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변형 램프변조를 이용한 간섭 센서의 신호처리

Signal processing of interferometric sensor using modified ramp modulation

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주제분류공학일반

초록

Abstract

A high-speed signal processor for Fabry-Perot interferometric sensors using modified ramp modulation is implemented.The main idea for the signal processing is to find a modulation waveform that could induce a linear frequency change ina laser diode to linearize the relationship between the optical phase shift and measurand. It is found that the waveform couldbe modeled as the addition of a linear term and an exponential term. A signal processor adopting modified ramp modulationtechnique is implemented and evaluated to find linearity, drift and random walk of <±1.5 %, 0.4oC, 5.28×104 oC/ .

참고문헌 (6)

  1. "“Measurement of small phase shifts using a singlemode optical-fiber interferometer”", pp.139~141 (1980)
  2. "“Side polished fiber optic UV sensor using evanescent coupling of photo-functional polymer”", 11(6), pp.335~341 (2002)
  3. "“A signal processing technique for interferometric fiber-optic sensors”", 6(4), pp.365~372 (1995)
  4. "“A frequency ramped modulation technique for measurement with fiber optic sensor”", 95, pp.86~91 (1995)
  5. "“Measurement of optical frequency change in LD during pulse operation”", 17, pp.19~26 (2006)
  6. "“Time dependent thermal effects in current modulated semiconductor lasers”", pp.497~499 (1981)

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