JPH0333214B2 - - Google Patents
Info
- Publication number
- JPH0333214B2 JPH0333214B2 JP59050676A JP5067684A JPH0333214B2 JP H0333214 B2 JPH0333214 B2 JP H0333214B2 JP 59050676 A JP59050676 A JP 59050676A JP 5067684 A JP5067684 A JP 5067684A JP H0333214 B2 JPH0333214 B2 JP H0333214B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- shape memory
- temperature
- memory alloy
- cable
- 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 - Lifetime
Links
- 239000013307 optical fiber Substances 0.000 claims description 57
- 238000001514 detection method Methods 0.000 claims description 37
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 36
- 125000006850 spacer group Chemical group 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical group [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 claims description 3
- 229910017518 Cu Zn Inorganic materials 0.000 claims description 2
- 229910017752 Cu-Zn Inorganic materials 0.000 claims description 2
- 229910017943 Cu—Zn Inorganic materials 0.000 claims description 2
- 229910004337 Ti-Ni Inorganic materials 0.000 claims description 2
- 229910011209 Ti—Ni Inorganic materials 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 239000011162 core material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000006399 behavior Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 230000003446 memory effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- -1 Al-based Inorganic materials 0.000 description 1
- 229910000925 Cd alloy Inorganic materials 0.000 description 1
- 229910017755 Cu-Sn Inorganic materials 0.000 description 1
- 229910017773 Cu-Zn-Al Inorganic materials 0.000 description 1
- 229910017927 Cu—Sn Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
- G01K5/483—Measuring temperature based on the expansion or contraction of a material the material being a solid using materials with a configuration memory, e.g. Ni-Ti alloys
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は温度検知ケーブルに関する。更に詳し
くは、ある特定の温度を長手方向に沿つて検知す
るための温度検知ケーブルに関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature sensing cable. More specifically, the present invention relates to a temperature detection cable for detecting a specific temperature along the longitudinal direction.
従来技術
光通信用の新媒体として開発された光フアイバ
は近年その伝送損失が著しく改良され減少してき
たことにより光フアイバ自体を長光路干渉計とし
て応用する方向が開かれつつある。即ち、光フア
イバをセンサそのものとして利用しようとする動
向がみられる。Prior Art Optical fibers, which were developed as a new medium for optical communications, have been significantly improved and reduced in transmission loss in recent years, and as a result, the use of optical fibers themselves as long-path interferometers is opening up. That is, there is a trend toward using optical fibers as sensors themselves.
例えば、光フアイバを温度センサとして使用す
る方法として、光フアイバに光を入射し、その後
方散乱光の距離特性から光フアイバに沿つた長手
方向の温度変化に関する情報を得ることからなる
方法が知られている。この方法は更に、第１図に
示すように後方散乱光強度の差から温度情報を得
る場合と、第２図に示すように後方散乱特性の傾
きに着目し、これから温度情報を得るという２つ
の方法に大別される。 For example, a known method for using an optical fiber as a temperature sensor consists of injecting light into the optical fiber and obtaining information about longitudinal temperature changes along the optical fiber from the distance characteristics of the backscattered light. ing. This method further has two methods: one is to obtain temperature information from the difference in backscattered light intensity, as shown in Figure 1, and the other is to obtain temperature information from the slope of the backscattering characteristics, as shown in Figure 2. It is broadly divided into methods.
前者の場合には光フアイバのコアとしては温度
依存性の高いレーリー散乱係数を有する材質が選
ばれる。一方、後者の場合には光フアイバ自体に
温度に依存する側圧または曲げを強制的に与えて
歪をもたせておき、光フアイバの伝送損失を部分
的に増加させている。 In the former case, a material having a highly temperature-dependent Rayleigh scattering coefficient is selected for the core of the optical fiber. On the other hand, in the latter case, the optical fiber itself is forcibly subjected to temperature-dependent lateral pressure or bending to cause distortion, thereby partially increasing the transmission loss of the optical fiber.
また、Au−Cd合金について初めて見出されて
以来、最近「形状記憶合金」と呼ばれる興味ある
挙動を示す合金について種々の研究がなされ、各
種応用開発が盛んになつてきている。中でも可逆
的に変形するいわゆる可逆形状記憶効果を有する
ものが応用範囲が広く、特に疲労強度が高いもの
が作られるようになつており、例えば104〜105回
程度の形状記憶効果を繰り返しにも耐え得るもの
が得られるようになつてきている。 Furthermore, since the Au-Cd alloy was first discovered, various studies have recently been conducted on alloys that exhibit interesting behavior called "shape memory alloys," and various applications are being developed. Among these, those that have a so-called reversible shape memory effect, which deforms reversibly, have a wide range of applications, and products with particularly high fatigue strength are being made. I'm starting to be able to get things that I can live with.
このような光フアイバ並びに形状記憶合金の最
近の動向に照らして、これらの特性を組合せるこ
とにより、新たな応用分野を開拓することは光フ
アイバ並びに形状記憶合金の両分野において極め
て意義あることといえよう。 In light of recent trends in optical fibers and shape memory alloys, it is of great significance to develop new application fields by combining these properties in both the optical fiber and shape memory alloy fields. Yes.
発明の目的
そこで、本発明の目的はある特定の温度をケー
ブルの長手方向に沿つて検知することを可能とす
る温度検知ケーブルを提供することにある。OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a temperature detection cable that makes it possible to detect a specific temperature along the length of the cable.
発明の構成
本発明者等は上記のような光フアイバをセンサ
そのものとして利用しようとする動向並びに可逆
的形状記憶効果の繰り返しに対する耐疲労特性の
優れた形状記憶合金の開発に着目し、これらの新
たな応用技術を開発すべく鋭意検討した結果、光
フアイバをこれに側圧が加わるような形状を記憶
させた形状記憶合金と組合せ、該側圧に基づく光
フアイバの伝送損失を検知することにより新規な
温度検知ケーブルを得ることができることを見出
し、本発明を完成した。Structure of the Invention The present inventors have focused on the trend of using optical fibers as sensors themselves as described above and the development of shape memory alloys with excellent fatigue resistance against repeated reversible shape memory effects, and have developed these new As a result of intensive research to develop a new application technology, we combined an optical fiber with a shape-memory alloy that memorizes its shape so that lateral pressure is applied to it, and detected the transmission loss of the optical fiber based on the lateral pressure. The inventors have discovered that it is possible to obtain a detection cable, and have completed the present invention.
即ち、本発明の温度検知ケーブルは、検知すべ
き温度において、部分的もしくは完全に接触して
いる光フアイバに側圧を与えるような形状を記憶
させた形状記憶合金と、これと前記の如く接触し
ている光フアイバと、前記形状記憶合金および光
フアイバを前記接触状態を保つたまま収納する収
納用溝を具備するスペーサとで構成されているこ
とを特徴とする。 That is, the temperature detection cable of the present invention is in contact with a shape memory alloy that has a shape that memorizes a shape that applies lateral pressure to the optical fiber that is in partial or complete contact at the temperature to be detected, as described above. and a spacer having a storage groove for storing the shape memory alloy and the optical fiber while maintaining the contact state.
本発明の温度検知ケーブルを用いた検知方法は
従来法に関して前記した第２図の場合、即ち光フ
アイバに強制的な側圧あるいは曲げを与えて伝送
損失を増大させることからなる温度検知法に属す
るが、本発明では光フアイバ自身に側圧あるいは
曲げを与える代わりに、光フアイバをそのままと
し、特定のMS点（マルテンサイト変態開始温度）
を有する形状記憶合金の変形により光フアイバに
対する側圧を発生させているので光フアイバの長
手方向の局所的な温度変化でさえも検知可能であ
り、測定精度も高くなる。 The detection method using the temperature detection cable of the present invention belongs to the case of the conventional method shown in FIG. 2, that is, the temperature detection method that involves applying forced side pressure or bending to the optical fiber to increase transmission loss. In the present invention, instead of applying lateral pressure or bending to the optical fiber itself, the optical fiber is left as it is and the temperature is set at a specific MS point (martensite transformation starting temperature).
Since lateral pressure is generated against the optical fiber by deformation of the shape memory alloy having the shape memory alloy, it is possible to detect even local temperature changes in the longitudinal direction of the optical fiber, and measurement accuracy is also increased.
本発明で使用する形状記憶合金としては、例え
ば、Ag−Cd系、Au−Cd系、Cu−Al−Bi系、Cu
−Au−Zn系、Cu−Zn系、Cu−Sn系、Cu−Zn−
Ｘ（Ｘ＝Si、Sn、Al、Ga）系、In−Ti系、Ni−
Al系、Ti−Ni系、Fe−Pt系、Fe−Pd系各合金
等従来公知の各種のものを使用することができ
る。特に、現在実用化が著しくかつ入手容易であ
ることからTi−Ni系およびCu−Zn−Al系合金を
使用することが好ましい。 Shape memory alloys used in the present invention include, for example, Ag-Cd series, Au-Cd series, Cu-Al-Bi series, Cu
-Au-Zn system, Cu-Zn system, Cu-Sn system, Cu-Zn-
X (X=Si, Sn, Al, Ga) system, In-Ti system, Ni-
Various conventionally known alloys such as Al-based, Ti-Ni-based, Fe-Pt-based, and Fe-Pd-based alloys can be used. In particular, it is preferable to use Ti--Ni alloys and Cu--Zn--Al alloys because they are currently in practical use and are easily available.
これら形状記憶合金はその組成を適当に変化さ
せることによりMS点即ちマルテンサイト変態開
始温度を調節することができる。例えば、上記
Ni−Ti系合金では50〜100℃、Cu−Zn−Al系合
金では−180〜100℃の範囲でMSを変え得ること
がわかつている。従つて、合金組成を適当に選
び、MS点を調節することによりかなり広い温度
範囲に亘り、検知温度を設定することが可能とな
る。 By appropriately changing the composition of these shape memory alloys, the M S point, that is, the temperature at which martensitic transformation begins, can be adjusted. For example, above
It is known that M S can be varied in the range of 50 to 100°C for Ni-Ti alloys and -180 to 100°C for Cu-Zn-Al alloys. Therefore, by appropriately selecting the alloy composition and adjusting the M S point, it is possible to set the detection temperature over a fairly wide temperature range.
更に、本発明の温度検知器において使用する光
フアイバとしては従来公知のいかなるものであつ
てもよく、従つてシングルモード型もしくはマル
チモード型でも、ステツプインデツクス型もしく
はグレートインデツクス型であつてもよい。 Furthermore, the optical fiber used in the temperature sensor of the present invention may be of any conventionally known type, such as single mode or multimode type, step index type or great index type. good.
本発明の温度検知ケーブルの組立てに当たつて
は、まず検知すべき温度において例えば直線状態
をとるように形状記憶合金に形状を記憶させ、こ
れをルースな状態で光フアイバ心線の回りに巻き
付けて完成される。 When assembling the temperature detection cable of the present invention, first the shape memory alloy is made to memorize its shape so that it assumes, for example, a straight line at the temperature to be detected, and then it is loosely wound around the optical fiber core wire. completed.
本発明の温度検知器ケーブルのとり得る構成
は、上記のようにルースな状態で心線に巻き付け
る他に、位置精度が余り要求されない場合には適
当な間隔で不連続状に形状記憶合金を心線に巻き
付けた構成とすることも可能である。 Possible configurations of the temperature sensor cable of the present invention include, in addition to winding the core wire loosely as described above, if positional accuracy is not required, shape memory alloy may be wound discontinuously at appropriate intervals. It is also possible to have a configuration in which it is wound around a wire.
形状記憶合金と光フアイバ心線とをこのような
構成で組合せることにより、被測定体の温度が検
知温度でない場合には、形状記憶合金は光フアイ
バに何等影響を与えず、むしろ外圧から心線とし
ての光フアイバを保護する機能を果たすが、被測
定温度が検知温度と一致した場合には該形状記憶
合金は記憶させた直線状態に戻ろうとする結果、
光フアイバに側圧を及ぼすことになり、側圧を受
けた光フアイバはその部分において伝送損失量を
増大させる。この際、光フアイバに光が入射され
ていれば、その後方散乱光をモニタすることによ
り第２図に示したように、検知温度（To）とな
つた部分のみに段差を生じ、この段差の位置から
被検体の温度Toにある部分の位置を推定するこ
とができる。 By combining the shape memory alloy and the optical fiber in this configuration, when the temperature of the object to be measured is not the detection temperature, the shape memory alloy does not affect the optical fiber in any way, but rather protects it from external pressure. It functions to protect the optical fiber as a wire, but when the measured temperature matches the detected temperature, the shape memory alloy tries to return to the memorized linear state.
A lateral pressure is exerted on the optical fiber, and the optical fiber subjected to the lateral pressure increases the amount of transmission loss in that portion. At this time, if light is incident on the optical fiber, by monitoring the backscattered light, a step will be created only in the part where the detected temperature (To) is reached, as shown in Figure 2. From the position, it is possible to estimate the position of the part of the object at the temperature To.
尚、検知温度を異にする複数の上記の如き本発
明の温度検知ケーブルを組合せて使用し、被検体
の温度分布を知ることもできる。 It is also possible to use a combination of a plurality of temperature detection cables of the present invention having different detection temperatures to determine the temperature distribution of the subject.
更に、本発明の温度検知ケーブルは、これを収
納することができ、スペーサの長手方向に沿つて
その表面上に設けられた溝を有するスペーサで支
持し、この状態で使用することもできる。 Further, the temperature detection cable of the present invention can be housed, supported by a spacer having a groove provided on its surface along the length of the spacer, and used in this state.
このようなスペーサを利用することにより、形
状記憶合金に検知温度にて螺旋形状をとるように
形状記憶させ、これを直線状態で前記スペーサの
溝内に光フアイバと一緒に収納することにより、
被検体の温度が検知温度となつた際に形状記憶合
金を螺旋形状に変形させることができ、これによ
つて光フアイバに側圧を与えるという構成をとる
ことも可能となる。 By using such a spacer, the shape memory alloy is made to memorize a spiral shape at the detected temperature, and by storing it in a straight state together with the optical fiber in the groove of the spacer,
When the temperature of the object reaches the detection temperature, the shape memory alloy can be deformed into a spiral shape, thereby making it possible to apply lateral pressure to the optical fiber.
更に、スペーサに複数のケーブル収納用溝を形
成し、夫々の溝に検知温度の異なる温度検知ケー
ブルを１つ当て収納することにより、複数の異な
る温度を検知できる温度検知ケーブルを得ること
も可能である。 Furthermore, by forming multiple cable storage grooves in the spacer and storing one temperature detection cable with a different detection temperature in each groove, it is also possible to obtain a temperature detection cable that can detect multiple different temperatures. be.
実施例
以下、添付図面を参照しつつ記載する実施例に
より、本発明を一層具体的に説明する。ただし、
本発明の範囲はこれら実施例により何等制限され
ない。Examples Hereinafter, the present invention will be explained in more detail by Examples described with reference to the accompanying drawings. however,
The scope of the present invention is not limited in any way by these Examples.
第１図及び第２図は夫々光フアイバ長に対して
後方散乱光強度をプロツトしたものである。第１
図は温度センサとして光フアイバ自身を使用し、
光フアイバコア材として温度依存性の高いレーリ
ー散乱係数を有するものを使用した場合の後方散
乱光強度差の変動を示している。このような構成
の方法によれば一般的に後方散乱光強度は光フア
イバ長の増大に伴つて直線的に単調減少するが温
度変化があつた場合には、例えば温度T1→T0な
る変化に対応して後方散乱光強度に変動を生ず
る。 FIGS. 1 and 2 are plots of backscattered light intensity versus optical fiber length, respectively. 1st
The figure uses the optical fiber itself as a temperature sensor,
This figure shows the variation in backscattered light intensity difference when an optical fiber core material having a highly temperature-dependent Rayleigh scattering coefficient is used. According to a method with such a configuration, generally the backscattered light intensity decreases linearly and monotonically as the optical fiber length increases, but when there is a temperature change, for example, the temperature changes from T 1 to T 0 . The backscattered light intensity varies accordingly.
一方、第２図のような後方散乱光強度の挙動、
即ち段差の出現は、温度変化を圧力変化として検
知する従来の方法（強制的に光フアイバに温度に
依存する側圧あるいは曲げを与えた場合）および
以下で説明する本発明の温度検知ケーブルを使用
した場合に相当する。 On the other hand, the behavior of the backscattered light intensity as shown in Figure 2,
In other words, the appearance of the step can be detected by using the conventional method of detecting temperature changes as pressure changes (by forcibly applying temperature-dependent lateral pressure or bending to the optical fiber) and by using the temperature detection cable of the present invention described below. corresponds to the case.
第３図〜第５図は本発明の温度検知ケーブルの
構成を説明するための模式的な図である。まず、
第３図では形状記憶合金１に検知温度T0におい
て直線状態を記憶させ、次いでこれをルースな状
態で光フアイバ心線２上に巻き付けた状態を示し
ている。これは検知温度T0以外の温度に置かれ
た状態を示すものである。このような構成にある
温度検知ケーブルが検知温度T0の状態に置かれ
た場合には、第４図に示すように形状記憶合金１
は記憶させられた直線状態に戻ろうとして光フア
イバに密に接し側圧を及ぼす。光を入射しその後
方散乱光をモニタすれば第２図に示すように検知
温度T0にさらされた部分のみにおいて後方散乱
光強度に段差を生じる。 FIGS. 3 to 5 are schematic diagrams for explaining the configuration of the temperature detection cable of the present invention. first,
FIG. 3 shows a state in which the shape memory alloy 1 is made to memorize a linear state at the detected temperature T 0 and then is loosely wound around the optical fiber core 2 . This indicates the state of being placed at a temperature other than the detected temperature T 0 . When the temperature detection cable with such a configuration is placed in a state of detection temperature T 0 , the shape memory alloy 1
In an attempt to return to the memorized straight state, the fiber comes into close contact with the optical fiber and exerts lateral pressure. If light is incident and the backscattered light is monitored, a step will occur in the intensity of the backscattered light only in the portion exposed to the detected temperature T 0 as shown in FIG.
更に第５図は第３図に示したと同様な形状記憶
合金並びに光フアイバを用いた別の態様を示すも
のであり、この態様では第３図及び第４図に示し
されたと同様な形状記憶合金１′が断続的に所定
の間隔で光フアイバ２に巻き付けられている。こ
れは前述のように検知位置の精度がさほど重要で
ない場合に利用できる。 Furthermore, FIG. 5 shows another embodiment using a shape memory alloy and optical fiber similar to that shown in FIG. 3, in which a shape memory alloy similar to that shown in FIGS. 1' is intermittently wound around the optical fiber 2 at predetermined intervals. This can be used when the accuracy of the detected position is not so important as described above.
第６図及び第７図は本発明の温度検知ケーブル
を、収納用溝を有するスペーサに収納した状態を
断面図で示したものである。第６図では上記第３
図並びに第５図に示したような態様の温度検知ケ
ーブル３がスペーサ４にその長手方向に沿つて設
けられた溝５内に収納された状態を示している。
また、第７図では第６図と同様なスペーサ４の溝
５に直線状に形状記憶合金６と光フアイバ２とが
収納されている。この態様では形状記憶合金１と
光フアイバ２とが第３図及び第５図とは異なつた
態様で組合されて温度検知ケーブルを構成してい
る。即ち、検知温度T0において螺旋形状を有す
るように形状を記憶させ、その他の温度において
は直線となるようにした形状記憶合金を使用して
いる。この形状記憶合金が検知温度T0に置かれ
た場合には、記憶された螺旋形に戻ろうとして横
方向に占有空間を増大させるので、光フアイバに
側圧がかかるようになつている。 FIGS. 6 and 7 are sectional views showing the temperature detection cable of the present invention housed in a spacer having a housing groove. In Figure 6, the above 3rd
The temperature detection cable 3 shown in the figure and FIG. 5 is shown housed in a groove 5 provided in the spacer 4 along its longitudinal direction.
Further, in FIG. 7, a shape memory alloy 6 and an optical fiber 2 are housed linearly in a groove 5 of a spacer 4 similar to that in FIG. 6. In this embodiment, the shape memory alloy 1 and the optical fiber 2 are combined in a manner different from that shown in FIGS. 3 and 5 to constitute a temperature sensing cable. In other words, a shape memory alloy is used that has a spiral shape at the detection temperature T 0 and a straight shape at other temperatures. When this shape memory alloy is placed at a detection temperature T 0 , it tries to return to its memorized helical shape and increases the space it occupies in the lateral direction, so that lateral pressure is applied to the optical fiber.
第６図および第７図に示した態様においては、
スペーサ４に設けられた複数の溝の各々に検知温
度の異なる形状記憶合金１６1〜６3を夫々１個当
て光フアイバ２と組合せた別種の複数の温度検知
ケーブルを挿入する態様も可能である。 In the embodiment shown in FIGS. 6 and 7,
It is also possible to insert a plurality of different types of temperature detection cables in which one shape memory alloy 16 1 to 6 3 with different detection temperatures is applied to each of the plurality of grooves provided in the spacer 4 in combination with the optical fiber 2 . .
発明の効果
本発明の形状記憶合金と光フアイバとを組合せ
た新規温度検知ケーブルを使用すれば、従来の光
フアイバのみによる温度検知法と比較して、光フ
アイバの長手方向における局所的な温度変化でさ
えも高精度で測定することができる。即ち、形状
記憶合金はその組成を適当に調節してMS点を変
化させることにより、広範な温度範囲で、しかも
特定の温度を確実に検知することが可能となるか
らである。Effects of the Invention By using the novel temperature detection cable that combines the shape memory alloy and optical fiber of the present invention, local temperature changes in the longitudinal direction of the optical fiber can be improved compared to the conventional temperature detection method using only the optical fiber. even can be measured with high precision. That is, by appropriately adjusting the composition of the shape memory alloy and changing the M S point, it becomes possible to reliably detect a specific temperature over a wide temperature range.
第１図及び第２図は光フアイバを利用した温度
検知法における後方散乱光強度を光フアイバの長
さに対してプロツトしたグラフを示す図であり、
第３図〜第５図は本発明の温度検知ケーブルの構
成並びに作用を説明するための図であり、第６図
及び第７図は本発明の温度検知ケーブルを、スペ
ーサの収納溝に収納した態様を示す断面図であ
る。
（主な参照番号）１，１′，６1〜６3……形状
記憶合金、２……光フアイバ、３……温度検知ケ
ーブル、４……スペーサ、５……ケーブル収納用
溝。
FIGS. 1 and 2 are diagrams showing graphs in which backscattered light intensity in a temperature detection method using an optical fiber is plotted against the length of the optical fiber.
Figures 3 to 5 are diagrams for explaining the structure and operation of the temperature detection cable of the present invention, and Figures 6 and 7 show the temperature detection cable of the present invention stored in the storage groove of the spacer. It is a sectional view showing an aspect. (Main reference numbers) 1, 1', 6 1 to 6 3 ... Shape memory alloy, 2 ... Optical fiber, 3 ... Temperature detection cable, 4 ... Spacer, 5 ... Cable storage groove.
Claims (1)
バに、検知温度において側圧を与えることのでき
る形状を記憶させた形状記憶合金と、これと前記
の如く接触している光フアイバと、前記形状記憶
合金および光フアイバを前記接触状態を保つたま
ま収納する収納用溝を具備するスペーサとから構
成される温度検知ケーブル。 ２ 前記形状記憶合金が検知温度において直線状
態をとるように形状記憶されており、これが光フ
アイバにゆるく巻き付けられていることを特徴と
する特許請求の範囲第１項記載のケーブル。 ３ 前記形状記憶合金が不連続状に所定の間隔を
置いて光フアイバに巻き付けられていることを特
徴とする特許請求の範囲第２項記載のケーブル。 ４ 前記温度検知ケーブルが、検知温度において
螺旋形をとるように形状記憶させた形状記憶合金
と、光フアイバとを直線状に並置した構成を有し
ていることを特徴とする特許請求の範囲第１項記
載のケーブル。 ５ 前記スペーサが複数のケーブル収納用溝を有
しており、検知温度を異にする複数のケーブルを
収納していることを特徴とする特許請求の範囲第
１項または第４項記載のケーブル。 ６ 前記形状記憶合金がTi−Ni系およびCu−Zn
−Al系合金からなる群から選ばれることを特徴
とする特許請求の範囲第１〜５項のいずれか１項
記載のケーブル。[Scope of Claims] 1. A shape memory alloy that has a shape memory that can apply lateral pressure at a detection temperature to an optical fiber that is in partial or complete contact with the optical fiber, and an optical fiber that is in contact with the alloy as described above. and a spacer having a storage groove for storing the shape memory alloy and the optical fiber while maintaining the contact state. 2. The cable according to claim 1, wherein the shape memory alloy has a shape memorized so as to assume a linear state at a detection temperature, and is loosely wound around an optical fiber. 3. The cable according to claim 2, wherein the shape memory alloy is wound discontinuously around an optical fiber at predetermined intervals. 4. Claim 4, characterized in that the temperature detection cable has a structure in which a shape memory alloy whose shape is memorized so as to assume a spiral shape at the detection temperature and an optical fiber are arranged in a straight line. Cable described in item 1. 5. The cable according to claim 1 or 4, wherein the spacer has a plurality of cable storage grooves and stores a plurality of cables having different detected temperatures. 6 The shape memory alloy is Ti-Ni based and Cu-Zn
- The cable according to any one of claims 1 to 5, characterized in that the cable is selected from the group consisting of Al-based alloys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59050676A JPS60195429A (en) | 1984-03-16 | 1984-03-16 | Temperature detecting cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59050676A JPS60195429A (en) | 1984-03-16 | 1984-03-16 | Temperature detecting cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60195429A JPS60195429A (en) | 1985-10-03 |
| JPH0333214B2 true JPH0333214B2 (en) | 1991-05-16 |
Family
ID=12865537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59050676A Granted JPS60195429A (en) | 1984-03-16 | 1984-03-16 | Temperature detecting cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60195429A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10342268B4 (en) * | 2002-09-13 | 2015-08-20 | Denso Corporation | Pumpenanormalitätsdiagnosevorrichtung |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61221628A (en) * | 1985-03-28 | 1986-10-02 | Japan Steel & Tube Constr Co Ltd | Temperature detecting device for disaster prevention system |
| JPH01285828A (en) * | 1988-05-13 | 1989-11-16 | Yazaki Corp | Cable for detection of temperature |
| EP2359114A2 (en) * | 2008-11-17 | 2011-08-24 | Sensortran, Inc. | High spatial resolution fiber optic temperature sensor |
| GB2509530B (en) * | 2013-01-07 | 2015-11-11 | Kidde Tech Inc | Optical fibre distributed LHD with SMA element for discrete alarm |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6090640U (en) * | 1983-11-28 | 1985-06-21 | 古河電気工業株式会社 | Optical composite cable for temperature detection |
-
1984
- 1984-03-16 JP JP59050676A patent/JPS60195429A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10342268B4 (en) * | 2002-09-13 | 2015-08-20 | Denso Corporation | Pumpenanormalitätsdiagnosevorrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60195429A (en) | 1985-10-03 |
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