JPS59102A - Radiation-proof optical transmission line - Google Patents
Radiation-proof optical transmission lineInfo
- Publication number
- JPS59102A JPS59102A JP57110173A JP11017382A JPS59102A JP S59102 A JPS59102 A JP S59102A JP 57110173 A JP57110173 A JP 57110173A JP 11017382 A JP11017382 A JP 11017382A JP S59102 A JPS59102 A JP S59102A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- radiation
- monitoring
- heating device
- transmission line
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 26
- 230000003287 optical effect Effects 0.000 title claims abstract description 16
- 239000013307 optical fiber Substances 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- 230000005855 radiation Effects 0.000 claims abstract description 14
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims 2
- 239000013305 flexible fiber Substances 0.000 claims 1
- 206010073306 Exposure to radiation Diseases 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は耐放射線光（伝送路に関するものである。[Detailed description of the invention] The present invention relates to radiation-resistant optical transmission lines.
放射線が存在する環境下で光コアイノ・を用いると、被
曝により光ファイバの伝送損失が増大することが知られ
ている。It is known that when an optical core is used in an environment where radiation is present, the transmission loss of the optical fiber increases due to exposure.
そのだめ、放射線被曝による損失増加の小さい光ファイ
バの研究開発が進められており、効果を上げているが、
なお満足すべき値は得られていない。As a result, research and development of optical fibers with less increase in loss due to radiation exposure is underway, and is proving effective.
However, a satisfactory value has not been obtained.
一方、このような放射線破曝光ファイバの性質として熱
アニール効果がある。On the other hand, as a property of such a radiation-broken optical fiber, there is a thermal annealing effect.
これは、被曝して着色した）ｊラスを加熱することによ
り退色できるというものであり、４５０ ’ｃ〜５００
°Ｃで１時間加熱することにより、はぼ初期値まで回復
しうるという報告もある。This means that the color can be faded by heating the (colored) glass that has been colored by exposure to radiation, and the color can be faded by heating it.
There is also a report that the temperature can be restored to the initial value by heating at °C for 1 hour.
そこで光ファイバを常時あるいは周期的に加熱すること
により透明度を維持するということも一応考えられるが
、このような高温度に光フーアイハを長時間あるいは多
数回晒すと、光ファイバは急速に劣化して実用不能とな
ってしまう。Therefore, it may be possible to maintain the transparency by constantly or periodically heating the optical fiber, but if the optical fiber is exposed to such high temperatures for a long time or many times, the optical fiber will deteriorate rapidly. It becomes impractical.
本発明は期かる状況に鑑み、光ファイバをあまり劣化さ
せることなく、放射線被曝後も伝送機能を維持すること
のできる耐放射線光伝送路を提供することを目的とする
。SUMMARY OF THE INVENTION In view of these circumstances, it is an object of the present invention to provide a radiation-resistant optical transmission line that can maintain its transmission function even after exposure to radiation without significantly degrading the optical fiber.
本発明の構成を、一実施例を示す図面を参照して具体的
に説明する。The configuration of the present invention will be specifically explained with reference to the drawings showing one embodiment.
第１図において、１は伝送路用光ファイバであり、放射
線被曝時の損失増加量が極力小さい特性の光フーｒイノ
・が採用される。In FIG. 1, reference numeral 1 denotes an optical fiber for a transmission line, and an optical fiber having a characteristic of minimizing loss increase upon exposure to radiation is employed.
２はモニタ用光ファイバであり、光ファイバ１に比較し
て放射線被曝時の損失増加量の大きい光ファイバが採用
される。Reference numeral 2 denotes a monitoring optical fiber, and compared to optical fiber 1, an optical fiber having a larger increase in loss upon exposure to radiation is employed.
６は発光装置、であ°す、４は受光装置である。6 is a light emitting device, and 4 is a light receiving device.
このような尤ファイバ１，２の全長もしくは放射線被曝
部分５に伝送用光ファイ・・１のみもしくは回送用光フ
ァイバ１とモニタ出光コアイノ・２の双方を加熱するだ
めの装置６が設けられている。７は加熱端イである。A device 6 for heating only the transmission optical fiber 1 or both the forwarding optical fiber 1 and the monitor light output core 2 is provided on the entire length of such optical fibers 1 and 2 or on the radiation-exposed portion 5. . 7 is the heating end A.
モニタ用光ファイバ２の出力は光パワーメータ８によっ
てモニタされ−こおり、放射線被曝によって１尺送損失
が増加し、光パワーメータ８の受光量が作動させ、少々
くとも伝送用光ファイバ１を一定時間だけ加熱する。The output of the monitor optical fiber 2 is monitored by the optical power meter 8, and the transmission loss increases by 1 meter due to radiation exposure, and the amount of light received by the optical power meter 8 is activated, keeping the transmission optical fiber 1 at least a little constant. Heat only for an hour.
加熱装置６の作動のタイミングは本伝送路の目的、用途
により異なるが、例えば次のモニタ用光ファイバが適し
ている。Although the timing of activation of the heating device 6 varies depending on the purpose and use of the transmission line, for example, the following monitoring optical fiber is suitable.
第２図はモニタ出光ファイ・・・の種類による被曝総線
昂と伝送損失との関係を示す。Figure 2 shows the relationship between the total radiation exposure and transmission loss depending on the type of monitor output fiber.
放射線に対して非常に敏感に反応して加熱装置を働かせ
たい場合には、コアがＯＨ基１ ｐｐｍ以下の高純度石
英ガラスである光ファイ・・（ａ）を用いれはよい。こ
の場合、被曝が停止するとモニタ用光ファイバの損失は
急激に回１夏する。If it is desired to operate a heating device that reacts very sensitively to radiation, an optical fiber (a) whose core is made of high-purity quartz glass with 1 ppm or less of OH groups may be used. In this case, when the exposure stops, the loss in the monitoring optical fiber increases rapidly.
寸だ、放射線に対する反応を鈍く設定し、頻繁に加熱装
置を働かせたくない場合や、放射線によるモニタ用光フ
ァイバの伝送損失が大きくなり過ぎては困る場合などは
、コアがＯＨ基をＥ３００ ｐｐｍ以上含む石英ガラス
である光ファイバ（Ｃ）を用いればよい。However, if you want to set the reaction to radiation to be slow and do not want to use the heating device frequently, or if you do not want the transmission loss of the monitoring optical fiber to become too large due to radiation, set the core to have an OH group of E300 ppm or more. An optical fiber (C) that is made of quartz glass may be used.
これらの中間で標準的動作を期待する場合には、コアが
Ｐ２０□十５ｊ−０２系ガラスからなる光ファイ・・（
１））を用いればよい。If standard operation is expected between these, an optical fiber whose core is made of P20□15j-02 glass...
1)) may be used.
第６図及び第４図は、本発明の２通りの実施例における
部分説明図であり、１′は伝送用光ファイバを腹数本束
ねたものである。FIG. 6 and FIG. 4 are partial explanatory views of two embodiments of the present invention, and 1' is a bundle of transmission optical fibers.
この束１′に加熱端子７が巻付けられており、断熱層９
を介しであるいは介さずにモニタ用光ファイバ２が巻回
されており、被覆１０が施されている。A heating terminal 7 is wound around this bundle 1', and a heat insulating layer 9
A monitoring optical fiber 2 is wound with or without the intervening casing, and is coated with a coating 10.
もちろん、本発明はこの図面の構成に限定されるもので
はない。Of course, the present invention is not limited to the configuration shown in this drawing.
以」二説明したような本発明の光伝送路であれば、モニ
タ用光ファイバと加熱装置とを有機的に結合することに
より、被曝による伝送損失の増加を加熱によって直ちに
回復することができるので光伝送路の信頼性が高い。With the optical transmission line of the present invention as described above, by organically coupling the monitoring optical fiber and the heating device, the increase in transmission loss due to exposure to radiation can be immediately recovered by heating. High reliability of optical transmission line.
まだ、加熱は設定された必要最低限の機会のみ行われる
ので、徒らに光ファイバを劣化させることが々く長期間
の実用が可能である。However, since heating is performed only on the minimum necessary occasions, the optical fiber is often unnecessarily deteriorated and can be used for a long period of time.
第１図は本発明の一実施例を示す説明図、第２図はモニ
タ出光コアイノ・の種類による放射線被曝総線量と伝送
損失との関係を示す線図、第６図及び第４図は本発明の
２通りの実施例における部分説明図である。
１：伝送用光コアイノ・、２；モニタ出光コアイノ・、
６・発光装置、４：受光装置、６：加熱装置、７：加熱
端子、８：光パワーメータ。Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is a diagram showing the relationship between total radiation exposure dose and transmission loss depending on the type of monitor output core, and Figs. FIG. 3 is a partial explanatory diagram of two embodiments of the invention. 1: Optical core ino for transmission, 2; Monitor Idemitsu core ino,
6. Light emitting device, 4: Light receiving device, 6: Heating device, 7: Heating terminal, 8: Optical power meter.
Claims (1)
リ′イバ１と、放射線被曝による損失増加量が大きいモ
ニタ用光ファイバ２と、前記損失増加ｍ″が小さい１云
送路用光フアイバ１を加熱するだめの加熱装置６とから
なり、モニタ用光ファイバ２の損失増加量が大きい場合
に前記加熱装置６を作動させることを特徴とする１制放
射線″ＡＳ１云送路。 ２、モニタ用光ファイバ２はコアがＯＨ基をｌｐｐｍ以
下含有する純粋石英であることを特徴とする前項記載の
耐放射線光伝送路。 ６、モニタ用光ファイバ２はコアカＯＨ基ヲ８００ｐｐ
ｍ以−１−含有する純粋石英であることを特徴とする第
１項記載の耐放射線光伝送路。 ４、モニタ用光ファイバ２はコア力Ｐ ２０５＋ Ｓ：
ＬＯ□系ガラスであることを！待機とする第１項記載の
］耐放射線光伝送路。[Scope of Claims] 1. Nine flexible fibers 1 for a transmission line with a small increase in loss due to radiation exposure, a monitoring optical fiber 2 with a large increase in loss due to radiation exposure, and one optical fiber 1 with a small increase in loss m'' due to radiation exposure. 1 radiation control system "AS1" is characterized in that the heating device 6 is used to heat the optical fiber 1 for monitoring, and the heating device 6 is activated when the increase in loss of the optical fiber 2 for monitoring is large. . 2. The radiation-resistant optical transmission line as described in the preceding item, wherein the monitoring optical fiber 2 has a core made of pure quartz containing 1 ppm or less of OH groups. 6. Monitoring optical fiber 2 has a core OH group of 800pp.
2. The radiation-resistant optical transmission line according to claim 1, wherein the radiation-resistant optical transmission line is made of pure quartz containing m or more. 4. The monitoring optical fiber 2 has a core force of P 205+ S:
Make sure it is LO□ type glass! The radiation-resistant optical transmission line according to item 1, which is on standby.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57110173A JPS59102A (en) | 1982-06-25 | 1982-06-25 | Radiation-proof optical transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57110173A JPS59102A (en) | 1982-06-25 | 1982-06-25 | Radiation-proof optical transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59102A true JPS59102A (en) | 1984-01-05 |
Family
ID=14528896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57110173A Pending JPS59102A (en) | 1982-06-25 | 1982-06-25 | Radiation-proof optical transmission line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59102A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6370804A (en) * | 1986-09-13 | 1988-03-31 | Fujikura Ltd | Radiation resistance optical fiber transmission equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5760302A (en) * | 1980-09-29 | 1982-04-12 | Furukawa Electric Co Ltd:The | Method for reducing transmission loss of optical fiber |
-
1982
- 1982-06-25 JP JP57110173A patent/JPS59102A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5760302A (en) * | 1980-09-29 | 1982-04-12 | Furukawa Electric Co Ltd:The | Method for reducing transmission loss of optical fiber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6370804A (en) * | 1986-09-13 | 1988-03-31 | Fujikura Ltd | Radiation resistance optical fiber transmission equipment |
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