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Appl Opt. 2012 Oct 10;51(29):6962-7. doi: 10.1364/AO.51.006962.

Improved phase generated carrier demodulation algorithm for eliminating light intensity disturbance and phase modulation amplitude variation.

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Optoelectronics System Laboratory, Institute of Semiconductors, Chinese Academy of Science, Beijing, China.


In this paper we propose a novel, improved, phase generated carrier (PGC) demodulation algorithm based on the PGC-differential-cross-multiplying approach (PGC-DCM). The influence of phase modulation amplitude variation and light intensity disturbance (LID) on traditional PGC demodulation algorithms is analyzed theoretically and experimentally. An experimental system for remote no-contact microvibration measurement is set up to confirm the stability of the improved PGC algorithm with LID. In the experiment, when the LID with a frequency of 50 Hz and the depth of 0.3 is applied, the signal-to-noise and distortion ratio (SINAD) of the improved PGC algorithm is 19 dB, higher than the SINAD of the PGC-DCM algorithm, which is 8.7 dB.


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