JPH0142369B2 - - Google Patents
Info
- Publication number
- JPH0142369B2 JPH0142369B2 JP56180155A JP18015581A JPH0142369B2 JP H0142369 B2 JPH0142369 B2 JP H0142369B2 JP 56180155 A JP56180155 A JP 56180155A JP 18015581 A JP18015581 A JP 18015581A JP H0142369 B2 JPH0142369 B2 JP H0142369B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- rod
- optical
- light transmitting
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 38
- 239000000835 fiber Substances 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 10
- 239000013307 optical fiber Substances 0.000 description 7
- 238000002834 transmittance Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【発明の詳細な説明】
本発明は透過率変化を検出する透過型光センサ
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission type optical sensor that detects changes in transmittance.
空間を通過する液体あるいは気体の透過率変化
を検出するのに光センサが用いられる。 Optical sensors are used to detect changes in transmittance of liquid or gas passing through a space.
光センサは従来第１図のようになつている。即
ち、光源１より一定の強度の光が光フアイバ２へ
導かれ、この光が該光フアイバ２と突き合せ結合
されたオプチカルロツド３へ導かれる。該オプチ
カルロツド３の先端から出た光は検出しようとす
る空間を通過して、該オプチカルロツド３とは離
れて設けられたオプチカルロツド４内へはいる。
該オプチカルロツド４は、多数の光フアイバを撚
り合わせて集合径がオプチカルロツド４のコア径
と略等しいバンドルフアイバ５と結合され更に該
バンドルフアイバ５は図示しない光信号処理装置
と連結される。オプチカルロツド４へ入つた光は
バンドルフアイバ５から光信号処理装置へはい
り、光の透過率変化が検出される。 A conventional optical sensor is as shown in FIG. That is, light of a constant intensity is guided from a light source 1 to an optical fiber 2, and this light is guided to an optical rod 3 which is butt-coupled with the optical fiber 2. The light emitted from the tip of the optical rod 3 passes through the space to be detected and enters the optical rod 4 provided apart from the optical rod 3.
The optical rod 4 is connected to a bundle fiber 5 whose aggregate diameter is approximately equal to the core diameter of the optical rod 4 by twisting a large number of optical fibers, and the bundle fiber 5 is further connected to an optical signal processing device (not shown). . The light that has entered the optical rod 4 enters the optical signal processing device through the bundle fiber 5, where changes in light transmittance are detected.
ところが光源からの光を効率よく検出できるか
否かを決めるオプチカルロツド同志の光軸合せ
は、許容差が小さいので非常に困難である。 However, alignment of the optical axes of the optical rods, which determines whether or not the light from the light source can be detected efficiently, is extremely difficult because the tolerance is small.
そこで本発明は、かかる欠点を緩和し、光の透
過率変化をより効率良く検出できる透過型光セン
サを提供するもので、その構成は、光源からの光
を導く送光用フアイバと連結される送光用ロツド
と、該送光用ロツドからの光を受けるとともに他
端が光信号処理装置へつながれた受光用フアイバ
に連結される受光用ロツドとが対向する透過型光
センサにおいて、単芯のフアイバやロツドからな
る送光用フアイバ、送光用ロツド、受光用ロツド
の順に光の通るコア内径を大きくするとともに対
向する前記送光用ロツドと前記受光用ロツドに接
近してこれらロツド間を平行ビームとする送光レ
ンズと受光レンズとを設けたことを特徴とする。 SUMMARY OF THE INVENTION Therefore, the present invention provides a transmissive optical sensor that can alleviate such drawbacks and detect changes in light transmittance more efficiently. In a transmission type optical sensor, a light transmitting rod and a light receiving rod that receives light from the light transmitting rod and that is connected to a light receiving fiber whose other end is connected to an optical signal processing device are facing each other. The inner diameter of the core through which the light passes is increased in the order of the light transmitting fiber consisting of a fiber or rod, the light transmitting rod, and the light receiving rod. It is characterized by providing a light transmitting lens and a light receiving lens for generating a beam.
以下、本発明を第２図に示す一実施例に基づき
詳細に説明する。 Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIG.
本発明は、従来の透過型光センサを改良したも
のなので同一部品には同一番号を付し、異なると
ころのみを説明する。本発明では送光用フアイバ
としての光フアイバ２と送光用ロツドとしてのオ
プチカルロツド３との結合効率を大きくするため
に、光フアイバ２のコア径よりも大きいコア径を
有するオプチカルロツド３が用いられる。コアは
光が通る部分を示す。更に該オプチカルロツド３
のコア径よりも大きいコア径を有する、受光用ロ
ツドとしてのオプチカルロツド４が用いられる。
そしてオプチカルロツド３から出た光をオプチカ
ルロツド４に効率良く導くためにレンズ６と７が
設けられる。レンズ６はオプチカルロツド３にレ
ンズ７はオプチカルロツド４に夫々接近して取り
付けられる。 Since the present invention is an improvement on the conventional transmission type optical sensor, the same parts are given the same numbers, and only the differences will be explained. In the present invention, in order to increase the coupling efficiency between the optical fiber 2 as a light transmitting fiber and the optical rod 3 as a light transmitting rod, the optical rod 3 has a core diameter larger than that of the optical fiber 2. is used. The core indicates the part through which light passes. Furthermore, the optical rod 3
An optical rod 4 is used as a light-receiving rod, and has a core diameter larger than that of the light receiving rod.
Lenses 6 and 7 are provided to efficiently guide the light emitted from the optical rod 3 to the optical rod 4. The lens 6 and the lens 7 are mounted close to the optical rod 3 and 4, respectively.
かかる透過型光センサにおいて、光源１からの
光は、光フアイバ２からオプチカルロツド３へ伝
わりレンズ６で平行ビームに変換される。この平
行ビームはレンズ７でオプチカルロツド４のコア
に集光され、送光用フアイバとしてのバンドルフ
アイバ５を介して図示しない光信号処理装置へと
伝わる。 In such a transmission type optical sensor, light from a light source 1 is transmitted through an optical fiber 2 to an optical rod 3, and is converted into a parallel beam by a lens 6. This parallel beam is focused on the core of the optical rod 4 by a lens 7, and transmitted to an optical signal processing device (not shown) via a bundle fiber 5 as a light transmission fiber.
以上、一実施例を図面と共に示したように、本
発明にかかる透過型光センサによれば送光用フア
イバ、送光用ロツド、受光用ロツドの順にコアの
内径を大きくし、更に送光用ロツドと受光用ロツ
ドとの間にレンズを設ているので、各部材間の光
軸のズレ及び送光用ロツドと受光用ロツド間の集
光スポツトの広がりによる受光量の低下を抑え透
過率の変化を正確に検出することができる。また
電気的には高絶縁なので爆発の危険性があるとこ
ろにでも使用でき、用途が広い。 As described above with reference to the drawings, one embodiment of the transmission type optical sensor according to the present invention increases the inner diameter of the core in the order of the light transmitting fiber, the light transmitting rod, and the light receiving rod. Since a lens is installed between the rod and the light-receiving rod, the amount of light received is prevented from decreasing due to misalignment of the optical axis between each member and the spread of the light-converging spot between the light-transmitting rod and the light-receiving rod, and the transmittance is improved. Changes can be detected accurately. It also has a wide range of uses, as it has high electrical insulation and can be used in areas where there is a risk of explosion.
なお、送光、受光用のロツド及びフアイバとし
て低損失で高融点の石英系材料を使用することに
より、光源と光信号処理装置との距離を大きくで
き、更にレンズも石英系材料とすれば1000℃以上
の高熱部でも使用することができる。 Furthermore, by using low-loss, high-melting-point quartz-based materials for the rods and fibers for transmitting and receiving light, the distance between the light source and the optical signal processing device can be increased, and if the lens is also made of quartz-based material, the distance can be increased by 1000 mm. Can be used even in high temperature areas of ℃ or higher.
第１図は従来の透過型光センサの説明図、第２
図は本発明に係る透過型光センサの説明図であ
る。
図面中、１は光源、２は光フアイバ、３，４は
オプチカルロツド、５はバンドルフアイバ、６，
７はレンズである。
Figure 1 is an explanatory diagram of a conventional transmission type optical sensor, Figure 2
The figure is an explanatory diagram of a transmission type optical sensor according to the present invention. In the drawing, 1 is a light source, 2 is an optical fiber, 3 and 4 are optical rods, 5 is a bundle fiber, 6,
7 is a lens.
Claims (1)
れる送光用ロツドと、該送光用ロツドからの光を
受けるとともに他端が光信号処理装置へつながれ
た受光用フアイバに連結される受光用ロツドとが
対向する透過型光センサにおいて、単芯のフアイ
バやロツドからなる送光用フアイバ、送光用ロツ
ド、受光用ロツドの順に光の通るコア内径を大き
くするとともに対向する前記送光用ロツドと前記
受光用ロツドに接近してこれらロツド間を平行ビ
ームとする送光レンズと受光レンズとを設けたこ
とを特徴とする透過型光センサ。1. A light transmitting rod connected to a light transmitting fiber that guides light from a light source, and a light receiving rod that receives light from the light transmitting rod and is connected to a light receiving fiber whose other end is connected to an optical signal processing device. In a transmission type optical sensor, the inner diameter of the core through which light passes is increased in the order of the light transmitting fiber made of a single fiber or rod, the light transmitting rod, and the light receiving rod, and the light transmitting rod facing the light transmitting rod faces the light transmitting rod. A transmission type optical sensor characterized in that a light transmitting lens and a light receiving lens are provided close to the rod and the light receiving rod to form a parallel beam between these rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18015581A JPS5880543A (en) | 1981-11-10 | 1981-11-10 | Transmission type photosensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18015581A JPS5880543A (en) | 1981-11-10 | 1981-11-10 | Transmission type photosensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5880543A JPS5880543A (en) | 1983-05-14 |
| JPH0142369B2 true JPH0142369B2 (en) | 1989-09-12 |
Family
ID=16078354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18015581A Granted JPS5880543A (en) | 1981-11-10 | 1981-11-10 | Transmission type photosensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5880543A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990013018A1 (en) * | 1989-04-25 | 1990-11-01 | Tatsuta Electric Wire And Cable Co., Ltd. | Optical liquid sensor, its production method and car oil-and-battery checker using the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1222224B (en) * | 1988-03-25 | 1990-09-05 | Consiglio Nazionale Ricerche | SELF-PARKING OPTICAL SYSTEM FOR SPECTROPHOTOMETRY AND SIMILAR MEASUREMENTS, WITH FIBER OPTIC SENSORS |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551574A (en) * | 1978-06-20 | 1980-01-08 | Matsushita Electric Ind Co Ltd | Fine particle detector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53105783U (en) * | 1977-01-31 | 1978-08-25 |
-
1981
- 1981-11-10 JP JP18015581A patent/JPS5880543A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551574A (en) * | 1978-06-20 | 1980-01-08 | Matsushita Electric Ind Co Ltd | Fine particle detector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990013018A1 (en) * | 1989-04-25 | 1990-11-01 | Tatsuta Electric Wire And Cable Co., Ltd. | Optical liquid sensor, its production method and car oil-and-battery checker using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5880543A (en) | 1983-05-14 |
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