Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2002.07c
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- Pages.1936-1938
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- 2002
Fiber Laser based Fiber Bragg Grating Strain Sensor
광섬유 레이저를 이용한 광섬유격자 스트레인 센서
- Kim, Jong-Seop (Chonbuk National University) ;
- Park, Hyoung-Jun (Chonbuk National University) ;
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Song, Min-Ho
(Chonbuk National University)
- Published : 2002.07.10
Abstract
A tunable fiber laser and the Quadrature Sampling technique are used to construct highly sensitive fiber-optic distributive Bragg grating strain sensor system. By using a wavelength-modulated fiber laser, the variations of strain-dependent Bragg wavelengths are transformed into the variations of time-domain reflection profiles. The locations of profile peaks that correspond to the applied strains are demodulated using a precise wavelength encoder that uses a fiber-optic Mach-Zehnder interferometer and Quadrature Sampling technique. With the extremely high sensitive optical encoder, we could obtain not only high sensitivity, but also very linear responses that was impossible with the conventional techniques. This paper is attempted to report the theoretical and experimental results.
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