JPH02216030A - Water infiltration detection sensor for optical fiber - Google Patents
Water infiltration detection sensor for optical fiberInfo
- Publication number
- JPH02216030A JPH02216030A JP1036738A JP3673889A JPH02216030A JP H02216030 A JPH02216030 A JP H02216030A JP 1036738 A JP1036738 A JP 1036738A JP 3673889 A JP3673889 A JP 3673889A JP H02216030 A JPH02216030 A JP H02216030A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- water
- cover
- detection sensor
- gap
- 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 230000008595 infiltration Effects 0.000 title abstract 4
- 238000001764 infiltration Methods 0.000 title abstract 4
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 238000007654 immersion Methods 0.000 claims description 21
- 239000011253 protective coating Substances 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000001035 drying Methods 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 abstract description 4
- 229920000642 polymer Polymers 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 3
- 230000008961 swelling Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 101100298295 Drosophila melanogaster flfl gene Proteins 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野ン
本発明は、例えば電気通信ケーブルなどの内部に配設さ
れて、同ケーブルの浸水事故を正確に迅速に検知するの
に使用される光ファイバ浸水検知センサに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an optical fiber disposed inside a telecommunications cable, etc., and used to accurately and quickly detect flooding accidents in the cable. This invention relates to a water immersion detection sensor.
（従来の技術）
従来の光ファイバ浸水検知センサは、第８図、第９図ａ
のように光ファイバＡの全外周に、吸水性樹脂Ｂからな
る保護被覆Ｃが密着状態で被覆されている。このセンサ
は、例えばケーブルの全長に面って使用され、同ケーブ
ルのケーブル接続部に浸水があると、第９図ａの保護被
覆Ｃが吸水して第１０図ａのように膨張し、その膨張力
が前記光ファイバＡに側圧となって加わり、前記浸水位
置しにおける光ファイバへの伝達損失（マイクロベンド
ロス）が増加する。このときの後方散乱光を第７図のよ
うにＯＴ Ｄ Ｒ（Ｏｐｔｉｃａｌ Ｔｉｍｅ Ｄｏｍ
ａｉｎＲｅｆｌｅｃｔｍｅｔｅｒ）などにより第９図ｂ
、第１Ｏ図すのように検出すれば、同後方散乱光強度の
変化から浸水の有無を、またその応答時間から前記浸水
位置りを算出することができるように構成されている。(Prior art) A conventional optical fiber water immersion detection sensor is shown in Fig. 8 and Fig. 9a.
The entire outer periphery of the optical fiber A is covered with a protective coating C made of a water-absorbing resin B in close contact with the optical fiber A. This sensor is used, for example, along the entire length of a cable, and when water enters the cable connection part of the cable, the protective coating C shown in Figure 9a absorbs water and expands as shown in Figure 10a. The expansion force is applied to the optical fiber A as a lateral pressure, and the transmission loss (microbend loss) to the optical fiber at the submerged position increases. The backscattered light at this time is converted into an OTDR (Optical Time Dom) as shown in Figure 7.
ainReflectmeter) etc. in Figure 9b.
, if detected as shown in Figure 1O, the presence or absence of water intrusion can be calculated from the change in the backscattered light intensity, and the location of the water intrusion can be calculated from the response time.
ちなみに萌記吸水性材料の吸水による体積膨張率は、数
百倍にも及ぶ。By the way, the volumetric expansion rate of Moeki's water-absorbent material due to water absorption is several hundred times higher.
（発明が解決しようとする課題）
従来の光ファイバ浸水検知センサは以下のような問題が
あった。(Problems to be Solved by the Invention) Conventional optical fiber water immersion detection sensors have the following problems.
■ 従来は前記のようにして検出された浸水箇所を修理
した後、前記保護被覆Ｃをドライヤーなどにより乾燥さ
せてｉ７＋記光ファイバ浸水検知センサを再使用してい
るが、−旦、膨潤した同被１ｃは容易には元の形状に復
元しにくいため、定常の伝送特性に戻りにくいという問
題があり、最悪の場合には同センザを交換しなければな
らないといった面倒があった。■ Conventionally, the i7+ optical fiber water intrusion detection sensor was reused by repairing the water intrusion detection sensor detected in the above manner and then drying the protective coating C with a hair dryer. Since the sensor 1c is difficult to restore to its original shape, there is a problem in that it is difficult to return to a steady transmission characteristic, and in the worst case, the sensor must be replaced.
■０通常の工場内の製造環境内において、大気中の水分
により、被覆Ｃが膨潤し、伝ｊメＪｆ１失１ｔが増加し
てしまうため、製造後、乾燥室等の特別な環境下で保管
しなければならないという問題があった。■0 In a normal manufacturing environment in a factory, the coating C swells due to moisture in the atmosphere, increasing the amount of transmission Jf1 lost 1t, so after manufacturing, store it in a special environment such as a drying room. There was a problem that I had to do it.
■、光ファイバ浸水検出センザに外力が加わって、例え
ば第１Ｉ図ａに示すように同センザの光ファイバＡが極
度に変形しても、同図すのようなマイクロベンドロスが
検出されるため、このロスが浸水の発生に起因するもの
か、或は外力の付加に起因するものかなのが’ｌ：ｌｌ
別できにくいといった問題があった。■ Even if an external force is applied to the optical fiber immersion detection sensor and the optical fiber A of the sensor is extremely deformed, for example as shown in Figure 1I, microbend loss as shown in Figure 1A will be detected. It is unclear whether this loss is due to flooding or due to external force.
The problem was that it was difficult to tell them apart.
（発明の目的）
本発明の目的は、浸水により膨潤した保護被覆の乾燥に
よる原状復帰が容易で、外力によって光ファイバが伝送
１ｎ失量の増加を起こしにくく、史に、通常の製造環境
下での製造を可能とする浸水位置の正確な検出が可能で
ある光ファイバ浸水検出センサを提供することにある。(Objective of the Invention) The object of the present invention is that the protective coating swollen due to water immersion can be easily restored to its original state by drying, and that optical fibers are less prone to increase in transmission 1n loss due to external force, and that An object of the present invention is to provide an optical fiber water immersion detection sensor that can accurately detect the location of water immersion.
（問題点を解決するためのＦ段）
本発明の光ファイバ浸水検出センサは、第１図のように
少なくとも一本の光ファイバＡの外周に、吸水性樹脂Ｂ
からなる保護被覆１が、同外周との間に間隙２を設けて
被覆されていることを特徴とするものである。(Step F for solving the problem) The optical fiber water immersion detection sensor of the present invention has water-absorbing resin B on the outer periphery of at least one optical fiber A, as shown in FIG.
The protective coating 1 is characterized in that it is coated with a gap 2 between it and the outer periphery of the protective coating 1.
（作用）
本発明の光ファイバ浸水検知センサでは、第２図ａ、第
３図ａに示すように従来と同様に、浸水により保護被覆
１が淵潤すると、同被覆１が膨張して光ファイバＡに密
着し、その膨張力により光ファイバ△に側圧が加わり、
同ファイバ△のマイクロベンドロスが増加するため、第
７図のように後方散乱光の強度変イヒを検出すれば浸水
があったことを検知できろと共に、その浸水位置りをも
算出することができる。(Function) In the optical fiber water immersion detection sensor of the present invention, as shown in FIGS. 2a and 3a, when the protective coating 1 becomes wet due to water immersion, the coating 1 expands and the optical fiber It comes into close contact with A, and its expansion force applies lateral pressure to the optical fiber △.
Since the microbend loss of the same fiber △ increases, it is possible to detect the presence of water intrusion by detecting the change in the intensity of the backscattered light as shown in Figure 7, and also calculate the location of the inundation. can.
ノｊ、ＪＪｆｉ常の製造環境（例えば湿度３０℃、相対
湿度８０％）での保１潮被ｉ夏Ｉの最大膨ボｌ；Ｈｉｐ
の１／２がチューブ内のクリアランスにの１／２よりも
小さくなるように設計すれば、通常の製造環境下での、
伝送Ｉ１１失の増加を防１トてきる。Noj, JJfi Maximum swelling volume in normal manufacturing environment (e.g. humidity 30℃, relative humidity 80%); Hip
If the design is made so that 1/2 of is smaller than 1/2 of the clearance within the tube, under normal manufacturing environment,
This can prevent an increase in transmission I11 losses.
前記浸水位置の修理が終了したならば、従来と同様に前
記保護被覆ｌをドライヤなどにより乾燥させて同被覆を
原状に復元させる。この場合、元来、同被覆１は光ファ
イバへの外周に間隙２を設Ｇづて被覆されているので、
同被覆１と光ファイバＡとの間に間隙２ができる程度に
同波ｆｉｌを乾燥さぜれば良い。Once the repair of the flooded location is completed, the protective coating l is dried using a dryer or the like in the same manner as in the past to restore it to its original state. In this case, since the coating 1 is originally coated with a gap 2 around the outer periphery of the optical fiber,
The optical fiber A may be dried to such an extent that a gap 2 is formed between the optical fiber A and the optical fiber coating 1.
また前記光ファイバ浸水検知セン勺に機械的外力が加わ
った場合は、同外力により保護被ｔＵ Ｉが変形しても
間隙２により吸収されるため、同外力が同被覆１を介し
て光ファイバＡに加わりにくくなり、同光ファイバＡの
伝送損失増加用は皆無か或は増加しても非常に小さいも
のとなるので、マイクロベンドロスも殆ど無い。このた
め浸水によるマイクロベンドロスと機械的外力によるマ
イクロベンドロスとが明確に区別される。In addition, when a mechanical external force is applied to the optical fiber immersion detection sensor, even if the protective cover tUI is deformed by the external force, it is absorbed by the gap 2, so that the external force is applied to the optical fiber A through the coating 1. Since the increase in transmission loss of the optical fiber A is either nil or very small even if it increases, there is almost no microbend loss. Therefore, microbend loss due to water immersion and microbend loss due to external mechanical force are clearly distinguished.
（実施例）
第１図は本発明の光ファイバ浸水検知センサの一実施例
である。(Example) FIG. 1 shows an example of the optical fiber water immersion detection sensor of the present invention.
同図に示す１は保護被覆であり、これは光ファイバＡの
外周に間隙２を設けて、遊嵌状態で被覆しである。この
保護被ｆＩｆｌはプラスチックに吸水性高分子パウダー
を分散させて得られる吸水性樹脂Ｂによって形成されて
いる。Reference numeral 1 shown in the figure is a protective coating, which is loosely fitted with a gap 2 provided around the outer periphery of the optical fiber A. The protected flfl is made of water-absorbing resin B obtained by dispersing water-absorbing polymer powder in plastic.
前記間隙２には適宜コンパウンドを充填するのが望まし
いが、場合によっては空隙のままにしておいても良い。It is desirable to fill the gap 2 with a compound as appropriate, but depending on the case, it may be left as a gap.
この実施例では、ＣＣ，ＩＴＴ勧告Ｇ−６５２に基づい
た標準シングルモードファイバの外周に、ＵＶ被覆が施
された被覆外径２５０μｍの光ファイバＡを使用し、シ
ンコフォックス２８０（商品名）を前記コンパウンドと
して使用し、ポリエチレンに吸水性高分子パウダーを分
散させて得られる吸水性樹脂（プラウエツトＧ１４０：
商品名）を外径］、Ｏｍｍ、内径０．５６ｍｍのデユー
プ状に形成して保護被覆ｌとして使用した。尚、このプ
ラウエツトＧ１４０を使用することにより、通常の押出
機により容易に押出被覆ができた。In this example, an optical fiber A with an outer diameter of 250 μm and a UV coating on the outer periphery of a standard single mode fiber based on CC, ITT Recommendation G-652 is used. A water-absorbing resin (Purawet G140: used as a compound and obtained by dispersing water-absorbing polymer powder in polyethylene)
(trade name) was formed into a dupe shape with an outer diameter of 0.0 mm and an inner diameter of 0.56 mm, and was used as a protective coating 1. Incidentally, by using this Prawet G140, extrusion coating could be easily performed using a normal extruder.
この光ファイバ浸水検知センサを第５図のダブル１０内
に実装して、］４５０ｍの長さのケブル１０を製造し、
このケーブル１０の２００ｍ位置−Ｚ、８２０ｍ位置
Ｙ、及び１．３５０ｍ位置・Ｗの三箇所において、実際
に同ケーブル１０に浸水させて、第７図のシステムで後
方散乱光強度を測定したところ、第６図ａの定常状態か
ら同図すのように明確に変化した。This optical fiber water immersion detection sensor is mounted inside the double 10 shown in FIG. 5 to manufacture a cable 10 with a length of 450 m,
200m position - Z, 820m position of this cable 10
When the cable 10 was actually immersed in water at three locations, Y, and 1.350m position W, the backscattered light intensity was measured using the system shown in Figure 7. There was a clear change as in
以」二のように本発明の光ファイバ浸水検知センサは、
従来のものと全く変わらない浸水検出能力を有する。As described below, the optical fiber water immersion detection sensor of the present invention has the following features:
It has the same water immersion detection ability as conventional ones.
なお第５図のケーブル１０において、１１はプラスチッ
ク製アウターシース、１２は吸湿性ラッピングテープ、
１３は溝付芯材、１４はファイバノボン、１５はＦＲＰ
裂抗張力体である。In the cable 10 shown in FIG. 5, 11 is a plastic outer sheath, 12 is a hygroscopic wrapping tape,
13 is a grooved core material, 14 is a fiber tube, 15 is FRP
It is a tear tensile strength body.
（発明の効果）
本発明の光ファイバ浸水検知センサは、光ファイバＡの
外周に保護被覆１が間隙２を設＆−ｊて被覆されている
ので、以下のような効果がある。(Effects of the Invention) The optical fiber water immersion detection sensor of the present invention has the protective coating 1 provided around the outer periphery of the optical fiber A with a gap 2, and therefore has the following effects.
■、浸水位置の修理が終了してから前記保護被覆Ｉをド
ライヤなどにより乾燥させる際に、同波ｉｌが完全に復
元せずとも、同波Ｍｌと光ファイバＡとの間に間隙２が
できる程度に乾燥させれば同光ファイバへの残存側圧が
開放されるため、再使用可能となり、乾燥作業も容易に
なる。(2) When drying the protective coating I using a dryer or the like after repairing the flooded position, a gap 2 is created between the same wave Ml and the optical fiber A even if the same wave IL is not completely restored. If the optical fiber is dried to a certain extent, the residual lateral pressure on the optical fiber will be released, making it possible to reuse it and making the drying process easier.
■ 通常の製造環境下での膨潤に対しては、伝送損失の
増加を生しることなく製造が可能である。■ Can be manufactured without increasing transmission loss due to swelling under normal manufacturing environment.
■、前記光ファイバ浸水検知センサに外力が加わっても
、同外力による保護被ｆｉｌの変形が間隙２により吸収
されるので、同外力による光ファイバＡの伝送損失増加
量は皆無か或は増加しても非常に小さく、マイクロベン
ドロスが殆ど無いため、伝送損失が外力によるものか或
は浸水によるものか判別でき、浸水だけを正確に検出す
ることができる。(2) Even if an external force is applied to the optical fiber immersion detection sensor, the deformation of the protected film due to the external force is absorbed by the gap 2, so the increase in transmission loss of the optical fiber A due to the external force is either nil or increases. Since the transmission loss is very small and there is almost no microbend loss, it is possible to determine whether the transmission loss is due to external force or water intrusion, and only water intrusion can be accurately detected.
第１図は本発明の光ファイバ浸水検知センサの実施例の
断面図、第２図ａ、第３図Ｆｌ、第４図は同センサの説
明図、第２図ｂ、第３図すは同センサの伝送損失の説明
図、第５図は同センサのケブル内実装状態の断面図、第
６図ａ、１つは第５図のセンサの伝送損失の説明図、第
７図は浸水位置検出機構の構成図、第８図は従来の光フ
ァイバ浸水検知センサの断面図、第９図ａ、第１０図ａ
、第１１図ａは同センサの説明図、第９図ｂ、第１０図
ｂ、第１１図すは同センサの伝送損失の説明図である。
ｌは保護被覆
２は間隙FIG. 1 is a sectional view of an embodiment of the optical fiber water immersion detection sensor of the present invention, FIGS. 2a, 3F, and 4 are explanatory diagrams of the same sensor, and An explanatory diagram of the transmission loss of the sensor. Figure 5 is a cross-sectional view of the sensor mounted inside the cable. Figure 6a is an explanatory diagram of the transmission loss of the sensor in Figure 5. Figure 7 is a diagram showing the detection of the submerged position. The configuration diagram of the mechanism, Figure 8 is a sectional view of a conventional optical fiber water immersion detection sensor, Figure 9a, Figure 10a
, FIG. 11a is an explanatory diagram of the same sensor, FIG. 9b, FIG. 10b, and FIG. 11 are explanatory diagrams of transmission loss of the same sensor. l is the protective coating 2 is the gap
Claims (1)
からなる保護被覆１が、同外周との間に間隙２を設けて
被覆されていることを特徴とする光ファイバ浸水検知セ
ンサ。At least one optical fiber A has a water-absorbing resin B on its outer periphery.
An optical fiber water immersion detection sensor characterized in that a protective coating 1 consisting of a protective coating 1 is coated with a gap 2 provided between the protective coating 1 and the outer periphery of the protective coating 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1036738A JP2766497B2 (en) | 1989-02-16 | 1989-02-16 | Optical fiber immersion detection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1036738A JP2766497B2 (en) | 1989-02-16 | 1989-02-16 | Optical fiber immersion detection sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02216030A true JPH02216030A (en) | 1990-08-28 |
| JP2766497B2 JP2766497B2 (en) | 1998-06-18 |
Family
ID=12478074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1036738A Expired - Lifetime JP2766497B2 (en) | 1989-02-16 | 1989-02-16 | Optical fiber immersion detection sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2766497B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120033205A1 (en) * | 2010-08-06 | 2012-02-09 | Fujikura Ltd. | Sensor head and optical sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5443752A (en) * | 1977-09-13 | 1979-04-06 | Sumitomo Electric Ind Ltd | Optical cabel and inundation monitoring method using the same |
| JPS62262803A (en) * | 1986-05-09 | 1987-11-14 | Fujikura Ltd | Optical fiber inundation detecting sensor |
| JPS63228105A (en) * | 1987-03-17 | 1988-09-22 | Fujikura Ltd | Sensor for detecting water infiltration of optical fiber |
-
1989
- 1989-02-16 JP JP1036738A patent/JP2766497B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5443752A (en) * | 1977-09-13 | 1979-04-06 | Sumitomo Electric Ind Ltd | Optical cabel and inundation monitoring method using the same |
| JPS62262803A (en) * | 1986-05-09 | 1987-11-14 | Fujikura Ltd | Optical fiber inundation detecting sensor |
| JPS63228105A (en) * | 1987-03-17 | 1988-09-22 | Fujikura Ltd | Sensor for detecting water infiltration of optical fiber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120033205A1 (en) * | 2010-08-06 | 2012-02-09 | Fujikura Ltd. | Sensor head and optical sensor |
| US8934739B2 (en) * | 2010-08-06 | 2015-01-13 | Fujikura Ltd. | Sensor head and optical sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2766497B2 (en) | 1998-06-18 |
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