JPH04195104A - Optical fiber coil and production thereof - Google Patents
Optical fiber coil and production thereofInfo
- Publication number
- JPH04195104A JPH04195104A JP2332396A JP33239690A JPH04195104A JP H04195104 A JPH04195104 A JP H04195104A JP 2332396 A JP2332396 A JP 2332396A JP 33239690 A JP33239690 A JP 33239690A JP H04195104 A JPH04195104 A JP H04195104A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- coil
- fiber coil
- decreased
- wound
- 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 abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000011282 treatment Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 3
- 239000004020 conductor Substances 0.000 abstract 1
- 230000010287 polarization Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910000833 kovar Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Landscapes
- Gyroscopes (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、センシングループとして用いられる部分を
コイル状に巻回したセンサ用の光ファイバコイルとその
製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical fiber coil for a sensor, in which a portion used as a sensing loop is wound into a coil shape, and a method for manufacturing the same.
従来の技術
従来から、種々の用途に用いられるセンサとして高感度
、小型軽量、耐環境特性が良好であること、等の利点を
有している光ファイバを用いたセンサが使用されるよう
になりつつある。例えば、運動体の回転角速度を検出す
るための光ファイバ・ジャイロスコープにおいては、感
度を向上させるために、光ファイバをコイル状に巻回し
、光ファイバによって囲まれる面積を増大させている。Conventional technology Since the past, sensors using optical fibers have been used as sensors for various purposes, as they have advantages such as high sensitivity, small size, light weight, and good environmental resistance. It's coming. For example, in an optical fiber gyroscope for detecting the rotational angular velocity of a moving body, in order to improve sensitivity, the optical fiber is wound into a coil to increase the area surrounded by the optical fiber.
また、光フアイバ伝搬中の左右両回り光へ与える影響を
同一にするため、光ファイバコイルへは、光ファイバの
対称巻きと呼ばれる各種の複雑な巻き方が、提案されて
いる。第３図および第４図に対称巻きを実施した光ファ
イバコイルの従来例を示す。同図において、１は光ファ
イバ、２は光ファイバの中央部、３は光ファイバコイル
本体、４はコイルの中心軸方向である。第３図、第４図
に示すように、光ファイバ１の全長の中間部２からコイ
ル状に巻回し始め、１層あるいは２層毎に巻き始めを基
準として、両光ファイバを交互にコイル化している。Furthermore, in order to equalize the influence on the left and right light during propagation through the optical fiber, various complicated winding methods called symmetrical winding of the optical fiber have been proposed for the optical fiber coil. FIGS. 3 and 4 show conventional examples of optical fiber coils with symmetrical winding. In the figure, 1 is an optical fiber, 2 is a central portion of the optical fiber, 3 is an optical fiber coil body, and 4 is a central axis direction of the coil. As shown in Figs. 3 and 4, the optical fiber 1 is wound into a coil from the middle part 2 of its entire length, and both optical fibers are alternately coiled with the starting point of each layer or two layers as a reference. ing.
発明が解決しようとする課題
しかし、上記の多層に巻回された光ファイバコイルにお
いては、光ファイバが、１層または２層だけ飛び越えて
巻回される関係上、光ファイバにねじれ、歪みが発生し
光伝搬特性が、劣化してしまうとともに、光フアイバ自
体が破損しやすいという問題点を有していた。Problems to be Solved by the Invention However, in the above-mentioned optical fiber coil wound in multiple layers, since the optical fiber is wound over one or two layers, twisting and distortion occur in the optical fiber. However, there were problems in that the optical propagation characteristics deteriorated and the optical fiber itself was easily damaged.
本発明は、このような従来の課題を解決するものであり
、出力ドリフトの極めて小さく、シかも非常に安定した
温度特性、および、偏光特性を有スル光ファイバコイル
およびその製造方法を提供する。The present invention solves these conventional problems, and provides an optical fiber coil with extremely small output drift and very stable temperature and polarization characteristics, and a method for manufacturing the same.
課題を解決するための手段
本発明の光ファイバコイルは、光ファイバコイルの材質
として、熱伝導性に優れた物質を用いたものであり、し
かも、光ファイバがコイルに巻回された後、残留応力を
除去するために、作製した光ファイバコイル全体に加熱
、冷却処理を施すものである。Means for Solving the Problems The optical fiber coil of the present invention uses a material with excellent thermal conductivity as the material of the optical fiber coil, and furthermore, after the optical fiber is wound into the coil, no residual In order to remove stress, the entire fabricated optical fiber coil is subjected to heating and cooling treatments.
作 用
本発明による光ファイバコイルおよびその製造方法では
、上記のような構成および処理を実施することにより、
周囲の温度変化に対して、コイルの各層に巻回された光
フアイバ間の温度差および応力差を低減することが可能
であるとともに、光干渉出力信号における位相誤差を極
めて小さくすることが可能となる。従って、光伝搬特性
のバラツキを低減することが可能であり、光フアイバジ
ャイロの検出感度の向上をも同時に実現できる。Function: In the optical fiber coil and the manufacturing method thereof according to the present invention, by implementing the above-described configuration and processing,
In response to changes in ambient temperature, it is possible to reduce the temperature and stress differences between the optical fibers wound in each layer of the coil, and it is also possible to extremely minimize the phase error in the optical interference output signal. Become. Therefore, it is possible to reduce variations in light propagation characteristics, and it is also possible to simultaneously improve the detection sensitivity of the optical fiber gyro.
実施例
以下、本発明の一実施例について図面を参照しながら簡
単に説明する。第１図は今回作製した本発明の一実施例
における光ファイバコイルの断面図であり、第２図は光
ファイバコイルに実施した加熱・冷却処理方法（ヒート
サイクルパターン）である。まず、第１図より、光ファ
イバコイル用ボビン３に、この光ファイバの中央部２を
基準として、中央部２から互いに等距離にある部分が、
コイルの半径方向において、はぼ同じ位置にくるように
し、さらに中心軸に対しても対称となるように巻き付け
る。つまり、光ファイバコイル３を回転させながら、張
力を加えながら光ファイバ１を光ファイバコイル３に巻
き付けていく。光ファイバ１の一端を巻き終えた後、同
様な操作をコイルの中心軸に対して対称に実施し、光フ
ァイバコイル３を作製する。さらに作製した光ファイバ
コイル３に第２図に示すような加熱・冷却処理（ヒート
サイクル）を実施する。今回、実施したヒートサイクル
の詳細は、下記の如くである。下記の１から４までの１
サイクルの合計が４時間である。EXAMPLE Hereinafter, an example of the present invention will be briefly described with reference to the drawings. FIG. 1 is a cross-sectional view of an optical fiber coil according to an embodiment of the present invention that was produced this time, and FIG. 2 is a diagram showing a heating/cooling treatment method (heat cycle pattern) performed on the optical fiber coil. First, from FIG. 1, on the optical fiber coil bobbin 3, there are parts equidistant from the central part 2 of the optical fiber, with the central part 2 as a reference.
The coils should be wound at approximately the same position in the radial direction of the coil, and also symmetrically with respect to the central axis. That is, the optical fiber 1 is wound around the optical fiber coil 3 while rotating the optical fiber coil 3 and applying tension. After winding one end of the optical fiber 1, a similar operation is performed symmetrically with respect to the central axis of the coil to produce an optical fiber coil 3. Furthermore, the produced optical fiber coil 3 is subjected to heating/cooling treatment (heat cycle) as shown in FIG. The details of the heat cycle carried out this time are as follows. 1 from 1 to 4 below
The total cycle time is 4 hours.
１、−４０℃から、８０℃に上昇（１時間）２、 ８０
℃で保持 （１時間）３、 ８０℃から一４
０℃に下降（１時間）４、−４０℃で保持
（１時間）上述したヒートサイクルを１回実施したコイ
ルにおける偏光特性の変動量は、ヒートサイクル実施前
のコイルにおける偏光特性の変動量に比べて、約５ｄＢ
向上したという実験結果を得ている。また、フィルの作
製方法によっては、ヒートサイクルを繰り返す程、特性
の向上が認められるものもあった。なお、本実施例にお
いては、光ファイバコイル３の材質として、コバール材
、ステンレス材等を用いたが、熱伝導性の良好な材料で
あれば他のものでもかまわない。また、光ファイバ１と
しては、偏波面保存ファイバを用いているが、センシン
グ用ループとしてのコイルとしては、通常のシングルモ
ードファイバを用いた構成でもよいことは、言うまでも
ない。なお、本発明は上記実施例に限定されるものでは
なく、本発明の趣旨に基づいて種々の変形が可能であり
、これらを本発明の範囲から排除するものではない。1. Increase from -40℃ to 80℃ (1 hour) 2. 80
Hold at ℃ (1 hour) 3. From 80℃ to -4
Lower to 0℃ (1 hour) 4. Hold at -40℃
(1 hour) The amount of change in the polarization characteristics of the coil that has been subjected to the heat cycle described above is approximately 5 dB compared to the amount of change in the polarization characteristics of the coil before the heat cycle.
We have obtained experimental results that show improvement. Furthermore, depending on the method of producing the fill, there were some cases where the more the heat cycle was repeated, the more the properties were observed to improve. In this embodiment, Kovar material, stainless steel material, etc. were used as the material for the optical fiber coil 3, but other materials may be used as long as they have good thermal conductivity. Further, although a polarization maintaining fiber is used as the optical fiber 1, it goes without saying that a configuration using a normal single mode fiber may be used as the coil as the sensing loop. Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
発明の効果
以上のように、本発明によれば、光ファイバコイルの材
質を高熱伝導性物質で作製し、しかも、コイル作製後、
ファイバコイル全体に加熱、冷却処理を実施するだけで
、周囲の温度変化に対しても、安定な光伝搬特性が得ら
れるセンシング用光ファイバコイルを提供することが可
能であり、実用上極めて効果が大きい。Effects of the Invention As described above, according to the present invention, the material of the optical fiber coil is made of a highly thermally conductive substance, and furthermore, after the coil is made,
By simply heating and cooling the entire fiber coil, it is possible to provide an optical fiber coil for sensing that provides stable light propagation characteristics even with changes in ambient temperature, which is extremely effective in practice. big.
第１図は本発明の一実施例における光ファイバコイルへ
の光ファイバの巻き付は方法を示す断面図、第２図は同
光ファイバコイルに対して実施した加熱・冷却処理（ヒ
ートサイクル）のタイムチャート、第３図、第４図は従
来の光ファイバの対称巻きの断面図である。
１・・・光ファイバ、２・・・ファイバの中間部、３・
・・ファイバコイル、４・・・コイルの中心軸、１１．
１２・・・巻替用ボビン。
代理人の氏名 弁理士 小蝦治 明 ほか２名第１図
哩 鄭
国
へ
誠
第６図Fig. 1 is a cross-sectional view showing the method of winding an optical fiber around an optical fiber coil in an embodiment of the present invention, and Fig. 2 shows a heating/cooling treatment (heat cycle) performed on the optical fiber coil. The time charts, FIGS. 3 and 4, are cross-sectional views of symmetrical windings of conventional optical fibers. DESCRIPTION OF SYMBOLS 1... Optical fiber, 2... Middle part of fiber, 3...
... Fiber coil, 4... Central axis of the coil, 11.
12... Bobbin for rewinding. Name of agent: Patent attorney Akira Koeji and two others Figure 1: Zhengguo Makoto Figure 6
Claims (3)
１回以上実施する巻回してなる光ファイバコイルの製造
方法。(1) A method for manufacturing an optical fiber coil by winding the optical fiber coil by heating and cooling the optical fiber coil at least once.
、１３０℃、冷却処理温度の下限値として、−５０℃と
することを特徴とする請求項１記載の光ファイバコイル
の製造方法。(2) The method for manufacturing an optical fiber coil according to claim 1, wherein the upper limit of the heating treatment temperature of the optical fiber coil is 130°C, and the lower limit of the cooling treatment temperature is -50°C.
伝導度の高い物質を用いることを特徴とする光ファイバ
コイル。(3) An optical fiber coil characterized in that a substance with high thermal conductivity is used as the material of the coil around which the optical fiber is wound.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2332396A JPH04195104A (en) | 1990-11-28 | 1990-11-28 | Optical fiber coil and production thereof |
| EP91120327A EP0488255B1 (en) | 1990-11-28 | 1991-11-27 | Fiber-optic coil and method of manufacturing same |
| DE69117672T DE69117672D1 (en) | 1990-11-28 | 1991-11-27 | Fiber optic coil and manufacturing process |
| US07/800,041 US5168539A (en) | 1990-11-28 | 1991-11-29 | Fiber-optic coil and method of manufacturing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2332396A JPH04195104A (en) | 1990-11-28 | 1990-11-28 | Optical fiber coil and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04195104A true JPH04195104A (en) | 1992-07-15 |
Family
ID=18254507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2332396A Pending JPH04195104A (en) | 1990-11-28 | 1990-11-28 | Optical fiber coil and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04195104A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7043131B2 (en) | 1999-01-06 | 2006-05-09 | Sumitomo Electric Industries, Ltd. | Optical device and a making method thereof |
-
1990
- 1990-11-28 JP JP2332396A patent/JPH04195104A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7043131B2 (en) | 1999-01-06 | 2006-05-09 | Sumitomo Electric Industries, Ltd. | Optical device and a making method thereof |
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