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

Yanchao Li | Zendy; Wang Chunhui | Zendy; G. K. Long | Zendy; Haifang Cong | Zendy; Yang Qu | Zendy

Open Access

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

Author(s) -

Yanchao Li,

Wang Chunhui,

G. K. Long,

Haifang Cong,

Yang Qu

Publication year - 2012

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.61.010601

Subject(s) - heterodyne (poetry) , optics , demodulation , signal (programming language) , beam (structure) , harmonic , modulation (music) , physics , laser , heterodyne detection , laser doppler vibrometer , frequency modulation , laser beams , acoustics , radio frequency , computer science , telecommunications , channel (broadcasting) , programming language

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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