Nonlinearity correction method study of orthogonal polarized laser interference signal based on DSP technique

Xin-xing Wang; Jun Yang; Zhi-hai Liu; Li-bo Yuan

doi:10.1117/12.757168

26 November 2007 Nonlinearity correction method study of orthogonal polarized laser interference signal based on DSP technique

Xin-xing Wang, Jun Yang, Zhi-hai Liu, Li-bo Yuan

Author Affiliations +

Proceedings Volume 6830, Advanced Sensor Systems and Applications III; 68300K (2007) https://doi.org/10.1117/12.757168
Event: Photonics Asia 2007, 2007, Beijing, China

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.

Citation Download Citation

Xin-xing Wang, Jun Yang, Zhi-hai Liu, and Li-bo Yuan "Nonlinearity correction method study of orthogonal polarized laser interference signal based on DSP technique", Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 68300K (26 November 2007); https://doi.org/10.1117/12.757168

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