JPH0226735B2 - - Google Patents
Info
- Publication number
- JPH0226735B2 JPH0226735B2 JP57050033A JP5003382A JPH0226735B2 JP H0226735 B2 JPH0226735 B2 JP H0226735B2 JP 57050033 A JP57050033 A JP 57050033A JP 5003382 A JP5003382 A JP 5003382A JP H0226735 B2 JPH0226735 B2 JP H0226735B2
- Authority
- JP
- Japan
- Prior art keywords
- edge
- image
- fiber
- light leakage
- image 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【発明の詳細な説明】
本発明はイメージフアイバの漏光測定方法に関
し、特にエツジ法に用いて有用なものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring light leakage of an image fiber, and is particularly useful for the edge method.
整列された束状光フアイバを用いて画像を直接
に伝送するイメージフアイバにおいて、その伝送
画像の質を規定する最大の要因として光フアイバ
素線間の漏光量がある。通常の光フアイバケーブ
ルにおいては光フアイバ素線相互の距離を充分に
とること及び夫々の光フアイバ素線に光学的に不
透明なプラスチツク被覆を施すことにより漏光量
は実用上問題のない範囲内に抑えられているが、
イメージフアイバにおいては光フアイバ素線の充
填率を向上せしむべく光フアイバ素線相互間の距
離を極めて短かくしている。一例として光フアイ
バ素線のコア径10μｍ、外径15μｍとした場合、
隣接するコア間の距離は5μｍであり、各画素を
伝播する光のコア外へのしみ出しにより画素間の
漏光を生起する。画素間の漏光量が大となると、
通常光フアイバ素線の総数により決まつている伝
送画像の分解能が低下することとなり、所謂画質
の劣化を招来する。したがつてイメージフアイバ
では画素間の漏光が生じないような構造パラメー
タ（光フアイバ素線のコア径、コア間距離、屈折
率差等）を適切に選択する必要があり、また製造
後所定の性能が満足されているか否かを測定する
必要がある。画質の評価法としては空間周波数領
域で行なうOTF法、MTF法があるが、より直接
的な評価法としては一つの光フアイバ素線に光を
励起し隣接する光フアイバ素線への漏光量を測定
する方法、イメージフアイバの入射端へエツジを
貼り付けてその伝送像を出射端で観測する方法が
ある。この後者の方法はエツジ法と呼称されてい
る。これを更に詳細に説明すると、第１図ａに示
すように、イメージフアイバ１の入射端１ａにエ
ツジ２を貼り付けた後、その入射端１ａに均一な
照明光３を入射せしめて出力端１ｂにおける伝送
像のボケをスリツト付の検出器等で走査記録する
ものである。 In image fibers that directly transmit images using aligned bundled optical fibers, the biggest factor that determines the quality of the transmitted images is the amount of light leakage between the optical fiber strands. In normal optical fiber cables, the amount of light leakage is kept within a range that does not pose a practical problem by keeping sufficient distance between the optical fibers and by coating each optical fiber with an optically opaque plastic coating. Although it is
In image fibers, the distance between the optical fiber strands is extremely short in order to improve the filling rate of the optical fiber strands. As an example, if the core diameter of the optical fiber wire is 10 μm and the outer diameter is 15 μm,
The distance between adjacent cores is 5 μm, and light leakage between pixels occurs due to light propagating through each pixel seeping out of the core. When the amount of light leakage between pixels becomes large,
The resolution of the transmitted image, which is usually determined by the total number of optical fibers, is reduced, resulting in so-called deterioration of image quality. Therefore, for image fibers, it is necessary to appropriately select structural parameters (core diameter of optical fiber, distance between cores, refractive index difference, etc.) to prevent light leakage between pixels, and also to maintain specified performance after manufacturing. It is necessary to measure whether or not the requirements are satisfied. Image quality evaluation methods include the OTF method and MTF method, which are performed in the spatial frequency domain, but a more direct evaluation method involves pumping light into one optical fiber and measuring the amount of light leakage to the adjacent optical fiber. One method is to attach an edge to the input end of an image fiber and observe the transmitted image at the output end. This latter method is called the edge method. To explain this in more detail, as shown in FIG. The blur of the transmitted image is scanned and recorded using a detector with a slit.
ところでかかるエツジ法を用いた場合にはイメ
ージフアイバ１の光フアイバ素線の配列方向とエ
ツジ２の方向が一致していないと測定値にバラツ
キを生じるという問題がある。第２図ａはエツジ
２の方向と光フアイバ素線１ｃの配列方向とが一
致していない場合を示しており、この場合にはイ
メージフアイバ１の出射端１ｂでエツジ２の方向
に検出器のスリツトを一致させて走査すると光フ
アイバ素線１ｃ間の漏光量が存在していない場合
でも第２図ｂに示すようなデータとなる。第２図
ｂにおいて、の部分が不規則な形状となるのは
光フアイバ素線１ｃの配列方向と検出器のスリツ
トの方向（エツジ２の方向）とが一致していない
ためで、の部分が滑らかな形状を示すのは光フ
アイバ素線１ｃ−1，１ｃ−2，１ｃ−3，１ｃ−4
の如く一部がエツジ２で隠蔽されてハーフトーン
となる画素が存在するためである。なお、第２図
ａ中のはこのときの検出器の走査方向である。
一方、第３図ａはイメージフアイバ１の光フアイ
バ素線１ｃの配列方向にエツジ２の方向を一致さ
せた場合で、この場合には検出器のスリツトの方
向とエツジ２の方向とを一致させて走査すると第
３図ｂに示すようなデータとなり漏光量の直読が
可能となる。第３図ｂにおいて10logp1／p0が隣
接画素間の漏光量を示す。また、夫々の光フアイ
バ素線列に対応する光出力の分離観測が可能とな
る。即ち、かかるエツジ法においては入力端１ａ
でエツジ２を光フアイバ素線１ｃの列の中間に
（光フアイバ素線１ｃの列にかからないように）
調整する必要がある。 However, when such an edge method is used, there is a problem in that if the arrangement direction of the optical fiber strands of the image fiber 1 and the direction of the edge 2 do not match, the measured values will vary. FIG. 2a shows a case where the direction of the edge 2 and the arrangement direction of the optical fiber strands 1c do not match, and in this case, the detector is placed in the direction of the edge 2 at the output end 1b of the image fiber 1. If the slits are aligned and scanned, data as shown in FIG. 2b will be obtained even when there is no amount of light leakage between the optical fibers 1c. In Fig. 2b, the part has an irregular shape because the arrangement direction of the optical fibers 1c and the direction of the detector slit (direction of edge 2) do not match, and the part has an irregular shape. Optical fiber wires 1c- 1 , 1c- 2 , 1c- 3 , and 1c- 4 exhibit smooth shapes.
This is because there are pixels that are partially hidden by edge 2, resulting in a halftone. Note that the direction in FIG. 2a is the scanning direction of the detector at this time.
On the other hand, FIG. 3a shows a case where the direction of the edge 2 is made to match the arrangement direction of the optical fiber strands 1c of the image fiber 1. In this case, the direction of the slit of the detector and the direction of the edge 2 are made to match. When the light is scanned, the data shown in FIG. 3b is obtained and the amount of light leakage can be directly read. In FIG. 3b, 10logp 1 /p 0 represents the amount of light leakage between adjacent pixels. Furthermore, it becomes possible to separately observe the optical outputs corresponding to each optical fiber strand array. That is, in this edge method, the input terminal 1a
Place the edge 2 in the middle of the row of optical fibers 1c (so that it does not overlap the row of optical fibers 1c).
Need to adjust.
本発明は、上記の点に鑑み、エツジの調整を容
易になし得るイメージフアイバの漏光測定方法を
提供することを目的とする。かかる目的を達成す
る本発明はイメージフアイバの入射端をモニタ系
により観察する点をその技術思想の基礎とするも
のである。 SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a method for measuring light leakage of an image fiber in which edge adjustment can be easily performed. The present invention, which achieves this object, is based on the technical concept of observing the input end of an image fiber using a monitor system.
以下本発明の実施例を図面に基づき詳細に説明
する。第４図に示すように、イメージフアイバ１
の入射端１ａの近傍にこの入射端に対し傾斜させ
てミラー４を配設する。このときミラー４はその
上端をピン５に回動可能に支持されている。本実
施例のモニタ系である顕微鏡６は前記ミラー４に
写つたイメージフアイバ１の入力端１ａを観察し
得るようになつている。そこで、この顕微鏡６を
介して入力端１ａを観察しながらエツジ２の方向
が前記イメージフアイバ１を構成する光フアイバ
素線１ｃの配列方向と一致するように調整してこ
のエツジ２を前記入力端１ａに貼り付ける。この
ことにより第３図ａに示す状態が確保される。そ
の後、前記ミラー４を図中時計方向に回動するこ
とにより入射端１ａの軸方向に関する延長面から
除去してこの入射端１ａに照明光３を入射せしめ
れば第３図ｂに示す特性が得られる。 Embodiments of the present invention will be described in detail below based on the drawings. As shown in Figure 4, the image fiber 1
A mirror 4 is disposed near the entrance end 1a of the mirror 4 so as to be inclined with respect to the entrance end 1a. At this time, the mirror 4 is rotatably supported by a pin 5 at its upper end. A microscope 6, which is a monitor system in this embodiment, is adapted to be able to observe the input end 1a of the image fiber 1 reflected on the mirror 4. Therefore, while observing the input end 1a through the microscope 6, the direction of the edge 2 is adjusted so that it matches the arrangement direction of the optical fibers 1c constituting the image fiber 1. Paste it on 1a. This ensures the condition shown in FIG. 3a. Thereafter, by rotating the mirror 4 clockwise in the figure, it is removed from the axially extending surface of the incident end 1a and the illumination light 3 is made to enter the incident end 1a, resulting in the characteristics shown in FIG. 3b. can get.
以上実施例とともに具体的に説明したように、
本発明によればイメージフアイバのエツジ法によ
る漏光測定を容易に行なうことができる。 As specifically explained above with the examples,
According to the present invention, light leakage measurement using an image fiber edge method can be easily performed.
第１図はイメージフアイバの漏光測定方法であ
るエツジ法を説明するための説明図、第２図ａは
そのエツジが傾いている場合のエツジとイメージ
フアイバの入射端との位置関係を示す説明図、第
２図ｂは第２図ａの場合のイメージフアイバの出
射端における光出力と検出器位置との関係を示す
特性図、第３図ａはエツジが正常な場合のエツジ
とイメージフアイバの入射端との位置関係を示す
説明図、第３図ｂは第３図ａの場合のイメージフ
アイバの出射端における光出力と検出器位置との
関係を示す特性図、第４図は本発明の実施例を説
明するための説明図である。図面中、
１はイメージフアイバ、１ａは入射端、１ｂは
出射端、２はエツジ、３は照明光、４はミラー、
６は顕微鏡である。
Fig. 1 is an explanatory diagram for explaining the edge method, which is a method for measuring light leakage of an image fiber, and Fig. 2 a is an explanatory diagram showing the positional relationship between the edge and the incident end of the image fiber when the edge is tilted. , Fig. 2b is a characteristic diagram showing the relationship between the optical output at the output end of the image fiber and the detector position in the case of Fig. 2a, and Fig. 3a is a characteristic diagram showing the relationship between the edge and the incidence of the image fiber when the edge is normal. FIG. 3b is a characteristic diagram showing the relationship between the light output at the output end of the image fiber and the detector position in the case of FIG. 3a, and FIG. It is an explanatory diagram for explaining an example. In the drawing, 1 is an image fiber, 1a is an input end, 1b is an output end, 2 is an edge, 3 is an illumination light, 4 is a mirror,
6 is a microscope.
Claims (1)
アイバの入射端面にエツジを固定し、出射端に伝
送される像を観測して漏光を測定するにあたり、
入射端の近傍にミラーを介して入射端面及びエツ
ジを顕微鏡等のモニタ系で観察可能に配置し、エ
ツジの一辺が前記イメージフアイバを構成する光
フアイバ素線の列にかからないように隣接する列
との中間に位置させ、且つ前記光フアイバ素線の
一部を隠蔽するよう調整し、この位置関係を保持
しながら前記エツジを前記入射端面に接触させて
固定し、その後前記ミラーを除去してこの入射端
に照明光を入射せしめるようにしたことを特徴と
するイメージフアイバの漏光測定方法。1. When measuring light leakage by fixing an edge to the input end face of an image fiber, which is an aligned bundle of optical fibers, and observing the image transmitted to the output end,
The input end surface and the edge are arranged near the input end via a mirror so that they can be observed with a monitor system such as a microscope, and the edge is placed in contact with the adjacent row so that one side of the edge does not overlap the row of optical fibers constituting the image fiber. The edge is fixed in contact with the incident end surface while maintaining this positional relationship, and then the mirror is removed and the edge is adjusted to hide a part of the optical fiber. A method for measuring light leakage of an image fiber, characterized in that illumination light is made incident on an incident end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57050033A JPS58167939A (en) | 1982-03-30 | 1982-03-30 | Leaking light measuring method of image fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57050033A JPS58167939A (en) | 1982-03-30 | 1982-03-30 | Leaking light measuring method of image fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58167939A JPS58167939A (en) | 1983-10-04 |
| JPH0226735B2 true JPH0226735B2 (en) | 1990-06-12 |
Family
ID=12847679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57050033A Granted JPS58167939A (en) | 1982-03-30 | 1982-03-30 | Leaking light measuring method of image fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58167939A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2518171B2 (en) * | 1985-07-16 | 1996-07-24 | 株式会社ニコン | Lighting fiber bundle inspection device |
| JPH0571661U (en) * | 1992-02-15 | 1993-09-28 | 純規 尾鳥 | Cigarette lighter |
-
1982
- 1982-03-30 JP JP57050033A patent/JPS58167939A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58167939A (en) | 1983-10-04 |
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