Multi-beam laser heterodyne measurement with ultra-precision for the angle based on oscillating mirror sinusoidal modulation

Author

Li, Yan Chao ; Wang, Chun Hui ; Gao, Long

Author_Institution

Nat. Key Lab. of Tunable Laser Technol., Harbin Inst. of Technol., Harbin, China

fYear

2011

fDate

12-16 Oct. 2011

Firstpage

183

Lastpage

186

Abstract

This paper proposes a novel method of multi-beam laser heterodyne measurement for the angle. Based on Doppler effect and heterodyne technology, loaded the information of the angle to the frequency difference of the multi-beam laser heterodyne signal by sinusoidal frequency modulation of the oscillating mirror, which move as simple harmonic motion, this method can obtain many values of the angle after the multi-beam laser heterodyne signal demodulation simultaneously. Processing these values by weighted-average, it can obtain the angle accurately. This novel method is used to simulate measurement for incident angle of standard plane mirror by MATLAB, the obtained result shows that the relative measurement error of this method is just 0.49%.

Keywords

Doppler measurement; demodulation; frequency modulation; laser mirrors; mathematics computing; measurement by laser beam; measurement errors; optical modulation; Doppler effect; MATLAB; frequency difference; harmonic motion; multibeam laser heterodyne measurement; oscillating mirror; relative measurement error; signal demodulation; sinusoidal frequency modulation; standard plane mirror; ultraprecision measurement; Extraterrestrial measurements; Frequency measurement; Frequency modulation; Measurement by laser beam; Mirrors; Optical interferometry; Optical variables measurement; Doppler effect; Heterodyne; Nondestructive testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Optoelectronics and Microelectronics Technology (AISOMT), 2011 Academic International Symposium on

Conference_Location

Harbin

Print_ISBN

978-1-4577-0794-0

Type

conf

DOI

10.1109/AISMOT.2011.6159349

Filename

6159349