JPH035847Y2 - - Google Patents
Info
- Publication number
- JPH035847Y2 JPH035847Y2 JP10564584U JP10564584U JPH035847Y2 JP H035847 Y2 JPH035847 Y2 JP H035847Y2 JP 10564584 U JP10564584 U JP 10564584U JP 10564584 U JP10564584 U JP 10564584U JP H035847 Y2 JPH035847 Y2 JP H035847Y2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- polarization
- coiled
- directional coupler
- terminals
- 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
- 239000013307 optical fiber Substances 0.000 claims description 65
- 230000010287 polarization Effects 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000005253 cladding Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007526 fusion splicing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 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
- Gyroscopes (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
【考案の詳細な説明】
〔考案の背景と目的〕
本考案は光フアイバセンサに関するものであ
る。[Detailed Description of the Invention] [Background and Purpose of the Invention] The present invention relates to an optical fiber sensor.
サグナツク効果や光弾性効果を利用した光フア
イバ式回転角速度センサや音響センサが広く検討
されている。 Fiber optic rotational angular velocity sensors and acoustic sensors that utilize the Sagnatsk effect and photoelastic effect have been widely studied.
従来の方式は光フアイバセンサ部と送受光素子
との結合部のレンズ系などが複雑で、量産向きで
はなかつた。また光フアイバの実装にボビンに巻
いたものが多く見られ、光フアイバの軽量性やコ
ンパクト性等が十分ではなかつた。そしてまた光
フアイバ、補強層、ボビン等の線膨張係数の差か
ら光フアイバに不必要な側圧や歪が加えられ、受
光系におけるノイズ源となつていた。 The conventional method was not suitable for mass production because the lens system at the joint between the optical fiber sensor and the light transmitting/receiving element was complicated. In addition, optical fibers are often mounted by winding them around bobbins, and the optical fibers are not sufficiently lightweight or compact. Furthermore, unnecessary lateral pressure and strain are applied to the optical fiber due to differences in linear expansion coefficients of the optical fiber, the reinforcing layer, the bobbin, etc., and this becomes a noise source in the light receiving system.
本考案は以上の点に鑑みなされたものであり、
実装性、量産性および温度特性の向上を可能とし
た光フアイバセンサを提供することを目的とする
ものである。 This invention was created in view of the above points,
The object of the present invention is to provide an optical fiber sensor that allows for improved mounting performance, mass productivity, and temperature characteristics.
すなわち本考案は光フアイバセンサを補強層を
施した偏波面保存光フアイバを円筒状に整列巻
し、かつ前記補強層のそれとほぼ同じ線膨張係数
のプラスチツクで固定したコイル状光フアイバ
と、前記偏波面保存光フアイバで形成し、かつ両
側に夫々２個の端子を有する光フアイバ形方向性
結合器と、この方向性結合器の一方側の前記両端
子と前記コイル状光フアイバの両端子とを、これ
ら両者の固有偏光軸を整合させて融着接続した接
続部とで構成したことを特徴とするものであり、
これによつて光フアイバセンサは偏波面保存光フ
アイバをコイル状に巻回したコイル状光フアイバ
と、偏波面保存光フアイバで両側に夫々２個の端
子を有するように形成した光フアイバ形方向性結
合器と、これらコイル状光フアイバと光フアイバ
形方向性結合器との端子間を融着接続した接続部
とで構成されるようになる。
That is, the present invention uses a coiled optical fiber in which a polarization-maintaining optical fiber provided with a reinforcing layer is wound in a cylindrical shape and fixed with plastic having a coefficient of linear expansion that is approximately the same as that of the reinforcing layer, and the polarization An optical fiber type directional coupler formed of a wavefront preserving optical fiber and having two terminals on each side, and both terminals on one side of the directional coupler and both terminals of the coiled optical fiber. , and a connecting part which is fused and spliced by aligning the intrinsic polarization axes of the two,
As a result, the optical fiber sensor consists of a coiled optical fiber in which a polarization-maintaining optical fiber is wound into a coil, and an optical fiber having two terminals on each side of the polarization-maintaining optical fiber. It is composed of a coupler and a connecting portion in which the terminals of these coiled optical fibers and the optical fiber type directional coupler are fused and spliced.
以下、図示した実施例に基づいて本考案を説明す
る。第１図には本考案の一実施例が示されてい
る。本実施例では光フアイバセンサを補強層を施
した偏波面保存光フアイバを円筒状に整列巻し、
かつ補強層のそれとほぼ同じ線膨張係数のプラス
チツクで固定したコイル状光フアイバ１と、偏波
面保存光フアイバで形成し、かつ両側に夫々２個
の端子を有する光フアイバ形方向性結合器２と、
この方向性結合器２の一方側の両端子とコイル状
光フアイバ１の両端子とを、これら両者の固有偏
光軸を整合させて融着接続した接続部３とで構成
した。このようにすることにより光フアイバセン
サは偏波面保存光フアイバをコイル状に巻回した
コイル状光フアイバ１と、偏波面保存光フアイバ
で両側に夫々２個の端子を有するように形成した
光フアイバ形方向性結合器２と、これらコイル状
光フアイバ１と光フアイバ形方向性結合器２との
端子間を融着接続した接続部３とで構成されるよ
うになつて、実装性、量産性および温度特性の向
上を可能とした光フアイバセンサを得ることがで
きる。
Hereinafter, the present invention will be explained based on the illustrated embodiments. FIG. 1 shows an embodiment of the present invention. In this example, the optical fiber sensor is made by winding polarization-maintaining optical fibers with a reinforcing layer in a cylindrical shape.
and a coiled optical fiber 1 fixed with plastic having a linear expansion coefficient substantially the same as that of the reinforcing layer, and an optical fiber type directional coupler 2 formed of a polarization maintaining optical fiber and having two terminals on each side. ,
Both terminals on one side of the directional coupler 2 and both terminals of the coiled optical fiber 1 were constructed with a connecting portion 3 which was fusion-connected with their respective polarization axes aligned. By doing so, the optical fiber sensor includes a coiled optical fiber 1 which is a polarization-maintaining optical fiber wound into a coil, and an optical fiber formed with two terminals on each side of the polarization-maintaining optical fiber. The structure is composed of a shaped directional coupler 2 and a connecting part 3 in which the terminals of the coiled optical fiber 1 and the optical fiber shaped directional coupler 2 are fused and spliced. Furthermore, an optical fiber sensor with improved temperature characteristics can be obtained.
すなわち使用した偏波面保存光フアイバは第２
図にも示されているように、コア４と、このコア
４の外周に設けられたクラツド５と、このクラツ
ド５の外周に設けられた異方性歪印加部６と、こ
の異方性歪印加物６の外周に設けられたサポ−ト
７とで構成されている。このように構成された偏
波面保存光フアイバ８でコイル状光フアイバ１を
つくつたが、コ−テイングは紫外線硬化すなわち
UVキユアを用いた
すなわち125μmの外径を有する偏波面保存光フア
イバ８上に厚さ50Mm程度のコ−テイングを施し
外径を225μmとしたものを、ビニ−ル性のボビン
（図示せず）上に一層約200m整列巻し、表面をエ
ポキシレジンで塗布固定した。次いでビニ−ル性
のボビンを縮少させ、コイル状光フアイバ１とボ
ビンとを分離させた。このようにして構成したコ
イル状光フアイバ１の両端を偏波面保存光フアイ
バ８で形成した光フアイバ形方向性結合器２（２
×２、エバネセント波結合を原理とするもの）の
片端に夫々融着接続した。この融着接続は回転機
能付の接続器を用いて行なつたが、接続部３はモ
−ルド補強される。 In other words, the polarization maintaining optical fiber used is
As shown in the figure, there is a core 4, a cladding 5 provided on the outer periphery of the core 4, an anisotropic strain applying section 6 provided on the outer periphery of the cladding 5, and an anisotropic strain applying section 6 provided on the outer periphery of the cladding 5. It is composed of a support 7 provided on the outer periphery of the application object 6. A coiled optical fiber 1 was made from the polarization-maintaining optical fiber 8 constructed in this way, but the coating was cured by ultraviolet light, i.e.
A vinyl bobbin (not shown) is made by applying a coating to a thickness of about 50 mm on a polarization-maintaining optical fiber 8 that uses UV cure, that is, has an outer diameter of 125 μm, and has an outer diameter of 225 μm. A layer of approximately 200 m was wound in an aligned manner on top, and the surface was fixed with epoxy resin. Next, the vinyl bobbin was shrunk, and the coiled optical fiber 1 and the bobbin were separated. An optical fiber type directional coupler 2 (2
×2, based on the principle of evanescent wave coupling) were fusion-spliced at one end of each. This fusion splicing was performed using a connector with a rotating function, and the connecting portion 3 was reinforced by molding.
このようにして構成した光フアイバセンサで光
フアイバ形方向性結合器２の他方側の端子である
Ａ端子を光源と、Ｂ端子を受光部と結合させる
と、受光部では偏波面保存光フアイバ８でつくつ
たコイル状光フアイバ１、光フアイバ形方向性結
合器２に印加された温度、圧力、音響、回転角速
度等の物理量に対し非常に高感度で、安定な位相
変化量が出力できる。そしてレンズ系を用いない
ので小形化、軽量化ができると共に、振動特性等
の信頼性が向上できる。また光フアイバ部（コイ
ル状光フアイバ１）、光フアイバ形方向性結合器
２が個別生産できるので、量産向きである。そし
てまたコイル状光フアイバ１に心のボビンがな
く、かつ全体が同程度の線膨張係数の材質ででき
ているので、実装性が向上し、温度特性が安定で
ある。 In the optical fiber sensor configured in this manner, when the A terminal, which is the other terminal of the optical fiber type directional coupler 2, is coupled to the light source and the B terminal is coupled to the light receiving section, the polarization preserving optical fiber 8 is connected to the light receiving section. It is extremely sensitive to physical quantities such as temperature, pressure, sound, and rotational angular velocity applied to the coiled optical fiber 1 and the optical fiber type directional coupler 2, and can output a stable amount of phase change. Since no lens system is used, the device can be made smaller and lighter, and reliability such as vibration characteristics can be improved. Furthermore, since the optical fiber portion (coiled optical fiber 1) and the optical fiber type directional coupler 2 can be individually produced, it is suitable for mass production. Furthermore, since the coiled optical fiber 1 does not have a core bobbin and is made entirely of a material with a similar coefficient of linear expansion, mounting performance is improved and temperature characteristics are stable.
なお本実施例ではコイル状光フアイバ１をエポ
キシレジンで固めたが、これのみに限るものでは
なくウレタン、エナメル等が使用でき、かつエポ
キシレジンに石英紛を混ぜて使用するようにして
もよい。 Although the coiled optical fiber 1 is hardened with epoxy resin in this embodiment, it is not limited to this, and urethane, enamel, etc. may be used, and quartz powder may be mixed with the epoxy resin.
上述のように本考案は光フアイバセンサの実装
性、量産性および温度特性が向上するようになつ
て、実装性、量産性および温度特性の向上を可能
とした光フアイバセンサを得ることができる。
As described above, the present invention improves the mountability, mass-productivity, and temperature characteristics of the optical fiber sensor, making it possible to obtain an optical fiber sensor with improved mountability, mass-productivity, and temperature characteristics.
第１図は本考案の光フアイバセンサの一実施例
の構成図、第２図は同じく一実施例の偏波面保存
光フアイバの断面図である。
１；コイル状光フアイバ、２；光フアイバ形方
向性結合器、３；接続部、４；コア、５；クラツ
ド、６；異方性歪印加物、７；サポ−ト、８；偏
波面保存光フアイバ。
FIG. 1 is a block diagram of an embodiment of the optical fiber sensor of the present invention, and FIG. 2 is a sectional view of a polarization-maintaining optical fiber of the same embodiment. 1; Coiled optical fiber; 2; Optical fiber directional coupler; 3; Connection portion; 4; Core; 5; Clad; 6; Anisotropic strain applying object; 7; Support; optical fiber.
Claims (1)
状に整列巻し、かつ前記補強層のそれとほぼ同
じ線膨張係数のプラスチツクで固定したコイル
状光フアイバと、前記偏波面保存光フアイバで
形成し、かつ両側に夫々２個の端子を有する光
フアイバ形方向性結合器と、この方向性結合器
の一方側の前記両端子と前記コイル状光フアイ
バの両端子とを、これら両者の固有偏光軸を整
合させて融着接続した接続部とで構成したこと
を特徴とする光フアイバセンサ。 (2) 前記偏波面保存光フアイバが、コアと、この
コアの外周に設けられたクラツドと、このクラ
ツドの外周に設けられた異方性歪印加部と、こ
の異方性歪印加部の外周に設けられたサポ−ト
とで構成されたものである実用新案登録請求の
範囲第１項記載の光フアイバセンサ。[Claims for Utility Model Registration] (1) A coiled optical fiber in which a polarization-maintaining optical fiber provided with a reinforcing layer is wound in a cylindrical shape and fixed with plastic having a coefficient of linear expansion approximately the same as that of the reinforcing layer. , an optical fiber type directional coupler formed of the polarization-maintaining optical fiber and having two terminals on each side, both terminals on one side of the directional coupler and both ends of the coiled optical fiber. 1. An optical fiber sensor comprising: an optical fiber sensor, and a connecting portion that is fusion-spliced with the inherent polarization axes of the two aligned. (2) The polarization-maintaining optical fiber includes a core, a cladding provided on the outer periphery of the core, an anisotropic strain applying section provided on the outer periphery of the cladding, and an outer periphery of the anisotropic strain applying section. The optical fiber sensor according to claim 1, which comprises a support provided in the utility model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10564584U JPS6122002U (en) | 1984-07-12 | 1984-07-12 | fiber optic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10564584U JPS6122002U (en) | 1984-07-12 | 1984-07-12 | fiber optic sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6122002U JPS6122002U (en) | 1986-02-08 |
| JPH035847Y2 true JPH035847Y2 (en) | 1991-02-14 |
Family
ID=30664954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10564584U Granted JPS6122002U (en) | 1984-07-12 | 1984-07-12 | fiber optic sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6122002U (en) |
-
1984
- 1984-07-12 JP JP10564584U patent/JPS6122002U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6122002U (en) | 1986-02-08 |
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