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Demodulation method of orthogonal interferometer based on 1/8 wave plate
Zhen Shenglai * #,Cheng Xiaoyan
School of physics and material science,Anhui University,Hefei 230601
*Correspondence author
#Submitted by
Subject:
Funding: Specialized Research Fund for the Doctoral Program of Higher Education （No.No.20113401120002 and No.20093401110002), and the natural science foundation of Anhui Province）
Opened online:17 October 2013
Accepted by: none
Citation: Zhen Shenglai,Cheng Xiaoyan.Demodulation method of orthogonal interferometer based on 1/8 wave plate[OL]. [17 October 2013] http://en.paper.edu.cn/en_releasepaper/content/4563586
 
 
The orthogonal interferometer based on 1/8 wave plate generates orthogonal signals by optical configuration. It is widely applied to interference system because of simple optical path and passive demodulation scheme for easy operation. But in the process of demodulation, the DC component of the signal needs to be eliminated. Because of the instability of light source and optical structure, the DC component of the signal may change over time. Therefore the circuit subtracting a constant can not thoroughly eliminate the DC component, causing the demodulation results are inaccurate. A improved demodulation algorithm is proposed in this paper. Theoretical analysis and experimental results show that, the demodulation method is almost not affected by the size of the DC component. When small deviation in DC component occurs, the demodulation results keep stable and accurate.
Keywords:interferometer; 1/8 wave plate; orthogonal signals; demodulation method；direct componentk.
 
 
 

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