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Proceedings Paper

Algorithm research of high-precision optical interferometric phase demodulation based on FPGA
Author(s): Chunxiao Zhi; Jinghua Sun
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Paper 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.

Paper Details

Date Published: 20 November 2012
PDF: 6 pages
Proc. SPIE 8563, Optical Metrology and Inspection for Industrial Applications II, 85631E (20 November 2012); doi: 10.1117/12.999580
Show Author Affiliations
Chunxiao Zhi, Harbin Engineering Univ. (China)
Jinghua Sun, Harbin Engineering Univ. (China)

Published in SPIE Proceedings Vol. 8563:
Optical Metrology and Inspection for Industrial Applications II
Kevin G. Harding; Peisen S. Huang; Toru Yoshizawa, Editor(s)

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