Signal processing of micro displacement measurement based on laser feedback interference system

Author

Wenjuan, Cao ; Huilan, Liu ; Xiaoqing, Zhang

Author_Institution

Sch. of Photoelectronic Inf. & Commun., Beijing Inf. Sci. & Technol. Univ., Beijing, China

fYear

2011

fDate

14-16 Sept. 2011

Firstpage

1

Lastpage

5

Abstract

The original experimental signal of laser feedback interference system usually has much noise, which mainly consist of high frequency noise and low frequency fluctuation, and cannot reconstruct micro displacement accurately. In order to improve the accuracy of the reconstruction displacement, the original experimental laser feedback interference signal is preprocessed by filtering the noise. Micro displacement is reconstructed by phase-freezing technology after demodulating the preprocessed signal. The experiment results show that the preprocessed signal makes the accuracy of reconstruction displacement in λ/20 resolution. The reconstruction error of fitting is less than λ/20.

Keywords

demodulation; displacement measurement; laser feedback; laser noise; light interference; measurement by laser beam; optical filters; optical information processing; high frequency noise; laser feedback interference system; low frequency fluctuation; microdisplacement measurement; noise filtering; phase-freezing technology; reconstruction displacement; reconstruction error; signal demodulation; signal processing; Finite impulse response filter; Interference; Laser feedback; Laser theory; Measurement by laser beam; displacement measurement; filter; laser feedback interference; phase-freezing technology; reconstruction;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing, Communications and Computing (ICSPCC), 2011 IEEE International Conference on

Conference_Location

Xi´an

Print_ISBN

978-1-4577-0893-0

Type

conf

DOI

10.1109/ICSPCC.2011.6061659

Filename

6061659