JPH01110217A - Displacement sensor - Google Patents
Displacement sensorInfo
- Publication number
- JPH01110217A JPH01110217A JP62266425A JP26642587A JPH01110217A JP H01110217 A JPH01110217 A JP H01110217A JP 62266425 A JP62266425 A JP 62266425A JP 26642587 A JP26642587 A JP 26642587A JP H01110217 A JPH01110217 A JP H01110217A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- displacement
- angle
- rotation
- plastic optical
- 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
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract 5
- 229920005989 resin Polymers 0.000 claims abstract 5
- 239000013308 plastic optical fiber Substances 0.000 claims description 17
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims 1
- 229920000178 Acrylic resin Polymers 0.000 claims 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 1
- 238000005253 cladding Methods 0.000 claims 1
- 230000008602 contraction Effects 0.000 claims 1
- 229910052731 fluorine Inorganic materials 0.000 claims 1
- 239000011737 fluorine Substances 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 229920001187 thermosetting polymer Polymers 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000005305 interferometry Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は変位センサに関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to a displacement sensor.
光ファイバを用いた従来の変位計測装置は例えば文献光
を使ったプロセス量測定の将来（ｐ２２５〜）電気書院
発行「電気計算」臨時増刊「わかる光フアイバ応用技術
）昭和５７年６月２５日発行に見られるように石英系の
シングルモードファイバを用い、干渉法により変位の計
測を行なっていた。Conventional displacement measuring devices using optical fibers can be used, for example, in the following literature: Future of Process Quantity Measurement Using Light (p. 225~) Denki Shoin, ``Electrical Calculation'' Special Issue ``Understanding Optical Fiber Application Technology'', published June 25, 1982. As shown in , displacement was measured by interferometry using a quartz-based single-mode fiber.
上記従来技術では干渉法を利用するため次の問題があっ
た。The above-mentioned conventional technology has the following problems because it uses interferometry.
１、装置全体が複雑となる。1. The entire device becomes complicated.
２、シングルモードファイバを用いるため光源との結合
に注意する必要がある。2. Since a single mode fiber is used, care must be taken regarding coupling with the light source.
３、光を分波２合波する必要があるためハーフミラ−等
の光学部品が必要となる。3. Since it is necessary to split and combine the light into two, optical components such as a half mirror are required.
本発明の目的は上記の問題を解決し低コストで精度の高
い変位センサを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a low-cost, highly accurate displacement sensor.
上記目的は次の技術手段を採用することにより、達成さ
れる。The above objective is achieved by adopting the following technical means.
１、干渉法を利用せずプラスチック光ファイバの透過電
力を直接測定する。1. Directly measure the transmitted power of a plastic optical fiber without using interferometry.
２、光の伝送体であるプラスチック光ファイバは注型重
合によりカール状、あるいはうす巻き状にする。2. Plastic optical fibers, which are light transmitters, are made into a curled or thinly wound shape by cast polymerization.
前記１の技術手段は装置全体を簡単かつ低コスト化する
働きを持つ。The above-mentioned technical means 1 has the function of simplifying and reducing the cost of the entire device.
前記２の技術手段は、注型重合によりカール状あるいは
うず巻き状に作られたプラスチック光ファイバではその
作られた状態が伝送特性上最も安定である。この状態に
変位を加えると光弾性効果により、歪が加わっている部
分の屈折率が変わる。According to the second technical means, when a plastic optical fiber is made into a curled or spiral shape by cast polymerization, the state in which it is made is the most stable in terms of transmission characteristics. When displacement is applied to this state, the refractive index of the strained portion changes due to the photoelastic effect.
従って光の導波形態が変わり、光の一部が放射されその
結果透過電力が変化（減少）する。すなわちカール状、
あるいはうす巻き状のプラスチック光フアイバ自身が変
位に対するセンサーの働きを持つ。Therefore, the waveguide form of the light changes, and part of the light is emitted, resulting in a change (reduction) in the transmitted power. In other words, curly,
Alternatively, the thinly wound plastic optical fiber itself acts as a sensor for displacement.
以下、本発明の一実施例を第１図により説明する。第１
図では回転角を検出するため、プラスチック光ファイバ
を、回転角を検出したい回転体のまわりにうす巻き状に
設置されている。プラスチック光ファイバの一端には光
源、他端には光検出器が設けられている。回転体が右に
廻ればプラスチック光ファイバは巻かれ左に廻れば巻き
戻されるようになっている。An embodiment of the present invention will be described below with reference to FIG. 1st
In the figure, in order to detect the rotation angle, a plastic optical fiber is installed in a thinly wound shape around the rotating body whose rotation angle is to be detected. A light source is provided at one end of the plastic optical fiber, and a photodetector is provided at the other end. When the rotating body turns to the right, the plastic optical fiber is wound, and when it turns to the left, it is unwound.
次に動作を説明する。プラスチック光ファイバはうす巻
き状に注型により作られている。この状態を回転角零度
にセットしておく。回転体が右及び左に廻った時、光フ
ァイバには変位による歪が加わることになる。従って回
転体の回転角度に応じて光弾性効果により透過電力が減
少することになる。予かしめ透過電力と回転角を校正し
ておけば透過電力より回転角がわかる。また回転体を零
度に戻せばプラスチック光ファイバは自身のバネの力で
もとにもどる。Next, the operation will be explained. Plastic optical fiber is made by casting into a thinly wound shape. Set this state to zero rotation angle. When the rotating body rotates to the right and left, strain is applied to the optical fiber due to the displacement. Therefore, the transmitted power decreases due to the photoelastic effect depending on the rotation angle of the rotating body. If the transmission power and rotation angle are calibrated in advance, the rotation angle can be determined from the transmission power. Furthermore, when the rotating body is returned to zero, the plastic optical fiber returns to its original state with its own spring force.
本実施例特有の効果としては回転体の角度が簡単な光学
系とプラスチック光ファイバを用いて、迅速にかつ高精
度がわかることである。A unique advantage of this embodiment is that it can be quickly and accurately determined by using an optical system with a simple rotating body angle and a plastic optical fiber.
第１図では回転角センサの実施例を示した。同様の原理
で伸びセンサに応用した場合を第２図に示す。可動部分
にカール状のプラスチック光ファイバが取りつけられて
おり、可動部分の伸びが直接カール状のプラスチック光
ファイバに印加される。プラスチック光ファイバが伸ば
されると伸び歪が印加され光弾性効果により屈折率が変
化し光ファイバを導波する光の一部が放射する。従って
予じめ伸びと透過電力を校正しておくことで可動部分の
伸びが測定できる。FIG. 1 shows an embodiment of the rotation angle sensor. Figure 2 shows a case where the same principle is applied to a stretch sensor. A curled plastic optical fiber is attached to the movable part, and the elongation of the movable part is directly applied to the curled plastic optical fiber. When a plastic optical fiber is stretched, elongation strain is applied, the refractive index changes due to the photoelastic effect, and a portion of the light guided through the optical fiber is emitted. Therefore, by calibrating the elongation and transmitted power in advance, the elongation of the movable part can be measured.
本発明により次の効果がある。 The present invention has the following effects.
１、システムの構成が簡単なため低コスト化になる。1. The system configuration is simple, resulting in lower costs.
２、太コア径のプラスチック光ファイバを用いるため光
源との結合は容易である。2. Since a plastic optical fiber with a large core diameter is used, coupling with a light source is easy.
３、構成が簡単なため長期の信頼性が高い。3. High long-term reliability due to simple configuration.
第１図は回転角センサ、第２図は伸びセンサの模式図で
ある。
１・・パブラスチック光ファイバ、２・・・回転体、３
・・・光源、４・・・受光器、訃・・移動体。FIG. 1 is a schematic diagram of a rotation angle sensor, and FIG. 2 is a schematic diagram of an elongation sensor. 1...Publastic optical fiber, 2...Rotating body, 3
...Light source, 4...Light receiver, Death...Moving object.
Claims (1)
状のプラスチック光ファイバにおいて、これに伸縮等の
変位を印加した時に生ずる透過光の変化を利用した変位
センサ。 ２、前記においてプラスチック光ファイバは架橋アクリ
ル系樹脂をコア、フッ素系樹脂をクラッドとする熱硬化
型樹脂から成ることを特徴とする特許請求の範囲第１項
記載の変位センサ。 ３、前記においてプラスチック光ファイバに光弾性係数
０．１ｔｒｎｍ／ｋｇ以上の材料を用いたことを特徴と
する特許請求の範囲第１項記載の変位センサ。[Claims] 1. A displacement sensor that utilizes changes in transmitted light that occur when a displacement such as expansion or contraction is applied to a curled or spiral-shaped plastic optical fiber made by cast polymerization. 2. The displacement sensor according to claim 1, wherein the plastic optical fiber is made of a thermosetting resin having a core made of a crosslinked acrylic resin and a cladding made of a fluorine resin. 3. The displacement sensor according to claim 1, wherein a material having a photoelastic coefficient of 0.1 trnm/kg or more is used for the plastic optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62266425A JPH01110217A (en) | 1987-10-23 | 1987-10-23 | Displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62266425A JPH01110217A (en) | 1987-10-23 | 1987-10-23 | Displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01110217A true JPH01110217A (en) | 1989-04-26 |
Family
ID=17430758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62266425A Pending JPH01110217A (en) | 1987-10-23 | 1987-10-23 | Displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01110217A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024527A (en) * | 2005-07-12 | 2007-02-01 | Fiberlabs Inc | Optical fiber sensor and sensor system |
| WO2019212048A1 (en) | 2018-05-04 | 2019-11-07 | 株式会社シミウス | Open/close detection sensor |
-
1987
- 1987-10-23 JP JP62266425A patent/JPH01110217A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024527A (en) * | 2005-07-12 | 2007-02-01 | Fiberlabs Inc | Optical fiber sensor and sensor system |
| WO2019212048A1 (en) | 2018-05-04 | 2019-11-07 | 株式会社シミウス | Open/close detection sensor |
| US10830944B2 (en) | 2018-05-04 | 2020-11-10 | Cmiws Co., Ltd. | Opening and closing detection sensor |
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