Performance improvement of PGC method by using lookup table for optical seismometer

Changdong Tian; Liwei Wang; Min Zhang; Huayong Zhang; Xiaohui Chu; Shurong Lai; Yanbiao Liao

doi:10.1117/12.834107

5 October 2009 Performance improvement of PGC method by using lookup table for optical seismometer

Changdong Tian, Liwei Wang, Min Zhang, Huayong Zhang, Xiaohui Chu, Shurong Lai, Yanbiao Liao

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 750348 (2009) https://doi.org/10.1117/12.834107
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

A new demodulation method is proposed to eliminate the light intensity disturbance(LID) due to the Phase Generate Carrier( PGC) modulation method for the optical marine seismometer which is based on the fiber interferometer. A look up table by the use of a nonlinear function has been demonstrated. The experimental results show that the performance of the system has been improved with the harmonic suppression ratio(HSR) of the demodulation results increasing 30dB and the dynamic range of the system increasing 26dB, comparing with the Differential Cross-Multiplying(DCM) algorithm for the PGC method. The new method approaches a dynamic range of 130dB@100Hz with the HSR more than 50dB.

Citation Download Citation

Changdong Tian, Liwei Wang, Min Zhang, Huayong Zhang, Xiaohui Chu, Shurong Lai, and Yanbiao Liao "Performance improvement of PGC method by using lookup table for optical seismometer", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750348 (5 October 2009); https://doi.org/10.1117/12.834107

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