A Study on Characteristics of Sagnac Interferometric Optical Fiber Sensor to Pulsed Ultrasonic Signal in Underwater

수중에서 펄스초음파 신호에 대한 Sagnac 간섭형 광섬유센서의 특성 연구

  • 이준호 (호서대 전기정보통신공학부) ;
  • 신대용 (호서대 전기정보통신공학부)
  • Published : 2004.01.01

Abstract

In this paper, we present the fabrication and characteristic analysis of Sagnac interferometric optical fiber senior(OFS) system for detecting pulsed ultrasonic signal in underwater. The hollow cylindrical mandrel wound round by single mode optical fiber is used as sensing component. The ultrasonic signal source is simulated by the PZT actuator operated by an function generator. The distance dependency of the OFS's sensitivity was measured. The sensitivity has been shown to be inversely propotional to the square-root of distance between ultrasonic source and sensing component. It has also been shown that the OFS could detect the signals less affected by ultrasonic path comparing to conventional acousto-electric sensor. and accurate location of ultrasonic signal could be carried out using two OFSs.

Keywords

Sagnac interferometer;optical fiber sensor(OFS);PZT;partial discharge(PD)

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