Journal of the Korean Institute of Telematics and Electronics D (전자공학회논문지D)
- Volume 34D Issue 3
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- Pages.105-113
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- 1997
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- 1226-5845(pISSN)
Fiber Bragg grating sensor using a Mach-Zehnder interferometer
Mach-Zehnder 간섭계를 이용한 광섬유 브래그 격자 센서
Abstract
We constructed a very accurate fiber bragg grating sensor system using an unbalanced mach-zehnder interferometer which converts the measurand-induced bragg wavelength shift to phase change of th einterference signal. With a shielded reference grating, output phase drift which orginates from the thermal drift on the interferometer was compensated. Mesured accuracy of the constructed system was 0.03 .deg. C and 0.26.mu. strain for temperature and strain measuremtn, respectively. It is over 300 times better resolution compared to the conventional optical spectrum analyzer which has 0.1nm wavelength resolution capability.
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