JPS6256968B2 - - Google Patents
Info
- Publication number
- JPS6256968B2 JPS6256968B2 JP12013680A JP12013680A JPS6256968B2 JP S6256968 B2 JPS6256968 B2 JP S6256968B2 JP 12013680 A JP12013680 A JP 12013680A JP 12013680 A JP12013680 A JP 12013680A JP S6256968 B2 JPS6256968 B2 JP S6256968B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical crystal
- pressure
- optical
- components
- 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
- 230000003287 optical effect Effects 0.000 claims description 30
- 239000013078 crystal Substances 0.000 claims description 26
- 230000010287 polarization Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 3
- RLJMLMKIBZAXJO-UHFFFAOYSA-N lead nitrate Chemical compound [O-][N+](=O)O[Pb]O[N+]([O-])=O RLJMLMKIBZAXJO-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Description
【発明の詳細な説明】 この発明は偏波面型光圧力センサに関する。[Detailed description of the invention] The present invention relates to a polarization plane type optical pressure sensor.
従来の圧力センサではダイアフラムなどの可動
部分を含んでいて機械的振動の影響を受けやす
く、また、測定用信号に電気信号を用いており、
特に遠隔地測定においては電気ノイズの影響を受
けやすい欠点をもつていた。 Conventional pressure sensors include moving parts such as diaphragms and are susceptible to mechanical vibrations, and also use electrical signals for measurement signals.
In particular, remote location measurements have the disadvantage of being susceptible to electrical noise.
この発明は上記従来の欠点を解消して、振動及
び電気ノイズの影響を受けず、圧力変化を高精度
に検出することができる偏波面型光圧力センサを
提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks and provide a polarization plane type optical pressure sensor that is not affected by vibrations and electrical noise and can detect pressure changes with high precision.
この発明は上記目的を達成するために、入射光
の偏波面を一定にする偏光子と、光弾性効果を有
した光学結晶と、上記光学結晶を通過した光を垂
直な偏光二成分に分岐して射出する複合偏光プリ
ズムからなり、上記偏光二成分の大きさから上記
光学結晶に加わる圧力を検出することができるこ
とを特徴としている。 In order to achieve the above object, this invention includes a polarizer that makes the plane of polarization of incident light constant, an optical crystal that has a photoelastic effect, and splits the light that has passed through the optical crystal into two vertically polarized components. It is characterized in that the pressure applied to the optical crystal can be detected from the magnitude of the two polarized light components.
上記弾性効果とは物質に圧力が加わるとその物
質の屈折率が変化する効果である。 The above-mentioned elastic effect is an effect in which when pressure is applied to a substance, the refractive index of the substance changes.
以下、この発明の実施例について図面に基づき
説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図が上記実施例を示す構成図である。この
実施例は光源１より発せられた測定用信号光を光
フアイバー２を通じて集光するロツドレンズ３
と、その集光された光の偏波面を一定にする偏光
子４と、光弾性効果を有する物質からなる光学結
晶５と、光学結晶５を通過し楕円偏光された光を
互いに直角な偏光二成分に分岐させる複合偏光プ
リズム６と、分岐された光をそれぞれ集光するロ
ツドレンズ７と、各ロツドレンズ７からの光を光
フアイバー８を通じて導入され、電気信号に変換
する光検出器９と、その電気信号より圧力を表示
するための指示回路１０からなる
光源１は測定用信用信号光を発するレーザ・ダ
イオードなどである。 FIG. 1 is a configuration diagram showing the above embodiment. In this embodiment, a rod lens 3 condenses measurement signal light emitted from a light source 1 through an optical fiber 2.
, a polarizer 4 that makes the plane of polarization of the focused light constant, an optical crystal 5 made of a substance that has a photoelastic effect, and a polarizer 4 that converts the elliptically polarized light that has passed through the optical crystal 5 into two polarized lights perpendicular to each other. A compound polarizing prism 6 that splits the light into components, a rod lens 7 that focuses each of the split lights, a photodetector 9 that introduces the light from each rod lens 7 through an optical fiber 8 and converts it into an electrical signal, and a photodetector 9 that converts the light into an electrical signal. The light source 1 consists of an indicating circuit 10 for displaying pressure from a signal. The light source 1 is a laser diode or the like that emits a reliable signal light for measurement.
光学結晶５は複屈折性と光弾性効果を有する物
質、例えば硝酸バリウム、硝酸鉛などからなる。
この結晶５を通過した光は上記複屈折性と光弾性
効果により楕円偏光される。 The optical crystal 5 is made of a substance having birefringence and photoelasticity, such as barium nitrate and lead nitrate.
The light passing through this crystal 5 is elliptically polarized due to the above-mentioned birefringence and photoelastic effect.
光学結晶５は通過光の光軸とほぼ垂直に圧力Ｐ
を受ける面を有し、その面と反対側の面で固定さ
れている。 The optical crystal 5 is exposed to a pressure P almost perpendicular to the optical axis of the passing light.
It has a receiving surface and is fixed on the opposite surface.
ロツドレンズ７は複合偏光プリズム６により互
いに直角な偏光二成分に分岐され射出する光を受
光するようそれぞれ所定位置に配設されている。 The rod lenses 7 are respectively arranged at predetermined positions so as to receive the light which is split into two polarized components perpendicular to each other by the compound polarizing prism 6 and exits.
偏光子４と光学結晶５と複合偏光プリズム６の
位置関係及び光学結晶５の長さは光学結晶５に圧
力の加わつていない状態のときには複合偏光プリ
ズム６よりの偏光成分Ａが100％、一方の偏光成
分Ｂが０％となるように、また光学結晶５の最大
圧力負荷状態のときには偏光成分Ａが０％、偏光
成分Ｂが100％となるように設定されている。 The positional relationship between the polarizer 4, the optical crystal 5, and the composite polarizing prism 6 and the length of the optical crystal 5 are such that when no pressure is applied to the optical crystal 5, the polarized light component A from the composite polarizing prism 6 is 100%; The polarization component B is set to be 0%, and when the optical crystal 5 is in the maximum pressure load state, the polarization component A is set to be 0% and the polarization component B is set to be 100%.
このようにして、光学結晶５を通過したレーザ
光の偏波面は光学結晶５に加わる圧力によつて生
じる光弾性効果のみの影響を受けて変化し、各ロ
ツドレンズ７を通じて０％から100％までの光量
として検出され、さらに光検出器９において上記
圧力に対応した電気信号に変換されて指示回路１
０を通じて圧力が表示される。 In this way, the polarization plane of the laser beam that has passed through the optical crystal 5 changes under the influence of only the photoelastic effect caused by the pressure applied to the optical crystal 5, and changes from 0% to 100% through each rod lens 7. It is detected as the amount of light, and further converted into an electric signal corresponding to the pressure by the photodetector 9 and sent to the indicating circuit 1.
Pressure is displayed through 0.
次に、この考案の変形実施例について説明す
る。 Next, a modified example of this invention will be described.
第２図が上記変形実施例を示す構成図である。
上記実施例と同一部材については同一番号を付し
説明を省略する。この変形実施例は測定用信号光
を発する光源１と、入射光の偏波面を一定にする
偏光子４と、光弾性効果を有する物質からなる光
学結晶１１と、光学結晶１１を通過し楕円偏光さ
れた光を互いに直角な偏光二成分に分岐させる複
合偏光プリズム６と、分岐された光をそれぞれ集
光するロツドレンズ７と、各ロツドレンズ７から
の光を光フアイバー８を通じて導入され、電気信
号に変換する光検出器９と、その電気信号より圧
力を表示するための指示回路１０からなる。 FIG. 2 is a configuration diagram showing the modified embodiment.
Components that are the same as those in the above embodiment are given the same numbers and descriptions thereof will be omitted. This modified embodiment includes a light source 1 that emits a measurement signal light, a polarizer 4 that makes the plane of polarization of incident light constant, an optical crystal 11 made of a substance having a photoelastic effect, and an elliptically polarized light that passes through the optical crystal 11. A compound polarizing prism 6 splits the split light into two polarized components perpendicular to each other, a rod lens 7 focuses each of the split lights, and the light from each rod lens 7 is introduced through an optical fiber 8 and converted into an electrical signal. It consists of a photodetector 9 and an indicator circuit 10 for displaying the pressure from the electrical signal.
光学結晶１１は複屈折性と光弾性効果を有する
物質、例えば硝酸バリウム、硝酸鉛などからな
る。この結晶１１を通過した光は上記複屈折性と
光弾性効果により楕円偏光される。この光学結晶
１１は入射光と射出光の光軸が平行になるよう互
いに対向した屈折面と、通過光の光軸とほぼ垂直
に圧力Ｐを受ける面とをもち、その面と反対側の
面で固定されている。 The optical crystal 11 is made of a substance having birefringence and photoelasticity, such as barium nitrate and lead nitrate. The light passing through this crystal 11 is elliptically polarized due to the above-mentioned birefringence and photoelastic effect. This optical crystal 11 has refractive surfaces facing each other so that the optical axes of incident light and emitted light are parallel, and a surface that receives pressure P almost perpendicularly to the optical axis of passing light, and a surface opposite to that surface. is fixed.
このような光学結晶１１を用いれば、入射光と
射出光が平行になり、見通し位置に光学結晶１１
を配設でき、さらに光源１と光学結晶１１以外の
装置を近接して設けることができ構成が簡単にな
る。 If such an optical crystal 11 is used, the incident light and the emitted light will be parallel, and the optical crystal 11 will be placed at the line-of-sight position.
Furthermore, devices other than the light source 1 and the optical crystal 11 can be provided close to each other, which simplifies the configuration.
以上のようにこの発明によれば以下のような効
果をもつている。 As described above, the present invention has the following effects.
複合偏光プリズムによつて偏光二成分に分岐
し、それらを電気信号に変換して圧力検出を行
うので、指示回路の直流増幅器に発生するドリ
フトやその出力電圧の変動を相殺し、微小圧力
変化を高精度にとらえることができる。 The compound polarizing prism splits the polarized light into two components and converts them into electrical signals for pressure detection, which cancels out the drifts that occur in the direct current amplifier of the indicating circuit and fluctuations in its output voltage, thereby eliminating minute pressure changes. It can be captured with high precision.
センサ本体に機械的可動部分を含まないの
で、機械的振動ノイズを受けず、簡単な構成で
恒久的使用に耐える。 Since the sensor body does not include mechanically moving parts, it is not subject to mechanical vibration noise and has a simple structure that can withstand permanent use.
第１図はこの発明の実施例を示す構成図であ
る。第２図はこの発明の変形実施例を示す構成図
である。
１……光源、４……偏光子、５，１１……光学
結晶、６……複合偏光プリズム、９……光検出
器。
FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a block diagram showing a modified embodiment of the invention. 1...Light source, 4...Polarizer, 5, 11...Optical crystal, 6...Composite polarizing prism, 9...Photodetector.
Claims (1)
性効果を有した光学結晶と、上記光学結晶を通過
した光を垂直な偏光二成分に分岐して射出する複
合偏光プリズムからなり、上記偏光二成分の大き
さから上記光学結晶に加わる圧力を検出すること
ができる偏波面型光圧力センサ。1 Consists of a polarizer that makes the plane of polarization of incident light constant, an optical crystal that has a photoelastic effect, and a composite polarizing prism that splits the light that has passed through the optical crystal into two perpendicularly polarized components and outputs the two components. A polarization plane type optical pressure sensor that can detect the pressure applied to the optical crystal based on the magnitude of two polarized light components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12013680A JPS5744827A (en) | 1980-08-29 | 1980-08-29 | Polarization plane type light pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12013680A JPS5744827A (en) | 1980-08-29 | 1980-08-29 | Polarization plane type light pressure sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5744827A JPS5744827A (en) | 1982-03-13 |
| JPS6256968B2 true JPS6256968B2 (en) | 1987-11-28 |
Family
ID=14778851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12013680A Granted JPS5744827A (en) | 1980-08-29 | 1980-08-29 | Polarization plane type light pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5744827A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4368645A (en) * | 1980-09-26 | 1983-01-18 | United Technologies Corporation | Optical pressure sensor |
| JPS59635A (en) * | 1982-06-28 | 1984-01-05 | Hitachi Ltd | Power sensor |
| US4536651A (en) * | 1983-03-14 | 1985-08-20 | Pitney Bowes Inc. | Optical weighing scale utilizing a prism |
| JP2007139740A (en) * | 2005-10-20 | 2007-06-07 | Furukawa Electric Co Ltd:The | Detection device for polarization fluctuation in optical fiber |
-
1980
- 1980-08-29 JP JP12013680A patent/JPS5744827A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5744827A (en) | 1982-03-13 |
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