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Proceedings Paper

Performance improvement of PGC method by using lookup table for optical seismometer
Author(s): Changdong Tian; Liwei Wang; Min Zhang; Huayong Zhang; Xiaohui Chu; Shurong Lai; Yanbiao Liao
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Paper 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.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750348 (5 October 2009); doi: 10.1117/12.834107
Show Author Affiliations
Changdong Tian, Tsinghua Univ. (China)
Liwei Wang, Tsinghua Univ. (China)
Min Zhang, Tsinghua Univ. (China)
Huayong Zhang, Tsinghua Univ. (China)
Xiaohui Chu, Tsinghua Univ. (China)
Shurong Lai, Tsinghua Univ. (China)
Yanbiao Liao, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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