JPS62272131A - Optical fiber temperature sensor - Google Patents
Optical fiber temperature sensorInfo
- Publication number
- JPS62272131A JPS62272131A JP61115841A JP11584186A JPS62272131A JP S62272131 A JPS62272131 A JP S62272131A JP 61115841 A JP61115841 A JP 61115841A JP 11584186 A JP11584186 A JP 11584186A JP S62272131 A JPS62272131 A JP S62272131A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- temperature
- tin
- temperature sensor
- sensor
- 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 44
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 abstract description 5
- 238000009529 body temperature measurement Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000000644 propagated effect Effects 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
産業上の利用分野
この発明は、温度センサに関し、特に光ファイバの損失
温度特性を利用した温度センサに関する。Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application This invention relates to a temperature sensor, and more particularly to a temperature sensor that utilizes the loss temperature characteristics of an optical fiber.
従来の技術
光ファイバを利用した温度センサは木質的に安全であり
、非″逝磁誘電性という特質を持ってｌ、Ｘる。そのた
め、近年、光ファイ／＜の反射率が温度変化することを
利用した反射型温度センサ、エタロン膜厚を利用した干
渉型温度センサ、後方散乱光を利用した温度分布センサ
等、種々の原理を応用した光フアイバ温度センナが研究
されている。Conventional technologyTemperature sensors using optical fibers are physically safe and have the property of non-magnetic dielectric properties.As a result, in recent years, it has been found that the reflectance of optical fibers changes with temperature. Optical fiber temperature sensors that apply various principles are being researched, such as reflective temperature sensors that utilize etalon film thickness, interferometric temperature sensors that utilize etalon film thickness, and temperature distribution sensors that utilize backscattered light.
これらの中で、光ファイバのコート材の熱膨張によるマ
イクロベンド損変化を利用した温度センサは、他の方式
の温度センサに比較して、センサ部に光フアイバ単体を
用いることができて簡単に構成できる点で優れている。Among these, temperature sensors that utilize microbend loss changes due to thermal expansion of the coating material of optical fibers are easier to use than other types of temperature sensors because they can use a single optical fiber in the sensor section. It is excellent in that it is configurable.
発明が解決しようとする問題点
しかしながら、このようなコート材の熱膨張を利用する
方式の光フアイバ温度センサでは、温度変化に対する損
失変化感度が高いことが要求されるが、ウレタン、アク
リル、エポキシアクリレート等の有機被覆にあっては感
度が低く、またアルミニウム、鉄、銅等の金属材料では
塑性変形のためヒステリシスを持つので精度が悪いとい
う問題がある。Problems to be Solved by the Invention However, optical fiber temperature sensors that utilize the thermal expansion of coating materials are required to have high loss change sensitivity to temperature changes. There is a problem in that sensitivity is low for organic coatings such as aluminum, iron, copper, etc., and that accuracy is poor because metal materials such as aluminum, iron, copper, etc. have hysteresis due to plastic deformation.
たとえば、アルミニウムを直径１７５．ｗｍにコーティ
ングしたシングルモード光ファイバ（コア径９ルｍ、フ
ァイバ径１２５ルｍ）の温度に対する損失変化は第４図
のように実測される。この第４図から分るようにヒステ
リシスが大きく、温度精度が悪い。For example, aluminum has a diameter of 175mm. The change in loss with respect to temperature of a single mode optical fiber (core diameter 9 m, fiber diameter 125 m) coated with wm is actually measured as shown in FIG. As can be seen from FIG. 4, the hysteresis is large and the temperature accuracy is poor.
また、コア径５０ｇｍ、ファイバ径１２５４ｍのシング
ルモード光ファイバにアルミニウムを直径１５０ 鉢ｍ
にコーティングした後その上にニッケルを直径１７０ｇ
ｍにコーティングしたものでは、損失温度変化は第５図
のようになった。この場合はヒステリシスは少ないが損
失変化が少なく感度が悪い。In addition, a single mode optical fiber with a core diameter of 50 gm and a fiber diameter of 1254 m is coated with aluminum in a diameter of 150 m.
After coating, 170g of nickel in diameter
For the one coated with M, the loss temperature change was as shown in Figure 5. In this case, the hysteresis is small, but the loss change is small and the sensitivity is poor.
この発明は、ヒステリシスが少なく温度精度の高い、光
ファイバのコート材の熱膨張によるマイクロへンド損変
化を利用するタイプの、温度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 provide a temperature sensor of a type that uses micro bend loss changes due to thermal expansion of an optical fiber coating material, which has little hysteresis and high temperature accuracy.
問題点を解決するための手段
この発明による光フアイバ温度センサは、錫をコーティ
ングした光ファイバを用いることを特徴とする。Means for Solving the Problems The optical fiber temperature sensor according to the present invention is characterized in that it uses a tin-coated optical fiber.
作 用
光ファイバのコート材として錫を用いることにより、ヒ
ステリシスが少なく温度測定精度が高い光フアイバ温度
センサを実現できる。By using tin as a coating material for the working optical fiber, it is possible to realize an optical fiber temperature sensor with little hysteresis and high temperature measurement accuracy.
実施例
第１図はこの発明の一実施例にかかる光フアイバ温度セ
ンサの概略を示すブロック図で、光源１からの光をセン
サ用の錫コート光ファイバ２中に入射し、この光ファイ
バ２の他端に光検出器３を配して光ファイバ２を伝搬す
る光の損失を測定するという構成をとる。Embodiment FIG. 1 is a block diagram schematically showing an optical fiber temperature sensor according to an embodiment of the present invention. Light from a light source 1 is input into a tin-coated optical fiber 2 for the sensor, and the optical fiber 2 is A configuration is adopted in which a photodetector 3 is disposed at the other end to measure the loss of light propagating through the optical fiber 2.
この錫コート光ファイバ２は測定対象４中を通るように
配置される。この光ファイバ２は、第２図に断面を示す
ように、光ファイバ２１の外周に錫コート２２を設けた
ものである。This tin-coated optical fiber 2 is arranged so as to pass through the measurement object 4. This optical fiber 2 has a tin coat 22 provided on the outer periphery of an optical fiber 21, as shown in a cross section in FIG.
つぎに、コア径５０ｇｍ、 ファイｚ＜径１２５Ｊｉｍ
のグレイデッドインデックス型シングルモード光ファイ
バに錫を直径１７（）ｇｍにコーティングしてセンサ用
鍋コート光ファイバを作成して、その温度−損失変化特
性を波長１ 、３１Ｌｍの光で測定してみた。測定結果
は第３図のようになり。Next, the core diameter is 50gm, and the diameter is 125Jim.
A graded-index single mode optical fiber was coated with tin to a diameter of 17 gm to create a pan-coated optical fiber for sensors, and its temperature-loss change characteristics were measured using light with a wavelength of 1 and 31 Lm. . The measurement results are shown in Figure 3.
−１０℃〜１０℃の範囲でヒステリシスが少なく、可逆
的であることが分る。It can be seen that there is little hysteresis in the range of -10°C to 10°C and that it is reversible.
なお、他の実験によれば、錫コート２２の厚さが１００
４ｍオーダ以下の場合、温度−損失変化特性には大きな
差異が見られなかった。According to other experiments, the thickness of the tin coat 22 is 100 mm.
In the case of 4 m order or less, no significant difference was observed in the temperature-loss change characteristics.
発明の効果
この発明によれば、錫をコーティングした光ファイバを
センサ用光ファイバとして用いることによりヒステリシ
スが少なく温度測定精度の高い光フアイバ温度センサを
実現できる。また、このセンサ用光ファイバを用いてパ
ルス反射法による測定を行なえば、温度分布を測定する
ことが可能である。Effects of the Invention According to the present invention, by using a tin-coated optical fiber as an optical fiber for a sensor, an optical fiber temperature sensor with less hysteresis and high temperature measurement accuracy can be realized. Furthermore, temperature distribution can be measured by performing measurement using the pulse reflection method using this sensor optical fiber.
第１図はこの発明の一実施例のブロック図、第２図は第
１図のセンサ用光ファイバの断面図、第３図は錫コート
光ファイバの損失温度特性を表わすグラフ、第４図およ
び第５図は従来例の損失温度特性をそれぞれ表わすグラ
フである。FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the sensor optical fiber shown in FIG. 1, FIG. 3 is a graph showing the loss temperature characteristics of the tin-coated optical fiber, and FIGS. FIG. 5 is a graph showing the loss temperature characteristics of the conventional example.
Claims (1)
光ファイバとして用いた光ファイバ温度センサ。(1) An optical fiber temperature sensor using a tin-coated optical fiber as a sensor optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61115841A JPS62272131A (en) | 1986-05-20 | 1986-05-20 | Optical fiber temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61115841A JPS62272131A (en) | 1986-05-20 | 1986-05-20 | Optical fiber temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62272131A true JPS62272131A (en) | 1987-11-26 |
Family
ID=14672446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61115841A Pending JPS62272131A (en) | 1986-05-20 | 1986-05-20 | Optical fiber temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62272131A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02278214A (en) * | 1989-04-20 | 1990-11-14 | Furukawa Electric Co Ltd:The | Hermetically coated optical fiber and production thereof |
-
1986
- 1986-05-20 JP JP61115841A patent/JPS62272131A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02278214A (en) * | 1989-04-20 | 1990-11-14 | Furukawa Electric Co Ltd:The | Hermetically coated optical fiber and production thereof |
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