JPS59182404A - Radiation resistant optical fiber cable - Google Patents
Radiation resistant optical fiber cableInfo
- Publication number
- JPS59182404A JPS59182404A JP5835983A JP5835983A JPS59182404A JP S59182404 A JPS59182404 A JP S59182404A JP 5835983 A JP5835983 A JP 5835983A JP 5835983 A JP5835983 A JP 5835983A JP S59182404 A JPS59182404 A JP S59182404A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- optical fiber
- heating element
- radiation
- temperature
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 44
- 230000005855 radiation Effects 0.000 title claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 abstract description 19
- 230000006866 deterioration Effects 0.000 abstract description 4
- -1 polyethylene Polymers 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000004677 Nylon Substances 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 229920001778 nylon Polymers 0.000 abstract description 3
- 229920000573 polyethylene Polymers 0.000 abstract description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003063 flame retardant Substances 0.000 abstract description 2
- 229920000728 polyester Polymers 0.000 abstract description 2
- 239000010453 quartz Substances 0.000 abstract description 2
- 125000006850 spacer group Chemical group 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 6
- 238000004804 winding Methods 0.000 description 4
- 230000002542 deteriorative effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229920000271 Kevlar® Polymers 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- BIJOYKCOMBZXAE-UHFFFAOYSA-N chromium iron nickel Chemical compound [Cr].[Fe].[Ni] BIJOYKCOMBZXAE-UHFFFAOYSA-N 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- ZAUUZASCMSWKGX-UHFFFAOYSA-N manganese nickel Chemical compound [Mn].[Ni] ZAUUZASCMSWKGX-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Insulated Conductors (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、放射線環境下において用いられる耐放射線用
光フアイバケーブルに関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a radiation-resistant optical fiber cable used in a radiation environment.
（発明の技術的背景）
現在、光フアイバ技術の進歩に伴なって光ファイバ若し
くは光フアイバケーブルの応用分野が急速に拡大してい
る。そして、この応用分野の一つとして原子力発電所等
の放射線雰囲気中において光７アイバケーブルを用いる
ことが種々検討され、又実用化されている。(Technical Background of the Invention) Currently, with the progress of optical fiber technology, the field of application of optical fibers or optical fiber cables is rapidly expanding. As one of the application fields, various studies have been made on the use of optical fiber cables in radiation atmospheres such as nuclear power plants, and the use thereof has been put into practical use.
ところで、従来、紫外線領域には放射線によりカラーセ
ンター（色中心）と呼ばれる光吸収帯が発生することが
知られており、光フアイバ全放射線雰囲気中に配置して
このファイバにより光伝送を行なった場合前述の吸収帯
によって光吸収損失が増加し、伝送特性が低下する。特
にコア中に龜やＰ＝ｉ含む光ファイバにおいてはこれら
ドーパントが放射線の影響を受けることから伝送特性の
低下が著しい。By the way, it has been known that radiation causes a light absorption band called a color center in the ultraviolet region, and if an optical fiber is placed in a full radiation atmosphere and light is transmitted through this fiber. The above-mentioned absorption band increases optical absorption loss and deteriorates transmission characteristics. Particularly in optical fibers containing dopants or P=i in the core, these dopants are affected by radiation, resulting in a significant deterioration in transmission characteristics.
例えば、純石英コアを有するファイバに波長（λ）＝０
．８４μｍの光を入射し、この光ファイバに６０ＣＯｒ
線を徐々に増加させつつ照射したときの光損失量は、第
１図に示すように、非線形的に増加する。For example, in a fiber with a pure silica core, the wavelength (λ) = 0
．． 84 μm light is input to this optical fiber, and 60 COr is applied to this optical fiber.
As shown in FIG. 1, the amount of light loss when irradiating the light while gradually increasing the number of lines increases non-linearly.
但し、この光ファイバのＯＨ基は２（ＰＰｍ）、γ線の
単位時間の照射増加量は７ Ｘ １０４ （１’ＭＨ）
である。However, the OH group of this optical fiber is 2 (PPm), and the increase in irradiation amount of gamma rays per unit time is 7 x 104 (1'MH).
It is.
また、缶とＰをドープしたＧＩ型光ファイバにλ＝０．
８４μｍの光音入射し、同様にγ線を照射したときの光
損失量は、第２図に示すように、線形的に、しかも急激
に増加する。但し、γ線の単位時間の照射増加量は３０
（Ｒ／Ｈ）である。In addition, λ=0.
When a light beam of 84 μm is incident and γ-rays are similarly irradiated, the amount of optical loss increases linearly and rapidly, as shown in FIG. However, the increase in irradiation amount of gamma rays per unit time is 30
(R/H).
（背景技術の問題点）
このように、光ファイバは放射線によジ光伝送損失が増
大するが、従来、放射線雰囲気中で用いられる光フアイ
バケーブルでは、その心線としての光ファイバが単に組
み込まれているだけなので、即ち伺んら耐放射線対策の
ための構造を有しないので、伝送特性が著しく低下して
しまう欠点があった０
本発明の目的は、放射線環境下において伝送特性が劣化
することのない耐放射線用光ファイバケーブル金提供す
ることにある。(Problems with the Background Art) As described above, optical fibers suffer from increased optical transmission loss due to radiation, but conventionally, in optical fiber cables used in radiation atmospheres, optical fibers as core wires are simply incorporated. However, since it does not have a structure for radiation resistance, it has the disadvantage that the transmission characteristics deteriorate significantly.The purpose of the present invention is to prevent the transmission characteristics from deteriorating in a radiation environment. We aim to provide a radiation resistant fiber optic cable.
（発明の概要）
ところで、光ファイバの放射線による伝送損失の増大は
周囲温度によって影響を受け、周囲温度が高いと伝送損
失が抑制される。即ち、純石英コアを有する光ファイバ
にλ＝０．８４μｍの光音入射し、この光ファイバに６
０ＣＯγ？ｆｊを６．２ Ｘ １０’ （Ｒ／Ｈ）の割
合で増加させて８．７Ｘ１０６（几〕照射すると、光フ
ァイバの光損失量は、第３図に示すように、温度の上昇
に伴なって減少し、約５０℃から急激に低下する。(Summary of the Invention) Incidentally, an increase in transmission loss due to radiation in an optical fiber is affected by the ambient temperature, and when the ambient temperature is high, the transmission loss is suppressed. That is, a light sound of λ = 0.84 μm is incident on an optical fiber having a pure silica core, and a light wave of 6
0COγ? When fj is increased at a rate of 6.2 x 10' (R/H) and 8.7 The temperature decreases rapidly from about 50°C.
本発明は、光ファイバの放射線による伝送損失が温度依
存性全層することに着目してなされたものであり、光フ
アイバ心線とテンシロンメンバを含む光フアイバケーブ
ル内に発熱体を設けてケーブル内部温度を所定温度に保
持し、これにより各光フアイバ心線の光伝送損失を抑制
し、ケーブル自体の伝送特性の低下を防止したことを特
徴とする。The present invention was made based on the fact that transmission loss due to radiation in optical fibers is temperature-dependent throughout all layers. The cable is characterized in that the temperature is maintained at a predetermined temperature, thereby suppressing optical transmission loss of each optical fiber core wire and preventing deterioration of the transmission characteristics of the cable itself.
（発明の実施例） 以下、本発明の実施例を図面を参照して説明する。(Example of the invention) Embodiments of the present invention will be described below with reference to the drawings.
本発明に係る耐放射線用光フアイバケーブルは、第４図
に示すように、中心に後述する発熱体１が配され、この
発熱体１の局面に沿って複数の光フアイバ心線２が介在
６を間に挾んで配置されている。各党ファイバ心線２は
、直径５０μｍの純石英コアと外径１２５μｍのクラッ
ドから成るファイバ素線に、シリコン及びナイロンがそ
れぞれ４００μｍと０．９ ｘｓの厚さに被覆されて形
成されている。介在６には高張力繊維であるケプラ繊維
が用いられている。複数の光フアイバ心線２上には、ポ
リエステルテープがラップ巻きされて成る押え巻４が設
けられ、この押え巻４上にはケブラ繊維又はポリプロピ
レンスプリット紐から成るクッション層５が設けられ、
更にこの上には難燃性のポリエチレンから成る外被６が
設けられている。In the radiation-resistant optical fiber cable according to the present invention, as shown in FIG. are placed in between. Each fiber core wire 2 is formed by coating a fiber wire consisting of a pure quartz core with a diameter of 50 μm and a cladding with an outer diameter of 125 μm with silicon and nylon to a thickness of 400 μm and 0.9×s, respectively. Kepra fiber, which is a high tensile strength fiber, is used for the interposition 6. On the plurality of optical fiber core wires 2, a presser winding 4 made of lap-wound polyester tape is provided, and on this presser wrapper 4 a cushion layer 5 made of Kevlar fiber or polypropylene split string is provided,
Furthermore, a jacket 6 made of flame-retardant polyethylene is provided on top of this.
発熱体１は、タングステンから成り、テンシロンメンバ
を兼ねている。従って、この実施例のケーブルにおいて
はテンシロンメンバを別個に設ける必要がないので、発
熱体１を設けてもケーブル自体の外径寸法が従来と変わ
らず、従ってグープルの大径化を防止できる。The heating element 1 is made of tungsten and also serves as a tensilon member. Therefore, in the cable of this embodiment, there is no need to separately provide a tensilon member, so even if the heating element 1 is provided, the outer diameter of the cable itself remains unchanged from that of the conventional cable, and it is therefore possible to prevent the diameter of the goople from increasing.
次に、本発明の光フアイバケーブルの使用態様を説明す
る。即ち、発熱体１に通電してこの発熱体を発熱させ、
ケーブル内部温度を所定温度に保持した状態で光フアイ
バ心線２によジ光伝送を行なう。この場合光フアイバ心
線２は、第３図に示すように、５０℃から９０℃の範囲
の温度に保持されτいると、放射線の影響による光伝送
損失が少なく、５０℃以下だと光伝送損失が急激に増加
□する。また、９０℃以上だと光伝送損失の抑制効果が
殆んど変化しない。従って、発熱体１の発熱でケーブル
内部温度ｅ５０℃から９０℃の経済的でかつ効果的な温
既範囲に保持すると、ケーブルの光伝送特性が放射線の
影響で劣化するの全有効に防止することができる。この
結果、本発明の光ファイバケーブルを原子炉内に配置し
ても、その光伝送特性が維持されることから大容量の情
報伝達を行うことができる。Next, how the optical fiber cable of the present invention is used will be explained. That is, the heating element 1 is energized to generate heat,
Light is transmitted through the optical fiber core 2 while maintaining the internal temperature of the cable at a predetermined temperature. In this case, as shown in Figure 3, if the optical fiber core wire 2 is maintained at a temperature in the range of 50°C to 90°C, the optical transmission loss due to the influence of radiation will be small, and if it is below 50°C, the optical transmission loss will be small. Losses increase □ rapidly. Moreover, at 90° C. or higher, the effect of suppressing optical transmission loss hardly changes. Therefore, by maintaining the internal temperature of the cable within an economical and effective temperature range of 50°C to 90°C due to the heat generated by the heating element 1, it is possible to effectively prevent the optical transmission characteristics of the cable from deteriorating due to the influence of radiation. I can do it. As a result, even if the optical fiber cable of the present invention is placed inside a nuclear reactor, its optical transmission characteristics are maintained, and a large amount of information can be transmitted.
上述の実施例において、発熱体１としてタングステンの
外にモリブデン、白金などの他の抵抗金属を用いること
ができ、又ニッケルークロム系、鉄−ニッケルークロム
系、ニッケルーマンガン系、ニッケルー銅系、マンガン
−銅系などの各種の合金系も用いることができる。In the above embodiment, other resistance metals such as molybdenum and platinum can be used in addition to tungsten as the heating element 1, and metals such as nickel-chromium, iron-nickel-chromium, nickel-manganese, and nickel-copper can also be used. , various alloy systems such as manganese-copper systems can also be used.
また、外被６としてポリエチレン全周いた場合には６０
℃以上、ナイロンやＰＶＣｔ−用いた場合には１００℃
以上、ＥＴＦＥＴｈ用いた場合には２００℃以上でそれ
ぞれ外被が劣化するので、発熱体１の発熱温度はこれら
外被の劣化温度以下でなければならない。In addition, if polyethylene is used all around as the outer cover 6, 60
℃ or more, 100℃ when using nylon or PVCt-
As mentioned above, when ETFETh is used, the outer sheaths deteriorate at temperatures above 200° C., so the heat generation temperature of the heating element 1 must be below the deterioration temperature of these outer sheaths.
ところで、上述の発熱体１の発熱による抵抗変化を検出
することによりケーブル内の温度管理を容易に行うこと
ができる。この場合別体としてケーブル内に温度により
抵抗が変化する金属を温度センサとして配設することに
よりケーブル内の温第５図及び第６図には本発明の変形
例が示されている。即ち、第５図の例では、発熱体１の
外周に沿って複数の光フアイバ心線２のみが配設され、
この上にそれぞれ押え巻４、クッション層５及び外被６
がこの順で設けられている。By the way, by detecting the change in resistance due to the heat generated by the heating element 1 described above, the temperature inside the cable can be easily controlled. In this case, a modification of the present invention is shown in FIGS. 5 and 6, in which a metal whose resistance changes depending on the temperature is separately disposed inside the cable as a temperature sensor. That is, in the example of FIG. 5, only the plurality of optical fiber core wires 2 are arranged along the outer periphery of the heating element 1,
On top of this are a presser roll 4, a cushion layer 5 and an outer covering 6.
are provided in this order.
第６図の例では、複数の光フアイバ心線２間に複数の小
径の発熱体１が配設され、この上にそれぞれ押え巻４、
クッションＮ５及び外被６がこの順で設けられている。In the example shown in FIG. 6, a plurality of small-diameter heating elements 1 are arranged between a plurality of optical fiber cores 2, and presser windings 4,
A cushion N5 and an outer cover 6 are provided in this order.
この変形例では、枚数の発熱体１が心線２間に分散され
ていることから、外部温度が急激に変化してもその温度
変化に追従させてケーブル内部の温度を常時所定温度に
保持することができる。In this modification, the number of heating elements 1 are distributed between the core wires 2, so that even if the external temperature changes suddenly, the internal temperature of the cable is always maintained at a predetermined temperature by following the temperature change. be able to.
第７図には本発明の他の実施例が示されている。Another embodiment of the invention is shown in FIG.
即ち、この実施例では、中央にＦＲＰテンションメンパ
フが配設され、このテンションメンバの周面に沿って複
数の光フアイバ心線２が配置されている８そして、これ
らテンションメンバ７と光フアイバ心線２上には発熱体
８が被覆され、この発熱体８上にクッション層５及び外
被６がこの順で設けられている。この実施例ではテンシ
ョンメンバ７と発熱体８の両者が別体として設けられて
いるが、発熱体８は被覆層の形態で設けられているので
ケーブル外径が大きくなることはない。尚、この実施例
において、テンションメンバ７に代えて棒状の発熱体（
第４図参照）′ｆｔ設け、この発熱体にテンションメン
バ機能全具備させてもよい。That is, in this embodiment, an FRP tension member puff is arranged in the center, and a plurality of optical fiber cores 2 are arranged along the circumferential surface of this tension member 8. A heating element 8 is coated on the wire 2, and a cushion layer 5 and a jacket 6 are provided on this heating element 8 in this order. In this embodiment, both the tension member 7 and the heating element 8 are provided separately, but since the heating element 8 is provided in the form of a coating layer, the outer diameter of the cable does not become large. In this embodiment, a rod-shaped heating element (
(see FIG. 4), and this heating element may be provided with all tension member functions.
この場合には発熱体８の発熱面積が太きく、シかも発熱
体８．と棒状発熱体の両者がケーブル内部の対向位置で
発熱するので、外部温度が急激に変化してもその温度変
化に追従させてケーブル内部温度を常に均一かつ一定に
保持することができる。In this case, the heating area of the heating element 8 is large, and the heating element 8. Since both the rod-shaped heating element and the rod-shaped heating element generate heat at opposing positions inside the cable, even if the outside temperature changes rapidly, the internal temperature of the cable can be kept uniform and constant at all times by following the temperature change.
第８図には本発明の更に他の実施例が示されている。こ
の実施例では、中央にＦＲＰテンションメンバ７が配設
され、このテンションメンバの周面に沿って複数の光フ
ァイバ心Ｒ２が配置されている。そして、各党ファイバ
心線２上ｅこけ発熱体８′が被覆され、この上に押え巻
４、クッション層５及び外被６がこの順で設けられてい
る。この実施例では各党ファイバ心＋ｉ１２が直接発熱
体８′によシ覆われているので、外部温度の急激な変化
でケーブル内部の温度が変化しても光ファイバ心線２自
体が殆んど温度変化の影響を受けることがない。FIG. 8 shows yet another embodiment of the invention. In this embodiment, an FRP tension member 7 is provided at the center, and a plurality of optical fiber cores R2 are arranged along the circumferential surface of this tension member. Each fiber core 2 is covered with a moss heating element 8', and a presser winding 4, a cushion layer 5, and a jacket 6 are provided in this order. In this embodiment, each fiber core +i12 is directly covered by the heating element 8', so even if the temperature inside the cable changes due to a sudden change in the external temperature, the optical fiber core 2 itself remains at almost the same temperature. Unaffected by change.
尚、この実施例においてもテンションメンバ（７に代え
て棒状の発熱体を設け、この発熱体にテンションメンバ
機能全具備させるようにしてもよい。In this embodiment as well, a rod-shaped heating element may be provided in place of the tension member (7), and this heating element may be provided with all the functions of the tension member.
（発明の効果）
本発明によれば、ケーブル内部に発熱体金膜け、ケーブ
ルの内部温度全所定温度に保持することで、光フアイバ
心線の放射線による光伝送損失を抑制したので、放射線
環境下において伝送特性が低下することのない耐放射線
用光フアイバケーブルを提供することがヤきる。また、
ケーブル内部を一定温度に保持すると、光フアイバ心線
のコアが温度変化により劣化するのを有効に防止できな
いので、長期間に亘って安定して光伝送全行うことがで
きる信頼性の高い耐放射線用光フアイバケーブルが得ら
れる。(Effects of the Invention) According to the present invention, optical transmission loss due to radiation in the optical fiber core wire is suppressed by coating the inside of the cable with a heating element gold film and maintaining the entire internal temperature of the cable at a predetermined temperature. Therefore, it is possible to provide a radiation-resistant optical fiber cable whose transmission characteristics do not deteriorate under conditions of low temperature. Also,
If the inside of the cable is kept at a constant temperature, the core of the optical fiber core cannot be effectively prevented from deteriorating due to temperature changes, so it is highly reliable and radiation-resistant that allows stable optical transmission over long periods of time. An optical fiber cable for use is obtained.
第１図及び第２図は光ファイバの放射線照射量と光損失
量との関係を示す特性図、第３図は光ファイバの放射線
環境下での光損失量と温度との関係を示す特性図、第４
図は本発明に係る耐放射線用光フアイバケーブルの横断
面図、第５図及び第６図はそれぞれ本発明の変形例に係
る横断面図、第７図及び第８図はそれぞれ本発明の他の
実施例に係る横断面図である。
１．８．８′・・・・・・・−・・・・・・発熱体２−
−・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・ 光フアイバ心線３・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
介在４・・・・・・・・・・・・・・・・−・・−・・
・・・・・・・・・・・ 押え巻５・・・・・・・・・
・・・・−・・・・・・・・・・・・・・・・・・・
クッション層６・・・・・・・・・・・・・・・−・・
−・・・・・・・・・・・・・・ 外被７・・・・−・
・・・・・・・・・・・・・・・・−・・・・・・・−
・・ テンションメンバ第１図
第２図 第３図
第４図 第５抱
フ
第、因 第７ＷＪ
第８図
Ｒ′Figures 1 and 2 are characteristic diagrams showing the relationship between the amount of radiation irradiation and the amount of optical loss of an optical fiber, and Figure 3 is a characteristic diagram showing the relationship between the amount of optical loss and temperature in an optical fiber radiation environment. , 4th
The figure is a cross-sectional view of a radiation-resistant optical fiber cable according to the present invention, FIGS. 5 and 6 are cross-sectional views of modifications of the present invention, and FIGS. FIG. 1.8.8'・・・・・・・・・・・・Heating element 2-
−・・・・・・・・・・・・・・・・・・・・・・・・
...... Optical fiber core 3...
・・・・・・・・・・・・・・・・・・・・・・・・
Intervention 4・・・・・・・・・・・・・・・−・・−・・
・・・・・・・・・・・・ Presser winding 5・・・・・・・・・
・・・－・・・・・・・・・・・・・・・・・・
Cushion layer 6・・・・・・・・・・・・・・・・・・
−・・・・・・・・・・・・・ Outer cover 7・・・・−・
・・・・・・・・・・・・・・・・−・・・・・・・−
... Tension member Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Embrace No. 7 WJ Fig. 8 R'
Claims (1)
射線環境下で用いられる光フアイバケーブルであって、
ケーブルの内部温度を所定温度に保持すべくケーブル内
部に発熱体が設せられていることを特徴とする耐放射線
用光フアイバケーブル。 ２、前記ケーブル内部が５０℃から９０℃の範囲に保持
されていることを特徴とする特許請求の範囲第１項に記
載の耐放射線用光フアイバケーブル。 ６、前記発熱体は前記テンシ目ンメンバを兼ねているこ
と′ｔ−特徴とする特許請求の範囲第１項に記載の引数
射線用光ファイバケーブル。 ４、前記発熱体はケーブル内部温度全検出するための温
度センサを兼ねていること′ｆｒ特徴とする特許請求の
範囲第１項に記載の耐放射線用光フアイバケーブル。[Claims] 1. An optical fiber cable including an optical 7-fiber core wire and a tensile member W/member and used in a radiation environment,
A radiation-resistant optical fiber cable characterized in that a heating element is provided inside the cable to maintain the internal temperature of the cable at a predetermined temperature. 2. The radiation-resistant optical fiber cable according to claim 1, wherein the inside of the cable is maintained at a temperature in the range of 50°C to 90°C. 6. The optical fiber cable for argument rays according to claim 1, characterized in that the heating element also serves as the tensile member. 4. The radiation-resistant optical fiber cable according to claim 1, wherein the heating element also serves as a temperature sensor for detecting the entire internal temperature of the cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5835983A JPS59182404A (en) | 1983-04-01 | 1983-04-01 | Radiation resistant optical fiber cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5835983A JPS59182404A (en) | 1983-04-01 | 1983-04-01 | Radiation resistant optical fiber cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59182404A true JPS59182404A (en) | 1984-10-17 |
Family
ID=13082119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5835983A Pending JPS59182404A (en) | 1983-04-01 | 1983-04-01 | Radiation resistant optical fiber cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59182404A (en) |
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-
1983
- 1983-04-01 JP JP5835983A patent/JPS59182404A/en active Pending
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