JPH0250061B2 - - Google Patents
Info
- Publication number
- JPH0250061B2 JPH0250061B2 JP57000417A JP41782A JPH0250061B2 JP H0250061 B2 JPH0250061 B2 JP H0250061B2 JP 57000417 A JP57000417 A JP 57000417A JP 41782 A JP41782 A JP 41782A JP H0250061 B2 JPH0250061 B2 JP H0250061B2
- Authority
- JP
- Japan
- Prior art keywords
- boron
- glass
- mass number
- optical
- glass fiber
- 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 - Lifetime
Links
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 27
- 229910052796 boron Inorganic materials 0.000 claims description 27
- 239000003365 glass fiber Substances 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 description 9
- 238000005253 cladding Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 6
- 238000009377 nuclear transmutation Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 206010073306 Exposure to radiation Diseases 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Glass Compositions (AREA)
Description
【発明の詳細な説明】
発明の技術分野
本発明は中性子被瀑下において特性劣化を生じ
ることのない実用性の高い光通信用ガラスフアイ
バに関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a highly practical glass fiber for optical communications that does not undergo characteristic deterioration when exposed to neutrons.
発明の技術的背景
近時、光フアイバを伝送路として用いた光通信
システムが種々実用化されている。そして、上記
光フアイバを始めとして発光・受光素子の技術開
発が進められている。この種の光通信技術は、放
射線管理域内での情報通信や制御技術分野にも応
用され、主として純粋石英ガラスをコアとして用
いた光フアイバが多く用いられている。この純粋
石英ガラスをコアとした光フアイバは、他のガラ
ス組成からなるものに比して、Ｘ線やγ線被瀑に
よる着色が少なく、上記放射線管理域内での光通
信用媒体として優れた特徴を有している。Technical Background of the Invention Recently, various optical communication systems using optical fibers as transmission paths have been put into practical use. Technological development of light-emitting and light-receiving elements including the above-mentioned optical fibers is progressing. This type of optical communication technology is also applied in the fields of information communication and control technology within radiation control areas, and optical fibers mainly using pure silica glass as the core are often used. This optical fiber with a core made of pure silica glass has less coloration due to exposure to X-rays and gamma rays than those made of other glass compositions, making it an excellent optical communication medium within the above-mentioned radiation control area. have.
背景技術の問題点
ところで、上記純粋石英ガラスをコアとした光
フアイバでは、そのクラツド層の屈折率をコアよ
り小さくする為に、ホウ素(B)やフツ素(F)をドープ
した石英ガラスを用いることが多い。ところが、
このような光フアイバでは、上記ドープ剤として
添加したホウ素(B)のうち、質量数10のホウ素（
10B）が上記放射線管理域にて中性子を吸収し、
核変換反応を生じてリチウム（Li）とα粒子とに
分解することがある。この際、光フアイバのガラ
ス骨格に欠陥が生じ、その機械的強度や光損失等
の特性において大幅な劣化を招来すると云う不具
合を有している。Problems with the Background Art By the way, in the optical fiber with the core made of pure silica glass, silica glass doped with boron (B) or fluorine (F) is used to make the refractive index of the cladding layer smaller than that of the core. There are many things. However,
In such an optical fiber, among the boron (B) added as the doping agent, boron (B) with a mass number of 10 (
10 B) absorbs neutrons in the above radiation control area,
It may cause a nuclear transmutation reaction and decompose into lithium (Li) and alpha particles. At this time, a defect occurs in the glass skeleton of the optical fiber, resulting in a significant deterioration in its properties such as mechanical strength and optical loss.
発明の目的
本発明はこのような事情を考慮してなされたも
ので、その目的とするところは、放射線、特に中
性子被瀑下においても特性劣化を生じることなし
に安定に使用することのできる実用性の高い光通
信用ガラスフアイバを提供することにある。Purpose of the Invention The present invention was made in consideration of the above circumstances, and its purpose is to provide a practical product that can be stably used without deterioration of characteristics even under exposure to radiation, especially neutrons. The purpose of the present invention is to provide a glass fiber for optical communication with high properties.
発明の概要
本発明は石英ガラスを主成分とし、ホウ素(B)を
ドープした組成のガラスを用いて構成される光通
信用のガラスフアイバにおいて、上記ドープ剤と
してのホウ素(B)にその質量数が11であるホウ素
（ 11B）のみを用いたことを特徴とするものであ
る。Summary of the Invention The present invention provides a glass fiber for optical communication constructed using glass having a composition mainly composed of quartz glass and doped with boron (B), in which the mass number of boron (B) as a dopant is It is characterized by the use of only boron ( 11 B), where is 11.
発明の効果
従つて本発明に係るガラスフアイバによれば、
中性子を吸収して核変換反応を生じる質量数10の
ホウ素（ 10B）を含むことがないから、従来の
不具合が全くなく、また質量数11のホウ素（
11B）によつて例えばクラツド層の屈折率をコア
に比して低くすることができるから、所望の光学
的特性を有し、且つ中性子被瀑環境下において特
性劣化を生じることのない安定な光通信用ガラス
フアイバを提供することができる。また核変換反
応を生じることがないから、このガラスフアイバ
を介して例えば原子炉や核融合反応炉内を直視観
察することも可能となり、その実用的利点は非常
に大きい。Effects of the Invention Therefore, according to the glass fiber according to the present invention,
Because it does not contain boron ( 10 B), which has a mass number of 10 and causes transmutation reactions by absorbing neutrons, it does not have any of the conventional problems, and it does not contain boron (10 B), which has a mass number of 11.
11B ), for example, the refractive index of the cladding layer can be made lower than that of the core, so that it has the desired optical properties and is stable and does not deteriorate in properties in an environment exposed to neutrons. A glass fiber for optical communication can be provided. Furthermore, since no transmutation reaction occurs, it is also possible to directly observe the inside of a nuclear reactor or a nuclear fusion reactor through this glass fiber, which has a great practical advantage.
発明の実施例
以下、本発明を実施例につき説明する。実施例
に係る光フアイバは、純粋石英ガラスをコアと
し、ホウ素(B)およびフツ素(F)を添加してなる石英
ガラスをクラツドとし、更にその外周に保護ガラ
ス層を形成することにより、その主たる製造プロ
セスは従来と同様に行われる。但し、上記クラツ
ド層として用いられる石英ガラスへドープする添
加剤としてのホウ素(B)として例えばSiO2−
11B2O3系において、特に質量数が11のホウ素（
11B）のみを選択的に添加するようにしたことを
特徴とする。つまり、ホウ素(B)のうち、質量数が
10のホウ素（ 10B）を用いることなく、質量数
が11のホウ素（ 11B）のみを添加剤として用い
るようにした点を特徴とするものである。EXAMPLES OF THE INVENTION The present invention will now be described with reference to examples. The optical fiber according to the embodiment has a core made of pure quartz glass, a cladding made of quartz glass doped with boron (B) and fluorine (F), and a protective glass layer formed around the outer periphery. The main manufacturing process is carried out as before. However, as boron (B) as an additive to be doped into the quartz glass used as the cladding layer, for example, SiO 2 −
In the 11 B 2 O 3 system, boron with a mass number of 11 (
11 B) is selectively added. In other words, the mass number of boron (B) is
This product is characterized by using only boron with a mass number of 11 ( 11 B) as an additive, without using boron with a mass number of 10 ( 10 B).
周知のように質量数10のホウ素（ 10B）は天
然に19.6％含まれ、中性子線を吸収して質量数７
のリチウム（ 7Li）とα粒子とに分解し、大きな
発熱を伴う。これに対して天然に80.4％含まれる
質量数11のホウ素（ 11B）は、中性子吸収断面
積が著しく小さく、中性子被瀑に対して安定であ
る。従つて、このようなホウ素（ 11B）のみを
ドープした石英ガラスをクラツド層として用いた
ガラスフアイバによれば、次のような効果を奏す
る。 As is well known, boron ( 10 B), which has a mass number of 10, naturally contains 19.6% boron (10 B), which absorbs neutron beams and has a mass number of 7.
decomposes into lithium ( 7 Li) and α particles, accompanied by large heat generation. On the other hand, boron ( 11 B), which has a mass number of 11 and is naturally present at 80.4%, has a significantly small neutron absorption cross section and is stable against neutron attack. Therefore, a glass fiber using silica glass doped only with boron ( 11 B) as a cladding layer has the following effects.
即ち、クラツド層のガラス組成に 10Bが含ま
れないので、中性子被瀑下でガラスフアイバを用
いても機械的強度の劣化や光損失の増大を招くこ
とがない。また中性子吸収による核変換作用によ
つて発熱することもないので、この発熱に伴う問
題も生じることがない等の効果を奏する。つま
り、特性劣化を招くことなく、安定に光通信に供
することが可能となる。また中性子吸収による核
変換反応を生じないので、ガラスフアイバのバン
ドル（束）を形成して、原子炉内部や核融合炉内
部を安全性良く直視することが可能となり、その
実用的利点は絶大である。 That is, since 10 B is not included in the glass composition of the cladding layer, even if the glass fiber is used under neutron fallout, there will be no deterioration in mechanical strength or increase in optical loss. Further, since no heat is generated due to nuclear transmutation caused by neutron absorption, there are no problems associated with this heat generation. In other words, it is possible to stably provide optical communication without causing characteristic deterioration. In addition, since nuclear transmutation reactions due to neutron absorption do not occur, it is possible to form a bundle of glass fibers and directly look into the inside of a nuclear reactor or fusion reactor with high safety, which has tremendous practical advantages. be.
尚、本発明は上記実施例に限定されるものでは
ない。例えばコアの屈折率を変える為にホウ素(B)
をドープする場合にも適用することができ、また
光フアイバの熱膨張係数を制御するべく保護ガラ
ス層にホウ素(B)をドープする場合にも、同様に適
用して実施することができる。その他、ホウ素(B)
のドープ量やガラスフアイバのコア径、屈折等
は、適宜仕様に応じて定めればよいものである。
要するに本発明はその要旨を逸脱しない範囲で
種々変形して実施することができる。 Note that the present invention is not limited to the above embodiments. For example, boron (B) is used to change the refractive index of the core.
It can also be applied to the case where boron (B) is doped into the protective glass layer in order to control the thermal expansion coefficient of the optical fiber. Others, boron (B)
The doping amount, the core diameter of the glass fiber, the refraction, etc. may be appropriately determined according to the specifications.
In short, the present invention can be implemented with various modifications without departing from the gist thereof.
以上詳述したように本発明によれば、シリカ主
成分とし、ホウ素をドープしたガラス組成によつ
て形成されるガラスフアイバの上記ドープ剤とし
てのホウ素(B)に、質量数11のホウ素（ 11B）の
みを用いるようにしたものである。従つて、中性
子被瀑下においても特性劣化を生じることなく、
安定に使用することができると云う、絶大なる効
果を奏する実用性の高い光通信用ガラスフアイバ
をここに提供することができる。 As detailed above, according to the present invention, boron (B) having a mass number of 11 is added to boron (B) as the doping agent of the glass fiber formed by a glass composition doped with boron and having silica as a main component. Only B) is used. Therefore, even when exposed to neutrons, there is no characteristic deterioration,
Here, we can provide a highly practical glass fiber for optical communication that can be stably used, has great effects, and is highly practical.
Claims (1)
した組成のガラスを用いて構成される光通信用ガ
ラスフアイバにおいて、上記ホウ素(B)として質量
数11のホウ素（ 11B）だけを用いたことを特徴
とする光通信用ガラスフアイバ。1 In a glass fiber for optical communication constructed using glass with a composition mainly composed of silica and doped with boron (B), only boron ( 11 B) with a mass number of 11 is used as the boron (B). A glass fiber for optical communication characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57000417A JPS58120533A (en) | 1982-01-06 | 1982-01-06 | Glass fiber for optical communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57000417A JPS58120533A (en) | 1982-01-06 | 1982-01-06 | Glass fiber for optical communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58120533A JPS58120533A (en) | 1983-07-18 |
| JPH0250061B2 true JPH0250061B2 (en) | 1990-11-01 |
Family
ID=11473218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57000417A Granted JPS58120533A (en) | 1982-01-06 | 1982-01-06 | Glass fiber for optical communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58120533A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60159671A (en) * | 1984-01-30 | 1985-08-21 | Sumitomo Electric Ind Ltd | leakage radiation detector |
| US5395783A (en) * | 1993-02-16 | 1995-03-07 | Texas Instruments Incorporated | Electronic device and process achieving a reduction in alpha particle emissions from boron-based compounds essentially free of boron-10 |
-
1982
- 1982-01-06 JP JP57000417A patent/JPS58120533A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58120533A (en) | 1983-07-18 |
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