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오승필,김도익,예윤해,-- 경희대학교 레이저공학연구소 2001 레이저공학 Vol.12 No.-
We propose a signal processing method for white light interferometry which requires a series of analog signal processing circuitry to locate the central interference fringe with high speed. The method is applied to a fiber optic sensor consisted of an ELED, a sensing Fabry-Perot interferometer, and a Michelson interferometer for phase-matching and phase modulation. The temporal shift of sensor response is measured by the shift of the central fringe position. The test results show that the WLI sensor system is able to differentiate the change of 0.02℃ when it is implemented as a temperature sensor.