INTERFERENCE-TYPE OPTICAL FIBER SENSOR

PROBLEM TO BE SOLVED: To provide an interference-type optical fiber sensor which can reduce noise appearing in a demodulated output of a signal detected by a sensing fiber and can realize detection of a low-level signal.SOLUTION: The interference-type optical fiber sensor includes: a sensing interfe...

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1. Verfasser:	SATO RYOTAKU
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS TARIFF METERING APPARATUS TESTING
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an interference-type optical fiber sensor which can reduce noise appearing in a demodulated output of a signal detected by a sensing fiber and can realize detection of a low-level signal.SOLUTION: The interference-type optical fiber sensor includes: a sensing interferometer including a sensing fiber for detecting a physical amount and generating a propagation time difference in a propagation path for pulse light by the sensing fiber; and a delay compensation interferometer for compensating for the propagation time difference before and after the pulse light passes through the sensing interferometer.SELECTED DRAWING: Figure 1 【課題】センシングファイバで検出した信号の復調出力に現れる雑音を低減させ、レベルの低い信号の検出を実現する干渉型光ファイバセンサを提供すること。【解決手段】物理量を検知するセンシングファイバを含み、センシングファイバによってパルス光の伝搬経路に伝搬時間差を生じさせるセンシング干渉計と、パルス光がセンシング干渉計を通過する前とパルス光がセンシング干渉計を通過した後とのそれぞれにおいて、伝搬時間差を補償する遅延補償干渉計と、を有する干渉型光ファイバセンサ。【選択図】図１