JPS6224243Y2 - - Google Patents
Info
- Publication number
- JPS6224243Y2 JPS6224243Y2 JP1982201136U JP20113682U JPS6224243Y2 JP S6224243 Y2 JPS6224243 Y2 JP S6224243Y2 JP 1982201136 U JP1982201136 U JP 1982201136U JP 20113682 U JP20113682 U JP 20113682U JP S6224243 Y2 JPS6224243 Y2 JP S6224243Y2
- Authority
- JP
- Japan
- Prior art keywords
- core
- silicone rubber
- optical fiber
- cladding
- refractive index
- 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
- 229920002379 silicone rubber Polymers 0.000 claims description 23
- 239000004945 silicone rubber Substances 0.000 claims description 23
- 239000013307 optical fiber Substances 0.000 claims description 17
- 238000005253 cladding Methods 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 13
- 238000001514 detection method Methods 0.000 description 7
- 239000000835 fiber Substances 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229910005793 GeO 2 Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 dimethylsiloxane Chemical class 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
Description
【考案の詳細な説明】
本考案はガソリン、灯油、重油等の油類を検知
できる光フアイバに関し、機械的強度に優れ、し
かも油検知感度の良好な光フアイバに関する。[Detailed Description of the Invention] The present invention relates to an optical fiber that can detect oils such as gasoline, kerosene, and heavy oil, and more particularly to an optical fiber that has excellent mechanical strength and good oil detection sensitivity.
油類を検知する光フアイバとして従来第１図、
第２図に示すようなものがある。 Conventional optical fibers used to detect oils are shown in Figure 1.
There is something like the one shown in Figure 2.
この光フアイバＡは石英ガラス又は多成分ガラ
ス等から成るコアａと、シリコーンゴム或は弗素
系樹脂等のプラスチツクから成るクラツドｂから
構成されている。この光フアイバＡに発光素子Ｃ
より入射した光はクラツドｂの境界面を反射し
つゝコアａ内を透過して受光素子ｄに達する。こ
の場合光フアイバＡに油類が付着するとプラスチ
ツククラツドｂが膨潤し、油がコアまで浸透して
その屈折率が変化し、光がその部分より外部へ洩
れるか或は吸収されて受光素子ｄに到達する光量
が減少する。この光量変化を監視することにより
油漏れの有無を検知することができる。 This optical fiber A is composed of a core a made of quartz glass or multi-component glass, and a clad b made of plastic such as silicone rubber or fluorine resin. A light emitting element C is attached to this optical fiber A.
The incident light is reflected from the boundary surface of the cladding b, passes through the core a, and reaches the light-receiving element d. In this case, when oil adheres to the optical fiber A, the plastic clad b swells, and the oil penetrates into the core, changing its refractive index, and light leaks out from that part or is absorbed and passes through the light receiving element d. The amount of light reaching the area decreases. By monitoring this change in the amount of light, it is possible to detect the presence or absence of oil leakage.
しかしプラスチツククラツドが油により膨潤し
てその屈折率が短時間で充分大きく変化するため
にはクラツド層ｂの厚さが数10μｍ以下でなけれ
ばならず、その様にクラツド層ｂが薄いとフアイ
バ製造時や布設時に外傷を受け易く、又強度が極
めて弱いものになるという難点がある。 However, in order for the plastic cladding to swell with oil and have a sufficiently large change in its refractive index in a short period of time, the thickness of the cladding layer b must be several tens of micrometers or less, and if the cladding layer b is thus thin, the fiber It has the disadvantage that it is easily damaged during manufacturing and installation, and its strength is extremely low.
本考案はこの難点を解消するため第３図に示す
ように、石英系ガラス製のコア１の外周に、シリ
コンゴム製のコア２を形成し、その外周にシリコ
ンゴム製のクラツド３を形成してなるものであ
る。 In order to solve this problem, the present invention, as shown in Fig. 3, forms a core 2 made of silicone rubber on the outer periphery of a core 1 made of quartz glass, and a cladding 3 made of silicone rubber is formed on the outer periphery of the core 2. This is what happens.
コアを形成する石英系ガラスとしては、純石英
ガラス、GeO2、P2O5、B2O3、Ｆなどのドープ剤
をドープした石英ガラスを用いる。 As the silica-based glass forming the core, pure silica glass, quartz glass doped with a dopant such as GeO 2 , P 2 O 5 , B 2 O 3 , F, etc. is used.
コア２を形成するシリコンゴムとしては、屈折
率が石英系ガラスのそれよりもわずかに小さいも
のか、又はそれと同じものか、又はそれよりもわ
ずかに大きいものを用いる。このようなシリコン
ゴムとしては、シリコンゴムのメチル基をフエニ
ル基で一部変性したものがある。 As the silicone rubber forming the core 2, one whose refractive index is slightly smaller than, the same as, or slightly larger than that of quartz glass is used. As such silicone rubber, there is one in which the methyl groups of silicone rubber are partially modified with phenyl groups.
クラツド３を形成するシリコンゴムは、コア２
を形成するシリコンゴム２より屈折率の小さいも
のを用いる。その一例としてはジメチルシロキサ
ンからなるシリコンゴムがあり、通常1.40〜1.41
程度の屈折率を有するものを使用する。 The silicone rubber forming the cladding 3 is the core 2.
A material having a refractive index smaller than that of the silicone rubber 2 forming the silicone rubber is used. One example is silicone rubber made of dimethylsiloxane, which typically has a 1.40 to 1.41
Use a material with a refractive index of approximately
クラツド３は薄ければ油検知感度が向上するが
フアイバの光伝送損失は悪くなり、厚いと油検知
感度は悪くなるがフアイバの光伝送損失と機械的
強度が良くなる。そのためクラツド３は約10μｍ
程度が適当である。 If the cladding 3 is thin, the oil detection sensitivity will be improved, but the optical transmission loss of the fiber will be poor; if the cladding 3 is thick, the oil detection sensitivity will be poor, but the optical transmission loss and mechanical strength of the fiber will be improved. Therefore, Clad 3 is approximately 10μm
The degree is appropriate.
シリコンゴム製のコア２は、厚ければ機械的強
度が強くなると同時に光伝送損失も低下するた
め、クラツド３とシリコンゴム製のコア２との厚
さは25μｍ程度が適当である。 The thicker the core 2 made of silicone rubber, the stronger its mechanical strength and the lower the optical transmission loss. Therefore, the appropriate thickness of the cladding 3 and the core 2 made of silicone rubber is about 25 μm.
石英系ガラス製のコア１の径は、シリコンゴム
製のコア２が厚ければ太い方がよい。 The diameter of the core 1 made of quartz glass is preferably thicker if the core 2 made of silicone rubber is thicker.
本考案の実施例として次のような光フアイバを
形成した。 As an example of the present invention, the following optical fiber was formed.
屈折率ｎ＝1.488のGeO2をドープした石英ガラ
スを200μｍに線引し、線引直後に同工程内で屈
折率ｎ＝1.473のシリコンゴムを厚さ15μｍに被
覆し、更にその上に屈折率ｎ＝1.4508のシリコン
ゴムを厚さ10μｍに被覆して光フアイバを作つ
た。 Quartz glass doped with GeO 2 with a refractive index of n=1.488 is drawn to a thickness of 200 μm, and immediately after drawing, silicone rubber with a refractive index of n=1.473 is coated to a thickness of 15 μm in the same process. An optical fiber was made by coating silicone rubber with n=1.4508 to a thickness of 10 μm.
この光フアイバは油検知能力が優れ、機械的強
度も優れ、引張破断強度は約５Kg／Fiberであり
極めて優れたものとなつた。尚従来の光フアイバ
では約1.0Kg／Fiberであつた。 This optical fiber has excellent oil detection ability and excellent mechanical strength, and has an extremely excellent tensile strength at break of about 5 kg/fiber. In addition, the weight of conventional optical fiber was approximately 1.0 kg/fiber.
又上記実施例におけるシリコンゴム製コア２の
厚さ15μｍ、クラツド３の厚さ10μｍの代りに、
厚さ25μｍのシリコンゴムクラツドを被覆したと
ころ、この従来型の光フアイバでは油検知感度が
低く、実用上使用できなかつた。 Also, instead of the silicone rubber core 2 having a thickness of 15 μm and the cladding 3 having a thickness of 10 μm in the above embodiment,
When coated with a 25 μm thick silicone rubber cladding, this conventional optical fiber had low oil detection sensitivity and could not be used practically.
本考案は叙上のように、コア１，２を二層に
し、しかもその外側に外側のコア２より屈折率の
小さいシリコンゴム製のクラツド３を形成してな
るため、機械的強度に優れ、しかも油検知感度の
良好な光フアイバとなる。 As mentioned above, the present invention has two layers of cores 1 and 2, and a silicone rubber cladding 3 having a smaller refractive index than the outer core 2 is formed on the outside thereof, so it has excellent mechanical strength. Moreover, it becomes an optical fiber with good oil detection sensitivity.
第１図は従来の光フアイバによる油検知方法の
説明図、第２図は従来の光フアイバの端面図、第
３図は本考案に係る光フアイバの一例を示す端面
図である。
１は石英ガラス系のコア、２はシリコンゴム製
のコア、３はクラツド。
FIG. 1 is an explanatory diagram of a conventional oil detection method using an optical fiber, FIG. 2 is an end view of the conventional optical fiber, and FIG. 3 is an end view showing an example of the optical fiber according to the present invention. 1 is a quartz glass core, 2 is a silicone rubber core, and 3 is a cladding.
Claims (1)
製のコアを設け、その外側にコアを形成するシ
リコンゴムより屈折率の小さいシリコンゴム製
のクラツドを設けてなる油等の検知用光フアイ
バ。 (2) コアを形成するシリコンゴムは、屈折率が石
英系ガラスのそれよりもわずかに小さいか又は
それと同じか又はそれよりもわずかに大きいも
のである実用新案登録請求の範囲第１項記載の
油等の検知用光フアイバ。[Scope of Claim for Utility Model Registration] (1) A core made of silicone rubber is provided around the outer periphery of a core made of quartz glass, and a cladding made of silicone rubber with a refractive index smaller than that of the silicone rubber forming the core is provided on the outside of the core. Optical fiber for detecting oil, etc. (2) The silicone rubber forming the core has a refractive index that is slightly smaller than, the same as, or slightly larger than that of silica-based glass. Optical fiber for detecting oil, etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20113682U JPS59104104U (en) | 1982-12-28 | 1982-12-28 | Optical fiber for detecting oil etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20113682U JPS59104104U (en) | 1982-12-28 | 1982-12-28 | Optical fiber for detecting oil etc. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59104104U JPS59104104U (en) | 1984-07-13 |
| JPS6224243Y2 true JPS6224243Y2 (en) | 1987-06-20 |
Family
ID=30426646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20113682U Granted JPS59104104U (en) | 1982-12-28 | 1982-12-28 | Optical fiber for detecting oil etc. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59104104U (en) |
Citations (2)
| 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 |
| JPS57106838A (en) * | 1980-12-24 | 1982-07-02 | Fujitsu Ltd | Optical fiber for sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5569316U (en) * | 1978-11-07 | 1980-05-13 |
-
1982
- 1982-12-28 JP JP20113682U patent/JPS59104104U/en active Granted
Patent Citations (2)
| 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 |
| JPS57106838A (en) * | 1980-12-24 | 1982-07-02 | Fujitsu Ltd | Optical fiber for sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59104104U (en) | 1984-07-13 |
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