Algorithm research of high-precision optical interferometric phase demodulation based on FPGA

Chunxiao Zhi; Jinghua Sun

doi:10.1117/12.999580

20 November 2012 Algorithm research of high-precision optical interferometric phase demodulation based on FPGA

Chunxiao Zhi, Jinghua Sun

Proceedings Volume 8563, Optical Metrology and Inspection for Industrial Applications II; 85631E (2012) https://doi.org/10.1117/12.999580
Event: Photonics Asia, 2012, Beijing, China

Abstract

Optical interferometric phase demodulation algorithm is provided based on the principle of phase generated carrier (PGC), which can realize the optical interference measurement of high-precision signal demodulation, applied to optical fiber displacement, vibration sensor. Modulated photoelectric detection signal is performanced by interval 8 frequency multiplication sampling. The samples calculate the phase modulation depth and phase error through a feedback loop to achieve optimum working point control. On the other hand the results of sampling calculate precision of numerical of the phase. The algorithm uses the addition and subtraction method instead of correlation filtering and other related complex calculation process of the traditional PGC digital demodulation, making full use of FPGA data processing with advantage of high speed and parallel; This method can give full play to the advantage of FPGA performance. Otherwise, the speed at the same time, FPGA can also ensure that the phase demodulation precision, wide dynamic range, and give full play to the advantage of completing the data access by single clock cycle.

Citation Download Citation

Chunxiao Zhi and Jinghua Sun "Algorithm research of high-precision optical interferometric phase demodulation based on FPGA", Proc. SPIE 8563, Optical Metrology and Inspection for Industrial Applications II, 85631E (20 November 2012); https://doi.org/10.1117/12.999580

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