JP2010096553A - Optical fiber water intrusion sensor - Google Patents

Optical fiber water intrusion sensor Download PDF

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JP2010096553A
JP2010096553A JP2008265776A JP2008265776A JP2010096553A JP 2010096553 A JP2010096553 A JP 2010096553A JP 2008265776 A JP2008265776 A JP 2008265776A JP 2008265776 A JP2008265776 A JP 2008265776A JP 2010096553 A JP2010096553 A JP 2010096553A
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optical fiber
casing
water
swelling
detection sensor
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JP5203123B2 (en
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Kazunori Yamamoto
和憲 山本
Keiichi Saito
恵一 齋藤
Mika Shimozaki
美香 下崎
Yoshitaka Enomoto
圭高 榎本
Tsuneichi Watanabe
常一 渡邉
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Furukawa Electric Co Ltd
Nippon Telegraph and Telephone Corp
Seiwa Giken KK
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Furukawa Electric Co Ltd
Nippon Telegraph and Telephone Corp
Seiwa Giken KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber water immersion sensor, capable of detecting the generation of water immersion accident at a plurality of spots, while reducing the wavelength dependence. <P>SOLUTION: An optical fiber 30 is inserted into a casing 20, having a structure into which water may infiltrate, and a swellable member 42 swelling by water absorption is accommodated therein. When a water immersion accident occurs, the swellable member 42 swells due to water absorption. The optical fiber 30 is thereby pushed and bent, to increase the transmission loss of the optical fiber 30. By prescribing the maximum bending radius then to be equal to or less than 4 mm, wavelength dependence of the amount of increase in the transmission loss is suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、通信ケーブルの浸水事故を検知するためのセンサ技術に関する。   The present invention relates to a sensor technique for detecting a flooding accident of a communication cable.

光ファイバケーブルなどを伝送路に用いた通信システムにおいては、ケーブル同士の接続部における浸水事故が問題となるため、ケーブルの同士の各接続部の近傍に浸水検知センサを設置し、浸水事故の発生およびその発生位置を検知できるようにしている。   In communication systems that use optical fiber cables or the like for transmission lines, inundation accidents at the connection between cables become a problem. And the generation position can be detected.

この種の浸水検知センサとして、透水性を有するケーシング内に光ファイバを挿通するとともに、吸水時に体積膨張する膨潤部材を収容したものが知られている（特許文献１、特許文献２）。この浸水検知センサは、浸水によってケーシング内に水が入ると、その水分を吸水した膨潤部材が膨張し、ケーシング内に挿通されている光ファイバを押し曲げる仕組みになっている。したがって、この光ファイバの曲がりによる伝送損失の増加を検知することにより、浸水事故の発生およびその発生位置を検知することができる。
特開昭６３−２２８１０５号公報 特開平８−２３３７２６号公報 As this type of infiltration detection sensor, a sensor in which an optical fiber is inserted into a water-permeable casing and a swelling member that expands in volume when water is absorbed is known (Patent Documents 1 and 2). This water detection sensor is configured such that when water enters the casing due to water immersion, the swelling member that has absorbed the water expands and pushes and bends the optical fiber inserted in the casing. Therefore, by detecting an increase in transmission loss due to the bending of the optical fiber, it is possible to detect the occurrence of a flood accident and the position where it occurs.
JP 63-228105 A JP-A-8-233726

光ファイバの曲がりによる伝送損失の増加量は多分に伝送光の波長に依存するが、上述した従来の浸水検知センサは、波長依存性を何ら考慮することなく、浸水検知に使用する光ファイバの伝送損失が単に増加したことをもって浸水事故の発生を検知するものであった。また、浸水事故発生時における伝送損失の増加量が大きいため、１線路上に浸水検知センサを複数個設置できないという問題があった。   The increase in transmission loss due to bending of the optical fiber depends largely on the wavelength of the transmitted light. However, the above-described conventional inundation detection sensor transmits the optical fiber used for inundation detection without considering any wavelength dependency. The occurrence of inundation accidents was detected by simply increasing the loss. Further, since the increase in transmission loss at the time of a flood accident is large, there is a problem that a plurality of flood detection sensors cannot be installed on one line.

本発明が解決しようとする課題は、波長依存性を軽減するとともに、１線路上の複数箇所に設置して浸水事故の発生およびその発生位置を検知できる光ファイバ浸水検知センサを提供することにある。   The problem to be solved by the present invention is to provide an optical fiber inundation detection sensor that can reduce wavelength dependency and can be installed at a plurality of locations on one line to detect the occurrence of an inundation accident and its occurrence position. .

上記課題を解決するために、本発明の光ファイバ浸水検知センサは、水が浸入する構造のケーシング内に光ファイバを挿通するとともに吸水膨張する膨潤部材を収容し、浸水事故発生時に当該膨潤部材が吸水膨張することにより当該光ファイバが押し曲げられて、当該光ファイバの伝送損失が増加するように構成した光ファイバ浸水検知センサにおいて、前記膨潤部材が吸水膨張することにより前記光ファイバが押し曲げられた際の最大曲げ半径が４ｍｍ以下になるように構成したことを特徴とするものである。   In order to solve the above problems, an optical fiber intrusion detection sensor according to the present invention accommodates a swelling member that penetrates an optical fiber and absorbs water and expands into a casing having a structure in which water enters, and the swelling member is In the optical fiber submergence detection sensor configured to increase the transmission loss of the optical fiber by the water absorption expansion, the optical fiber is pressed and bent by the water expansion of the swelling member. In this case, the maximum bending radius is 4 mm or less.

本発明の光ファイバ浸水検知センサにおいて、前記最大曲げ半径は２ｍｍ〜３ｍｍであることがより好ましい。
前記最大曲げ半径を３ｍｍ以下に規定することにより、吸水膨張した膨潤部材により光ファイバが押し曲げられた際の伝送損失の増加量の波長依存を抑えるとともに、光ファイバの押し曲げによる伝送損失の増加量を、浸水事故の発生に起因して特徴的に増加させることができる。光ファイバの曲がりによる伝送損失の増加量は、前記最大曲げ半径が小さいほど増加するが、前記最大曲げ半径を２ｍｍよりも小さくすると、吸水膨張した膨潤部材により光ファイバが押し曲げられた際の伝送損失の増加量が過大となり、光ファイバ浸水検知センサを１本の光ファイバに複数個配置することができなくなる。 In the optical fiber flood detection sensor of the present invention, it is more preferable that the maximum bending radius is 2 mm to 3 mm.
By specifying the maximum bending radius to be 3 mm or less, the wavelength dependence of the increase in transmission loss when the optical fiber is pushed and bent by the swelling member that has absorbed and expanded water is suppressed, and the increase in transmission loss due to the bending of the optical fiber is suppressed. The quantity can be characteristically increased due to the occurrence of a flood accident. The amount of increase in transmission loss due to bending of the optical fiber increases as the maximum bending radius decreases. However, if the maximum bending radius is smaller than 2 mm, transmission when the optical fiber is pushed and bent by the swelling member that absorbs water and expands. The amount of increase in loss becomes excessive, and a plurality of optical fiber flood detection sensors cannot be arranged on one optical fiber.

さらに、本発明の光ファイバ浸水検知センサは、前記膨潤部材が吸水膨張することにより前記光ファイバが押し曲げられた際の伝送損失の増加量が特定の波長に対して２ｄＢ〜１２ｄＢになるように構成されていることが望ましい。
前記膨潤部材により前記光ファイバが押し曲げられた際の伝送損失の増加量を２ｄＢ以上に規定することにより、光ファイバの押し曲げによる伝送損失の増加量を、ＭＴコネクタ接続、融着接続などによる接続点で生じる最大１ｄＢ近くの損失との誤認を避けることができる。一方、前記膨潤部材により前記光ファイバが押し曲げられた際の伝送損失の増加量が特定の波長に対して１２ｄＢよりも大きくなると、伝送損失の増加量が過大となり、光ファイバ浸水検知センサを１本の光ファイバに複数個設置することができなくなる。 Furthermore, the optical fiber submergence detection sensor of the present invention is such that the increase in transmission loss when the optical fiber is pushed and bent by the swelling expansion of the swelling member is 2 dB to 12 dB with respect to a specific wavelength. It is desirable to be configured.
By defining the amount of increase in transmission loss when the optical fiber is bent by the swelling member to be 2 dB or more, the amount of increase in transmission loss due to the bending of the optical fiber depends on MT connector connection, fusion connection, etc. It is possible to avoid misidentification of a loss near 1 dB at the maximum occurring at the connection point. On the other hand, if the increase amount of the transmission loss when the optical fiber is pushed and bent by the swelling member becomes larger than 12 dB with respect to a specific wavelength, the increase amount of the transmission loss becomes excessive, and the optical fiber submergence detection sensor becomes 1 It becomes impossible to install a plurality of optical fibers.

本発明の光ファイバ浸水検知センサによれば、これを１本の光ファイバに複数個設置することにより、波長依存性を抑えて、複数箇所における浸水事故の発生を検知できる。   According to the optical fiber inundation detection sensor of the present invention, by installing a plurality of optical fiber inundation detection sensors on one optical fiber, it is possible to detect the occurrence of inundation accidents at a plurality of locations while suppressing wavelength dependency.

以下、本発明を実施するための最良の形態について図面を参照して説明する。
図１は本発明の光ファイバ浸水検知センサ（以下、浸水検知センサと記す。）の形態例を示す正面図である。図２は図１示す浸水検知センサの部分破断断面図である。図３は図１示す浸水検知センサの分解図である。 The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing an embodiment of an optical fiber flood detection sensor (hereinafter referred to as a flood detection sensor) according to the present invention. FIG. 2 is a partially cutaway sectional view of the water immersion detection sensor shown in FIG. FIG. 3 is an exploded view of the inundation detection sensor shown in FIG.

この浸水検知センサ１０は、ケーシング２０内に、光ファイバ３０を挿通するとともに、光ファイバ３０を押し曲げる押し曲げ部材４０と、押し曲げ部材４０を受ける受け部材５０とを有する。   The intrusion detection sensor 10 includes a push-bending member 40 that pushes and bends the optical fiber 30 and a receiving member 50 that receives the push-bending member 40 while inserting the optical fiber 30 into the casing 20.

ケーシング２０は、押し曲げ部材５０を収容した第1のケーシング要素２０Ａと、受け部材５０を有する第2のケーシング要素２０Ｂとからなる。両ケーシング要素２０Ａ、２０Ｂは、透明な樹脂成型品である。   The casing 20 includes a first casing element 20 </ b> A that accommodates the push-bending member 50 and a second casing element 20 </ b> B that includes the receiving member 50. Both casing elements 20A and 20B are transparent resin molded products.

第１のケーシング要素２０Ａは、押し曲げ部材４０を収容するケーシング要素本体２１と、板状の蓋体２２とを有している。ケーシング要素本体２１の正面には、押し曲げ部材４０を交換するための交換口２３が形成されており、この交換口２３を閉塞するようにして蓋体２２が設けられている。ケーシング要素本体２１は、蓋体２２と対向する背板部２６（図２、図３（Ｂ））と、背板部２６の左右両端縁に形成された側壁部２７ａ、２７ｂと、背板部２６の下端縁に形成された底板部２８とを有している。蓋体２２と背板部２６には、浸水事故発生時にケーシング２０内に水を流入させるための導水口２９ａ、２９ｂがそれぞれ形成されている。   The first casing element 20 </ b> A includes a casing element main body 21 that accommodates the push-bending member 40 and a plate-like lid body 22. An exchange port 23 for exchanging the push-bending member 40 is formed on the front surface of the casing element main body 21, and a lid 22 is provided so as to close the exchange port 23. The casing element main body 21 includes a back plate portion 26 (FIGS. 2 and 3B) facing the lid body 22, side wall portions 27 a and 27 b formed at both left and right edges of the back plate portion 26, and a back plate portion. 26 and a bottom plate portion 28 formed at the lower end edge of the H.26. The lid body 22 and the back plate portion 26 are formed with water inlets 29a and 29b for allowing water to flow into the casing 20 when a flood accident occurs.

ケーシング要素本体２１の正面左右両端部には、蓋体２２を上下方向（図１中の矢印Ｘ方向）にスライド自在に案内する蓋体ガイド部２４が形成されている。ケーシング要素本体２１の左右両側壁２７ａ、２７ｂの内側には、押し曲げ部材４０を上下方向（図１中の矢印Ｘ方向）にスライド可能に案内する押し曲げ部材ガイド部２５ａ、２５ｂが形成されている。なお、図１中の矢印Ｘ方向は、ケーシング２０に挿通された光ファイバ３０の軸と直交する方向である。   A lid body guide portion 24 that slidably guides the lid body 22 in the vertical direction (the direction indicated by the arrow X in FIG. 1) is formed at both the front left and right ends of the casing element main body 21. On the inner sides of the left and right side walls 27a and 27b of the casing element main body 21, push-bending member guide portions 25a and 25b for guiding the push-bending member 40 so as to be slidable in the vertical direction (the arrow X direction in FIG. 1) are formed. Yes. In addition, the arrow X direction in FIG. 1 is a direction orthogonal to the axis of the optical fiber 30 inserted through the casing 20.

蓋体２２と背板部２６の上端部は、第2のケーシング要素２０Ｂ内に挿入されている（図４参照）。背板部２６の上端部の左右両側には、両ケーシング要素２０Ａ、２０Ｂを互いに係脱自在に連結するための弾性変形する係止爪部３１（図）３（Ｂ）と、係止爪部３１と第2のケーシング要素２０Ｂとの係合を解除するための操作部３２とが形成されている。操作部３２は第2のケーシング要素２０Ｂの左右両側面から突出しており、両操作部３２を指で挟んで両側から押圧することにより、係止爪部３１と第2のケーシング要素２０Ｂとの係合が解除されるようになっている。   The upper end portions of the lid body 22 and the back plate portion 26 are inserted into the second casing element 20B (see FIG. 4). On the left and right sides of the upper end portion of the back plate portion 26, an elastically deforming locking claw portion 31 (FIG.) 3 (B) for engaging and disengaging both casing elements 20A and 20B to each other, and a locking claw portion An operation portion 32 for releasing the engagement between the first casing element 31 and the second casing element 20B is formed. The operation portion 32 protrudes from the left and right side surfaces of the second casing element 20B, and the engagement claw portion 31 and the second casing element 20B are engaged with each other by pressing both operation portions 32 with fingers. The match is released.

第２のケーシング要素２０Ｂは、図４に示すように、前後の側壁部３３ａ、３３ｂの間に板状の受け部材５０を有している。そして、前後の側壁部３３ａ、３３ｂと受け部材５０との間に、蓋体２２の上端部と背板部２６の上端部をそれぞれ受け入れるスリット５１、５２が形成されている。第2のケーシング要素２０Ｂの左右の側壁部３５ａ、３５ｂの内面には、図３（Ａ）に示すように係止溝３７が形成されており、各係止溝３７に各係止爪部３１の先端が係脱自在に係合する。また、第2のケーシング要素２０Ｂの左右の側壁部３５ａ、３５ｂの下部には、係止爪部３１と操作部３２の連結部３８を受け入れるスリット３９ａ、３９ｂが形成されている。   As shown in FIG. 4, the second casing element 20B has a plate-shaped receiving member 50 between the front and rear side wall portions 33a and 33b. Between the front and rear side wall portions 33 a and 33 b and the receiving member 50, slits 51 and 52 for receiving the upper end portion of the lid 22 and the upper end portion of the back plate portion 26 are formed. As shown in FIG. 3 (A), locking grooves 37 are formed on the inner surfaces of the left and right side wall portions 35a, 35b of the second casing element 20B. The tip of the slidably engages. In addition, slits 39 a and 39 b that receive the engaging claw portion 31 and the connecting portion 38 of the operation portion 32 are formed in the lower portions of the left and right side wall portions 35 a and 35 b of the second casing element 20 </ b> B.

ケーシング２０の左右両側面部には、ケーシング２０内に光ファイバ３０を挿通するための挿通口２０ａ、２０ｂが設けられている。両挿通口２０ａ、２０ｂは、両ケーシング要素２０Ａ、２０Ｂを連結したときに両ケーシング要素２０Ａ、２０Ｂの側壁部同士の間、すなわち側壁部２７ａと３５ａの間、側壁部２７ｂと３５ａの間にできる隙間により形成される。そして、押し曲げ部材４０と受け部材５０との間に光ファイバ３０が挿通されている。   Insertion openings 20 a and 20 b for inserting the optical fiber 30 into the casing 20 are provided on the left and right side surfaces of the casing 20. Both insertion ports 20a and 20b are formed between the side wall portions of the two casing elements 20A and 20B, that is, between the side wall portions 27a and 35a and between the side wall portions 27b and 35a when the two casing elements 20A and 20B are connected. It is formed by a gap. The optical fiber 30 is inserted between the push bending member 40 and the receiving member 50.

押し曲げ部材４０は、ケーシング２０内に挿通された光ファイバ３０を押圧する押圧部材４１と、浸水事故発生時に押圧部材４１を光ファイバ３０に押し当てる手段として働く膨潤部材４２とを有している。   The pushing / bending member 40 includes a pressing member 41 that presses the optical fiber 30 inserted into the casing 20, and a swelling member 42 that functions as a means for pressing the pressing member 41 against the optical fiber 30 when a flooding accident occurs. .

押圧部材４１は樹脂成型品である。押圧部材４１は、透明なケーシング２０の外からその位置を容易に視認できるように着色（例えば黒に着色）されている。   The pressing member 41 is a resin molded product. The pressing member 41 is colored (for example, colored black) so that its position can be easily visually recognized from the outside of the transparent casing 20.

押圧部材４１の受け部材５０側には、中央に角張った頂部４３ａを有しその頂部４３ａから左右両側に直線状に延びる傾斜面４３ｂ、４３ｃを有する山形の押圧部４３を有している。押圧部４３は、その左右の傾斜面４３ｂ、４３ｃが成す内角の角度θが１４０°〜１４２°の範囲に規定されている（図３（Ｄ）参照）。当該角度θを１４０°〜１４２°の範囲に規定したことにより、押し曲げ部材５０により光ファイバ３０が押し曲げられた際の最大曲げ半径が２ｍｍ〜３ｍｍに規定される。   On the receiving member 50 side of the pressing member 41, there is a mountain-shaped pressing portion 43 having an inclined top portion 43a at the center and inclined surfaces 43b, 43c extending linearly from the top portion 43a to the left and right sides. In the pressing portion 43, an inner angle θ formed by the left and right inclined surfaces 43b and 43c is defined in a range of 140 ° to 142 ° (see FIG. 3D). By defining the angle θ in the range of 140 ° to 142 °, the maximum bending radius when the optical fiber 30 is pushed and bent by the pushing and bending member 50 is specified to be 2 mm to 3 mm.

受け部材５０には、押圧部４３と嵌合する谷形の受圧部５１が形成されている。受圧部５１の最奥部５１ａ、すなわち押圧部４３の頂部４３ａと対向する部分は、光ファイバ３０が押圧部４３に押し曲げられて、押圧部４３と受圧部５１との間に挟まれたときに、光ファイバ３０の曲率が最も大きくなる部分との間に確実に隙間が生じるように円弧状に陥没している。   The receiving member 50 is formed with a valley-shaped pressure receiving portion 51 that fits with the pressing portion 43. When the optical fiber 30 is pressed and bent by the pressing portion 43, the innermost portion 51 a of the pressure receiving portion 51, that is, the portion facing the top portion 43 a of the pressing portion 43 is sandwiched between the pressing portion 43 and the pressure receiving portion 51. In addition, the optical fiber 30 is depressed in an arc shape so that a gap is surely formed between the portion where the curvature of the optical fiber 30 is maximized.

膨潤部材４２は、アクリル酸・ビニルアルコール共重合体、アクリル酸重合体、アクリル酸・アクリルアミド共重合体、ポリエチレンオキサイド変生物、カルボキシセルロース・アクリル酸グラフト重合体、澱粉グラフト重合体などの吸水性高分子、或いは吸水性高分子と熱可塑性樹脂や熱可塑性エラストマーとの混合物などの膨潤性材料からなる矩形状の部材である。膨潤部材４２は、押圧部材４１とケーシング要素本体２１の底板部２８との間に設けられている。この実施形態においては、膨潤部材４２は、接着などの方法により押圧部材４１と結合されて一体化している。   The swelling member 42 has high water absorption such as acrylic acid / vinyl alcohol copolymer, acrylic acid polymer, acrylic acid / acrylamide copolymer, polyethylene oxide metabolite, carboxycellulose / acrylic acid graft polymer, starch graft polymer. It is a rectangular member made of a swellable material such as a mixture of molecules or a water-absorbing polymer and a thermoplastic resin or a thermoplastic elastomer. The swelling member 42 is provided between the pressing member 41 and the bottom plate portion 28 of the casing element main body 21. In this embodiment, the swelling member 42 is combined and integrated with the pressing member 41 by a method such as adhesion.

上記のように構成された浸水検知センサ１０は、第１のケーシング要素２０Ａの両操作部３２を一方の手の指で挟んで両側から押圧した状態で、他方の手で第２のケーシング要素２０Ｂを摘んで、第1のケーシング要素２０Ａと第２のケーシング要素２０Ｂを互いに離間する向きに引くことにより、両ケーシング要素２０Ａ、２０Ｂを容易に分離することができる。そして、分離した両ケーシング要素２０Ａ、２０Ｂで光ファイバ３０を挟み込むようにして、両ケーシング要素２０Ａ、２０Ｂを互いに連結することにより、光ファイバ３０に容易に装着することができる。装着完了時、押し曲げ部材４０が光ファイバ３０とケーシング要素本体２１の底板部２８との間に挟まれた状態になる。このとき、押し曲げ部材４０の押圧部材４１は受け部材５０から最大限離間した状態にある。   The infiltration detection sensor 10 configured as described above has the second casing element 20B with the other hand in a state in which both the operation portions 32 of the first casing element 20A are sandwiched between fingers of one hand and pressed from both sides. And pulling the first casing element 20A and the second casing element 20B away from each other, the two casing elements 20A and 20B can be easily separated. And it can mount | wear with the optical fiber 30 easily by connecting both casing elements 20A and 20B mutually so that the optical fiber 30 may be pinched | interposed with both separated casing elements 20A and 20B. When the mounting is completed, the push-bending member 40 is sandwiched between the optical fiber 30 and the bottom plate portion 28 of the casing element main body 21. At this time, the pressing member 41 of the pushing and bending member 40 is in a state of being maximally separated from the receiving member 50.

図２（Ａ）はこの時の状態（初期状態）を示している。光ファイバ３０が押圧部材４１の頂部４３ａに接触して若干曲がった状態になるが、この曲がりは光ファイバ３０の伝送損失を増大させない程度に抑えられている。浸水検知センサ１０を光ファイバ３０に装着した後、浸水事故が発生しなければ、光ファイバ３０の伝送損失はこの初期状態から変化しない。   FIG. 2A shows the state at this time (initial state). The optical fiber 30 comes into contact with the top 43a of the pressing member 41 and is bent slightly. This bending is suppressed to the extent that the transmission loss of the optical fiber 30 is not increased. After the infiltration detection sensor 10 is attached to the optical fiber 30, the transmission loss of the optical fiber 30 does not change from this initial state unless a flood accident occurs.

浸水事故が発生すると、ケーシング２０内に水が流入し、膨潤部材４２が吸水膨張するため、押圧部材４１が膨潤部材４２に押されて受圧部５１側に移動する。その結果、光ファイバ３０が押圧部材４１により押し曲げられる。そして最終的には、光ファイバ３０が押圧部材４１の押圧部４３と受け部材５０の受圧部５１とで挟圧された状態になる。図２（Ｂ）はこの時の状態を示しており、光ファイバ３０が押圧部４３の形状に倣って変形している。この時の光ファイバ３０の曲げ半径Ｒは２ｍｍ〜３ｍｍであり、光ファイバ３０の曲がりによる伝送損失の増加量が最大になる。したがって、この伝送損失の増加を検知することにより、浸水事故の発生およびその発生位置を検知することができる。   When a flood accident occurs, water flows into the casing 20 and the swelling member 42 absorbs and expands. Therefore, the pressing member 41 is pushed by the swelling member 42 and moves to the pressure receiving portion 51 side. As a result, the optical fiber 30 is pushed and bent by the pressing member 41. Finally, the optical fiber 30 is sandwiched between the pressing portion 43 of the pressing member 41 and the pressure receiving portion 51 of the receiving member 50. FIG. 2B shows the state at this time, and the optical fiber 30 is deformed following the shape of the pressing portion 43. The bending radius R of the optical fiber 30 at this time is 2 mm to 3 mm, and the amount of increase in transmission loss due to the bending of the optical fiber 30 is maximized. Therefore, by detecting this increase in transmission loss, it is possible to detect the occurrence of a flood accident and its location.

上記のように、この実施形態の浸水検知センサ１０は、光ファイバ３０の曲げ損失を極力小さくするように角度θを規定している。そして、光ファイバ３０の最大曲げ半径Ｒが２ｍｍ〜３ｍｍになるように、押し曲げ機構を構成する押圧部材４１および受け部材５０の形状が規定されているので、浸水事故の発生およびその発生位置を波長依存性を抑えて正確に検知することができる。なお、最大曲げ半径Ｒを３ｍｍ以下に規定することにより、光ファイバ３０の押し曲げによる伝送損失の増加量を、浸水事故の発生に起因して特徴的に増加させることができる。一方、最大曲げ半径Ｒを２ｍｍよりも小さくすると、光ファイバ３０が押し曲げによる伝送損失の増加量が過大となり、この浸水検知センサ１を１本の光ファイバ３０に複数個配置することができなくなる。   As described above, the inundation detection sensor 10 of this embodiment defines the angle θ so as to minimize the bending loss of the optical fiber 30. And since the shape of the pressing member 41 and the receiving member 50 which comprise a pushing bending mechanism is prescribed | regulated so that the maximum bending radius R of the optical fiber 30 may be 2 mm-3 mm, generation | occurrence | production of a flood accident and its occurrence position are determined. It is possible to accurately detect the wavelength dependence. In addition, by defining the maximum bending radius R to 3 mm or less, it is possible to increase characteristically the increase in transmission loss due to the push bending of the optical fiber 30 due to the occurrence of a flooding accident. On the other hand, if the maximum bending radius R is smaller than 2 mm, the amount of increase in transmission loss due to the optical fiber 30 being pushed and bent becomes excessive, and a plurality of the water immersion detection sensors 1 cannot be disposed on one optical fiber 30. .

また、この実施形態の浸水検知センサ１０は、第1のケーシング要素２０Ａの蓋体２２をスライドさせて一旦取り外すことにより、押し曲げ部材５０を交換するための交換口２３を開放できるので、浸水検知センサ１０そのものは光ファイバ３０から取り外すことなく、押し曲げ部材５０だけを交換することができる。したがって、極めてメンテナンスが容易である。   Further, the inundation detection sensor 10 of this embodiment can open the exchange port 23 for exchanging the push-bending member 50 by sliding and removing the lid body 22 of the first casing element 20A. Without removing the sensor 10 itself from the optical fiber 30, only the push-bending member 50 can be replaced. Therefore, maintenance is extremely easy.

また、この実施形態では、受圧部５１の最奥部５１ａを円弧状に陥没させたことにより、受圧部５１の最奥部５１ａと押圧部４３の頂部４３ａとの間に若干位置ずれか生じても、光ファイバ３０の曲率を押圧部４３の頂部４３ａの角度によって正確に規定できる。   Further, in this embodiment, since the innermost part 51a of the pressure receiving part 51 is depressed in an arc shape, a slight positional deviation occurs between the innermost part 51a of the pressure receiving part 51 and the top part 43a of the pressing part 43. In addition, the curvature of the optical fiber 30 can be accurately defined by the angle of the top portion 43 a of the pressing portion 43.

なお、上記の例では、押圧部材４１と膨潤部材４２とが一体化しているが、両者が分離した構成を採用することもできる。   In the above example, the pressing member 41 and the swelling member 42 are integrated, but a configuration in which both are separated can also be adopted.

また、上記の例では、光ファイバ３０の最大曲げ半径Ｒが２ｍｍ〜３ｍｍになるようにしたが、最大曲げ半径Ｒは４ｍｍ以下であればよい。また、前記角度θは、好ましくは１４０°〜１４２°であるが、１３５°〜１４５°でも実現可能である。更に、光ファイバ３０が押し曲げられた際の伝送損失の増加量が特定の波長（例えば、１５３０〜１６５５ｎｍ）に対して２ｄＢ〜１０ｄＢになるように構成することが望ましい。   In the above example, the maximum bending radius R of the optical fiber 30 is 2 mm to 3 mm, but the maximum bending radius R may be 4 mm or less. In addition, the angle θ is preferably 140 ° to 142 °, but can be realized even from 135 ° to 145 °. Furthermore, it is desirable that the transmission loss increase amount when the optical fiber 30 is bent is 2 dB to 10 dB with respect to a specific wavelength (for example, 1530 to 1655 nm).

本発明の浸水検知センサの形態例を示す正面図The front view which shows the form example of the inundation detection sensor of this invention （Ａ）：図１示す浸水検知センサの浸水事故未発生時の状態を例示する部分破断断面図 （Ｂ）：図１示す浸水検知センサの浸水事故発生時の状態を例示する部分破断断面図(A): Partially broken sectional view illustrating the state of the inundation detection sensor shown in FIG. 1 when no inundation accident has occurred (B): Partially broken sectional view illustrating the state of the inundation detection sensor shown in FIG. （Ａ）：第２のケーシング要素の正面図 （Ｂ）：ケーシング要素本体の正面図 （Ｃ）：蓋体の正面図 （Ｄ）：押し曲げ部材の正面図(A): Front view of second casing element (B): Front view of casing element main body (C): Front view of lid (D): Front view of pushing and bending member 図３（Ａ）のＡ−Ａ断面図AA sectional view of FIG.

符号の説明Explanation of symbols

１０ 光ファイバ浸水検知センサ
２０ ケーシング
２０Ａ 第１のケーシング要素
２０Ｂ 第２のケーシング要素
２０ａ、２０ｂ 挿通口
２２ 蓋体
２３ 交換口
２９ａ、２９ｂ 導水口
３０ 光ファイバ
４０ 押し曲げ部材
４１ 押圧部材
４２ 膨潤部材
４３ 押圧部
５０ 受け部材 DESCRIPTION OF SYMBOLS 10 Optical fiber intrusion detection sensor 20 Casing 20A 1st casing element 20B 2nd casing element 20a, 20b Insertion port 22 Lid body 23 Exchange port 29a, 29b Water inlet 30 Optical fiber 40 Push-bending member 41 Pressing member 42 Swelling member 43 Press part 50 receiving member

Claims (3)

水が浸入する構造のケーシング内に光ファイバを挿通するとともに吸水膨張する膨潤部材を収容し、浸水事故発生時に当該膨潤部材が吸水膨張することにより当該光ファイバが押し曲げられて、当該光ファイバの伝送損失が増大するように構成した光ファイバ浸水検知センサにおいて、
前記膨潤部材が吸水膨張することにより前記光ファイバが押し曲げられた際の最大曲げ半径が４ｍｍ以下になるように構成したことを特徴とする光ファイバ浸水検知センサ。 An optical fiber is inserted into a casing having a structure that allows water to enter, and a swelling member that absorbs and expands is accommodated, and when the inundation accident occurs, the swelling member absorbs and expands, whereby the optical fiber is pushed and bent. In an optical fiber flood detection sensor configured to increase transmission loss,
An optical fiber intrusion detection sensor configured to have a maximum bend radius of 4 mm or less when the optical fiber is pushed and bent due to water swelling of the swelling member. 前記最大曲げ半径が２ｍｍ〜３ｍｍである請求項１の光ファイバ浸水検知センサ。   The optical fiber intrusion detection sensor according to claim 1, wherein the maximum bending radius is 2 mm to 3 mm. 前記膨潤部材が吸水膨張することにより前記光ファイバが押し曲げられた際の伝送損失の増加量が特定の波長に対して２ｄＢ〜１２ｄＢになるように構成した請求項１または２の光ファイバ浸水検知センサ。   3. The optical fiber flood detection according to claim 1, wherein an increase in transmission loss when the optical fiber is pushed and bent due to water-swelling expansion of the swelling member is 2 dB to 12 dB with respect to a specific wavelength. Sensor.
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Cited By (1)

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US20150000382A1 (en) * 2013-07-01 2015-01-01 Dr. Frucht Systems Ltd. Method and system for detecting a leak of fluid from a fluid-carrying duct

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JPS63228105A (en) * 1987-03-17 1988-09-22 Fujikura Ltd Sensor for detecting water infiltration of optical fiber
JPH05322690A (en) * 1992-02-21 1993-12-07 Sumitomo Electric Ind Ltd Optical fiber for detecting leaked liquid
JPH08506895A (en) * 1993-02-05 1996-07-23 レイケム・コーポレイション Fiber Optic Water Sensor
JPH08233726A (en) * 1995-02-27 1996-09-13 Fujikura Ltd Optical fiber liquid sensor and swelling member therefor
JP2004045220A (en) * 2002-07-11 2004-02-12 Tc Properties Co Ltd Sensor and method for detecting water

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Publication number Priority date Publication date Assignee Title
JPS63228105A (en) * 1987-03-17 1988-09-22 Fujikura Ltd Sensor for detecting water infiltration of optical fiber
JPH05322690A (en) * 1992-02-21 1993-12-07 Sumitomo Electric Ind Ltd Optical fiber for detecting leaked liquid
JPH08506895A (en) * 1993-02-05 1996-07-23 レイケム・コーポレイション Fiber Optic Water Sensor
JPH08233726A (en) * 1995-02-27 1996-09-13 Fujikura Ltd Optical fiber liquid sensor and swelling member therefor
JP2004045220A (en) * 2002-07-11 2004-02-12 Tc Properties Co Ltd Sensor and method for detecting water

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Publication number Priority date Publication date Assignee Title
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