JPH0435798Y2 - - Google Patents
Info
- Publication number
- JPH0435798Y2 JPH0435798Y2 JP19511883U JP19511883U JPH0435798Y2 JP H0435798 Y2 JPH0435798 Y2 JP H0435798Y2 JP 19511883 U JP19511883 U JP 19511883U JP 19511883 U JP19511883 U JP 19511883U JP H0435798 Y2 JPH0435798 Y2 JP H0435798Y2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- line sensor
- underground
- receiving element
- light receiving
- 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
Links
- 239000013307 optical fiber Substances 0.000 claims description 30
- 230000005856 abnormality Effects 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 5
- 230000004069 differentiation Effects 0.000 claims description 4
- 238000012806 monitoring device Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 208000014674 injury Diseases 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000008733 trauma Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Landscapes
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Description
【考案の詳細な説明】
［考案の背景と目的］
本考案は、地下ケーブル及びその管路、ガス管
及び水道管等の地中埋設物の掘削による外傷、地
盤沈下等による異常の監視をする地中埋設物監視
装置に関するものである。[Detailed explanation of the invention] [Background and purpose of the invention] The invention monitors abnormalities caused by ground subsidence, damage caused by excavation of underground cables and their conduits, gas pipes, water pipes, etc. This relates to an underground object monitoring device.
従来、掘削及び地盤沈下等による地中埋設物の
異常の検知方法は少なく、電力ケーブルにあつて
は損傷による劣化によつて探傷後、絶縁破壊する
迄不明である場合が多く、絶縁破壊による停電の
防止対策を外傷を受けた直後実施することは困難
であつた。またガス管及び水道管等もガス漏れ及
び水漏れが起こつて初めて過去に受けた外傷が原
因であつたことに気付く状況である。また、重要
な埋設物はセンサーを付属して埋設する方法もあ
るが局部的な検出方法であり、ライン状のセンサ
ーではない一方、絶縁電線例えばパイロツトケー
ブルなどをセンサーとして用いた場合は、その切
断によつて初めて外傷を検知する方法であり、そ
の切断に至る前の外傷やパイロツトケーブルの局
部的な異常張力及び横圧等の外力を検知すること
は不可能である。 Conventionally, there are few methods for detecting abnormalities in underground objects due to excavation and ground subsidence, and in the case of power cables, it is often unknown until insulation breaks down after inspection due to deterioration due to damage, and power outages due to insulation breakdown. It has been difficult to implement preventive measures immediately after receiving an injury. In addition, it is only when gas or water leaks occur in gas pipes, water pipes, etc. that it becomes clear that the cause was trauma sustained in the past. In addition, there is a method of burying important buried objects with a sensor attached, but this is a local detection method and is not a linear sensor.However, if an insulated wire such as a pilot cable is used as a sensor, cutting it This is a method that detects trauma for the first time, and it is impossible to detect external forces such as trauma or local abnormal tension or lateral pressure on the pilot cable before it is severed.
更に地中に埋設したパイロツトケーブルによる
検知では、地中迷走電流や地中のケーブルの電磁
誘導により感度が著しく制限されることがある。 Furthermore, the sensitivity of detection using a pilot cable buried underground may be significantly limited by underground stray currents and electromagnetic induction of the underground cable.
又、地中埋設において長手方向の検出する場合
には、センサーの腐食対策が必要となる。 Furthermore, when detecting in the longitudinal direction when buried underground, countermeasures against corrosion of the sensor are required.
本考案の目的は、前記従来技術の欠点を解消
し、地中埋設物の異常を容易に検知し、警報を発
生させる光フアイバを使用したラインセンサーを
含む地中埋設物異常監視装置を提供することにあ
る。 An object of the present invention is to provide an underground object abnormality monitoring device that eliminates the drawbacks of the prior art and includes a line sensor using optical fiber that easily detects abnormalities of underground objects and generates an alarm. There is a particular thing.
［考案の概要］
光フアイバを装えたラインセンサーと、該光フ
アイバの一方端に設けられた発光素子と、該光フ
アイバの他方端に設けられた受光素子と、該受光
素子に接続された時間微分回路と、該時間微分回
路に接続された警報回路とで構成して成るものに
おいて、前記ラインセンサーは螺旋状金属管に前
記光フアイバを添設させ、その外周に柔軟な被覆
層を施した構造としたことを特徴とするものであ
る。[Summary of the invention] A line sensor equipped with an optical fiber, a light emitting element provided at one end of the optical fiber, a light receiving element provided at the other end of the optical fiber, and a time sensor connected to the light receiving element. The line sensor is composed of a differential circuit and an alarm circuit connected to the time differential circuit, and the line sensor has the optical fiber attached to a spiral metal tube, and a flexible coating layer is applied to the outer periphery of the optical fiber. It is characterized by its structure.
［実施例］
以下、本考案を図示した実施例を基に具体的に
説明する。[Example] Hereinafter, the present invention will be specifically described based on an illustrated example.
第１図は、本考案の装置におけるラインセンサ
ー４の一実施例である。螺旋状金属管１には光フ
アイバ２が長手方向に直線状に添設されており、
その外周には柔軟な被覆層３が施されている。螺
旋状金属管１は例えばOFケーブルのAlシースで
もよく、種類になんら制限はない。 FIG. 1 shows an embodiment of the line sensor 4 in the device of the present invention. An optical fiber 2 is linearly attached to the spiral metal tube 1 in the longitudinal direction.
A flexible coating layer 3 is applied to its outer periphery. The spiral metal tube 1 may be, for example, an Al sheath of an OF cable, and there are no restrictions on the type.
被覆管３は、ラインセンサー４の製造時に光フ
アイバ２が変形し伝送損失を生ずることを避ける
程度に施されているものである。ただし、地中に
ラインセンサー４が埋設され、その後横圧等の外
力が発生した場合に、光フアイバ２が容易に変形
しうるためには、被覆層３が柔軟なものであるこ
とが要求される。 The cladding tube 3 is provided to an extent to prevent the optical fiber 2 from being deformed and causing transmission loss during the manufacture of the line sensor 4. However, in order for the optical fiber 2 to be easily deformed when the line sensor 4 is buried underground and external force such as lateral pressure is generated, the coating layer 3 is required to be flexible. Ru.
第２図は、本考案の装置におけるラインセンサ
ー１４の他の実施例を示す説明図で、光フアイバ
１２は螺旋状金属管１１の螺旋と逆ピツチに添設
されており、その外周に柔軟な被覆層１３が施さ
れている。 FIG. 2 is an explanatory diagram showing another embodiment of the line sensor 14 in the device of the present invention, in which the optical fiber 12 is attached to the helical and reverse pitch of the spiral metal tube 11, and a flexible A covering layer 13 is applied.
第３図は本考案による地中埋設物監視装置の実
施例を示す説明図であり、ラインセンサー２４の
光フアイバ２２の一方端に発光素子２６を装え、
他方端に受光素子２７を装え、横圧Ｐ又は張力Ｑ
が発生した場合、光フアイバの伝送損失を受光素
子がとらえ時間微分回路２８により異常を検知す
ると共に警報回路２９により警報を発するもので
ある。 FIG. 3 is an explanatory diagram showing an embodiment of the underground buried object monitoring device according to the present invention, in which a light emitting element 26 is provided at one end of the optical fiber 22 of the line sensor 24,
A light receiving element 27 is installed on the other end, and lateral pressure P or tension Q is
When this occurs, the light receiving element captures the transmission loss of the optical fiber, the time differentiation circuit 28 detects the abnormality, and the alarm circuit 29 issues an alarm.
なお、参考までに光フアイバの一端に光パルス
測定器を設ければ、異常発生地点を知ることがで
きる。 For reference, if an optical pulse measuring device is installed at one end of the optical fiber, the location of the abnormality can be determined.
この検知方法は、光パルス信号が光フアイバ中
を伝わつていく際に光フアイバの中で散乱光が発
生するという現象を利用したものであり、この散
乱光のうち、パルス測定器の方向へ戻つてくる散
乱光の強度変化を時間的に測定することによつ
て、光フアイバの異常発生地点を検知することを
可能としたものである。 This detection method utilizes the phenomenon that scattered light is generated in the optical fiber when the optical pulse signal propagates through the optical fiber. By measuring the intensity change of the incoming scattered light over time, it is possible to detect the point where an abnormality has occurred in the optical fiber.
即ち、光フアイバに外部圧力が加わつていない
状態でパルス信号を発信させると、パルス測定器
へ戻つてくる散乱光は時間と共に滑らかに減衰す
るが、光フアイバに外部圧力が加わると、その部
分において光フアイバの伝送損失量が増大するた
め、パルス測定器へ戻つてくる散乱光の強度変化
は、その散乱光の強度を時系列的に見ると、ある
時間において急激に減衰した波形となる。 In other words, when a pulse signal is transmitted with no external pressure applied to the optical fiber, the scattered light that returns to the pulse measuring instrument decays smoothly over time, but when external pressure is applied to the optical fiber, that part Since the amount of transmission loss in the optical fiber increases, the intensity change of the scattered light returning to the pulse measuring device becomes a waveform that rapidly attenuates at a certain time when the intensity of the scattered light is viewed in time series.
従つて、その急激に変化した時間を読み取るこ
とにより、光フアイバの光損失個所、即ち外部圧
力が加わつた位置を検知することができるのであ
る。 Therefore, by reading the time at which the sudden change occurs, it is possible to detect the location of optical loss in the optical fiber, that is, the location where external pressure is applied.
［考案の効果］
上記に詳しく説明したように、本考案によれば
次のような顕著な効果を奏するものである。[Effects of the Invention] As explained in detail above, the present invention provides the following remarkable effects.
(1) 光フアイバを螺旋管状金属管に添設したこと
により、圧縮等の外力により光フアイバの伝送
損失が容易に発生し、異常が発生したことが容
易に検知できる。(1) By attaching an optical fiber to a spiral metal tube, transmission loss in the optical fiber easily occurs due to external forces such as compression, and the occurrence of an abnormality can be easily detected.
(2) 光フアイバは電気的誘導がないため、地中迷
走電流、電力ケーブル及び雷の影響がない。(2) Optical fiber has no electrical induction, so it is not affected by underground stray currents, power cables, or lightning.
(3) 光フアイバを用いているため地中埋設物とし
て防蝕性がある。(3) Since it uses optical fiber, it is corrosion resistant as an underground object.
第１図及び第２図は、本考案の装置におけるラ
インセンサーの実施例を示す説明図、第３図は本
考案の装置の実施例を示す説明図である。
１，１１……螺旋状金属管、１，１２……光フ
アイバ、３，１３……被覆層、４，１４，２４…
…ラインセンサー、２６……発光素子、２７……
受光素子、２８……時間微分回路、２９……警報
回路。
1 and 2 are explanatory diagrams showing an embodiment of the line sensor in the device of the present invention, and FIG. 3 is an explanatory diagram showing an embodiment of the device of the present invention. 1,11...Spiral metal tube, 1,12...Optical fiber, 3,13...Coating layer, 4,14,24...
...Line sensor, 26...Light emitting element, 27...
Light receiving element, 28... time differentiation circuit, 29... alarm circuit.
Claims (1)
アイバの一方端に設けられた発光素子と、該光フ
アイバの他方端に設けられた受光素子と、該受光
素子に接続された時間微分回路と、該時間微分回
路に接続された警報回路とで構成して成るものに
おいて、前記ラインセンサーは螺旋状金属管に前
記光フアイバを添設させ、その外周に柔軟な被覆
層を施した構造であることを特徴とする地中埋設
物の異常監視装置。 A line sensor equipped with an optical fiber, a light emitting element provided at one end of the optical fiber, a light receiving element provided at the other end of the optical fiber, a time differentiation circuit connected to the light receiving element, and an alarm circuit connected to a time differentiation circuit, wherein the line sensor has a structure in which the optical fiber is attached to a spiral metal tube and a flexible coating layer is applied to the outer periphery of the optical fiber. Features: Abnormality monitoring device for underground objects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19511883U JPS60107804U (en) | 1983-12-19 | 1983-12-19 | Abnormality monitoring device for underground objects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19511883U JPS60107804U (en) | 1983-12-19 | 1983-12-19 | Abnormality monitoring device for underground objects |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60107804U JPS60107804U (en) | 1985-07-22 |
| JPH0435798Y2 true JPH0435798Y2 (en) | 1992-08-25 |
Family
ID=30752615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19511883U Granted JPS60107804U (en) | 1983-12-19 | 1983-12-19 | Abnormality monitoring device for underground objects |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60107804U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005040883A1 (en) * | 2003-10-23 | 2005-05-06 | Prysmian Cavi E Sistemi Energia S.R.L. | Telecommunication optical cable for gas pipeline application having built-in leakage detecting device |
-
1983
- 1983-12-19 JP JP19511883U patent/JPS60107804U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60107804U (en) | 1985-07-22 |
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