22 August 2015 Second harmonic measurement of multi-beam laser heterodyne with ultra-precision for the small angle
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Proceedings Volume 9656, International Symposium on Photonics and Optoelectronics 2015; 965603 (2015) https://doi.org/10.1117/12.2193855
Event: International Symposium on Photonics and Optics, 2015, Shanghai, China
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%.
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Y. Chao Li, Y. Chao Li, Q. Ding, Q. Ding, Y. Qiao Wang, Y. Qiao Wang, J. Ru Yang, J. Ru Yang, C. Yu Liu, C. Yu Liu, C. Hui Wang, C. Hui Wang, J. Feng Sun, J. Feng Sun, } "Second harmonic measurement of multi-beam laser heterodyne with ultra-precision for the small angle", Proc. SPIE 9656, International Symposium on Photonics and Optoelectronics 2015, 965603 (22 August 2015); doi: 10.1117/12.2193855; https://doi.org/10.1117/12.2193855
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