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Proceedings Paper

Nonlinearity correction method study of orthogonal polarized laser interference signal based on DSP technique
Author(s): Xin-xing Wang; Jun Yang; Zhi-hai Liu; Li-bo Yuan
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Paper Abstract

A nonlinearity correction using ellipse fitting technique based on orthogonal polarized laser interferometer is proposed in this paper. In this paper, characteristics of four-channel output signals based on polarized Michelson laser interferometer are studied. The orthogonal signal's non-orthogonal error which is caused by temperature disturbance and low frequency vibration noise is compensated. Besides, a new algorithm of demodulating small phase signal is proposed. Low frequency vibration signal demodulation system based on DSP technique is constructed. It proposed an ellipse fitting algorithm based on Least-squares theory. This algorithm can achieve correction error of less than ±0.3%. System's real-time measurement capability and its resolution can be improved.

Paper Details

Date Published: 26 November 2007
PDF: 8 pages
Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 68300K (26 November 2007); doi: 10.1117/12.757168
Show Author Affiliations
Xin-xing Wang, Harbin Engineering Univ. (China)
Jun Yang, Harbin Engineering Univ. (China)
Zhi-hai Liu, Harbin Engineering Univ. (China)
Li-bo Yuan, Harbin Engineering Univ. (China)

Published in SPIE Proceedings Vol. 6830:
Advanced Sensor Systems and Applications III
Yun-Jiang Rao; Yanbiao Liao; Gang-Ding Peng, Editor(s)

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