plate 9. The same figure (a
) shows a view of the reflecting surface of the reflecting plate 90, in which a plurality of reflecting parts 14 each consisting of three reflecting planes perpendicular to each other are arranged on the same plane. FIG. 3B is a diagram showing how light is reflected by the reflecting section 14. The incident light 12 is completely reflected three times inside the reflecting section 14, and the incident light 12 has a 180%
The light is emitted with a polarization angle of 100 degrees, and becomes reflected light 13. This operation is completely independent of the angle of incidence of the incident light 12, and the light is always reflected in the direction of incidence.
次に、液晶板８は、光をほとんど損失なく通過するガラ
ス板の内部に液晶材料を封入したもので、液晶は第３図
（２Ｌ）の液晶特性の説明図に示すように、一定の温度
１６を境にして、光の波長透過率が変化する特性を持つ
。まだ、同図（ｂ）に示すように、温度状態により、液
晶の波長透過特性が異なり、一定の温度より液晶の温度
が低い時は赤色光を透過し、液晶の温度が高い時は青色
光を透過するが赤色光は遮蔽する。Next, the liquid crystal plate 8 is a glass plate in which a liquid crystal material is sealed inside which allows light to pass through with almost no loss. 16, the wavelength transmittance of light changes. However, as shown in Figure (b), the wavelength transmission characteristics of the liquid crystal differ depending on the temperature state; when the liquid crystal temperature is lower than a certain temperature, red light is transmitted, and when the liquid crystal temperature is high, blue light is transmitted. It transmits light, but blocks red light.
再び第１図に戻って説明を続ける。液晶板８の温度が第
３図に示す一定温度１６以下の時、液晶板８は赤色光１
２を透過するので、任意の位置に設けた発光部１０から
出射した赤色光１２は、液晶板８を通過し、反射板９で
反射され、再び液晶板８を通過し、反射光１３は発光部
１０の近傍に設けた受光部１１に入射する。Returning to FIG. 1 again, the explanation will be continued. When the temperature of the liquid crystal plate 8 is below the constant temperature 16 shown in FIG. 3, the liquid crystal plate 8 emits red light 1.
2, the red light 12 emitted from the light emitting unit 10 provided at an arbitrary position passes through the liquid crystal plate 8, is reflected by the reflection plate 9, and passes through the liquid crystal plate 8 again, and the reflected light 13 is emitted. The light enters a light receiving section 11 provided near the section 10.
液晶板８の温度が一定値以」二になると、液晶板８は赤
色光を透過しないため、発光部１０から出６・＼−７
射した光１２は液晶板８内で吸収寸だは散乱され、液晶
板８を通過することができない。When the temperature of the liquid crystal plate 8 reaches a certain value or less, the liquid crystal plate 8 does not transmit red light, so the light 12 emitted from the light emitting part 10 is absorbed or scattered within the liquid crystal plate 8. and cannot pass through the liquid crystal plate 8.
以上の動作より、液晶板８および反射板９がら成る温度
センサに、外部より入射させた赤色光１２の反射の有無
を、受光部１１で検出することにより、被測定物の温度
を検出することができる。According to the above operation, the temperature of the object to be measured can be detected by detecting with the light receiving section 11 whether or not the red light 12 incident from the outside is reflected on the temperature sensor consisting of the liquid crystal plate 8 and the reflection plate 9. Can be done.
第４図は、本発明の他の実施例による構成図を示す。第
４図において、１６は一定温度を境にして光の波長透過
率特性が変化する液晶材料、１７はその中に液晶材料１
６を封入した光をほとんど損失々〈通過させるガラス板
、１２および１３は各々光の入射光および反射光を表す
矢印で、１８はガラス板１７０片方の面に一体に設けた
光の反射部で、１つまたは複数個の、互いに直角な３つ
の平面をもつプリズム（コーナーキューブ）部ヲ一体に
構成したものである。FIG. 4 shows a block diagram according to another embodiment of the present invention. In FIG. 4, 16 is a liquid crystal material whose wavelength transmittance characteristics change at a certain temperature, and 17 is a liquid crystal material 1 inside it.
6 is a glass plate that allows the enclosed light to pass through with almost no loss, 12 and 13 are arrows representing incident light and reflected light, respectively, and 18 is a light reflecting part integrally provided on one surface of the glass plate 170. , one or more prisms (corner cubes) having three planes perpendicular to each other are integrally constructed.
赤色光１２は、温度に依存する液晶材料１６の光波長透
過率の変化に応じて通過し、反射部１８で反射され、反
射光１３となる。この実施例の動作は、第１図に示す実
施例と同じである。異なる７１・−７
のけ、液晶１６と反射部１８との間がガラスで充填され
ており、空気層がないため空気とガラスの境界で光が反
射する損失（フレネル損失）が無く、有効に光を利用で
きること、および光の反射はプリズムの全反射を用いた
ことである。The red light 12 passes through the liquid crystal material 16 in accordance with a temperature-dependent change in the light wavelength transmittance of the liquid crystal material 16 and is reflected by the reflecting section 18 to become reflected light 13. The operation of this embodiment is the same as the embodiment shown in FIG. The space between the liquid crystal 16 and the reflective part 18 is filled with glass, and there is no air layer, so there is no loss (Fresnel loss) caused by light reflection at the boundary between air and glass, and the light is effectively reflected. It is possible to utilize light, and the total reflection of the light is used in a prism.
以上のように本実施例では、簡単な構成で一定値以上の
温度の上昇を、赤色反射光の有無によって検出でき、優
れた光温度センサとして機能する。As described above, this embodiment can detect a rise in temperature above a certain value with a simple configuration based on the presence or absence of red reflected light, and functions as an excellent optical temperature sensor.
なお、本実施例では、一定値温度を境に光の波長透過率
特性が変化する液晶を封入する材料として、ガラスを用
いたが、光がほとんど損失なく通過する材料であれば、
樹脂でも何を用いても良い。In this example, glass was used as the material for enclosing the liquid crystal whose light wavelength transmittance characteristics change after reaching a certain temperature, but any material that allows light to pass through with almost no loss may be used.
Any resin may be used.
捷だ、光の通過部材として、一定値以上の温度で赤色光
の波長透過率が低くなる液晶を用いたが、一定値温度を
境にして特定波長光の透過率が大きく変化するものであ
れば、どのような材料および特性であっても良い。Well, as a light passing material, we used a liquid crystal whose wavelength transmittance for red light decreases at a temperature above a certain value, but even though the transmittance of light at a specific wavelength changes significantly after a certain temperature. For example, any material and properties may be used.
さらに、光を反射する反射部として、本実施例では、互
いに直角に交わる３つの平面を用いて、光の全反射およ
び完全反射を利用して説明したが、入射光とほとんど同
じ方向に光を反射させるものであれば、どのような反射
部を用いても良いことは言うまでもない。Furthermore, in this example, three planes that intersect at right angles to each other are used as the reflecting part that reflects light, and the explanation has been made using total reflection and complete reflection of light, but the light is reflected in almost the same direction as the incident light. Needless to say, any reflecting section may be used as long as it reflects light.
発明の効果
以上のように本発明によれば、光の反射部を用い、反射
光の有無により、被測定物の温度を検出するので、被測
定物との間に、光ファイバ等の配線を必要のないものと
なる。Effects of the Invention As described above, according to the present invention, the temperature of the object to be measured is detected based on the presence or absence of reflected light using a light reflecting section. It becomes unnecessary.
さらに、光の反射部として入射光とほぼ同じ方向に反射
する反射部を用いているので、反射部に入射させる光の
発光部の位置に対する制約が少なく、光軸調整を必要と
しない効果がある。まだ、実施例では赤色光を遮断する
機能として、一定値の温度を境にして赤色光に対する波
長透過率特性が大きく変化する部材（液晶）を用いてい
るため、構成が簡単で、信頼性が高く、小形化できる。Furthermore, since a reflective part that reflects in almost the same direction as the incident light is used as the light reflecting part, there are fewer restrictions on the position of the light emitting part for the light to be incident on the reflective part, and there is an effect that no optical axis adjustment is required. . However, in the example, a material (liquid crystal) whose wavelength transmittance characteristic for red light changes greatly after reaching a certain temperature is used for the function of blocking red light, so the structure is simple and reliable. High and can be made smaller.
第１図は本発明の一実施例による光温度センサの斜視図
、第２図は本発明の一実施例における反射部の構成の説
明図、第３図は一実施例におけるｔ−７
液晶の特性の説明図、第４図は本発明の他の実施例によ
る光温度センサの構成図、第５図は従来の光温度センサ
の斜視図である。
８ ・・・・液晶板、９・・・・・・光の反射板、１ｏ
・・・・・・発光部、１１・・・・・受光部、１２・・
・・出射光を示す矢印、１３・・・・反射光を示す矢印
、１４・・・・反射部、１６・・・・・・任意の一定温
度、１６・・・・・・液晶材料、１７・・・・・ガラス
板、１８・・・・・・光の反射部。
代理人の氏名 弁理士 中 尾敏 男 ほか１名剖Ｃ頚
噺冊（♂）〈−
讐Ｃ塑智鉦（ｆ）〈−
ロニ
ｃｏ ｏ−９二臼３
〉
〔
へFIG. 1 is a perspective view of an optical temperature sensor according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the configuration of a reflecting section in an embodiment of the present invention, and FIG. An explanatory diagram of the characteristics, FIG. 4 is a configuration diagram of an optical temperature sensor according to another embodiment of the present invention, and FIG. 5 is a perspective view of a conventional optical temperature sensor. 8...Liquid crystal plate, 9...Light reflecting plate, 1o
... Light emitting section, 11 ... Light receiving section, 12 ...
...Arrow indicating outgoing light, 13...Arrow indicating reflected light, 14...Reflecting portion, 16...Arbitrary constant temperature, 16...Liquid crystal material, 17 ...Glass plate, 18...Light reflecting part. Name of agent: Patent attorney Toshi Nakao, and one other person
Claims (1)
反射部の前面に設けた一定値の温度を境にして光の波長
透過率特性が変化する光の通過部材とから構成した光温
度センサ。（２）光の通過部材は、一定値の温度を境に
して特定波長光の透過または遮断を行う液晶から構成し
た特許請求の範囲第１項記載の光温度センサ。 （３）反射部は、１組以上の、互いに直角に交わる３つ
の光の反射面から構成した特許請求の範囲第１項または
第２項記載の光温度センサ。[Scope of Claims] (1) A reflecting part that reflects light in substantially the same direction as the incident light, and a light whose wavelength transmittance characteristics change at a certain temperature level provided in front of the reflecting part. A light temperature sensor composed of a passing member. (2) The optical temperature sensor according to claim 1, wherein the light passing member is made of a liquid crystal that transmits or blocks light of a specific wavelength at a certain temperature. (3) The optical temperature sensor according to claim 1 or 2, wherein the reflecting section is composed of one or more sets of three light reflecting surfaces that intersect at right angles to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6394888A JPH01237424A (en) | 1988-03-17 | 1988-03-17 | Optical temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6394888A JPH01237424A (en) | 1988-03-17 | 1988-03-17 | Optical temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01237424A true JPH01237424A (en) | 1989-09-21 |
Family
ID=13244074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6394888A Pending JPH01237424A (en) | 1988-03-17 | 1988-03-17 | Optical temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01237424A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014157115A (en) * | 2013-02-18 | 2014-08-28 | Univ Of Yamanashi | Thermometric method and apparatus with thermosensitive liquid crystal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57108629A (en) * | 1980-12-25 | 1982-07-06 | Omron Tateisi Electronics Co | Detector for heat |
| JPS6090750A (en) * | 1983-09-19 | 1985-05-21 | スティムソナイト・コーポレーション | Retroreflective sheetig and manufacture thereof |
-
1988
- 1988-03-17 JP JP6394888A patent/JPH01237424A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57108629A (en) * | 1980-12-25 | 1982-07-06 | Omron Tateisi Electronics Co | Detector for heat |
| JPS6090750A (en) * | 1983-09-19 | 1985-05-21 | スティムソナイト・コーポレーション | Retroreflective sheetig and manufacture thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014157115A (en) * | 2013-02-18 | 2014-08-28 | Univ Of Yamanashi | Thermometric method and apparatus with thermosensitive liquid crystal |
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