JPS63231246A - Optical fiber sensor - Google Patents
Optical fiber sensorInfo
- Publication number
- JPS63231246A JPS63231246A JP62064840A JP6484087A JPS63231246A JP S63231246 A JPS63231246 A JP S63231246A JP 62064840 A JP62064840 A JP 62064840A JP 6484087 A JP6484087 A JP 6484087A JP S63231246 A JPS63231246 A JP S63231246A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical fiber
- fiber
- light emitting
- light emission
- 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
- 239000013307 optical fiber Substances 0.000 title claims description 34
- 239000000835 fiber Substances 0.000 claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 238000012544 monitoring process Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明の光ファイバセンナは例えば溶液の濃度検出ある
いは、物体の曲率の検出などに適するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The optical fiber sensor of the present invention is suitable for, for example, detecting the concentration of a solution or the curvature of an object.
（従来技術）
光ファイバセンサは第５図に示すように、光ファイバ２
３の一端から光を入射し、同ファイバ２３の他端から出
射する光の量を測定して、その減衰量から曲率、屈折率
、温度等の各種物理量を測定するようにしたものである
。(Prior art) As shown in Fig. 5, the optical fiber sensor has two optical fibers.
3, the amount of light emitted from the other end of the fiber 23 is measured, and various physical quantities such as curvature, refractive index, temperature, etc. are measured from the amount of attenuation.
光ファイバセンサとして従来は第６図に示すようなもが
あった。これはＬＥＤ等の発光素子２１から、フェルー
ル２２を通して光ファイバ？３へ入射された光は、光分
岐器（カブラ）２４を通過後、参照光（モニタ光）と信
号光に分けられ、夫々モニタ光伝送用光ファイバ２５、
信号光伝送用ファイバ２６を通して補正・検出回路２７
へ入射されるようにしたものである。なおモニタ光は検
出値を補正するのに必要なものである。Conventionally, there has been an optical fiber sensor as shown in FIG. Is this an optical fiber from a light emitting element 21 such as an LED, passing through a ferrule 22? After passing through an optical splitter (coupler) 24, the light incident on the optical fiber 3 is divided into a reference light (monitor light) and a signal light, which are then connected to an optical fiber 25 for transmitting the monitor light, respectively.
A correction/detection circuit 27 is passed through the signal light transmission fiber 26.
It is designed so that it is incident on the Note that the monitor light is necessary for correcting the detected value.
この場合、入射光の強さが変化したのでは正確な測定が
できないため、入射光の強さを常に一定に保持すること
が重要である。現状では光源に加わる電圧を一定に保つ
ため、高精度な定圧電源を用いる一方、時々光パワーメ
ーターにより光源の物理量を測定して校正している。In this case, it is important to always keep the intensity of the incident light constant, since accurate measurements cannot be made if the intensity of the incident light changes. Currently, in order to keep the voltage applied to the light source constant, a high-precision constant-voltage power supply is used, and at times an optical power meter is used to measure the physical quantity of the light source and calibrate it.
（従来技術の問題点）
従来の光ファイバセンサでは高精度な定圧電源が必要で
あるが、それは大型で、高価であり、そのわりには光源
そのものの汚れや経年変化による特性劣化などをカバー
することはできない、といった問題がある。(Problems with conventional technology) Conventional optical fiber sensors require a high-precision constant-voltage power supply, which is large and expensive, and it is difficult to compensate for problems such as dirt on the light source itself and deterioration of characteristics due to aging. The problem is that it cannot be done.
また第６図の光ファイバセンサでは、モニタ光を得るた
めには必ずカブラ２４が必要であるが、カブラ２４は製
造が難しく、価格も高いため、現在、期待されている低
価格な光ファイバセンサには応用できなかった。In addition, the optical fiber sensor shown in Fig. 6 always requires a coupler 24 to obtain monitor light, but since the coupler 24 is difficult to manufacture and expensive, it is now possible to use a low-cost optical fiber sensor that is expected to could not be applied to
（発明の目的）
本発明の目的は高精度の測定ができ、しかも安価な光フ
ァイバセンサを提供することにある。(Objective of the Invention) An object of the present invention is to provide an optical fiber sensor that can perform highly accurate measurements and is inexpensive.
（問題点を解決するための手段）
本発明の光ファイバセンナは、光ファイバ透退中の光の
減衰量を測定することにより、ある物理量を検出する光
ファイバセンサにおいて、第１図〜第３図のように発光
部１から放射される光を信号光伝送用ファイバ３で受光
し、同伝送用ファイバ３へ入射できずに漏洩する漏洩光
の光量をモニタし、モニタされた漏洩光により発光部１
から放射される光量が一定となるように発光部１を制御
するか、同伝送用ファイバ３からの出力を発光部１から
放射される光の光量変化に応じて補正するようにしたこ
とを特徴とするものである。(Means for Solving the Problems) The optical fiber sensor of the present invention is an optical fiber sensor that detects a certain physical quantity by measuring the amount of attenuation of light while passing through an optical fiber. As shown in the figure, the light emitted from the light emitting unit 1 is received by the signal light transmission fiber 3, the amount of leaked light that cannot enter the transmission fiber 3 is monitored, and the monitored leaked light emits light. Part 1
The light emitting section 1 is controlled so that the amount of light emitted from the light emitting section 1 is constant, or the output from the transmission fiber 3 is corrected according to the change in the amount of light emitted from the light emitting section 1. That is.
（発明の作用） 第１図は本発明の光ファイバセンサの一実施例である。(Action of invention) FIG. 1 shows an embodiment of the optical fiber sensor of the present invention.
この図において、発光部１から放射される光の一部は信
号光伝送用ファイバ３に入射し、同伝送用ファイバ３内
を伝送されて受光部２に入射し、信号処理部６で処理さ
れて出力される。一方、発光部１から放射されて信号光
伝送用ファイバ３に入射できなかった漏洩光の一部は漏
洩光モニタ部５に入射し、ここでその光の強さに応じた
電気信号に変換される。この電気信号は発光部１にフィ
ードバックされ、発光出力の設定値と比較されて、発光
出力が常に設定値になるよう発光部ｌを制御する。これ
により発光部ｌから放射される光量が常に一定に保持さ
れる。In this figure, a part of the light emitted from the light emitting section 1 enters the signal light transmission fiber 3, is transmitted through the transmission fiber 3, enters the light receiving section 2, and is processed by the signal processing section 6. is output. On the other hand, a part of the leaked light emitted from the light emitting section 1 and not being able to enter the signal light transmission fiber 3 enters the leaked light monitor section 5, where it is converted into an electrical signal according to the intensity of the light. Ru. This electrical signal is fed back to the light emitting section 1, compared with the set value of the light emitting output, and the light emitting section 1 is controlled so that the light emitting output is always at the set value. As a result, the amount of light emitted from the light emitting section l is always kept constant.
（実施例１） 第２図は本発明の光ファイバセンサの一実施例である。(Example 1) FIG. 2 shows an embodiment of the optical fiber sensor of the present invention.
この光ファイバセンサは、発光部１から放射された光の
一部が信号光伝送用ファイバ３に入射し、同伝送用光フ
ァイバ３内を伝送されて受光部２に入射し、信号処理部
６で処理されて出力され、発光部１から放射されて同伝
送用光ファイバ３に入射しなかった漏洩光の一部は漏洩
光七二り部５に入射し、そこでその光の強さに応じた電
気信号に変換され、この電気信号が信号処理部６へ送ら
れ、そこで初期設定値（発光部ｌから発光される光の物
理量が適正なときの値）と比較され、その差分だけ受光
部２の出力を補正するようにしたものである。In this optical fiber sensor, a part of light emitted from a light emitting section 1 enters a signal light transmission fiber 3, is transmitted through the transmission optical fiber 3, enters a light receiving section 2, and then enters a signal processing section 6. A part of the leaked light that is emitted from the light emitting section 1 and does not enter the transmission optical fiber 3 enters the leaked light section 5, where it is processed and output according to the intensity of the light. This electrical signal is sent to the signal processing section 6, where it is compared with the initial setting value (the value when the physical quantity of light emitted from the light emitting section l is appropriate), and the light receiving section is processed by the difference. This is to correct the output of 2.
この場合、漏洩光モニタ部５でモニタされる漏洩光の物
理量も、信号光伝送用ファイバ３に入射する光の物理量
も発光部１から放射される光の物理量変化に比例して変
化するため、受光部２から信号処理部６へ送られる電気
信号を、比較した差分だけ補正すれば、発光部１から放
射される光の物理量変化分だけ補正され、物理量変化の
影響を受けることなく正確な測定ができる。In this case, the physical amount of leaked light monitored by the leaked light monitor section 5 and the physical amount of light incident on the signal light transmission fiber 3 change in proportion to the change in the physical amount of light emitted from the light emitting section 1. If the electric signal sent from the light receiving section 2 to the signal processing section 6 is corrected by the compared difference, the change in the physical quantity of the light emitted from the light emitting section 1 will be corrected, allowing accurate measurement without being affected by the change in the physical quantity. Can be done.
（実施例２）
第３図は本発明の光ファイバセンナの他の実施例である
。この光ファイバセンサは信号光伝送用ファイバ３の一
端３ａと、漏洩光を受光する漏洩光伝送用ファイバ４の
一端４ａとを発光部ｌに近接して配置し、漏洩光伝送用
ファイバ４の他端に漏洩光モニタ部５を配置してなるも
のである。しかも信号光伝送用ファイバ３の一端３ａは
発光部１から出射される光の出射光軸方向に配置され、
漏洩光伝送用ファイバ４の一端４ａは発光部１から出射
される光の出射光軸と垂直な方向に配置されている。(Embodiment 2) FIG. 3 shows another embodiment of the optical fiber sensor of the present invention. In this optical fiber sensor, one end 3a of a signal light transmission fiber 3 and one end 4a of a leakage light transmission fiber 4 that receives leaked light are arranged close to a light emitting part l, and the other end of the leakage light transmission fiber 4 is arranged close to a light emitting part l. A leakage light monitor section 5 is arranged at the end. Moreover, one end 3a of the signal light transmission fiber 3 is arranged in the direction of the optical axis of light emitted from the light emitting section 1,
One end 4a of the leakage light transmission fiber 4 is arranged in a direction perpendicular to the optical axis of light emitted from the light emitting section 1.
この光ファイバセンナではＬＥＤ等の発光部１から出射
される出射光がフェルール９を通して信号光伝送用ファ
イバ３へ入射され、発光部１から漏洩する散乱光がフェ
ルール１０を通して漏洩光伝送用ファイバ４に入射され
、夫々のファイ／＜により信号光、参照光として伝送さ
れる。なお第３図の８は発光部１の外周に被せた透明プ
ラスチック製のケースである。In this optical fiber sensor, light emitted from a light emitting unit 1 such as an LED enters the fiber 3 for transmitting signal light through the ferrule 9, and scattered light leaking from the light emitting unit 1 passes through the ferrule 10 and enters the fiber 4 for transmitting leaked light. The light is incident on the optical fiber and is transmitted as a signal light and a reference light through each fiber. Note that 8 in FIG. 3 is a case made of transparent plastic that covers the outer periphery of the light emitting section 1.
（発明の効果） 本発明の光ファイバセンサは次のような効果がある。(Effect of the invention) The optical fiber sensor of the present invention has the following effects.
（１）光源の出力変化を簡易な手段で容易に制御或は補
正することができるため高精度の測定が可能になる。(1) Since changes in the output of the light source can be easily controlled or corrected by simple means, highly accurate measurements are possible.
（２）構成が簡潔で、小型でき、製作が容易であるので
、実用化が容易である。(2) The structure is simple, compact, and easy to manufacture, so it is easy to put into practical use.
（３）従来のようにカブラを必要としないので低価格な
光ファイバセンサとなる。(3) The optical fiber sensor is inexpensive because it does not require a coupler as in the conventional case.
第１図〜第３図は本発明の光ファイバセンサの異なる実
施例の説明図、第４図は従来の光ファイバセンサの原理
説明図、第５図は従来の光ファイバセンサの説明図であ
る。
■は発光部
２は受光部
３は信号光伝送用ファイバ
４は参照光伝送用ファイバ
３ａは信号光伝送用ファイバの一端
４ａは漏洩光伝送用ファイバの一端
５は漏洩光モニタ部
６は信号処理部FIGS. 1 to 3 are explanatory diagrams of different embodiments of the optical fiber sensor of the present invention, FIG. 4 is an explanatory diagram of the principle of a conventional optical fiber sensor, and FIG. 5 is an explanatory diagram of a conventional optical fiber sensor. . 5 is a light emitting unit 2 is a light receiving unit 3 is a signal light transmission fiber 4 is a reference light transmission fiber 3a is one end of a signal light transmission fiber 4a is one end of a leakage light transmission fiber 5 is a leakage light monitor unit 6 is a signal processing Department
Claims (3)
より、ある物理量を検出する光ファイバセンサにおいて
、発光部１から放射される光を信号光伝送用ファイバ３
で受光し、同伝送用ファイバ３へ入射できずに漏洩する
漏洩光の光量をモニタし、モニタされた漏洩光により発
光部１から放射される光量が一定となるように発光部１
を制御するか、同伝送用ファイバ３からの出力を発光部
１から放射される光の光量変化に応じて補正するように
したことを特徴とする光ファイバ。(1) In an optical fiber sensor that detects a certain physical quantity by measuring the amount of attenuation of light passing through an optical fiber, the light emitted from the light emitting part 1 is transferred to the signal light transmission fiber 3.
monitors the amount of leaked light that is received by the transmission fiber 3 and leaks without being able to enter the transmission fiber 3.
An optical fiber characterized in that the output from the transmission fiber 3 is corrected according to changes in the amount of light emitted from the light emitting section 1.
受光する漏洩光伝送用ファイバ４の一端４ａとを発光部
１に近接して配置し、漏洩光伝送用ファイバ４の他端に
漏洩光モニタ部５を配置してなる特許請求の範囲第１項
記載の光ファイバセンサ。(2) One end 3a of the signal light transmission fiber 3 and one end 4a of the leaky light transmission fiber 4 that receives leaked light are arranged close to the light emitting section 1, and the other end of the leaky light transmission fiber 4 is arranged close to the light emitting part 1. The optical fiber sensor according to claim 1, further comprising a leakage light monitor section 5.
ら出射される光の出射光軸方向に配置し、漏洩光伝送用
ファイバ４の一端４ａを発光部１から出射される光の出
射光軸と垂直な方向に配置してなる特許請求の範囲第２
項記載の光ファイバセンサ。(3) One end 3a of the signal light transmission fiber 3 is arranged in the direction of the light output axis of the light emitted from the light emitting unit 1, and one end 4a of the leakage light transmission fiber 4 is arranged in the direction of the light output axis of the light emitted from the light emitting unit 1. Claim 2 arranged in a direction perpendicular to the emission axis
Optical fiber sensor described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62064840A JPS63231246A (en) | 1987-03-19 | 1987-03-19 | Optical fiber sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62064840A JPS63231246A (en) | 1987-03-19 | 1987-03-19 | Optical fiber sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63231246A true JPS63231246A (en) | 1988-09-27 |
Family
ID=13269828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62064840A Pending JPS63231246A (en) | 1987-03-19 | 1987-03-19 | Optical fiber sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63231246A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110116080A1 (en) * | 2009-11-18 | 2011-05-19 | Yokogawa Electric Corporation | Method of measuring optical loss and apparatus for measuring optical loss |
-
1987
- 1987-03-19 JP JP62064840A patent/JPS63231246A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110116080A1 (en) * | 2009-11-18 | 2011-05-19 | Yokogawa Electric Corporation | Method of measuring optical loss and apparatus for measuring optical loss |
| JP2011106992A (en) * | 2009-11-18 | 2011-06-02 | Yokogawa Electric Corp | Method of measuring light loss and light loss measuring instrument |
| US9255861B2 (en) * | 2009-11-18 | 2016-02-09 | Yokogawa Electric Corporation | Method of measuring optical loss and apparatus for measuring optical loss |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2116786C (en) | Dual-wavelength photometer and fiber-optic sensor probe | |
| US4653905A (en) | Fiber optic range finder systems | |
| JP2818300B2 (en) | Optical AC measurement method with temperature compensation and apparatus for implementing the method | |
| CN103278185A (en) | Cavity ring-down fiber grating sensing demodulating device based on calibrated fiber grating | |
| US20110128990A1 (en) | Optical fiber temperature sensor | |
| US4974961A (en) | Optical fibre measuring system | |
| JP2009063390A (en) | Optical fiber humidity sensor and humidity detection system using it | |
| CN1093640C (en) | Integral compensation fibre-optic current sensor | |
| JPS63231246A (en) | Optical fiber sensor | |
| JPS63184040A (en) | Apparatus for detecting pollution of liquid | |
| JPH068724B2 (en) | Optical detector | |
| JPH05272920A (en) | Optical-fiber displacement gage | |
| JPS63311307A (en) | Optical fiber type temperature sensor | |
| JPS6020024Y2 (en) | Optical pressure measuring device | |
| JPH0258575B2 (en) | ||
| JPS62217128A (en) | Calibration system for diffused light generating device and radiation thermometer | |
| JPS61162780A (en) | Measurement of exposure | |
| JPS6147514A (en) | Reflective type optical fiber sensor | |
| JP3110139B2 (en) | Optical fiber temperature sensor | |
| JPH0524031Y2 (en) | ||
| JPH0449905B2 (en) | ||
| JPH06137965A (en) | Optical fiber thermometer | |
| JPS63308531A (en) | Optical type gas pressure sensor | |
| JPS6348433A (en) | Measuring method for light transmission loss of optical fiber | |
| GB2206201A (en) | Method of refractometry and refractometer therefor |