JPH09119885A - Method for measuring thickness ununiformity of optical fiber - Google Patents
Method for measuring thickness ununiformity of optical fiberInfo
- Publication number
- JPH09119885A JPH09119885A JP27886195A JP27886195A JPH09119885A JP H09119885 A JPH09119885 A JP H09119885A JP 27886195 A JP27886195 A JP 27886195A JP 27886195 A JP27886195 A JP 27886195A JP H09119885 A JPH09119885 A JP H09119885A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- scattered light
- ratio
- measuring
- coating
- 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
Landscapes
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光ファイバ素線の
被覆の偏肉を測定する方法に関するもので、さらに詳し
くは、光ファイバ素線に光ビームを照射して得られる散
乱光パターンを用いて被覆の偏肉を測定する方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring uneven thickness of a coating of an optical fiber wire, and more specifically, it uses a scattered light pattern obtained by irradiating an optical fiber wire with a light beam. The present invention relates to a method for measuring uneven thickness of coating.
【０００２】[0002]
【従来の技術】光ファイバ素線の被覆の偏肉を測定する
方法として、光ファイバ素線の半径方向より光ビームを
照射してその散乱光パターンの左右対称性を基にして、
光ファイバ素線の偏芯、偏肉を求める方法が提案されて
いる。例えば、特公平２−５２２０７号公報には、光フ
ァイバに施した二層被覆のそれぞれの被覆に対する偏肉
を求めるために、前記二層被覆を施した光ファイバ素線
に直線性の優れた光ビームをＸ、Ｙの２方向より照射し
て、散乱光の特徴的なピークが現われる位置の左右の比
（以下単に散乱光位置の比という）：Ｓと受光器で検出
した前記ピークの強度の左右の比（以下単に散乱光強度
の比という）：Ｐより各被覆の偏肉を求める方法が開示
されている。2. Description of the Related Art As a method for measuring the uneven thickness of the coating of an optical fiber wire, a light beam is irradiated from the radial direction of the optical fiber wire and based on the left-right symmetry of the scattered light pattern,
A method for determining the eccentricity and thickness deviation of an optical fiber strand has been proposed. For example, in Japanese Examined Patent Publication No. 2-52207, in order to obtain the uneven thickness of the two-layer coating applied to the optical fiber with respect to each coating, the optical fiber element wire coated with the two-layer coating has excellent linearity. When the beam is irradiated in two directions, X and Y, the ratio of the left and right of the position where the characteristic peak of the scattered light appears (hereinafter simply referred to as the ratio of the scattered light position): S and the intensity of the peak detected by the light receiver. A method of obtaining the uneven thickness of each coating from the ratio of right and left (hereinafter simply referred to as the ratio of scattered light intensity): P is disclosed.
【０００３】また、特開昭６１−４４３３６号公報に
は、光ファイバに被覆を施した光ファイバ素線にその半
径方向より光ビームをＸ、Ｙの２方向から照射し、その
散乱光と入射光をダイオードアレイにて測定し、入射光
と散乱光の共に入射する領域（第２領域）と散乱光のみ
入射する領域（第１領域）とに分割する。次いでそれぞ
れのパルス波形信号の第１領域の立ち上がりおよび立ち
下がり位置と第２領域の立ち下がりおよび立上がり位置
とから、左右の偏肉あるいは偏芯を求める方法が開示さ
れている。Further, in Japanese Patent Application Laid-Open No. 61-44336, an optical fiber coated with an optical fiber is irradiated with a light beam in the X and Y directions from the radial direction, and the scattered light and the incident light are incident. The light is measured by a diode array and divided into a region (second region) where both incident light and scattered light are incident and a region (first region) where only scattered light is incident. Then, there is disclosed a method for obtaining the lateral eccentricity or eccentricity from the rising and falling positions of the first region and the falling and rising positions of the second region of each pulse waveform signal.
【０００４】[0004]
【発明が解決しようとする課題】上記２つの例では、Ｘ
およびＹの２方向から光ビームを照射して偏肉あるいは
偏芯を測定をするが、偏芯の位置と入射するＸ、Ｙ方向
の光ビームとの位置により偏肉あるいは偏芯が測定でき
なくなる場合がある。例えば図６に示すように光ビーム
の透過光側より偏芯角θE をとるとすると、θE ≦１５
°、偏芯量ｄがｄ＝１〜５μｍでは特徴ある散乱光のパ
ターンは測定されない。一方その光ビームと直角方向の
光ビームでは特徴ある散乱光のパターンがはっきりと測
定できる。しかし、偏芯角θE と偏芯量ｄの２つの未知
数に対して、１つの物理量しか正確に求まらないので、
正確な偏芯量ｄが求まらないという問題があった。ま
た、Ｘ、Ｙの２方向の測定結果より偏芯量ｄを求めるの
で、偏芯の位置によりＸ、Ｙの２方向の測定精度が変化
するので誤差が生じ易いという問題があった。In the above two examples, X
The eccentricity or eccentricity cannot be measured depending on the position of the eccentricity and the incident light beam in the X and Y directions. There are cases. For example, as shown in FIG. 6, if the eccentricity angle θE is taken from the transmitted light side of the light beam, then θE ≤15
When the eccentricity d is d = 1 to 5 μm, a characteristic scattered light pattern is not measured. On the other hand, the characteristic scattered light pattern can be clearly measured in the light beam in the direction perpendicular to the light beam. However, since only one physical quantity can be accurately obtained for two unknowns of the eccentricity angle θE and the eccentricity d,
There is a problem that an accurate eccentricity amount d cannot be obtained. In addition, since the eccentricity amount d is obtained from the measurement results in the two directions of X and Y, there is a problem that an error easily occurs because the measurement accuracy in the two directions of X and Y changes depending on the position of the eccentricity.
【０００５】本発明は上記の課題を解決し、偏芯の位置
に関係なく極力誤差を小さくして偏芯角と偏芯量を精度
よく求めることができる光ファイバ素線の偏肉測定方法
を提供することを目的とするものである。The present invention solves the above-mentioned problems and provides a method for measuring the eccentricity of an optical fiber wire which can accurately obtain the eccentricity angle and the eccentricity by minimizing the error regardless of the position of the eccentricity. It is intended to be provided.
【０００６】[0006]
【課題を解決するための手段】本発明は上記の課題を解
決するために以下のような手段を有している。The present invention has the following means to solve the above problems.
【０００７】本発明の請求項１の光ファイバ素線の偏肉
測定方法は、少なくとも一層以上の被覆を有した光ファ
イバ素線に対して、前記被覆を透過する光を前記光ファ
イバ素線の長手方向に対して直角方向の半径方向より入
射して、その前方散乱光を検出して前記被覆の偏肉を測
定する光ファイバ素線の偏肉測定方法において、少なく
とも一対の前記被覆を透過する光の入射光源と前記前方
散乱光を検出する検出器を同期させて前記光ファイバ素
線に対して相対的に回転させて前記散乱光の特徴ある散
乱光位置の比および散乱光強度の比を測定して、前記被
覆の偏肉を求めることを特徴とする。According to a first aspect of the present invention, there is provided an optical fiber strand thickness unevenness measuring method, wherein light transmitted through the coating is applied to an optical fiber strand having at least one coating layer. In an uneven thickness measuring method for an optical fiber element, which is incident from a radial direction perpendicular to the longitudinal direction, detects forward scattered light to measure uneven thickness of the coating, and transmits at least a pair of the coatings. The ratio of the scattered light position and the ratio of the scattered light intensity, which are characteristic of the scattered light, are synchronized by synchronizing the light incident light source and the detector for detecting the forward scattered light and rotating them relative to the optical fiber strand. It is characterized in that the uneven thickness of the coating is obtained by measurement.
【０００８】本発明の請求項２の光ファイバ素線の偏肉
測定方法は、一対の入射光源と検出器を光ファイバ素線
の長手方向の軸を中心にして３６０°回転させることを
特徴とする。According to a second aspect of the present invention, there is provided a method for measuring thickness deviation of an optical fiber wire, wherein a pair of an incident light source and a detector are rotated by 360 ° about a longitudinal axis of the optical fiber wire. To do.
【０００９】本発明の請求項３の光ファイバ素線の偏肉
測定方法は、二対の入射光源と検出器をそれぞれ互いに
１８０°ずらせて配置して光ファイバ素線の長手方向の
軸を中心にして１８０°回転させることを特徴とする。According to a third aspect of the present invention, there is provided a method for measuring an uneven thickness of an optical fiber strand, wherein two pairs of incident light sources and detectors are arranged so as to be offset from each other by 180 ° and the longitudinal axis of the optical fiber strand is centered. And is rotated by 180 °.
【００１０】本発明の請求項４の光ファイバ素線の偏肉
測定方法は、少なくとも一対の入射光源と検出器に対し
て光ファイバ素線自身を回転させることを特徴とする。According to a fourth aspect of the present invention, the method for measuring the thickness deviation of the optical fiber strand is characterized in that the optical fiber strand itself is rotated with respect to at least a pair of an incident light source and a detector.
【００１１】本発明の光ファイバ素線の偏肉測定方法に
よれば、少なくとも一対の入射光源と前方散乱光を検出
する検出器もしくは測定すべき光ファイバ素線を回転さ
せて、それぞれの角度での散乱光位置の比Ｓおよび散乱
光強度の比Ｐを求める。例えば、一回転させながら散乱
光位置の比Ｓおよび散乱光強度の比Ｐを求めると、偏芯
の最も大きな所の散乱光のデータ、すなわち、散乱光位
置の比Ｓおよび散乱光強度の比Ｐのピークが得られる。
このピークの位置での散乱光位置の比Ｓおよび散乱光強
度の比Ｐを基にして、予め測定してある散乱光位置の比
Ｓおよび散乱光強度の比Ｐと偏肉量の関係式より偏芯量
を求めることができる。相対的に入射光源検出器及び光
ファイバを回転させる場合、散乱光位置の比Ｓおよび散
乱光強度の比Ｐのピークの位置は、散乱角に対して入射
光源が垂直に当たる位置であり最も測定しやすい位置で
あるから、測定精度も高く偏芯角と偏芯量を誤差なく精
度よく求めることができる。According to the method of measuring the thickness deviation of the optical fiber strand of the present invention, at least a pair of the incident light source and the detector for detecting the forward scattered light or the optical fiber strand to be measured is rotated and is rotated at each angle. The ratio S of scattered light positions and the ratio P of scattered light intensities are calculated. For example, when the ratio S of the scattered light position and the ratio P of the scattered light intensity are obtained while rotating once, the data of the scattered light at the largest eccentricity, that is, the ratio S of the scattered light position and the ratio P of the scattered light intensity are obtained. The peak of is obtained.
Based on the ratio S of the scattered light position and the ratio P of the scattered light intensity at the position of this peak, from the relational expression of the ratio S of the scattered light position and the ratio P of the scattered light intensity and the amount of uneven thickness measured in advance. The amount of eccentricity can be calculated. When the incident light source detector and the optical fiber are relatively rotated, the peak position of the ratio S of scattered light position and the ratio P of scattered light intensity is the position where the incident light source is perpendicular to the scattering angle, and is most measured. Since the position is easy, the measurement accuracy is high, and the eccentricity angle and the eccentricity can be accurately obtained without error.
【００１２】[0012]
【発明の実施の形態】以下に本発明の実施の形態につい
て図面を参照してより詳細に説明する。図１は、本発明
の光ファイバ素線の偏肉測定方法の一実施例に使用され
る偏肉測定部の一例を示す断面図である。１は、偏肉を
測定すべき光ファイバ素線である。１０は、光ファイバ
素線１の偏肉を測定する偏肉測定部である。偏肉測定部
１０は、一対の光ビームを照射するレーザ光源１１とダ
イオードアレイからなる光検出器１２を有している。レ
ーザ光源１１と光検出器１２は、光ファイバ素線１の長
手方向に対して直角方向の半径方向に光ファイバ素線１
を挟んで三者が一直線に配置されて回転ステージ１３に
載置されている。回転ステージ１３はその中央に光ファ
イバ素線１を挿通させる貫通孔１４を有した測定基台１
５上にコロ１６およびベアリング１７を介して回転可能
に載置されている。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a thickness deviation measuring unit used in an embodiment of the thickness deviation measuring method for an optical fiber according to the present invention. Reference numeral 1 is an optical fiber element wire whose uneven thickness is to be measured. Reference numeral 10 denotes an uneven thickness measuring unit that measures the uneven thickness of the optical fiber element wire 1. The thickness deviation measuring unit 10 includes a laser light source 11 that irradiates a pair of light beams and a photodetector 12 including a diode array. The laser light source 11 and the photodetector 12 are arranged in the optical fiber strand 1 in the radial direction perpendicular to the longitudinal direction of the optical fiber strand 1.
The three members are arranged in a straight line across the and are placed on the rotary stage 13. The rotary stage 13 has a through hole 14 at the center thereof for allowing the optical fiber element wire 1 to pass therethrough.
5 is rotatably mounted on the roller 5 via a roller 16 and a bearing 17.
【００１３】回転ステージ１３の外周には歯車１８が設
けられスッテピングモータ１９の回転軸に設けられた歯
車２０と嵌合していて、スッテピングモータ１９の駆動
により回転ステージ１３が所定の角度、例えば１°づつ
回転するようになっている。スッテピングモータ１９に
は、エンコーダ２１が取り付けられていてスッテピング
モータ１９の回転角を検出して、回転ステージ１３の回
転角を検出するようになっている。回転ステージ１３の
上部には、光検出器１２に余分な外乱光が入らないよう
に光ファイバ素線１を挿通させる貫通孔を有したカバー
２２が設けられている。A gear 18 is provided on the outer periphery of the rotary stage 13 and is fitted with a gear 20 provided on the rotary shaft of the stepping motor 19, and the rotary stage 13 is driven by the stepping motor 19 to rotate at a predetermined angle. For example, it is designed to rotate by 1 °. An encoder 21 is attached to the stepping motor 19 to detect the rotation angle of the stepping motor 19 to detect the rotation angle of the rotary stage 13. A cover 22 having a through hole through which the optical fiber element wire 1 is inserted so as to prevent excess ambient light from entering the photodetector 12 is provided above the rotary stage 13.
【００１４】上記のような構成の偏肉測定部１０で線引
き中の光ファイバ素線１の偏肉を測定する方法について
以下に説明する。線引中の光ファイバ素線１を偏肉測定
部１０にセットした状態で、レーザ光源１１と光検出器
１２の光軸をあわせてセットし、レーザ光源１１より光
ビームを照射した状態で光ファイバ素線１を中心にして
スッテピングモータ１９の駆動により回転ステージ１３
が所定の角度、例えば１°づつ回転させながら光ファイ
バ素線１を透過した前方散乱光を光検出器１２で測定し
ながら一回転させて、それぞれの角度における前方散乱
光の図２（イ）、（ロ）に示すようなパターンの左右の
散乱光位置の比Ｓと散乱光強度の比Ｐを求める。左右の
散乱光位置の比Ｓと散乱光強度の比Ｐは図３（イ）、
（ロ）に示すように特定の位置θ1 でピークを持ち、こ
のピークの位置は偏芯角からほぼ９０°傾いた角度とな
る。A method for measuring the thickness deviation of the optical fiber element wire 1 being drawn by the thickness deviation measuring unit 10 having the above-described structure will be described below. With the optical fiber strand 1 being drawn set in the thickness deviation measuring unit 10, the optical axes of the laser light source 11 and the photodetector 12 are set together, and light is emitted from the laser light source 11 in the state of being irradiated with a light beam. The rotation stage 13 is driven by driving the stepping motor 19 around the fiber strand 1.
Is rotated by a predetermined angle, for example, 1 ° while rotating forward scattered light transmitted through the optical fiber element wire 1 by the photodetector 12, and is rotated once, and the forward scattered light at each angle is shown in FIG. , (B), the ratio S of the scattered light positions on the left and right of the pattern and the ratio P of the scattered light intensity are obtained. The ratio S of the scattered light positions on the left and right and the ratio P of the scattered light intensity are shown in FIG.
As shown in (b), it has a peak at a specific position θ 1 , and the position of this peak is an angle inclined by approximately 90 ° from the eccentric angle.
【００１５】上記の散乱光位置の比Ｓと散乱光強度の比
Ｐの値より偏芯量を求めるには通常以下のようにしてい
る。すなわち、散乱光位置の比Ｓと散乱光強度の比Ｐと
偏芯量の関係が予め既知である光ファイバ素線を用いて
図４に示すように測定して換算表を作成しておき、その
換算表に基づいて散乱光位置の比Ｓと散乱光強度の比Ｐ
の値より偏芯量を求めるのである。このようにレーザ光
源と光検出器を一体として回転させ測定することによ
り、散乱光の角度方向での特徴的なピークが求まり、そ
れより偏芯量が求まる。このピークの位置は最も測定し
やすい位置なので、測定精度も高く偏肉の既知のサンプ
ル結果と直接比較できることにより測定誤差が入らな
い。本実施例の測定方法は、２方向より測定していた従
来の偏肉測定方法のすべての偏肉測定方法について適応
することができる。In order to obtain the eccentricity amount from the value of the ratio S of the scattered light position and the ratio P of the scattered light intensity, the following is usually done. That is, the conversion table is prepared by measuring as shown in FIG. 4 using an optical fiber element wire in which the relationship between the ratio S of scattered light position, the ratio P of scattered light intensity, and the amount of eccentricity is known in advance. Based on the conversion table, the ratio S of scattered light position and the ratio P of scattered light intensity
The amount of eccentricity is obtained from the value of. By thus rotating and measuring the laser light source and the photodetector integrally, the characteristic peak of the scattered light in the angular direction is obtained, and the eccentricity amount is obtained from it. Since the position of this peak is the position where the measurement is most easy, the measurement accuracy is high and the measurement result can be directly compared with the known sample result of uneven thickness, so that the measurement error is not included. The measuring method of the present embodiment can be applied to all the uneven thickness measuring methods of the conventional uneven thickness measuring method which are measured in two directions.
【００１６】また、上記実施例では、散乱光位置の比Ｓ
と散乱光強度の比Ｐを用いたが、一層のみの被覆の場合
には、別の手段で偏芯角を求めることができるので、散
乱光位置の比Ｓだけ測定すればよい。また、一層のみの
被覆の場合には、多少精度は落ちるものの片側のピーク
についてのみ散乱光位置及び散乱光強度を測定してもよ
い。このようにすると、受光部のフォトダイオードアレ
イを小さくすること、あるいはフォトダイオードと光フ
ァイバとの距離を離すことができる。In the above embodiment, the ratio S of the scattered light positions is
Although the ratio P of the scattered light intensity was used, the eccentric angle can be obtained by another means in the case of coating only one layer, and therefore only the ratio S of the scattered light positions needs to be measured. Further, in the case of coating only one layer, the scattered light position and the scattered light intensity may be measured only for the peak on one side, although the accuracy is somewhat lowered. By doing so, the photodiode array of the light receiving portion can be made smaller, or the distance between the photodiode and the optical fiber can be increased.
【００１７】上記実施例において、一対のレーザ光源１
１と光検出器１２を用いて光ファイバ素線１の偏肉を測
定したが、レーザ光源１１と光検出器１２を２対用いて
それぞれを１８０°ずらして配置した状態で光ファイバ
素線の偏肉を測定することもできる。２対のレーザ光源
と光検出器を用いてそれぞれを１８０°ずらして配置し
た状態で光ファイバ素線の偏肉を測定する場合は、レー
ザ光源と光検出器を１８０°回転するだけで光ファイバ
素線の全周を測定できるので測定時間を半分にすること
ができる。In the above embodiment, a pair of laser light sources 1
1 and the photodetector 12 were used to measure the eccentricity of the optical fiber strand 1, but two pairs of the laser light source 11 and the photodetector 12 were used, and the optical fiber strand was placed 180 degrees apart from each other. Uneven thickness can also be measured. When measuring the thickness deviation of the optical fiber strand with two pairs of laser light source and photodetector shifted by 180 °, simply rotate the laser light source and photodetector by 180 °. Since the entire circumference of the wire can be measured, the measurement time can be halved.
【００１８】また、上記実施例において、散乱光位置の
比Ｓと散乱光強度の比Ｐと偏芯量の関係を予め既知の光
ファイバ素線を用いて測定して作成した換算表を用いた
が、換算表は散乱光の理論計算より求めたものを用いて
もよい。理論計算により求める場合は、被覆の変化等に
ついて多くのサンプルの実験をしなくても較正データが
求められ便利である。さらに、上記実施例では被覆が一
層の場合について説明したが、二層被覆の偏肉を測定す
る場合には、内層と外層に起因する散乱光位置の比Ｓと
散乱光強度の比Ｐが各々２つ求まるので、それぞれにつ
いて偏芯量を求め、内層、外層の偏芯量より偏肉を求め
ることができる。Further, in the above embodiment, a conversion table prepared by measuring the relationship between the ratio S of scattered light position, the ratio P of scattered light intensity and the amount of eccentricity by using a known optical fiber element wire in advance was used. However, the conversion table may be obtained by theoretical calculation of scattered light. The theoretical calculation is convenient because calibration data can be obtained without experimenting with many samples for changes in the coating. Further, in the above embodiment, the case where the coating is one layer has been described. However, when measuring the uneven thickness of the two-layer coating, the ratio S of the scattered light positions due to the inner layer and the outer layer and the ratio P of the scattered light intensity are respectively Since two are obtained, the eccentricity amount can be obtained for each, and the eccentricity can be obtained from the eccentricity amounts of the inner layer and the outer layer.
【００１９】上記実施例の光ファイバ素線の偏肉測定方
法は、線引中の光ファイバ素線の偏肉をオンラインで測
定する場合について説明したが、オフラインで光ファイ
バ素線の偏肉を測定する場合は、図５（イ）、（ロ）に
示す装置を使用して測定するすることができる。図５に
おいて、６０は偏肉測定部、６１はレーザ光源、６２は
光検出器であり、それぞれ図１に示したレーザ光源１１
と光検出器１２と同様のものである。Although the method of measuring the thickness deviation of the optical fiber strand in the above-described embodiment has been described by measuring the thickness deviation of the optical fiber strand being drawn online, the thickness deviation of the optical fiber strand can be measured offline. In the case of measuring, it can be measured using the device shown in FIGS. In FIG. 5, reference numeral 60 is a thickness deviation measuring unit, 61 is a laser light source, and 62 is a photodetector. The laser light source 11 shown in FIG.
And the same as the photodetector 12.
【００２０】レーザ光源６１と光検出器６２は、光ファ
イバ素線１の長手方向に対して直角方向の半径方向に光
ファイバ素線１を挟んで三者が一直線に配置されてステ
ージ６３に載置されている。６４Ａ、６４Ｂは光ファイ
バ素線１を所定の位置にセットする光ファイバ素線１の
長手方向にＶ溝を有するガイドである。６５は、光ファ
イバ素線１の端末を固着する回転ホルダで、この回転ホ
ルダ６５は、スッテピングモータ６６の回転軸に連結さ
れていてスッテピングモータ６６の駆動により所定の角
度、例えば１°づつ回転するようになっている。スッテ
ピングモータ６６には、エンコーダ６７が取り付けられ
ていてスッテピングモータ６６の回転角を検出して、回
転ホルダ６５に固着された光ファイバ素線１の回転角を
検出するようになっている。６７は制御部である。制御
部６７は、エンコーダ６７の出力、光検出器６２の出力
等が入力され、またスッテピングモータ６６の回転の制
御等が行われる。The laser light source 61 and the photodetector 62 are mounted on the stage 63 so that the three members are arranged in a straight line with the optical fiber strand 1 sandwiched in the radial direction perpendicular to the longitudinal direction of the optical fiber strand 1. It is placed. 64A and 64B are guides having a V groove in the longitudinal direction of the optical fiber strand 1 for setting the optical fiber strand 1 at a predetermined position. Reference numeral 65 is a rotary holder for fixing the end of the optical fiber element wire 1. The rotary holder 65 is connected to the rotary shaft of the stepping motor 66 and is driven by the stepping motor 66 to move at a predetermined angle, for example, 1 °. It is designed to rotate. An encoder 67 is attached to the stepping motor 66 to detect the rotation angle of the stepping motor 66 and to detect the rotation angle of the optical fiber element wire 1 fixed to the rotation holder 65. 67 is a control unit. The control unit 67 receives the output of the encoder 67, the output of the photodetector 62, etc., and controls the rotation of the stepping motor 66, etc.
【００２１】上記のように構成された装置で光ファイバ
素線の偏肉を測定する方法について説明する。線引きさ
れた光ファイバ素線１の端末を所定長さ例えば２０ｃｍ
程度切断して、切断された光ファイバ素線１をガイド６
４Ａ、６４Ｂ上にセットしてその一方の端部を回転ホル
ダ６５に設けられた光ファイバ素線装着孔６５Ａに装着
して、光ファイバ素線１を偏肉測定部６０にセットす
る。A method of measuring the uneven thickness of the optical fiber element wire with the apparatus configured as described above will be described. The end of the drawn optical fiber element wire 1 has a predetermined length, for example, 20 cm.
Cut the optical fiber element wire 1 that has been cut to about 6
4A and 64B, one end thereof is mounted in the optical fiber strand mounting hole 65A provided in the rotary holder 65, and the optical fiber strand 1 is set in the thickness deviation measuring unit 60.
【００２２】さらに、レーザ光源６１と光検出器６２の
光軸をあわせてセットし、レーザ光源６１より光ビーム
を照射した状態で光ファイバ素線１をスッテピングモー
タ６６の駆動により所定の角度、例えば１°づつ回転さ
せながら光ファイバ素線１を透過した前方散乱光を光検
出器６２で測定しながら一回転させて、それぞれの角度
における前方散乱光の図２に示すようなパターンの左右
の散乱光位置の比Ｓと散乱光強度の比Ｐを求める。散乱
光位置の比Ｓと散乱光強度の比Ｐより光ファイバ素線１
の偏肉を求めることは、上述の実施例と同様につき詳細
な説明は省略する。Further, the optical axes of the laser light source 61 and the photodetector 62 are set so as to match each other, and the optical fiber element wire 1 is driven by the stepping motor 66 at a predetermined angle while being irradiated with a light beam from the laser light source 61. For example, the forward scattered light transmitted through the optical fiber element 1 is rotated by 1 ° and is rotated once while being measured by the photodetector 62. The ratio S of the scattered light position and the ratio P of the scattered light intensity are obtained. From the ratio S of the scattered light position and the ratio P of the scattered light intensity, the optical fiber strand 1
The determination of the uneven thickness is similar to that of the above-described embodiment, and detailed description thereof will be omitted.
【００２３】[0023]
【発明の効果】以上述べたように、本発明の光ファイバ
素線の偏肉測定方法によれば、少なくとも一対の入射光
源と前方散乱光を検出する検出器もしくは測定すべき光
ファイバ素線を回転させて、それぞれの角度での散乱光
位置の比Ｓおよび散乱光強度の比Ｐを求めるので、容易
に散乱光位置の比Ｓおよび散乱光強度の比Ｐのピークが
得られる。散乱光位置の比Ｓおよび散乱光強度の比Ｐの
ピークの位置は、散乱光が入射光源に対し垂直となる位
置であり最も測定しやすい位置であるから、測定精度も
高く偏芯角と偏芯量を誤差なく精度よく求めることがで
きる。また、この位置での散乱光位置の比Ｓおよび散乱
光強度の比Ｐを基にして、予め測定してある散乱角の比
Ｓおよび強度の比Ｐと偏肉量の関係式より偏芯量を誤差
なく精度よく求めることができる。As described above, according to the method for measuring the thickness deviation of the optical fiber strand of the present invention, at least a pair of the incident light source and the detector for detecting the forward scattered light or the optical fiber strand to be measured is used. Since the ratio S of the scattered light position and the ratio P of the scattered light intensity at each angle are obtained by rotating, the peaks of the ratio S of the scattered light position and the ratio P of the scattered light intensity can be easily obtained. The position of the peak of the ratio S of the scattered light position and the ratio P of the scattered light intensity is the position where the scattered light is perpendicular to the incident light source and is the position where the measurement is most easy. The core amount can be accurately obtained without error. Further, based on the ratio S of the scattered light position and the ratio P of the scattered light intensity at this position, the eccentricity amount is calculated from the relational expression of the ratio S of the scattering angle and the ratio P of the intensity and the amount of uneven thickness measured in advance. Can be accurately determined without error.
【図１】本発明の光ファイバ素線の偏肉測定方法の一実
施例に使用する装置の一例を示す断面図である。FIG. 1 is a cross-sectional view showing an example of an apparatus used in an embodiment of the method for measuring the thickness deviation of an optical fiber strand according to the present invention.
【図２】図１の装置で光ファイバ素線の散乱光位置の比
Ｓおよび散乱光強度の比Ｐを測定した結果を示す説明図
である。FIG. 2 is an explanatory diagram showing a result of measuring a ratio S of scattered light positions and a ratio P of scattered light intensities of optical fiber strands by the apparatus of FIG.
【図３】図２の散乱光位置の比Ｓおよび散乱光強度の比
Ｐの主要部を示す説明図である。FIG. 3 is an explanatory diagram showing main parts of a ratio S of scattered light positions and a ratio P of scattered light intensities in FIG.
【図４】散乱光位置の比Ｓおよび散乱光強度の比Ｐと偏
肉量の関係を示す説明図である。FIG. 4 is an explanatory diagram showing a relationship between a ratio S of scattered light positions and a ratio P of scattered light intensities and an amount of uneven thickness.
【図５】本発明の光ファイバ素線の偏肉測定方法の他の
実施例に使用する装置の一例を示す断面図である。FIG. 5 is a cross-sectional view showing an example of an apparatus used in another embodiment of the method for measuring the thickness deviation of the optical fiber wire according to the present invention.
【図６】入射光と偏芯角、偏芯量の関係を示す説明図で
ある。FIG. 6 is an explanatory diagram showing a relationship among incident light, an eccentric angle, and an eccentric amount.
１ 光ファイバ素線 １０ 偏肉測定部 １１ レーザ光源 １２ 光検出器 １３ 回転ステージ １９ ステッピングモータ ６０ 偏肉測定部 ６１ レーザ光源 ６２ 光検出器 ６６ ステッピングモータ Ｓ 散乱光位置の比 Ｐ 散乱光強度の比 DESCRIPTION OF SYMBOLS 1 Optical fiber wire 10 Deflection measuring part 11 Laser light source 12 Photodetector 13 Rotating stage 19 Stepping motor 60 Stepping motor 60 Deflection measuring part 61 Laser light source 62 Photodetector 66 Stepping motor S Ratio of scattered light position P Ratio of scattered light intensity
Claims (4)
ァイバ素線に対して、前記被覆を透過する光を前記光フ
ァイバ素線の長手方向に対して直角方向の半径方向より
入射して、その前方散乱光を検出して前記被覆の偏肉を
測定する光ファイバ素線の偏肉測定方法において、少な
くとも一対の前記被覆を透過する光の入射光源と前記前
方散乱光を検出する検出器を同期させて前記光ファイバ
素線に対して相対的に回転させて前記散乱光の特徴ある
散乱光位置および散乱光強度を測定して、前記被覆の偏
肉を求めることを特徴とする光ファイバ素線の偏肉測定
方法。1. An optical fiber element wire having at least one or more coatings is irradiated with light transmitted through the coating material in a radial direction perpendicular to a longitudinal direction of the optical fiber element wire, In an optical fiber strand thickness unevenness measuring method for detecting forward scattering light to measure the thickness unevenness of the coating, an incident light source of light transmitted through at least a pair of the coating and a detector detecting the forward scattering light are synchronized. The optical fiber element wire is characterized in that it is rotated relative to the optical fiber element wire to measure a characteristic scattered light position and scattered light intensity of the scattered light to obtain the uneven thickness of the coating. Of uneven thickness.
線の長手方向の軸を中心にして３６０°回転させること
を特徴とする請求項１記載の光ファイバ素線の偏肉測定
方法。2. The method for measuring thickness deviation of an optical fiber wire according to claim 1, wherein the pair of the incident light source and the detector are rotated by 360 ° about the longitudinal axis of the optical fiber wire.
に１８０°ずらせて配置して光ファイバ素線の長手方向
の軸を中心にして１８０°回転させることを特徴とする
請求項１記載の光ファイバ素線の偏肉測定方法。3. The pair of incident light sources and detectors are arranged so as to be offset from each other by 180 ° and rotated by 180 ° about the longitudinal axis of the optical fiber strand. Method for measuring thickness deviation of optical fiber strands.
して光ファイバ素線自身を回転させることを特徴とする
請求項１記載の光ファイバ素線の偏肉測定方法。4. The method for measuring thickness deviation of an optical fiber wire according to claim 1, wherein the optical fiber wire itself is rotated with respect to at least a pair of an incident light source and a detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27886195A JPH09119885A (en) | 1995-10-26 | 1995-10-26 | Method for measuring thickness ununiformity of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27886195A JPH09119885A (en) | 1995-10-26 | 1995-10-26 | Method for measuring thickness ununiformity of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09119885A true JPH09119885A (en) | 1997-05-06 |
Family
ID=17603158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27886195A Pending JPH09119885A (en) | 1995-10-26 | 1995-10-26 | Method for measuring thickness ununiformity of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09119885A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003515143A (en) * | 1999-11-17 | 2003-04-22 | コーニング インコーポレイテッド | Method and apparatus for automation of optical fiber test and measurement |
-
1995
- 1995-10-26 JP JP27886195A patent/JPH09119885A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003515143A (en) * | 1999-11-17 | 2003-04-22 | コーニング インコーポレイテッド | Method and apparatus for automation of optical fiber test and measurement |
| JP4759196B2 (en) * | 1999-11-17 | 2011-08-31 | コーニング インコーポレイテッド | Method and apparatus for automated testing and measurement of optical fibers |
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