JPH0461011U - - Google Patents
Info
- Publication number
- JPH0461011U JPH0461011U JP10490390U JP10490390U JPH0461011U JP H0461011 U JPH0461011 U JP H0461011U JP 10490390 U JP10490390 U JP 10490390U JP 10490390 U JP10490390 U JP 10490390U JP H0461011 U JPH0461011 U JP H0461011U
- Authority
- JP
- Japan
- Prior art keywords
- modulation frequency
- optical fiber
- frequency signal
- measured
- path switching
- 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
- Length Measuring Devices By Optical Means (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
第１図は本願の考案の一実施例による光フアイ
バ長測定装置の構成を示すブロツク図、第２図は
実施例の位相計内部の主要な構成を示すブロツク
図、および第３図は第２図の各部の信号の波形を
示すタイミング図である。
なお、図面に用いた符号において、１０……被
測定光フアイバ、２０……発振器、２３……周波
数切換器、２５……発光ダイオード、３０……校
正用光フアイバ、４１……光路切換シヤツタ、５
３……光路切換シヤツタ、６０……受光素子、７
０……位相計、７１……マイクロプロセツサ、７
３……屈折率設定スイツチ、である。
FIG. 1 is a block diagram showing the configuration of an optical fiber length measuring device according to an embodiment of the invention of the present application, FIG. 2 is a block diagram showing the main configuration inside the phase meter of the embodiment, and FIG. FIG. 4 is a timing diagram showing waveforms of signals at each part in the figure. In addition, in the symbols used in the drawings, 10... optical fiber to be measured, 20... oscillator, 23... frequency switcher, 25... light emitting diode, 30... optical fiber for calibration, 41... optical path switching shutter, 5
3... Optical path switching shutter, 60... Light receiving element, 7
0...Phase meter, 71...Microprocessor, 7
3...Refractive index setting switch.
Claims (1)
変調周波数信号発生手段と、 前記変調周波数信号に応動して前記変調周波数
を有する光を発生する発光素子と、 前記発光素子と受光素子との間で被測定光フア
イバと並列に設けられた校正用の光伝送手段と、 前記発光素子からの光を前記被測定光フアイバ
を介して前記受光素子へ導くための第１のスイツ
チ位置と前記発光素子からの光を前記校正用光伝
送手段を介して前記受光素子へ導くための第２の
スイツチ位置とを有する光路切換手段と、 前記変調周波数信号と前記光路切換手段を前記
第１のスイツチ位置に切り換えたときに得られる
前記受光素子の出力信号と前記光路切換手段を前
記第２のスイツチ位置に切り換えたときに得られ
る前記受光素子の出力信号とに基づいて前記被測
定光フアイバの長さを割り出す演算手段と、 を具備したことを特徴とする光フアイバ長測定装
置。 (2) 前記変調周波数信号発生手段は変調周波数
の異なる第１および第２の変調周波数信号を選択
的に与えるように構成され、前記演算手段は前記
第１の変調周波数信号が選択されたときに得られ
る第１の測定値と前記第２の変調周波数信号が選
択されたときに得られる第２の測定値とに基づい
て前記被測定光フアイバの長さの測定値を決定す
るように構成されたことを特徴とする請求項１記
載の光フアイバ長測定装置。 (3) 前記演算手段は、前記被測定光フアイバの
屈折率にしたがつて前記被測定光フアイバの長さ
の測定値を補正するように構成されたことを特徴
とする請求項１または２記載の光フアイバ長測定
装置。[Claims for Utility Model Registration] (1) A modulation frequency signal generating means that generates a signal having a predetermined modulation frequency; a light emitting element that generates light having the modulation frequency in response to the modulation frequency signal; a calibration optical transmission means provided in parallel with the optical fiber to be measured between the light emitting element and the light receiving element; an optical path switching means having a first switch position and a second switch position for guiding light from the light emitting element to the light receiving element via the calibration optical transmission means; and the modulation frequency signal and the optical path switching means. based on the output signal of the light receiving element obtained when switching the optical path switching means to the second switch position and the output signal of the light receiving element obtained when switching the optical path switching means to the second switch position. An optical fiber length measuring device comprising: arithmetic means for determining the length of an optical fiber to be measured; (2) The modulation frequency signal generation means is configured to selectively provide first and second modulation frequency signals having different modulation frequencies, and the calculation means is configured to generate a first modulation frequency signal when the first modulation frequency signal is selected. configured to determine a length measurement of the optical fiber under test based on a first measurement obtained and a second measurement obtained when the second modulation frequency signal is selected; The optical fiber length measuring device according to claim 1, characterized in that: (3) The calculation means is configured to correct the measured value of the length of the optical fiber to be measured in accordance with the refractive index of the optical fiber to be measured. Optical fiber length measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10490390U JPH0461011U (en) | 1990-10-05 | 1990-10-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10490390U JPH0461011U (en) | 1990-10-05 | 1990-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0461011U true JPH0461011U (en) | 1992-05-26 |
Family
ID=31850358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10490390U Pending JPH0461011U (en) | 1990-10-05 | 1990-10-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0461011U (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5189453A (en) * | 1975-02-03 | 1976-08-05 | ||
| JPS5365750A (en) * | 1976-11-22 | 1978-06-12 | Nec Corp | Optical fiber length measuring device |
| JPS5525776A (en) * | 1978-08-14 | 1980-02-23 | Matsushita Electric Ind Co Ltd | Infrared ray radiation burner |
| JPS5837496A (en) * | 1981-08-31 | 1983-03-04 | Agency Of Ind Science & Technol | Transmitting device of boiling heat |
-
1990
- 1990-10-05 JP JP10490390U patent/JPH0461011U/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5189453A (en) * | 1975-02-03 | 1976-08-05 | ||
| JPS5365750A (en) * | 1976-11-22 | 1978-06-12 | Nec Corp | Optical fiber length measuring device |
| JPS5525776A (en) * | 1978-08-14 | 1980-02-23 | Matsushita Electric Ind Co Ltd | Infrared ray radiation burner |
| JPS5837496A (en) * | 1981-08-31 | 1983-03-04 | Agency Of Ind Science & Technol | Transmitting device of boiling heat |
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