The Analysis and Design of a Large Stroke with High-Precision Polarized Laser Interferometer System

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The technique utilizing single-frequency laser interferometry has very high measurement accuracy, but it has rigorous requirements for optical design which is affected by many factors. In order to achieve single-frequency laser interferometry with large stroke and high precision, the integral layout, the polarization phase shifting technique and the common mode rejection method are adopted to design the length interferometry system. This paper analyzes factors and design requirements which affect measurement accuracy with large stroke. Based on polarization phase shifting technique, the system employs the four-beam-signal detection technique and the common mode rejection method, to make a differential processing of four mutually orthogonal signals. Thus, the influences of zero-drift of intensity and environmental change on system are reduced. Combined with a 200 phase subdivision, the system achieves the resolution with 0.8 nm. Under the VC++ environment, the displacement measurement results are compensated and corrected according to the environmental parameters. Compared with the Renishaw XL-80 laser interferometer, the system has better stability in short term. In the measuring range of 60 mm, the effectiveness of the system is verified.

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Edited by:

Chen Xin, Lee Wingbun, Liu Qiang, Cheung ChiFai, To Suet and Wang Sujuan

Pages:

129-134

Citation:

W. D. Wu et al., "The Analysis and Design of a Large Stroke with High-Precision Polarized Laser Interferometer System", Key Engineering Materials, Vol. 679, pp. 129-134, 2016

Online since:

February 2016

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$38.00

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