JP2006064761A - Multiple-core optical fiber cable for distortion sensor - Google Patents

Multiple-core optical fiber cable for distortion sensor Download PDF

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Publication number
JP2006064761A
JP2006064761A JP2004244013A JP2004244013A JP2006064761A JP 2006064761 A JP2006064761 A JP 2006064761A JP 2004244013 A JP2004244013 A JP 2004244013A JP 2004244013 A JP2004244013 A JP 2004244013A JP 2006064761 A JP2006064761 A JP 2006064761A
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optical fiber
fiber cable
core
strain sensor
length direction
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Hitoshi Kumagai
仁志 熊谷
Keiichi Okada
敬一 岡田
Hideaki Iwaki
英朗 岩城
Shigehiro Endo
重広 遠藤
Takahiro Sato
高宏 佐藤
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Shimizu Construction Co Ltd
Hitachi Cable Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Hitachi Cable Ltd
Shimizu Corp
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Priority to JP2004244013A priority Critical patent/JP2006064761A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To allow accurate measurement of distortion or the like of a structure by means of an optical fiber cable properly supported on the structure by enhancing adhesiveness to the structure by a simple configuration while dealing with the present installation form of laying a plurality of optical fiber cables. <P>SOLUTION: A plurality of coated optical fibers 2 are arranged side by side orthogonally to the longitudinal direction. The jacket 4 provided on each circumference of the coated optical fibers 2 are made continuous between the adjacent jackets. In the continuous part 5 of the adjacent jackets 4, a groove 6 is formed along the longitudinal direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は構造物に埋め込む、または表面に貼り付けて、構造物に係る歪みなどを測定するセンサとなる歪センサ用複芯型光ファイバケーブルに関するものである。   The present invention relates to a multi-core optical fiber cable for a strain sensor, which is a sensor that is embedded in a structure or attached to a surface to measure strain or the like related to the structure.

従来から構造物に生じる歪みを測定する上で光ファイバをセンサとして利用することが行われている。そして歪センサ用光ファイバの強度を向上させるためにＦＲＰ被覆を施したり、埋設したコンクリートとの密着性や耐久性を向上させるために外皮被覆にエンボス加工を行なうことが提案されている（特許文献１、特許文献２）。
また、光ファイバを利用して歪みと温度を同時に測る場合や、断線の対策として現状では一本の光ファイバを外皮材料で被覆してなる光ファイバケーブルを一ヶ所に複数本設置することが行われている。そして、複数の光ファイバをまとめて敷設できるようにする手法としては共通被覆を用いることが提案されている（特許文献３）。
特開２０００−２２７３６８号公報 特開２００２−０２３０３０号公報 特開平０９−１１３０２号公報 Conventionally, an optical fiber has been used as a sensor in measuring strain generated in a structure. In order to improve the strength of the strain sensor optical fiber, it has been proposed to apply FRP coating, or to emboss the outer coating to improve the adhesion and durability with the embedded concrete (Patent Literature). 1, Patent Document 2).
In addition, when measuring strain and temperature simultaneously using an optical fiber, or as a countermeasure against disconnection, it is currently possible to install a plurality of optical fiber cables with one optical fiber covered with a sheath material at one location. It has been broken. And as a technique for enabling a plurality of optical fibers to be laid together, it has been proposed to use a common coating (Patent Document 3).
JP 2000-227368 A JP 2002-023030 A Japanese Patent Laid-Open No. 09-11302

ところで光ファイバケーブルを構造物に敷設する場合、上述した外皮被覆にエンボス加工を施したものであっても断面形状が円となる部分がその長さ方向に亘って大部分を占めることから、構造物と外皮被覆の表面との接着性がそれほど向上するものではなかった。
また、一ヶ所に複数の光ファイバケーブルを敷設すると現状の敷設形態に利用できる上記共通被覆を用いたケーブルではその断面形状が略長円状となっている。しかし、この場合外皮被覆の上面と下面とが幅広の平坦となっており、やはり構造物との接着性を高めることが期待できないものである。
そこで本発明は上記事情に鑑み、複数本の光ファイバケーブルを敷設するという現在の敷設形態に対応しながら、簡易な構成で構造物との接着性を高めることを課題とし、構造物に適正に支持された光ファイバケーブルにて構造物の歪みなどを正確に測定できるようにすることを目的とする。 By the way, when laying an optical fiber cable on a structure, even if the above-mentioned outer sheath is embossed, the portion whose cross-sectional shape is a circle occupies most of the length direction. The adhesion between the object and the surface of the skin coating did not improve so much.
Further, when a plurality of optical fiber cables are laid in one place, the cross-sectional shape of the cable using the above-described common coating that can be used for the current laying configuration is substantially oval. However, in this case, the upper surface and the lower surface of the skin coating are wide and flat, and it cannot be expected to improve the adhesion to the structure.
Therefore, in view of the above circumstances, the present invention has an object to improve the adhesiveness with a structure with a simple configuration while corresponding to the current laying form of laying a plurality of optical fiber cables, and is appropriately applied to the structure. An object of the present invention is to make it possible to accurately measure the distortion of a structure with a supported optical fiber cable.

本発明は上記課題を考慮してなされたもので、光ファイバ芯線を長さ方向に直交する方向に複数並設し、光ファイバ芯線それぞれの周囲に配された外皮被覆が隣り合う同士で連続している歪センサ用複芯型光ファイバケーブルであって、隣り合う外皮被覆同士の連続部に、長さ方向に沿って溝が設けられていることを特徴とする歪センサ用複芯型光ファイバケーブルを提供して、上記課題を解消するものである。
また、本発明において、上記外皮被覆に、長さ方向に直交する方向に沿った溝を形成したエンボス加工が施されているものとすることが良好である。
また、本発明において、上記連続部における溝位置が連続部中心線上であり、溝位置での分離により全周を外皮被覆とする光ファイバケーブルを分岐形成可能にした構成とすることが可能である。 The present invention has been made in consideration of the above problems, and a plurality of optical fiber core wires are juxtaposed in a direction orthogonal to the length direction, and the sheath coatings arranged around each of the optical fiber core wires are continuously adjacent to each other. A strain-coupled optical fiber cable for strain sensors, wherein a groove is provided along a length direction in a continuous portion between adjacent sheath coatings. A cable is provided to solve the above problems.
In the present invention, it is preferable that the skin coating is embossed with grooves along a direction perpendicular to the length direction.
Further, in the present invention, it is possible to adopt a configuration in which the groove position in the continuous portion is on the center line of the continuous portion, and an optical fiber cable having a jacket covering the entire circumference can be formed by separation at the groove position. .

本発明によれば、歪センサ用複芯型光ファイバケーブルの隣り合う外皮被覆同士の連続部に、長さ方向に沿って溝を設けたので、この歪センサ用複芯型光ファイバケーブルの上面や下面が幅方向において凹凸のある形状となり、構造物に対する接着性が向上するようになる。そして、複数本の光ファイバ芯線を有していることから、この一本の歪センサ用複芯型光ファイバケーブルにて一つの測定部位で歪みと温度などの異なる測定項目を同時に測定することができるとともに、一つの測定部位で一つの測定項目を複数の光ファイバ芯線から多重測定でき、測定値に対する信頼性を高めることができる。
また、本発明において、上記外皮被覆に、長さ方向に直交する方向に沿った溝を形成したエンボス加工を施すことで、構造物に対する接着性がさらに向上するようになる。
さらに、本発明において、連続部における溝位置が連続部中心線上であり、溝位置での分離により全周を外皮被覆とする光ファイバケーブルを分岐形成可能にした構成とすることで、分岐した部分も光ファイバケーブルとして外皮被覆を有する適正なケーブル形状となる。 According to the present invention, since the groove is provided along the length direction in the continuous portion of the adjacent outer sheaths of the strain sensor duplex optical fiber cable, the upper surface of the strain sensor duplex optical fiber cable is provided. In addition, the bottom surface and the bottom surface are uneven in the width direction, and the adhesion to the structure is improved. And since it has a plurality of optical fiber core wires, it is possible to simultaneously measure different measurement items such as strain and temperature at one measurement site with this single optical fiber cable for strain sensor. In addition, it is possible to multiplexly measure one measurement item from a plurality of optical fiber core wires at one measurement site, and to improve the reliability of measurement values.
Moreover, in this invention, the adhesiveness with respect to a structure comes to improve further by performing the embossing which formed the groove | channel along the direction orthogonal to a length direction to the said skin coating.
Further, in the present invention, the groove position in the continuous portion is on the center line of the continuous portion, and the optical fiber cable having an outer sheath covering the entire circumference can be branched by separation at the groove position. Also, an appropriate cable shape having an outer sheath as an optical fiber cable is obtained.

つぎに本発明を図１から図６に示す実施の形態に基づいて詳細に説明する。
図中１は歪センサ用複芯型光ファイバケーブルで、該歪センサ用複芯型光ファイバケーブル１は、二本の単芯の光ファイバケーブルａをその長さ方向に直交する方向に並設した形態を有しているものである。光ファイバケーブルａとなっている部分それぞれは、光ファイバ芯線２をＦＲＰ被覆材からなる強度付与被覆３で覆い、さらに強度付与被覆３を合成樹脂材からなる外皮被覆４で覆ったものとなっているが、本発明の歪センサ用複芯型光ファイバケーブル１にあっては、二本の光ファイバ芯線２がそれぞれ強度付与被覆３で覆われた状態で長さ方向に直交する方向に並設されているとともに、隣り合う強度付与被覆３同士が離間した状態（長さ方向での何れの位置でも同間隔にして離間されている）とし、さらに前記強度付与被覆３の全周を覆っている外皮被覆４が隣り合う部分で、この隣り合う外皮被覆４が一体となって連続部５が設けられており、前記連続部５を介して隣り合う前記外皮被覆４が連続しているものである。 Next, the present invention will be described in detail based on the embodiment shown in FIGS.
In the figure, reference numeral 1 denotes a strain sensor multi-core optical fiber cable. The strain sensor multi-core optical fiber cable 1 has two single-core optical fiber cables a arranged in parallel in a direction perpendicular to the length direction thereof. It has the form which did. Each of the portions constituting the optical fiber cable a is formed by covering the optical fiber core wire 2 with a strength-imparting coating 3 made of an FRP coating material, and further covering the strength-imparting coating 3 with an outer sheath coating 4 made of a synthetic resin material. However, in the multi-core optical fiber cable 1 for strain sensor according to the present invention, the two optical fiber core wires 2 are arranged in parallel in a direction perpendicular to the length direction in a state where each of the optical fiber core wires 2 is covered with the strength-imparting coating 3. In addition, the adjacent strength-imparting coatings 3 are separated from each other (they are spaced at the same interval at any position in the length direction), and further cover the entire circumference of the strength-imparting coating 3. In the portion where the skin coating 4 is adjacent, the adjacent skin coating 4 is integrally provided with a continuous portion 5, and the adjacent skin coating 4 is continuous via the continuous portion 5. .

そして、歪センサ用複芯型光ファイバケーブル１の長さ方向に直交した方向での断面形状において、図３に示すように上記連続部５の上面と下面とに溝６が設けられており、この溝６それぞれは歪センサ用複芯型光ファイバケーブル１の長さ方向に亘って連続しているものである。
このように歪センサ用複芯型光ファイバケーブル１では外皮被覆４の連続部５の上下に溝６が設けられているので、歪センサ用複芯型光ファイバケーブル１の上面と下面が幅方向において凹凸のある形状となり、この歪センサ用複芯型光ファイバケーブル１を構造物に埋設、または接着した場合にその構造物との接着性が向上し、歪センサ用複芯型光ファイバケーブル１が適正に支持されるものとなる。 And in the cross-sectional shape in the direction orthogonal to the length direction of the multi-core type optical fiber cable 1 for strain sensors, the groove | channel 6 is provided in the upper surface and lower surface of the said continuous part 5, as shown in FIG. Each of the grooves 6 is continuous over the length direction of the strain sensor multi-core optical fiber cable 1.
As described above, in the strain sensor duplex optical fiber cable 1, the grooves 6 are provided above and below the continuous portion 5 of the outer sheath 4, so that the upper and lower surfaces of the strain sensor duplex optical fiber cable 1 are in the width direction. When the multi-core optical fiber cable 1 for strain sensor is embedded or bonded to a structure, the adhesion with the structure is improved, and the multi-core optical fiber cable 1 for strain sensor is improved. Will be properly supported.

さらに個々の上記光ファイバケーブルａとして構成されている部分の外皮被覆４それぞれにあっては、上面と下面とで異なる位置にして、かつ長さ方向に直交する方向に沿った溝７にしてエンボス加工８が施されている。このエンボス加工８は長さ方向に定間隔にして設けられているものであり、このエンボス加工が施されているために、構造物との接着性がさらに向上するものとなっている。   Further, in each of the sheath coatings 4 of the portions configured as the individual optical fiber cables a, embossing is performed by making the grooves 7 along the direction orthogonal to the length direction at different positions on the upper surface and the lower surface. Processing 8 is performed. The embossing 8 is provided at regular intervals in the length direction, and since this embossing is performed, the adhesion to the structure is further improved.

上記連続部５において上下の溝６がケーブル厚さ方向に相対してなる溝間位置９は、その溝間位置９でのケーブル厚さ方向での厚み寸法ｂが、連続部５における強度付与被覆３側近傍位置でのケーブル厚さ方向での厚み寸法ｃより小さく、連続部５で最小となっており、例えばこの歪センサ用複芯型光ファイバケーブル１の末端側から溝間位置９で裂くことが容易であり、光ファイバケーブルａを構成している部分を単独に分岐することができる。そして、溝間位置９は隣り合う強度付与被覆３の中間位置にして連続部５の中心線上であり、個々の強度付与被覆３を表出させることなく外皮被覆４で覆った光ファイバケーブルａが分岐形成されるように構成されているものである。そのため、歪センサ用複芯型光ファイバケーブル１の末端側の光ファイバ芯線を測定機器の接続端子に接続し易くなるとともに、末端側でばらした光ファイバケーブルａそれぞれを、測定機器の接続端子位置まで外皮被覆４を備える適正なケーブル形状とすることができる。あるいは末端の光ファイバ同士を接続し、ループ状の配線とすることもできる。   The inter-groove position 9 in which the upper and lower grooves 6 are opposed to each other in the cable thickness direction in the continuous portion 5 has a thickness dimension b in the cable thickness direction at the inter-groove position 9 so that the strength-imparting coating in the continuous portion 5 is obtained. It is smaller than the thickness dimension c in the cable thickness direction at the position near the 3 side, and is minimum at the continuous portion 5. For example, the multi-core optical fiber cable 1 for strain sensors is torn at the groove position 9 from the end side. It is easy and the part which comprises the optical fiber cable a can be branched independently. The inter-groove position 9 is an intermediate position between the adjacent strength-imparting coatings 3 on the center line of the continuous portion 5, and the optical fiber cable a covered with the outer sheath coating 4 without exposing the individual strength-imparting coatings 3. It is configured to be branched. Therefore, it becomes easy to connect the optical fiber core wire on the terminal side of the multi-core optical fiber cable 1 for strain sensor to the connection terminal of the measuring device, and each of the optical fiber cables a separated on the terminal side is connected to the position of the connecting terminal of the measuring device. It can be set as an appropriate cable shape provided with the outer sheath 4. Alternatively, terminal optical fibers can be connected to form a loop-shaped wiring.

上記実施の例では、外皮被覆４の外周形状が丸みを有するものとしたが、本発明はこれに限定されるものではない。例えば図５に示されているように、光ファイバケーブルａそれぞれを構成している部分での外皮被覆４の外周形状が角張ったものとすることも可能である。
さらに、実施の例での歪センサ用複芯型光ファイバケーブル１は光ファイバ芯線を二本としたが、本発明はこの例に限定されるものではなく、例えば図６に示すように三本の光ファイバケーブルａが並設された形態となるように光ファイバ芯線２を三本としてもよい。 In the above embodiment, the outer peripheral shape of the skin coating 4 is rounded, but the present invention is not limited to this. For example, as shown in FIG. 5, it is possible to make the outer peripheral shape of the outer sheath 4 in a portion constituting each optical fiber cable a square.
Furthermore, the strain sensor multi-core optical fiber cable 1 in the embodiment has two optical fiber core wires, but the present invention is not limited to this example. For example, as shown in FIG. It is good also as three optical fiber core wires 2 so that it may become the form where the said optical fiber cable a was arranged in parallel.

本発明に係る歪センサ用複芯型光ファイバケーブルの一例を示す説明図である。It is explanatory drawing which shows an example of the multi-core type optical fiber cable for strain sensors which concerns on this invention. 一例の上面側を示す説明図である。It is explanatory drawing which shows the upper surface side of an example. 一例を断面にて示す説明図である。It is explanatory drawing which shows an example in a cross section. 分岐した状態を示す説明図である。It is explanatory drawing which shows the state branched. 二芯の他の例を断面で示す説明図である。It is explanatory drawing which shows the other example of a 2 core in a cross section. 三芯の例を断面で示す説明図である。It is explanatory drawing which shows the example of a three core in a cross section.

符号の説明Explanation of symbols

１…歪センサ用複芯型光ファイバケーブル
２…光ファイバ芯線
３…強度付与被覆
４…外皮被覆
５…連続部
６…溝
７…溝
８…エンボス加工
９…溝間位置
ａ…光ファイバケーブル
ｂ…連続部における溝間位置の厚み寸法
ｃ…連続部における強度付与被覆側近傍での厚み寸法 DESCRIPTION OF SYMBOLS 1 ... Multi-core type optical fiber cable for strain sensors 2 ... Optical fiber core wire 3 ... Strength imparting coating 4 ... Outer coating 5 ... Continuous part 6 ... Groove 7 ... Groove 8 ... Embossing 9 ... Inter-groove position a ... Optical fiber cable b ... Thickness dimension at the position between the grooves in the continuous part c ... Thickness dimension in the vicinity of the strength imparting coating side in the continuous part

Claims (3)

光ファイバ芯線を長さ方向に直交する方向に複数並設し、光ファイバ芯線それぞれの周囲に配された外皮被覆が隣り合う同士で連続している歪センサ用複芯型光ファイバケーブルであって、隣り合う外皮被覆同士の連続部に、長さ方向に沿って溝が設けられていることを特徴とする歪センサ用複芯型光ファイバケーブル。   A multi-core optical fiber cable for a strain sensor in which a plurality of optical fiber core wires are arranged in parallel in a direction perpendicular to the length direction, and the outer sheaths arranged around each of the optical fiber core wires are adjacent to each other. A strain sensor multi-core optical fiber cable, wherein a groove is provided along a length direction in a continuous portion between adjacent sheath coatings. 上記外皮被覆に、長さ方向に直交する方向に沿った溝を形成したエンボス加工が施されている請求項１に記載の歪センサ用複芯型光ファイバケーブル。   The multi-core optical fiber cable for a strain sensor according to claim 1, wherein the outer sheath is embossed with a groove formed in a direction perpendicular to the length direction. 上記連続部における溝位置が連続部中心線上であり、溝位置での分離により全周を外皮被覆とする光ファイバケーブルを分岐形成可能にした構成である請求項１又は２に記載の歪センサ用複芯型光ファイバケーブル。   The strain sensor according to claim 1 or 2, wherein the groove position in the continuous part is on the center line of the continuous part, and an optical fiber cable having a sheath covering the entire circumference can be branched by separation at the groove position. Multi-core optical fiber cable.
JP2004244013A 2004-08-24 2004-08-24 Multiple-core optical fiber cable for distortion sensor Pending JP2006064761A (en)

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CN103868467A (en) * 2014-03-31 2014-06-18 宁波良和路桥科技有限公司 Optical fiber strain sensor eliminating temperature influences

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CN103868467A (en) * 2014-03-31 2014-06-18 宁波良和路桥科技有限公司 Optical fiber strain sensor eliminating temperature influences

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