All-digital demodulation system of interferometric fiber optic sensors using an improved PGC algorithm based on fundamental frequency mixing
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Tianjin Key Laboratory of Film Electronics and Communication Devices, Communication Devices and Technology Engineering Research Center, Ministry of Education of China, Tianjin University of Technology, Tianjin 300384, China

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TN253

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    Abstract:

    We present an all-digital demodulation system of interferometric fiber optic sensor based on an improved arctangent-differential-self-multiplying (arctan-DSM) algorithm. The total harmonic distortion (THD) and the light intensity disturbance (LID) are also suppressed, the same as those in the traditional arctan-DSM algorithm. Moreover, the lowest sampling frequency is also reduced by introducing anti-aliasing filter, so the occupation of the system memory is reduced. The simulations show that the improved algorithm can correctly demodulate cosine signal and chirp signal with lower sampling frequency.

    Reference
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    [11] Zhang Yabin, Dou Zheng, Wang Yong and Cao Jianian, The Lowest Sample Frequency of PGC Demodulation Method for Interferential Fiber-Optic Sensor, Symposium on Photonics and Optoelectronics, 1 (2010).
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ZHANG Ai-ling, WANG Kai-han, ZHANG Shuai, WANG Yan. All-digital demodulation system of interferometric fiber optic sensors using an improved PGC algorithm based on fundamental frequency mixing[J]. Optoelectronics Letters,2015,11(3):222-225

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History
  • Received:December 15,2014
  • Revised:January 23,2015
  • Online: November 26,2015
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