Open AccessSecond harmonic multi-beam laser heterodyne measurement for small angle based on oscillating mirror sinusoidal modulation
Author(s) -
Yanchao Li,
Chunhui Wang,
G. K. Long,
Huan Cong,
Yang Qu
Publication year - 2012
Publication title -
wuli xuebao
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%.