JPH01302129A - Illuminometer for measuring quantity of incident light to optical fiber - Google Patents
Illuminometer for measuring quantity of incident light to optical fiberInfo
- Publication number
- JPH01302129A JPH01302129A JP13161288A JP13161288A JPH01302129A JP H01302129 A JPH01302129 A JP H01302129A JP 13161288 A JP13161288 A JP 13161288A JP 13161288 A JP13161288 A JP 13161288A JP H01302129 A JPH01302129 A JP H01302129A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- light
- angle
- central axis
- circular
- 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 23
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0425—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using optical fibers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0437—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、固有の開口角を持つ光ファイバーに入射する
光量を正確に測定するための照度計に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a luminometer for accurately measuring the amount of light incident on an optical fiber having a unique aperture angle.
〔従来技術と課題］
光ファイバーに入射する光量を測定する簡便な方法とし
て、光電変換素子を有する一般的な照度計を用いること
が考えられる。[Prior Art and Problems] As a simple method for measuring the amount of light incident on an optical fiber, it is possible to use a general illuminance meter having a photoelectric conversion element.
ところが、−船釣な照度計は光の入射角の余弦に比例す
る角特性を持つようにつくられており、それ以外の角特
性に対応できるようにはつくられていない。However, the illuminance meters used on boats are made to have angular characteristics that are proportional to the cosine of the angle of incidence of light, and are not made to accommodate other angular characteristics.
一方、光ファイバーは開口角以内の入射光であればほぼ
均一な強度で伝達されるが、開口角を越える角度を持つ
入射光はファイバー内で２、激に減衰してしまうため、
見かけ上は開口部を端とする短形に近い入射角特性を示
す。かかる理由により、−ｉ的な照度計は光ファイバー
によって伝達される光の量を入射側で測定するための測
定器としては適当ではなかった。On the other hand, in an optical fiber, if the incident light is within the aperture angle, it is transmitted with almost uniform intensity, but the incident light with an angle exceeding the aperture angle is severely attenuated within the fiber.
Apparently, it exhibits incident angle characteristics similar to a rectangular shape with the aperture as the end. For this reason, the -i illumination meter is not suitable as a measuring instrument for measuring the amount of light transmitted by an optical fiber on the input side.
本発明は上記のような問題点に鑑みてなされたもので、
受光角を光ファイバーの開口角にほぼ−致させることが
できる光ファイバー入射光量測定用照度計を提供せんと
するものである。The present invention was made in view of the above-mentioned problems.
It is an object of the present invention to provide an illuminance meter for measuring the amount of light incident on an optical fiber, which allows the acceptance angle to approximately match the aperture angle of the optical fiber.
本発明は上記の目的を達成するために、照度計の受光系
として、２以上の円形開口を共通の中心軸に対して同心
状にかつ平行に配置するとともに、これらの円形開口の
内周と中心軸を含む一つの垂直平面との交点であって中
心軸に対して同じ側にある点を結んだ直線と中心軸との
なす角が光ファイバーの間口角とほぼ一致するように構
成したものである。すなわち２以上の円形開口によって
光電変換素子への入射光を絞り込むことにより、該光電
変換素子の入射角特性を光ファイバーの間口角に一致さ
せようとするものである。In order to achieve the above object, the present invention has two or more circular apertures arranged concentrically and parallel to a common central axis as a light receiving system of an illumination meter, and the inner periphery of these circular apertures and It is constructed so that the angle between the central axis and a straight line connecting points on the same side of the central axis that intersect with a vertical plane that includes the central axis almost coincides with the frontage angle of the optical fiber. be. That is, by narrowing down the light incident on the photoelectric conversion element using two or more circular apertures, the incident angle characteristic of the photoelectric conversion element is made to match the frontage angle of the optical fiber.
第１図に本発明の実施例を示す。同図において、１ａ及
び１ｂは遮光体、２ａ及び２ｂは前記遮光体１ａ及び１
ｂに設けた円形開口である。これらの円形開口２ａ及び
２ｂは共通の中心軸ｘ−ｘ’に対して一定の距離りをお
いて同心状にかつ平行に配置されている。３は円形間口
２ｂの後方に配置されたフィルター、４６はフィルター
３の後方に配置された光電変換素子である。本発明はか
がる構成において、円形間口２ａ及び２ｂの内周と中心
軸ｘ−ｘ’を含む一つの垂直面との交点であって中心軸
ｘ−ｘ’に対して同じ側にある点ＰＩｎＰｔ又はｐ、ｌ
、ｐ！′を結んだ直線！、又は１２がそれぞれ中心軸ｘ
−ｘ’となす角αを光ファイバーの間口角とほぼ一致す
るようにしたものである。このようにするためには、光
ファイバーの開口角をα、円形開口２ａ及び２ｂの直径
をそれぞれＤｌ及びＤよ、百円形開口２ａ・２ｂ間の距
離をＬとした場合に、α＝ ｊａｎ−冒一り、二ニー」
ユ １Ｌ
なる式を満足するようにり、、Ｄ２及びＬを決めればよ
い。また、光電変換素子４は円形間口２ｂを通過した光
を殆んど漏れなく受光できる大きさにしておく必要があ
る。上記のような構成によって得られる充電変換素子の
受光角特性を第２図に示す。FIG. 1 shows an embodiment of the present invention. In the figure, 1a and 1b are light shielding bodies, and 2a and 2b are the light shielding bodies 1a and 1.
It is a circular opening provided in b. These circular openings 2a and 2b are arranged concentrically and parallel to a common central axis x-x' at a constant distance. 3 is a filter placed behind the circular opening 2b, and 46 is a photoelectric conversion element placed behind the filter 3. In the configuration of the present invention, the intersection point between the inner periphery of the circular openings 2a and 2b and one vertical plane including the central axis x-x' and which is on the same side with respect to the central axis x-x' PInPt or p, l
,p! A straight line connecting ′! , or 12 are respectively the central axis x
The angle α formed with -x' is made to almost match the frontage angle of the optical fiber. In order to do this, if the aperture angle of the optical fiber is α, the diameters of the circular apertures 2a and 2b are Dl and D, respectively, and the distance between the hundred circular apertures 2a and 2b is L, then α = jan - One, two.”
, D2 and L should be determined so as to satisfy the expression U 1L . Further, the photoelectric conversion element 4 needs to be sized so that it can receive the light that has passed through the circular opening 2b with almost no leakage. FIG. 2 shows the light-receiving angle characteristics of the charge conversion element obtained with the above configuration.
同図中、β−αは誤差成分であるが、これをｅとすると
、
これはり、、Ｄ、を小さくするが、あるいはＬを大きく
することにより、小さくすることができる。In the figure, β-α is an error component, and if this is e, then this can be reduced by decreasing D, or by increasing L.
この誤差成分ｅの値がどの程度になるかを具体的実施例
との関連に示せば、α＝３０” 、［）＋＝０．５柵φ
、Ｄｚ ＝１７．８ｍｍφ、Ｌ＝１５ｍｍの場合にｅ＝
約１．４’となる。To show the value of this error component e in relation to a specific example, α = 30'', [) + = 0.5 fence φ
, when Dz = 17.8 mmφ and L = 15 mm, e =
It will be about 1.4'.
なお、第１図には円形開口を２つ設けた例を示したが、
第３図のように円形開口を３つもしくはそれより多くす
ることも可能である。また、第１図及び第３図に示す例
では、光電変換素子４に近い円形開口はど径を大きくし
であるが、第４図に示すように光電変換素子４に近い円
形開口はど径を小さくしてもよい。Although FIG. 1 shows an example in which two circular openings are provided,
It is also possible to have three or more circular apertures as shown in FIG. In addition, in the examples shown in FIGS. 1 and 3, the circular aperture near the photoelectric conversion element 4 has a large diameter, but as shown in FIG. may be made smaller.
さらに、第１図、第３図及び第４図に示すような円形開
口を設けた遮光体１ａ・１ｂ・・・に代えて、第５図に
示すように、内面に無反射処理を施した頂角２αの中空
円錐体の頂部を切断して円形開口り、、Ｄ、を形成した
筒体５を入射光制御体として用いることもできる。Furthermore, instead of the light shielding bodies 1a, 1b, etc. provided with circular openings as shown in Figs. 1, 3, and 4, anti-reflection treatment was applied to the inner surface as shown in Fig. 5. A cylindrical body 5 formed by cutting off the top of a hollow cone with an apex angle of 2α to form a circular opening, D, can also be used as the incident light control body.
以上説明したように、本発明に係る照度計は光電変換素
子の前面に適数の円形開口を設けた簡単な構成で、光フ
ァイバーの入射角特性に近似した受光角特性を持たせる
ことができるので、光ファイバーによって伝達される光
量を光ファイバーの光入射側で正確に測定できるという
利点がある。As explained above, the illumination meter according to the present invention has a simple configuration in which an appropriate number of circular apertures are provided in front of the photoelectric conversion element, and can have acceptance angle characteristics that approximate the incident angle characteristics of an optical fiber. This method has the advantage that the amount of light transmitted by the optical fiber can be accurately measured on the light input side of the optical fiber.
第１図は本発明に係る光ファイバー入射光量測定用照度
計の一例を示す原理図、第２図は同照度計の受光角特性
図、第３図及び第４図は本発明の他の実施例の原理図、
第５図は本発明の更に他の実施例に用いる入射光制御体
の断面図である。
第１図において、１ａ・ｔｂ・・・遮光体、２ａ・２ｂ
・・・円形開口、４・・・光電変換素子、ｘ−ｘ’・・
・中心軸。Fig. 1 is a principle diagram showing an example of an illuminometer for measuring the amount of incident light on an optical fiber according to the present invention, Fig. 2 is a light reception angle characteristic diagram of the illuminometer, and Figs. 3 and 4 are other embodiments of the present invention. principle diagram,
FIG. 5 is a sectional view of an incident light control body used in still another embodiment of the present invention. In Fig. 1, 1a/tb... light shielding body, 2a/2b
...Circular aperture, 4...Photoelectric conversion element, x-x'...
・Central axis.
Claims (2)
にかつ平行に配置された２以上の円形開口を有し、これ
らの円形開口の内周と中心軸を含む一つの垂直平面との
交点であって中心軸に対して同じ側にある点を結んだ直
線と中心軸のなす角が光ファイバーの開口角とほぼ一致
するように構成された受光系を有する光ファイバー入射
光量測定用照度計。(1) A vertical plane that has two or more circular openings arranged concentrically and parallel to each other at a certain distance from a common central axis, and that includes the inner periphery and central axis of these circular openings. illuminance for measuring the amount of light incident on an optical fiber, which has a light-receiving system configured such that the angle formed by the central axis and a straight line connecting points on the same side of the central axis that are intersection points with the central axis approximately coincides with the aperture angle of the optical fiber Total.
円形開口を通過した光を殆んど漏れなく受光できる大き
さの光電変換素子を有する特許請求の範囲第１項記載の
光ファイバー入射光量測定用照度計。(2) Amount of light incident on the optical fiber according to claim 1, which has a photoelectric conversion element of a size that can receive almost no leakage of light that has passed through the circular aperture closest to the photoelectric conversion element among the two or more circular apertures. Light meter for measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13161288A JPH01302129A (en) | 1988-05-31 | 1988-05-31 | Illuminometer for measuring quantity of incident light to optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13161288A JPH01302129A (en) | 1988-05-31 | 1988-05-31 | Illuminometer for measuring quantity of incident light to optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01302129A true JPH01302129A (en) | 1989-12-06 |
Family
ID=15062137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13161288A Pending JPH01302129A (en) | 1988-05-31 | 1988-05-31 | Illuminometer for measuring quantity of incident light to optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01302129A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009250705A (en) * | 2008-04-03 | 2009-10-29 | Fujitsu Ltd | Light guiding mechanism for illumination sensor and mobile phone |
-
1988
- 1988-05-31 JP JP13161288A patent/JPH01302129A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009250705A (en) * | 2008-04-03 | 2009-10-29 | Fujitsu Ltd | Light guiding mechanism for illumination sensor and mobile phone |
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