Lasers, Fiber Optics, and Communications

Multiple self-mixing interferometry for displacement measurement based on quadrature demodulation technique

[+] Author Affiliations
Xiufang Wang, Zhuo Xiang, Bingkun Gao

Northeast Petroleum University, College of Electrical and Information Engineering, Xuefu Street 99, High-tech Development Zone, Daqing 163318, China

Chunlei Jiang

Northeast Petroleum University, College of Electrical and Information Engineering, Xuefu Street 99, High-tech Development Zone, Daqing 163318, China

Harbin Institute of Technology, School of Electrical Engineering and Automation, West Dazhi Street 92, Nangang District, Harbin 150001, China

Opt. Eng. 55(12), 126116 (Dec 29, 2016). doi:10.1117/1.OE.55.12.126116
History: Received August 28, 2016; Accepted December 7, 2016
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Abstract.  To improve the accuracy of displacement measurements in self-mixing interferometry (SMI), a multiple self-mixing interferometry (MSMI) process that involves phase modulation is proposed. The phase is modulated using an electro-optic modulator that is placed in the external cavity. Phase demodulation is performed using the quadrature demodulation algorithm. In theory, the displacement reconstruction accuracy of MSMI is better than that of SMI, and this is demonstrated using simulations. A series of experiments are also conducted to confirm the effectiveness of the proposed method. The method is shown to meet the requirements for real-time high-precision measurements. In addition, the quadrature demodulation technique used does not involve complex computations.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Xiufang Wang ; Zhuo Xiang ; Bingkun Gao and Chunlei Jiang
"Multiple self-mixing interferometry for displacement measurement based on quadrature demodulation technique", Opt. Eng. 55(12), 126116 (Dec 29, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.126116


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