JPS61132830A - Liquid temperature sensor - Google Patents

Liquid temperature sensor

Info

Publication number
JPS61132830A
JPS61132830A JP59254673A JP25467384A JPS61132830A JP S61132830 A JPS61132830 A JP S61132830A JP 59254673 A JP59254673 A JP 59254673A JP 25467384 A JP25467384 A JP 25467384A JP S61132830 A JPS61132830 A JP S61132830A
Authority
JP
Japan
Prior art keywords
liquid crystal
temp
light
light source
temperature
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
Application number
JP59254673A
Other languages
Japanese (ja)
Inventor
Toshio Fuchi
渕　登志男
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP59254673A priority Critical patent/JPS61132830A/en
Publication of JPS61132830A publication Critical patent/JPS61132830A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
    • G01K11/16—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials
    • G01K11/165—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials of organic liquid crystals

Abstract

PURPOSE:To reduce the weight and size of a device and to permit sensing of whether a prescribed temp. range is attained or not by discriminating the light transmission characteristic changing with the temp. of a liquid crystal in a liquid crystal temp. sensor having a cholesteric liquid crystal. CONSTITUTION:The temp. sensor is constituted of a light source 1 whicb is a light emitting diode or white lamp having a prescribed wavelength characteristic, a liquid crystal cell 2 contg. a cholesteric liquid crystal, an optical filter 3 having a prescribed wavelength characteristic, a photodetector 4 such as phototransistor and a temp. discriminating circuit 7, etc. The photodetection signal taken out of both ends of load resistor 6 by making use of the phenomenon in which the overall wavelength of the light source 1, the filter 3 and the photodetector 4 does not depend on temp. and in which the light transmittability of the liquid crystal 2 changes with temp. is subjected to data processing in the circuit 7 to know the environmental temp. range to which the liquid crystal 2 is subjected to exist. Constituting parts are thereby decreased and the very small temp. change is sensed with high sensitivity.

Description

【発明の詳細な説明】 く技術分野〉 本宛廚は、コレステリンク液晶の温度変化による呈色現
象を利用した液晶温度感知装置に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field This article relates to a liquid crystal temperature sensing device that utilizes the coloring phenomenon of cholesteric liquid crystal due to temperature changes.

〈従来技術〉 コレステリック液晶は温度に応じて透過光が変化する現
象が知られている。<Prior Art> It is known that cholesteric liquid crystals exhibit a phenomenon in which transmitted light changes depending on temperature.

〈発明の目的〉 本発明は、所定の温度範囲に達したか否かを感知するこ
とができ、かつ、軽量で小型の温度感知装置を提供する
ことを目的とする。<Object of the Invention> An object of the present invention is to provide a light and small temperature sensing device that can sense whether a predetermined temperature range has been reached.

〈発明の構成〉 本発明の液晶温度感知装置は、温度特性を有する液晶と
、その液晶を照射する光源と、液晶の透過光を受光する
受光素子と、上記光源と上記受光素子の間に挿入された
色フィルタを有し、上記受光素子の出力により液晶温度
が所定の範囲内にあるか否かを感知するよう構成された
ことを特徴としている。<Configuration of the Invention> The liquid crystal temperature sensing device of the present invention includes a liquid crystal having temperature characteristics, a light source that illuminates the liquid crystal, a light receiving element that receives transmitted light from the liquid crystal, and a liquid crystal that is inserted between the light source and the light receiving element. The liquid crystal display device is characterized in that it has a color filter, and is configured to detect whether the liquid crystal temperature is within a predetermined range based on the output of the light receiving element.

〈実施例〉 第１図に本発明の一実施例を示す。図において１は所定
の波長特性をもつ光源で、例えば発光ダイオード、又は
白色ランプ、２ばコレステリック液晶を含む液晶セル、
３は所定の波長特性をもつ光学フィルタ、４はフォトト
ランジスタ等の受光素子、５は直流電源、６は負荷抵抗
であって、この両端から受光信号が取り出され、温度判
別回路７に導入されてデータ処理される。<Example> FIG. 1 shows an example of the present invention. In the figure, 1 is a light source with predetermined wavelength characteristics, such as a light emitting diode or a white lamp, 2 is a liquid crystal cell containing cholesteric liquid crystal,
3 is an optical filter having predetermined wavelength characteristics, 4 is a light receiving element such as a phototransistor, 5 is a DC power supply, and 6 is a load resistor, from which a light receiving signal is taken out from both ends and introduced into a temperature discrimination circuit 7. Data is processed.

このような装置において、光源１、光学フィルタ３、及
び受光素子４の総合的波長特性は温度に依存すず、コレ
ステリンク液晶２の光透過特性が温度により変化するか
ら、出力信号により液晶が置かれた環境温度がどの範囲
に属するかを知ることができる。In such a device, the overall wavelength characteristics of the light source 1, optical filter 3, and light receiving element 4 depend on the temperature, and the light transmission characteristics of the cholesteric liquid crystal 2 change depending on the temperature. You can know to which range the environmental temperature belongs.

第２図に本発明の他の実施例を示す。１個の光源１と１
個の液晶セル２に対し、それぞれ波長特性の異る３種の
光学フーイルタ、例えば赤色選択透過フィルタ３Ａ、橙
色選択透過フィルタ３Ｂ、黄色選択透過フィルタ３Ｃを
並設し、各フィルタごとに受光素子４Ａ、４Ｂ、４Ｃ，
を設け、各出力信号を温度判別回路７に導入している。FIG. 2 shows another embodiment of the invention. 1 light source 1 and 1
For each liquid crystal cell 2, three types of optical filters each having different wavelength characteristics, such as a red selective transmission filter 3A, an orange selective transmission filter 3B, and a yellow selective transmission filter 3C, are arranged in parallel, and a light receiving element 4A is arranged for each filter. , 4B, 4C,
is provided, and each output signal is introduced into the temperature discrimination circuit 7.

液晶として、コレステリルナノエート／アミルオキシ安
息香酸ブチルオキシジフェニルエステルｆｆｉ合物を用
いたところ、第３図に示すように、液晶の環境温度が１
６°Ｃから４０″Ｃに変化するとき、それに対応して、
紫外光から紫、青、緑、黄、橙、赤、赤外光まで透過光
が連続的に変色し、各受光信号の変化から温度範囲を２
°、Ｃ刻みの分解能で識別することができた。When a cholesteryl nanoate/amyloxybenzoic acid butyloxydiphenyl ester ffi compound was used as the liquid crystal, as shown in Figure 3, the environmental temperature of the liquid crystal was 1.
When changing from 6°C to 40″C, correspondingly,
The transmitted light changes color continuously from ultraviolet light to violet, blue, green, yellow, orange, red, and infrared light, and the temperature range can be divided into two depending on the change in each light reception signal.
It was possible to identify them with a resolution of ° and C increments.

く効果〉 本発明によれば、少ない構成部品による簡単な構成で、
小型軽量ながら、微小な温度変化を高精度に感知するこ
とができ、例えばター子等の温度制御に応用することも
できる。Effects> According to the present invention, with a simple configuration using fewer components,
Although it is small and lightweight, it can sense minute temperature changes with high precision, and can be applied to temperature control of turbines, etc., for example.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明実施例の構成図、第２図は本発明の他の
実施例の構成図、第３図は第２図に示す実施例の特性図
である。 １−・光源 ２−・液晶セル ３．３Ａ、３Ｂ、３Ｃ・−・光学フィルタ４．４Ａ、４
Ｂ、４Ｃ−・受光素子 ７−−−−一温度判別回路FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of another embodiment of the present invention, and FIG. 3 is a characteristic diagram of the embodiment shown in FIG. 1-・Light source 2-・Liquid crystal cell 3.3A, 3B, 3C・-・Optical filter 4.4A, 4
B, 4C-・Light receiving element 7----1 Temperature discrimination circuit

Claims (1)

【特許請求の範囲】[Claims] 温度特性を有する液晶と、その液晶を照射する光源と、
液晶の透過光を受光する受光素子と、上記光源と上記受
光素子の間に挿入された色フィルタを有し、上記受光素
子の出力により液晶温度が所定の範囲内にあるか否かを
感知するよう構成されたことを特徴とする液晶温度感知
装置。A liquid crystal with temperature characteristics, a light source that illuminates the liquid crystal,
It has a light receiving element that receives light transmitted through the liquid crystal, and a color filter inserted between the light source and the light receiving element, and detects whether the liquid crystal temperature is within a predetermined range based on the output of the light receiving element. A liquid crystal temperature sensing device characterized by being configured as follows.
JP59254673A 1984-11-30 1984-11-30 Liquid temperature sensor Pending JPS61132830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59254673A JPS61132830A (en) 1984-11-30 1984-11-30 Liquid temperature sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59254673A JPS61132830A (en) 1984-11-30 1984-11-30 Liquid temperature sensor

Publications (1)

Publication Number Publication Date
JPS61132830A true JPS61132830A (en) 1986-06-20

Family

ID=17268271

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59254673A Pending JPS61132830A (en) 1984-11-30 1984-11-30 Liquid temperature sensor

Country Status (1)

Country Link
JP (1) JPS61132830A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63163236A (en) * 1986-12-26 1988-07-06 Matsushita Electric Ind Co Ltd Optical temperature sensor
US20110310926A1 (en) * 2009-02-27 2011-12-22 Syngenta Crop Protection Llc Sensor
CN108681346A (en) * 2018-05-14 2018-10-19 杨松 Temperature electronic switchs and its method of switching

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63163236A (en) * 1986-12-26 1988-07-06 Matsushita Electric Ind Co Ltd Optical temperature sensor
US20110310926A1 (en) * 2009-02-27 2011-12-22 Syngenta Crop Protection Llc Sensor
US9016937B2 (en) * 2009-02-27 2015-04-28 Syngenta Limited Sensor
CN108681346A (en) * 2018-05-14 2018-10-19 杨松 Temperature electronic switchs and its method of switching

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