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Proceedings Paper

Second harmonic measurement of multi-beam laser heterodyne with ultra-precision for the small angle
Author(s): Y. Chao Li; Q. Ding; Y. Qiao Wang; J. Ru Yang; C. Yu Liu; C. Hui Wang; J. Feng Sun
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Paper Abstract

In order to improve the measurement accuracy of the angle and signal processing speed of operation, this paper proposes a novel method of second harmonic measurement of multi-beam laser heterodyne for the angle, which based on the combination of Doppler effect and heterodyne technology, loaded the information of the angle to the frequency difference of second harmonic of the multi-beam laser heterodyne signal by frequency modulation of the oscillating mirror, which is in the light path. Heterodyne signal frequency can be obtained by fast Fourier transform, and can obtain values of the angle accurately after the multi-beam laser heterodyne signal demodulation. This novel method is used to simulate measurement for incident angle of standard mirror by Matlab, the obtained result shows that the relative measurement error of this method is just 0.5213%.

Paper Details

Date Published: 22 August 2015
PDF: 6 pages
Proc. SPIE 9656, International Symposium on Photonics and Optoelectronics 2015, 965603 (22 August 2015); doi: 10.1117/12.2193855
Show Author Affiliations
Y. Chao Li, Heilongjiang Univ. (China)
Q. Ding, Heilongjiang Univ. (China)
Y. Qiao Wang, Heilongjiang Univ. (China)
J. Ru Yang, Heilongjiang Univ. (China)
C. Yu Liu, Heilongjiang Univ. (China)
C. Hui Wang, Harbin Institute of Technology (China)
J. Feng Sun, Harbin Institute of Technology (China)


Published in SPIE Proceedings Vol. 9656:
International Symposium on Photonics and Optoelectronics 2015
Zhiping Zhou, Editor(s)

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