JPH0437373B2 - - Google Patents
Info
- Publication number
- JPH0437373B2 JPH0437373B2 JP58079865A JP7986583A JPH0437373B2 JP H0437373 B2 JPH0437373 B2 JP H0437373B2 JP 58079865 A JP58079865 A JP 58079865A JP 7986583 A JP7986583 A JP 7986583A JP H0437373 B2 JPH0437373 B2 JP H0437373B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- optical fiber
- sensitive
- detected
- memory alloy
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- 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)
Description
【発明の詳細な説明】
発明の分野
この発明は、長い区間にわたつて温度検知され
るべき場所を有する部分の温度異常を検知するた
めの装置に関するものである。たとえば具体的に
は、多点の温度異常の検知、炉壁や化学プラント
パイプの異常発熱の検知、炭鉱などのトンネル内
の温度異常の検知、冷却液化ガス管などの漏れに
よる温度異常の検知などに使用される装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for detecting temperature abnormalities in a part having a location whose temperature is to be detected over a long period of time. For example, specific examples include detection of temperature abnormalities at multiple points, detection of abnormal heat generation in furnace walls and chemical plant pipes, detection of temperature abnormalities in tunnels such as coal mines, detection of temperature abnormalities due to leaks in cooling liquefied gas pipes, etc. The invention relates to equipment used for.
先行技術の説明
上述されたような温度異常を検知するために
は、従来多くの熱電対を配線することが必要とさ
れていた。特に、長い区間にわたつて多点の温度
異常を検出するためには、各点ごとに１対の熱電
対（補償導線）が必要となり、そのため長い区間
にわたつて非常に多くの線を束にして使用するこ
とが必要とされていた。そして、測定点を増設す
るためには、新たに長い区間にわたる熱電対用配
線が必要とされていた。また、長い区間にわたつ
て配線されているので、途中で雑音を拾つたりし
て誤つた信号が伝達されることも多かつた。Description of the Prior Art In order to detect temperature abnormalities such as those described above, it has conventionally been necessary to wire many thermocouples. In particular, in order to detect temperature abnormalities at multiple points over a long section, one pair of thermocouples (compensating wires) is required for each point, which means that a large number of wires must be bundled over a long section. It was necessary to use it. In order to increase the number of measurement points, a new long section of thermocouple wiring was required. Furthermore, since the wiring spans a long distance, erroneous signals are often transmitted due to noise picked up along the way.
発明の目的
この発明は、上述されたような状況を鑑みてな
されたものであり、その主たる目的は、長い区間
にわたる部分での温度異常を検知する際に、太い
配線束を必要とすることなくかつ測定点の増設も
容易になされ、さらに誤信号の発生を減少させ得
る温度異常検知に適した装置を提供することであ
る。Purpose of the Invention This invention was made in view of the above-mentioned situation, and its main purpose is to detect temperature abnormalities over a long section without requiring thick wiring bundles. It is also an object of the present invention to provide a device suitable for temperature abnormality detection that allows for easy addition of measurement points and can further reduce the occurrence of erroneous signals.
より特定的には、この発明の目的は、光フアイ
バを用いて温度異常を検知するシステムにおい
て、異常温度が発生したとき、光フアイバに損傷
を与えることなく大きな機械的変形を与えること
によつて、光フアイバの光伝送損失を生じさせる
ことのできる感温収縮部材を提供することであ
る。 More specifically, an object of the present invention is to detect a temperature abnormality using an optical fiber by applying a large mechanical deformation to the optical fiber without damaging it when an abnormal temperature occurs. An object of the present invention is to provide a temperature-sensitive shrinkable member capable of causing optical transmission loss in an optical fiber.
この発明は、簡単に言えば、温度検知されるべ
き場所に位置する光フアイバの外周面上に配置さ
れ、異常温度に応じて収縮することによつて光フ
アイバに機械的変形を与える光フアイバ用感温収
縮部材である。 Simply put, this invention is for optical fibers that are placed on the outer circumferential surface of an optical fiber located at a location where temperature is to be detected, and which mechanically deforms the optical fiber by contracting in response to abnormal temperatures. It is a temperature-sensitive shrinkable member.
発明の構成および効果
この発明は、温度検知されるべき場所に位置す
る光フアイバの外周面上に配置され、異常温度に
応じて収縮することによつて光フアイバに機械的
変形を与える光フアイバ用感温収縮部材であつ
て、次のことを特徴とする。Structure and Effects of the Invention The present invention provides an optical fiber that is placed on the outer peripheral surface of an optical fiber located at a location where temperature is to be detected, and that mechanically deforms the optical fiber by contracting in response to abnormal temperature. This is a temperature-sensitive shrinkable member, and is characterized by the following features.
感温収縮部材は、検知されるべき温度の上限以
上もしくは下限以下の温度でその特性が変化する
形状記憶合金部材と、前記形状記憶合金部材に重
ね合わせて接合されたばね材とからなる全体とし
て筒状の構造を備える。筒状の一部には〓間部分
が形成されており、それによつて前記筒状をなす
感温収縮部材は、その径の拡張または収縮が容易
になされる。 The temperature-sensitive contraction member is a cylinder as a whole, which is made up of a shape memory alloy member whose characteristics change at a temperature above or below the upper limit or below the temperature to be detected, and a spring material overlapped and bonded to the shape memory alloy member. It has a structure like this. A part of the cylindrical part is formed with an intermediate part, so that the diameter of the cylindrical temperature-sensitive shrinkable member can be easily expanded or contracted.
形状記憶合金部材の特性の変化は、相転移によ
る結晶構造の変化に由来するものである。感温収
縮部材は、形状記憶合金部材が温度異常によつて
その特性を変化させたとき、収縮することによつ
て光フアイバを締付けこの光フアイバに機械的変
形を与える。光フアイバには、この締付けによつ
てマイクロベンドが生ずる。そして、マイクロベ
ンドの影響による光伝送損失を測定し、または反
射光の変化を測定することによつて、温度異常が
検知される。 Changes in the properties of shape memory alloy members originate from changes in crystal structure due to phase transition. The temperature-sensitive shrinkable member tightens the optical fiber by contracting when the shape memory alloy member changes its properties due to temperature abnormality, thereby imparting mechanical deformation to the optical fiber. This tightening causes microbends in the optical fiber. Temperature abnormalities are detected by measuring optical transmission loss due to the influence of microbending or by measuring changes in reflected light.
感温収縮部材は、形状記憶合金部材と、ばね材
とを接合した全体として筒状の構造を有してい
る。また、この筒状の感温収縮部材には隙間部分
が形成されている。簡単に言えば、感温収縮部材
は、いわゆるＣ字状の形態を有している。感温収
縮部材をこのような構造とすることにより、その
径の拡張または収縮が容易になり、その結果光フ
アイバに対して損傷を与えることなく大きな機械
的変形を与えることができるようになる。光フア
イバに対する締付けをさらに良好にするために、
全体として筒状をなす感温収縮部材の内壁に凸部
を形成してもよい。 The temperature-sensitive shrinkable member has an overall cylindrical structure in which a shape memory alloy member and a spring material are joined. Further, a gap portion is formed in this cylindrical temperature-sensitive shrinkable member. Simply put, the temperature-sensitive shrinkable member has a so-called C-shape. By structuring the temperature-sensitive shrink member in this manner, its diameter can be easily expanded or contracted, and as a result, large mechanical deformations can be applied to the optical fiber without damaging it. In order to better tighten the optical fiber,
A convex portion may be formed on the inner wall of the temperature-sensitive shrinkable member which has a generally cylindrical shape.
この発明に用いられる光フアイバとしては、正
確な温度異常検知を達成するために、好ましくは
マイクロベンドの影響に対して鋭敏なロスを生じ
るものが選ばれる。 In order to achieve accurate temperature abnormality detection, the optical fiber used in this invention is preferably one that exhibits a loss that is sensitive to the effects of microbending.
この発明によれば、異常温度によつて収縮する
感温収縮部材を光フアイバ上に配置し、感温収縮
部材の収縮によつて生ずる透過光のロスを測定
し、または反射光の変化を測定することによつて
温度異常を検知するものであるので、長い区間に
わたつて多点での温度異常検出が必要とされる場
合であつても、従来のように熱電対用の太い配線
束を必要とすることなく、コンパクトな光フアイ
バケーブルを配線するだけでよい。また、測定さ
れるべき点を新たに増設することも容易になされ
得る。なぜなら、測定されるべき点に感温収縮部
材を配置するだけでよいからである。さらに、光
フアイバを用いて温度異常を検知するものである
ので、途中で雑音を拾つたりすることがなく誤信
号の発生を極力減ずることができる。 According to this invention, a temperature-sensitive shrinkable member that contracts due to abnormal temperature is placed on an optical fiber, and the loss of transmitted light caused by the contraction of the temperature-sensitive shrinkable member is measured, or the change in reflected light is measured. This method detects temperature abnormalities by detecting temperature abnormalities by No need for compact fiber optic cables. Additionally, new points to be measured can be easily added. This is because it is only necessary to place the temperature-sensitive shrinkable member at the point to be measured. Furthermore, since temperature abnormalities are detected using optical fibers, no noise is picked up on the way, and the generation of erroneous signals can be reduced as much as possible.
この発明に従つた第１の実施例において、形状
記憶合金部材は、検知されるべき温度の上限以上
の温度でばね材の反発力よりも大きな力で収縮す
るようにされている。したがつて、検知されるべ
き温度の上限を超える異常温度が発生したときに
は、感温収縮部材は光フアイバを締付けることに
なり、こうして温度異常が検知される。この第１
の実施例は、実用的には室温より高温の温度異常
を検知するのに用いられることになろう。 In a first embodiment according to the invention, the shape memory alloy member is configured to contract with a force greater than the repulsive force of the spring material at a temperature above the upper limit of the temperature to be detected. Therefore, when an abnormal temperature exceeding the upper limit of the temperature to be detected occurs, the temperature-sensitive shrink member tightens the optical fiber, and thus the temperature abnormality is detected. This first
The embodiment would be practically used to detect temperature abnormalities higher than room temperature.
この発明に従つた第２の実施例において、形状
記憶合金部材は、検知されるべき温度の下限以下
の温度でその特性が変化するものである。そし
て、その特性の変化に応じて、検知されるべき温
度の下限以下の温度ではばね材の収縮力が形状記
憶合金部材の反発力よりも大きくなるようにされ
ている。したがつて、感温収縮部材は、検知され
るべき温度の下限を下回るような温度異常が発生
したとき、光フアイバを締付けることになり、こ
うして温度異常が検知されることになる。この第
２の実施例は、実用的には室温より低温の温度異
常を検知するのに用いられることになろう。 In a second embodiment according to the invention, the shape memory alloy member changes its properties at a temperature below the lower limit of the temperature to be detected. According to the change in the characteristics, the contractile force of the spring material is made larger than the repulsive force of the shape memory alloy member at a temperature below the lower limit of the temperature to be detected. Therefore, when a temperature abnormality below the lower limit of the temperature to be detected occurs, the temperature-sensitive shrinkable member tightens the optical fiber, and thus the temperature abnormality is detected. This second embodiment would be practically used to detect temperature abnormalities below room temperature.
実施例
実施例 １
光フアイバケーブルＡを直径約30ｍの炉壁外周
に配置し、第１図に示されるように、パルス光を
送信・受信する装置に接続した。そして、感温収
縮部材Ｂを、光フアイバケーブルＡの外周面上に
10ｍ間隔で10個配置し固定した。Examples Example 1 An optical fiber cable A was placed around the outer periphery of a furnace wall having a diameter of approximately 30 m, and was connected to a device for transmitting and receiving pulsed light as shown in FIG. Then, the temperature-sensitive shrinkable member B is placed on the outer peripheral surface of the optical fiber cable A.
10 pieces were placed and fixed at 10m intervals.
第２図は、感温収縮部材Ｂが光フアイバケーブ
ルＡ上に取付けられた部分を示す側面断面図であ
り、第３図はその正面断面図である。光フアイバ
ケーブルＡは、その中心部にコアクラツド１を有
し、その上にSi層２、さらにその上にナイロン被
覆３を有している。感温収縮部材Ｂは、筒状形状
の形状記憶合金部材４と、同じく筒状形状のステ
ンレスばね材５とを組合わせた構造となつてい
る。図示されるように、形状記憶合金部材４を、
ステンレスばね材５上に配置した。また、第３図
に示されるように、感温収縮部材Ｂは、断面形状
がＣ字状になるように隙間部分６を有するように
された。形状記憶合金部材４は、NiTi系合金で
あり、50℃以上の温度で収縮するように形状記憶
処理されている。 FIG. 2 is a side sectional view showing a portion where the temperature-sensitive shrinkable member B is attached to the optical fiber cable A, and FIG. 3 is a front sectional view thereof. The optical fiber cable A has a core clad 1 at its center, a Si layer 2 on top of it, and a nylon coating 3 on top of it. The temperature-sensitive contraction member B has a structure in which a shape memory alloy member 4 having a cylindrical shape is combined with a stainless steel spring material 5 also having a cylindrical shape. As illustrated, the shape memory alloy member 4 is
It was placed on a stainless steel spring material 5. Further, as shown in FIG. 3, the temperature-sensitive shrinkable member B had a gap portion 6 so that the cross-sectional shape was C-shaped. The shape memory alloy member 4 is a NiTi-based alloy, and is subjected to shape memory treatment so that it contracts at a temperature of 50° C. or higher.
炉壁で温度が50℃以上に昇温した箇所では、感
温収縮部材Ｂが収縮しようとした（この力は、温
度が50℃より高温になるほど大きく働いた）。こ
のとき光フアイバにマイクロベンドが生じた。し
たがつて、光フアイバ中を送信された光パルス
は、そのマイクロベンドの影響によつてロスを発
生した。こうして、透過光の光受信部でこのロス
を測定することによつて、温度異常（この場合50
℃以上）が検出できた。また、後方散乱損失を測
定することによつて、温度異常部も検出すること
が可能であつた。 At a location on the furnace wall where the temperature rose to 50°C or higher, the temperature-sensitive shrinkable member B tried to contract (this force worked more strongly as the temperature rose above 50°C). At this time, a microbend occurred in the optical fiber. Therefore, the optical pulse transmitted through the optical fiber has a loss due to the influence of the microbend. In this way, by measuring this loss at the optical receiver of the transmitted light, it is possible to detect temperature abnormalities (in this case, 50%).
℃ or higher) could be detected. Furthermore, by measuring backscattering loss, it was also possible to detect temperature abnormalities.
実施例 ２
第４図は第２図と同様な図であり、感温収縮部
材B′が光フアイバケーブルＡ上に取付けられて
いる部分を示す側面断面図であり、第５図はその
正面断面図である。感温収縮部材B′は、図示さ
れるように、光フアイバケーブルＡ上に配置され
る形状記憶合金部材７と、その上に配置されるば
ね材８とを組合わせた構造となつており、全体と
して筒状をなす形状であつた。さらに、第５図に
示されるように、断面形状がＣ字状となるように
隙間部分６を有するようにされた。形状記憶合金
部材７は、その変態温度が−50℃のCu−Zn−Al
合金からなり、その内周面に凸部９を有するもの
であつた。この形状記憶合金部材７は、−50℃以
下ではその結晶構造がマルテンサイト組織となり
軟らかくなるように熱処理されている。ばね材８
は、銅−ベリリウム合金からなるものであつた。
したがつて、感温収縮部材B′は、それが−50℃
以下となつたとき、ばね材８が光フアイバＡを締
付ける構造となつている。そして、感温収縮部材
B′が約−30℃以上になつたとき、形状記憶合金
部材７には逆変態が起ころうとしてばね材８を押
し拡げる力が発生する。Embodiment 2 FIG. 4 is a view similar to FIG. 2, and is a side sectional view showing the portion where the temperature-sensitive shrinkable member B' is attached to the optical fiber cable A, and FIG. 5 is a front sectional view thereof. It is a diagram. As shown in the figure, the temperature-sensitive contraction member B' has a structure that combines a shape memory alloy member 7 placed on the optical fiber cable A and a spring material 8 placed thereon. The overall shape was cylindrical. Further, as shown in FIG. 5, a gap portion 6 is provided so that the cross-sectional shape is C-shaped. The shape memory alloy member 7 is made of Cu-Zn-Al whose transformation temperature is -50°C.
It was made of an alloy and had a convex portion 9 on its inner peripheral surface. This shape memory alloy member 7 is heat-treated so that its crystal structure changes to martensitic structure and becomes soft at temperatures below -50°C. Spring material 8
was made of a copper-beryllium alloy.
Therefore, the temperature-sensitive shrinkable member B' is -50℃
The structure is such that the spring member 8 tightens the optical fiber A when the following conditions occur. And temperature-sensitive shrink material
When B' reaches approximately −30° C. or higher, reverse transformation is about to occur in the shape memory alloy member 7, and a force is generated that pushes the spring material 8 apart.
上述されたような感温収縮部材B′を、光フア
イバケーブルＡの外周面上に10ｍごとに１個ずつ
配置した。そして、第１図に示されるのと同様の
計器類を使用して、感温収縮部材B′が配置され
た光フアイバケーブルＡを、長さ１Kmの液化ガス
輸送管の外側に布設した。液化ガスの漏洩点では
温度が低下するので、その漏洩点に配置された感
温収縮部材B′は収縮し光フアイバＡを締付ける
こととなる。したがつて、感温収縮部材B′によ
つて締付けられた光フアイバＡにはマイクロベン
ドが生じ、この影響によつてロスが生ずる。こう
して、実施例１と同様に、温度異常が検出され
た。 The temperature-sensitive shrinkable members B' as described above were placed on the outer peripheral surface of the optical fiber cable A, one at every 10 m. Then, using instruments similar to those shown in FIG. 1, the optical fiber cable A, on which the temperature-sensitive shrinkable member B' was arranged, was laid outside the 1 km long liquefied gas transport pipe. Since the temperature decreases at the leak point of the liquefied gas, the temperature-sensitive contraction member B' placed at the leak point contracts and tightens the optical fiber A. Therefore, a microbend occurs in the optical fiber A tightened by the temperature-sensitive shrinkable member B', and a loss occurs due to this effect. In this way, as in Example 1, temperature abnormality was detected.
第１図ないし第５図はこの発明の実施例を説明
するための図である。第１図は、この発明を実施
するのに用いられる装置の一例であるパルス光の
送信・受信装置を示す図である。第２図は、この
発明の実施例１を実施する際に用いられた感温収
縮部材と光フアイバケーブルとの取付部分を示す
側面断面図であり、第３図はその正面断面図であ
る。第４図は、この発明の実施例２を実施する際
に用いられた感温収縮部材と光フアイバケーブル
との取付部分を示す側面断面図であり、第５図は
その正面断面図である。
図において、Ａは光フアイバケーブル、Ｂおよ
びB′は感温収縮部材、４および７は形状記憶合
金部材、５および８はばね材、６は隙間部分、９
は凸部を示す。
1 to 5 are diagrams for explaining embodiments of the present invention. FIG. 1 is a diagram showing a pulsed light transmitting/receiving device, which is an example of a device used to carry out the present invention. FIG. 2 is a side sectional view showing the attachment portion between the temperature-sensitive shrinkable member and the optical fiber cable used in carrying out Example 1 of the present invention, and FIG. 3 is a front sectional view thereof. FIG. 4 is a side sectional view showing the attachment portion between the temperature-sensitive shrinkable member and the optical fiber cable used in carrying out Example 2 of the present invention, and FIG. 5 is a front sectional view thereof. In the figure, A is an optical fiber cable, B and B' are temperature-sensitive shrinkable members, 4 and 7 are shape memory alloy members, 5 and 8 are spring materials, 6 is a gap part, and 9
indicates a convex portion.
Claims (1)
バの外周面上に配置され、異常温度に応じて収縮
することによつて光フアイバに機械的変形を与え
る光フアイバ用感温収縮部材において、 前記感温収縮部材は、検知されるべき温度の上
限以上もしくは下限以下の温度でその特性が変化
する形状記憶合金部材と、前記形状記憶合金部材
に重ね合わせて接合されたばね材とからなる全体
として筒状の構造を備え、 前記筒状の一部には〓間部分が形成されてお
り、それによつて前記筒状をなす感温収縮部材
は、その径の拡張または収縮が容易になされるこ
とを特徴とする、光フアイバ用感温収縮部材。 ２ 前記形状記憶合金部材は、検知されるべき温
度の上限以上の温度で前記ばね材の反発力よりも
大きな力で収縮するようにされていることを特徴
とする、特許請求の範囲第１項に記載の光フアイ
バ用感温収縮部材。 ３ 前記形状記憶合金部材は、検知されるべき温
度の下限以下の温度でその特性が変化し、その特
性の変化に応じて検知されるべき温度の下限以下
の温度では前記ばね材の収縮力が前記形状記憶合
金部材の反発力よりも大きくなることを特徴とす
る、特許請求の範囲第１項に記載の光フアイバ用
感温収縮部材。 ４ 前記感温収縮部材は全体として筒状をなし、
その内壁に凸部を有することを特徴とする、特許
請求の範囲第１項〜第３項のいずれか１項に記載
の光フアイバ用感温収縮部材。 ５ 前記光フアイバはマイクロベンドの影響に対
して鋭敏なロスを生じるものであることを特徴と
する、特許請求の範囲第１項〜第４項のいずれか
１項に記載の光フアイバ用感温収縮部材。[Claims] 1. A temperature sensor for optical fibers that is placed on the outer peripheral surface of an optical fiber located at a location where temperature is to be detected and that mechanically deforms the optical fiber by contracting in response to abnormal temperature. In the shrinkable member, the temperature-sensitive shrinkable member includes a shape memory alloy member whose characteristics change at a temperature above or below the upper limit or below the temperature to be detected, and a spring material overlapped and bonded to the shape memory alloy member. The temperature-sensitive contraction member having a cylindrical shape can easily expand or contract its diameter. 1. A temperature-sensitive shrink member for optical fiber, characterized in that: 2. Claim 1, wherein the shape memory alloy member is configured to contract with a force greater than the repulsive force of the spring material at a temperature higher than the upper limit of the temperature to be detected. The temperature-sensitive shrinkable member for optical fiber described in . 3. The properties of the shape memory alloy member change at a temperature below the lower limit of the temperature to be detected, and according to the change in the properties, the contractile force of the spring material changes at a temperature below the lower limit of the temperature to be detected. The temperature-sensitive shrinkable member for optical fiber according to claim 1, wherein the repulsive force is greater than the repulsive force of the shape memory alloy member. 4. The temperature-sensitive shrinkable member has a cylindrical shape as a whole,
The temperature-sensitive shrinkable member for optical fiber according to any one of claims 1 to 3, characterized in that the inner wall thereof has a convex portion. 5. The temperature-sensitive optical fiber according to any one of claims 1 to 4, characterized in that the optical fiber exhibits a loss sensitive to the influence of microbending. Shrinkage member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58079865A JPS59203929A (en) | 1983-05-06 | 1983-05-06 | Detection of temperature abnormality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58079865A JPS59203929A (en) | 1983-05-06 | 1983-05-06 | Detection of temperature abnormality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59203929A JPS59203929A (en) | 1984-11-19 |
| JPH0437373B2 true JPH0437373B2 (en) | 1992-06-19 |
Family
ID=13702093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58079865A Granted JPS59203929A (en) | 1983-05-06 | 1983-05-06 | Detection of temperature abnormality |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59203929A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0617833B2 (en) * | 1985-01-09 | 1994-03-09 | 住友電気工業株式会社 | Temperature detector |
| JPS6269131A (en) * | 1985-09-24 | 1987-03-30 | Fujikura Ltd | Optical fiber temperature sensor |
| SE468229B (en) * | 1989-10-02 | 1992-11-23 | Survoir Ltd | OPTICAL FIBER CABLE FOR DETECTING A TEMPERATURE CHANGE |
| FR2706606B1 (en) * | 1993-06-15 | 1995-07-21 | Thomson Csf | Reconfigurable fiber optic sensor. |
| FR2706607B1 (en) * | 1993-06-15 | 1995-07-21 | Thomson Csf | Reconfigurable multi-point temperature sensor. |
| WO1998010478A1 (en) * | 1996-09-06 | 1998-03-12 | Hitachi, Ltd. | SYSTEM FOR OPERATING, MAINTAINING AND MANAGING Na/MOLTEN SALT CELL |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5682421A (en) * | 1979-12-10 | 1981-07-06 | Hitachi Ltd | Apparatus overheat detection device |
| JPS56155822A (en) * | 1980-05-07 | 1981-12-02 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber thermostat |
| JPS56158929A (en) * | 1980-05-13 | 1981-12-08 | Fuji Electric Co Ltd | Temperature detector |
| JPS57133407A (en) * | 1981-02-12 | 1982-08-18 | Fujitsu Ltd | Optical fiber |
| JPS5824043U (en) * | 1981-08-07 | 1983-02-15 | 日本電気株式会社 | temperature measuring device |
-
1983
- 1983-05-06 JP JP58079865A patent/JPS59203929A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59203929A (en) | 1984-11-19 |
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