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Second harmonic multi-beam laser heterodyne measurement for small angle based on oscillating mirror sinusoidal modulation

Li Yan-Chao Wang Chun-Hui Gao Long Cong Hai-Fang Qu Yang

Second harmonic multi-beam laser heterodyne measurement for small angle based on oscillating mirror sinusoidal modulation

Li Yan-Chao, Wang Chun-Hui, Gao Long, Cong Hai-Fang, Qu Yang
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  • Abstract views:  1442
  • PDF Downloads:  337
  • Cited By: 0
Publishing process
  • Received Date:  18 March 2011
  • Accepted Date:  24 March 2011
  • Published Online:  05 January 2012

Second harmonic multi-beam laser heterodyne measurement for small angle based on oscillating mirror sinusoidal modulation

  • 1. National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 61068063), and Harbin Institute of Technology Incubation Program of Major International Science and Technology Cooperation, China (Grant No. HIT.ICRST2010014).

Abstract: In this paper, we propose a novel method of multi-beam laser heterodyne measurement for small angle based on sinusoidal modulation of simple harmonic motion oscillating mirror. By using the Doppler effect and heterodyne technology, by loading the information about small angle into the frequency difference of the multi-beam laser heterodyne signal, by using the frequency modulation of the oscillating mirror, this method can give many values of small angle after the multi-beam laser heterodyne signal demodulation simultaneously. Processing these values by weighted-average, small angle can be obtained accurately. This novel method is used to simulate measurement for small angle by MATLAB, the obtained result shows that the relative measurement error of this method is just 0.789677%.

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