광섬유 EFPI 센서를 이용한 실시간 고정밀 변위 측정 Real-time Measurement of Precision Displacement using Fiber Optic EFPI Sensor

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Precision displacement of less than a few nm resolution was measured in real-time using fiber optic EFPI sensor. The novel method for real-time processing of analyzing EFPI output signal was developed and verified. Linearity in the mean values of interferometric light intensity among adjacent fringes was shown, and the sinusoidal approximation algorithm that estimates past and coming fringe values was verified through the linearity. Real-time signal processing program was developed, and the intensity signal of the EFPI sensor was transformed to the phase shift with this program. The resolution below 0.4 ~ 10 nm in the displacement range of was obtained by reducing the photodetector noise using low-pass filter and signal averaging. The nano-translation stage with a Piezo-electric actuator and the EFPI sensor system was designed and tested. This stage successfully reached to the desired destination in range within 1 nm accuracy.
Publisher
한국복합재료학회
Issue Date
2003-10-17
Language
KOR
Citation

한국복합재료학회 2003년도 추계학술발표대회, pp.154 - 157

URI
http://hdl.handle.net/10203/10458
Appears in Collection
AE-Conference Papers(학술회의논문)
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