Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Signal processing of interferometric sensor using modified ramp modulation

변형 램프변조를 이용한 간섭 센서의 신호처리

  • Kang, Hyun-Sook (Department of Electronics and Laser Engineering, and Institute for Laser Engineering, Kyung Hee University) ;
  • Yeh, Yun-Hae (Department of Electronics and Laser Engineering, and Institute for Laser Engineering, Kyung Hee University)
  • 강현숙 (경희대학교 전자정보대학 레이져공학 연구소) ;
  • 예윤해 (경희대학교 전자정보대학 레이져공학 연구소)
  • Published : 2007.09.29
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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 in a laser diode to linearize the relationship between the optical phase shift and measurand. It is found that the waveform could be modeled as the addition of a linear term and an exponential term. A signal processor adopting modified ramp modulation technique is implemented and evaluated to find linearity, drift and random walk of $<{\pm}1.5%$, $0.4^{\circ}C$, $5.28{\times}10^{-4}^{\circ}C/{\sqrt{Hz}}$.

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References

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