JPH02183130A - Optical fiber temperature sensor - Google Patents
Optical fiber temperature sensorInfo
- Publication number
- JPH02183130A JPH02183130A JP1001187A JP118789A JPH02183130A JP H02183130 A JPH02183130 A JP H02183130A JP 1001187 A JP1001187 A JP 1001187A JP 118789 A JP118789 A JP 118789A JP H02183130 A JPH02183130 A JP H02183130A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- temperature
- rare earth
- length
- loss
- 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 41
- 150000002910 rare earth metals Chemical group 0.000 claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims abstract description 10
- 229910052693 Europium Inorganic materials 0.000 claims description 3
- 229910052779 Neodymium Inorganic materials 0.000 claims description 3
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 2
- 229910052772 Samarium Inorganic materials 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 18
- 239000004020 conductor Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 6
- 238000003860 storage Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 239000010949 copper Substances 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000000644 propagated effect Effects 0.000 abstract 2
- 239000000835 fiber Substances 0.000 description 18
- 238000005253 cladding Methods 0.000 description 5
- 239000002019 doping agent Substances 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用公費〉
本発明は、ビルの火災検知器、又はガスタンク等の強撚
性物質貯蔵容器や電カケープルの導体表面の温度をリア
ルタイムで測定できる温度センサとして用いることがで
きる光ファイバ温度センサに関する。[Detailed description of the invention] <Industrial use public funds> The present invention can be used as a fire detector in a building, or as a temperature sensor that can measure the temperature of the conductor surface of a highly twisted material storage container such as a gas tank or a power cable in real time. The present invention relates to an optical fiber temperature sensor that can be used.
〈従来の技術〉
建築物等の火災検知器として従来より用いられているも
のとしては、例えば「機械の研究第３８巻第１号（１９
８６）Ｐ２３４Ｊに示されている定温式スポット型熱セ
ンサがある。この定温式スポット型熱センサの原理を第
１０図に示す。同図に示すようにこの熱センサば例えば
黄銅とインパールとのように膨張率の異なる２種の金属
板をはり合せたバイメタル１を利用したものである。す
なわち、センサ本体２内にはバイメタル１の一端の接点
ａとともに、通常状態では接点ａと離れている接点すが
設けられており、炎３などによリセンサ本体２が熱せら
れである温度に達すると湾曲したバイメタル１の接点ａ
と接点すとが接触し、火災ランプ４が点燈するとともに
警報ベル５が鳴るようになっている。なお、図中、６は
電池を示す。<Prior art> Examples of fire detectors conventionally used in buildings, etc.
86) There is a constant temperature spot type thermal sensor shown in P234J. The principle of this constant temperature spot type thermal sensor is shown in FIG. As shown in the figure, this thermal sensor utilizes a bimetal 1 made by laminating two metal plates having different coefficients of expansion, such as brass and Imphal. That is, the sensor body 2 is provided with a contact point a at one end of the bimetal 1, as well as a contact point that is separated from the contact point a in the normal state, and when the sensor body 2 is heated by the flame 3 or the like, it reaches a certain temperature. Then, the contact point a of the curved bimetal 1
When the contact point and the contact point come into contact, the fire lamp 4 lights up and the alarm bell 5 sounds. In addition, in the figure, 6 indicates a battery.
〈発明が解決しようとする課題〉
しかし、〜上述したように、定温式スポット型熱センサ
においては、例えば火災等により高温状態になったとき
に接点ａと接点すとが接触することで火災ランプ４及び
警報ペル５に通電されるようになっているので、接点ａ
。<Problems to be Solved by the Invention> However, as described above, in fixed temperature spot type thermal sensors, when the temperature reaches a high temperature due to a fire, for example, contact a and contact 4 and alarm pel 5 are energized, so contact a
.
ｂ同士が接触する瞬間には必ずスパークが生じるという
問題がある。このため、この種の熱センサの用途は民家
やオフィスなどの火災報知晋に限られ、例えばガスタン
ク等の強撚性物質貯蔵容器の温度センサには使用するこ
とができなかった。There is a problem in that sparks are always generated the moment b come into contact with each other. For this reason, the use of this type of thermal sensor is limited to fire alarms in private houses and offices, and cannot be used as a temperature sensor for highly twisted material storage containers such as gas tanks.
また、この種の熱センサは電流のオン、オフによって情
報伝達を行うため、例えば火災場所を同定するシステム
とする場合には、一つのセンサに対して一本の銅ケーブ
ルなどの配線が必要となるという問題もある。例えば、
数百もの熱センサを必要とするような超高層ビルに火災
場所を同定する火災検知システムを導入する場合には、
数百本もの鋼ケーブル等の配線が必要となり、全ての配
線が監視室に集中して大きな空間を占有すると共に、経
済的負担が非常に大きい。In addition, this type of thermal sensor transmits information by turning on and off the current, so when using a system to identify the location of a fire, for example, a single copper cable or other wiring is required for each sensor. There is also the issue of becoming. for example,
When implementing a fire detection system to identify the location of a fire in a skyscraper that requires hundreds of thermal sensors,
Hundreds of wires such as steel cables are required, and all the wires are concentrated in the monitoring room, occupying a large space and placing an extremely large economic burden.
なお、ガスタンク等の強撚性物質貯蔵タンク表面の温度
分布を、熱電対を用いて測定することも考えられるが、
この場合も同様に測定点の数に対応する本数の熱電対が
必要となり、経済的負担が大きい。It is also possible to measure the temperature distribution on the surface of a highly twisted material storage tank such as a gas tank using a thermocouple.
In this case as well, the number of thermocouples corresponding to the number of measurement points is required, which imposes a large economic burden.
一方、電カケープルの導体表面の長さ方向の温度分布が
測定できれば、導電部での発熱量がわかり、この発熱量
から電カケープルのどの部分が劣化しているかを知るこ
とができるが、電カケープルのように大電流が流れ、強
磁場が発生する導体表面の温度を測定できろセンサは従
来には存在せず、かかるセンサの出現が待望されている
。On the other hand, if the temperature distribution in the length direction of the conductor surface of a power cable can be measured, the amount of heat generated in the conductive part can be determined, and from this amount of heat generation, it is possible to know which part of the power cable is deteriorating. There is no conventional sensor that can measure the temperature on the surface of a conductor through which a large current flows and a strong magnetic field is generated, and the emergence of such a sensor is eagerly awaited.
本発明はこのような事情に鑑み、ガスタンク等の強撚性
物質貯蔵容器や電カケープルの導体表面の温度分布を単
純な配線によリリアルタイムで測定できる光ファイバ温
度センサを提供することを目的とする。In view of these circumstances, it is an object of the present invention to provide an optical fiber temperature sensor that can measure the temperature distribution on the conductor surface of a highly twisted material storage container such as a gas tank or a power cable in real time using simple wiring. do.
く課題を解決するための手段〉
前記目的を達成する本発明にかかる光フアイバ温度セン
サは、少なくとも光が伝搬する部分の一部に希土類原子
が含有されている光ファイバの吸収損失の温度依存性を
利用したことを特徴とする。Means for Solving the Problems> An optical fiber temperature sensor according to the present invention that achieves the above object is characterized by the temperature dependence of absorption loss of an optical fiber containing rare earth atoms at least in a part of the portion through which light propagates. It is characterized by the use of
く作 用〉
光が伝搬する部分に希土類原子が含有されている光ファ
イバの吸収損失は温度依存性を示す。したがって、この
光ファイバの長手方向の損失分布を測定することにより
、光ファイバの長手方向の温度分布を測定することがで
きる。Effect> The absorption loss of an optical fiber containing rare earth atoms in the portion through which light propagates is temperature dependent. Therefore, by measuring the loss distribution in the longitudinal direction of this optical fiber, it is possible to measure the temperature distribution in the longitudinal direction of the optical fiber.
く実 施 例〉
実施例１
第１図に示すように、ＳｉＯからなるコア１１、Ｆ添加
Ｓｉｎ、からなるクラッド１２及びシリコーン樹脂から
なる被覆１３で構成されるファイバＡ〜Ｃを以下のよう
にして製造した。各ファイバＡ〜Ｃは、コア径が８−。Examples Example 1 As shown in FIG. 1, fibers A to C, which are composed of a core 11 made of SiO, a cladding 12 made of F-added Sin, and a coating 13 made of silicone resin, were prepared as follows. Manufactured by Each fiber A to C has a core diameter of 8-.
クラツド径が１２５４．被覆の外径が４００゜であり、
各ファイバＡ−Ｃのコア１１及びクラッド１２の内側の
一部には、それぞれ下表に示すように添加した希土類元
素が均一に含有されている。なお、各ファイバＡ〜Ｃの
比屈折率差は０．３％であった。Cladding diameter is 1254. The outer diameter of the coating is 400°,
A portion of the inner side of the core 11 and cladding 12 of each fiber A to C uniformly contains rare earth elements added as shown in the table below. Note that the relative refractive index difference between each of the fibers A to C was 0.3%.
これらファイバの元となるプリフォームは、ＭＣＶＤ法
を応用して製造する。具体的には、例えば第２図に示す
ようにプリフォームのクラッド部となるパイプ１４内に
コアガラスを堆積させろ際に、パイプ１４に隣接してド
ーパント室１５を設け、このドーパント室１５内に希土
類原料１６（ＮｄＣｊ等の塩化物）を入れて該ドーパン
ト室１５を約１０００℃に加熱することにより希土類原
料１６を蒸発させ、希土類をコアガラス上に堆積させる
ようにする。The preforms from which these fibers are made are manufactured by applying the MCVD method. Specifically, as shown in FIG. 2, for example, when core glass is deposited in a pipe 14 that will become the cladding part of the preform, a dopant chamber 15 is provided adjacent to the pipe 14, and a dopant chamber 15 is placed in the dopant chamber 15. The rare earth raw material 16 (a chloride such as NdCj) is introduced into the dopant chamber 15 and heated to about 1000° C. to evaporate the rare earth raw material 16 and deposit the rare earth on the core glass.
これら各ファイバＡ−Ｃの損失波長特性を室温で測定し
た。この結果を第３図〜第５図に実線で示す。The loss wavelength characteristics of each of these fibers A-C were measured at room temperature. The results are shown in solid lines in FIGS. 3 to 5.
また、同様に各ファイバＡ−％−Ｃの２００℃における
損失波長特性を測定した。この結果は第３図〜第５図に
点線で示す。In addition, the loss wavelength characteristics at 200° C. of each fiber A-%-C were similarly measured. The results are shown in dotted lines in FIGS. 3-5.
第３図及び第４図に示すように、ファイバＡ、Ｂには吸
収損失に温度依存があることが表われている。このよう
に少なくとも光が伝搬する部分の一部にＥｕ、Ｎｄ
が添加された光ファイバＡ、Ｂは温度依存性を示す。な
お、Ｓｍ” Ｐｒ３＋についても同様な結果が得られ
た。As shown in FIGS. 3 and 4, it appears that the absorption loss of fibers A and B has a temperature dependence. In this way, at least a part of the part where light propagates is made of Eu, Nd.
Optical fibers A and B doped with . Note that similar results were obtained for Sm'' Pr3+.
一方、第５図に示すように、少なくとも光が伝搬する部
分の一部にＥｒが添加された光ファイバＣでは、０，６
５．ｍ、 ０．８／ｊ、 ０．９８声。On the other hand, as shown in FIG.
5. m, 0.8/j, 0.98 voice.
１．５３声に鋭い吸収ピークがｈられるが、室温と２０
０℃とにおける吸収の大きさはあまゆ大艶くなかった。A sharp absorption peak is observed at 1.53 degrees, but at room temperature and 20
The magnitude of the absorption at 0° C. was not so great.
これは、それぞれの吸収においては、例えば０．６５−
は ’ １＠／１＝ ” Ｉ／１゜８μは４■ →
Ｉ １．５３／！Ｊｌは ！ｌｌｉ／２→ ”
１３／２１！／２ ９／３’
というように、始状態が全て’１％１ａ（基底状態）で
あり、さらに、基底状態と第一励起状態とが離れている
ので、始状態のボビュレーシ璽ンが温度によってほとん
ど変わらないためと考えられている。したがって、希土
類原子のうち基底状態と第一励起状態とが離れているＧ
ｄ Ｄｙ Ｈｏ 、 Ｔｍ 、 Ｙｂ
は吸収の温度依存性が小さい。This is, for example, 0.65-
is ' 1＠/1= ” I/1゜8μ is 4■ →
I 1.53/! Jl is! lli/2→ ”
13/21! /2 9/3', all of the initial states are '1%1a (ground state), and furthermore, the ground state and the first excited state are far apart, so the Bobulasian curve of the initial state changes depending on the temperature. It is thought that this is because there is almost no difference. Therefore, among rare earth atoms, G
d Dy Ho, Tm, Yb
The temperature dependence of absorption is small.
このように、光ファイバのコア及びコアの周囲の伝搬光
のパワーが分布する部分の一部に少なくとも希土類原子
、特にＥｕ、Ｓｍ。In this way, at least rare earth atoms, especially Eu and Sm, are present in the core of the optical fiber and in a part of the area around the core where the power of propagating light is distributed.
Ｎｄ又はＰｒが含有されている場合に、吸収損失に温度
依存性が現われるので、このような光ファイバの長手方
向の損失分布を測定すれば長さ方向の温度分布を知るこ
とができる。When Nd or Pr is contained, temperature dependence appears in absorption loss, so by measuring the loss distribution in the longitudinal direction of such an optical fiber, it is possible to know the temperature distribution in the longitudinal direction.
したがって、−本の光ファイバを被対象物に沿って配置
することにより、被対象物の温度上昇箇所、表面温度分
布等を知ることができる。また、光ファイバは電磁界に
対して無誘導であるので、大電流が流れ、強磁場が発生
する電カケープルの導体表面に沿って配置すれば、当該
電カケープルの導体表面の長手方向の温度分布を測定す
ることができ、これにより導体の劣化具合を把握するこ
とが可能となる。Therefore, by arranging - optical fibers along the target object, it is possible to know the temperature rise point, surface temperature distribution, etc. of the target object. In addition, since optical fibers are not induced by electromagnetic fields, if they are placed along the conductor surface of an electric cable where a large current flows and a strong magnetic field is generated, the temperature distribution in the longitudinal direction of the conductor surface of the electric cable can be can be measured, which makes it possible to understand the degree of deterioration of the conductor.
実施例２
上述したファイバＡを用いて第６図に示すような光ファ
イバ分布温度センサを製作した。Example 2 An optical fiber distributed temperature sensor as shown in FIG. 6 was manufactured using the fiber A described above.
図中、２１は市販の後方散乱光強度譬（以下、０ＴＤＲ
と略す）である。０ＴＤＲは一般に波長が０．８５７ｎ
、 １．３．ｍ、 １．５５−のものが広く用いられて
いるが、本実施例では０．８５のものを用いた。との０
ＴＤＲ２１は通常の３Ｍファイバであるダミーファイバ
２２を介して５ｏｏｎのファイバＡである光ファイバ２
３と結合されている。０ＴＤＲ２１は、パｋ ス１１゜
調した信号光を光ファイバ２３に入力する手段と、光フ
ァイバ２３内で発生した後方散乱光出力を時間領域受信
するとともに平均化処理及び微分処理の信号処理をする
手段とを具えており、光ファイバ２３の長手方向の損失
分布をリアルタイムで測定することができる。In the figure, 21 is a commercially available backscattered light intensity example (hereinafter referred to as 0TDR).
). 0TDR generally has a wavelength of 0.857n
, 1.3. m, 1.55- is widely used, but in this example, one with 0.85 was used. 0 with
TDR21 connects optical fiber 2, which is 5oon fiber A, via dummy fiber 22, which is a normal 3M fiber.
It is combined with 3. The 0TDR 21 is a means for inputting the signal light whose path has been adjusted by 11 degrees into the optical fiber 23, receives the backscattered light output generated within the optical fiber 23 in the time domain, and performs signal processing such as averaging processing and differentiation processing. The loss distribution in the longitudinal direction of the optical fiber 23 can be measured in real time.
このようなセンサの光ファイバ２３の中央部１００ｍの
みを恒温槽に入れ、恒温槽の温度を３００”Ｋ（室温）
及び４７０°Ｋに設定し、それぞれの場合について０Ｔ
ＤＲ２１により波長０．８５１Ａの後方散乱特性を測定
した。Only the central 100m of the optical fiber 23 of such a sensor is placed in a thermostatic oven, and the temperature of the oven is set to 300"K (room temperature).
and 470°K, and 0T for each case.
Backscattering characteristics at a wavelength of 0.851 A were measured using DR21.
第７図が３００″″に１第８図が４７０＠にの場合の測
定結果である。単位長さ当りの損失は、後方散乱光強度
のファイバ長微分、すなわちｄα／ｄＬ（ｄＢ／単位長
）で表わされ、この値が第３図に示される通り温度と一
対一に対応する。したがって、このような後方散乱光特
性を測定し、後方散乱光強度のファイバ長微分を求める
ことにより、光ファイバ２３の長手方向の温度分布を把
握することができるＯ
第９図は、第８図の結果をファイバ長さしで微分し、温
度と対応させたグラフである。Figure 7 shows the measurement results at 300'', and Figure 8 shows the measurement results at 470@. The loss per unit length is expressed by the fiber length differential of the backscattered light intensity, ie, dα/dL (dB/unit length), and this value corresponds one-to-one to the temperature as shown in FIG. Therefore, by measuring such backscattered light characteristics and finding the fiber length differential of the backscattered light intensity, it is possible to understand the temperature distribution in the longitudinal direction of the optical fiber 23. This is a graph showing the results obtained by differentiating the results with respect to the fiber length and corresponding to the temperature.
このグラフより、光ファイバ２３の中央部１００ｍの部
分の温度が４７０″″Ｋまで上昇していることが明らか
である。From this graph, it is clear that the temperature of the central 100 m portion of the optical fiber 23 has risen to 470''K.
〈発明の効果〉
以上説明したように、本発明の光ファイバ温度センサは
、−本の光ファイバを被対象物に沿って配設することに
よりその光ファイバの長手方向に亘った温度分布を測定
することができるので、例えば従来、数百本の定温式ス
ポット型温度センサと数百本の銅ケーブルとが必要であ
った火災検知システムを、たった−本の光ファイバケー
ブルの配設だけで済ますことができ、経済的効果が大き
い。さらに、本発明のセンサはスパーク等の発生のおそ
れがなく、電磁界に対して無誘導なので、ガスタンク等
の強撚性物質貯蔵容器や電カケープルの導体表面の温度
もリアルタイムで測定できる。<Effects of the Invention> As explained above, the optical fiber temperature sensor of the present invention measures the temperature distribution over the longitudinal direction of the optical fiber by arranging the optical fiber along the target object. For example, a fire detection system that conventionally required hundreds of constant-temperature spot temperature sensors and hundreds of copper cables can now be installed with just one fiber optic cable. It has great economic effects. Further, since the sensor of the present invention has no fear of generating sparks and is non-inductive to electromagnetic fields, it can also measure the temperature of the conductor surface of a highly twisted material storage container such as a gas tank or a power cable in real time.
第１図は本発明の実施例の光ファイバの端面を示す説明
図、第２図はその光ファイバ用プリフォームの製造例を
示す説明図、第３図〜第５図はファイバＡ、Ｂ、Ｃの損
失波長特性を示すグラフ、第６・図は実施例にかかる光
ファイバ分布温度センサの外観図、第７ＷＡ及び第８図
はそれぞれ実施例における３００”Ｋ、４７０°Ｋにお
けろ後方散乱光の測定結果を示すグラフ、第９図は第８
図の状態の光ファイバの温度分布を示すグラフ、第１０
図は従来の定温式スポット型熱センサの原理図である。
図面中、
１１はコア、
１２はクラッド、
１３は被覆、
２１は後方散乱光測定器、
２２はダミーファイバ、
２３は光ファイバである。FIG. 1 is an explanatory diagram showing the end face of an optical fiber according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of manufacturing the optical fiber preform, and FIGS. 3 to 5 are illustrations of fibers A, B, Graph showing loss wavelength characteristics of C, Figure 6 is an external view of the optical fiber distribution temperature sensor according to the example, Figure 7WA and Figure 8 are backscattering at 300''K and 470°K in the example, respectively. A graph showing the light measurement results, Figure 9 is the 8th
Graph showing the temperature distribution of the optical fiber in the state shown in the figure, No. 10
The figure is a diagram showing the principle of a conventional constant temperature spot type thermal sensor. In the drawings, 11 is a core, 12 is a cladding, 13 is a coating, 21 is a backscattered light measuring device, 22 is a dummy fiber, and 23 is an optical fiber.
Claims (1)
含有されている光ファイバの吸収損失の温度依存性を利
用したことを特徴とする光ファイバ濃度センサ。 ２）光ファイバに含有される希土類原子がＥｕ、Ｓｍ、
Ｎｄ又はＰｒである請求項１記載の光ファイバ温度セン
サ。[Scope of Claims] 1) An optical fiber concentration sensor characterized by utilizing the temperature dependence of absorption loss of an optical fiber containing rare earth atoms in at least a part of the portion through which light propagates. 2) The rare earth atoms contained in the optical fiber are Eu, Sm,
The optical fiber temperature sensor according to claim 1, wherein the optical fiber temperature sensor is Nd or Pr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1001187A JPH02183130A (en) | 1989-01-09 | 1989-01-09 | Optical fiber temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1001187A JPH02183130A (en) | 1989-01-09 | 1989-01-09 | Optical fiber temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02183130A true JPH02183130A (en) | 1990-07-17 |
Family
ID=11494450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1001187A Pending JPH02183130A (en) | 1989-01-09 | 1989-01-09 | Optical fiber temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02183130A (en) |
-
1989
- 1989-01-09 JP JP1001187A patent/JPH02183130A/en active Pending
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