Effect of windowing on a sensing signal generated by self-mixing interferometry

Han Wang; Yuxi Ruan; Yanguang Yu; Jiangtao Xi; Qinghua Guo; Jun Tong

doi:10.1117/12.2542368

12 November 2019 Effect of windowing on a sensing signal generated by self-mixing interferometry

Han Wang, Yuxi Ruan, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong

Proceedings Volume 11197, SPIE Future Sensing Technologies; 111970F (2019) https://doi.org/10.1117/12.2542368
Event: SPIE Future Sensing Technologies, 2019, Tokyo, Japan

Abstract

The laser diode (LD) is modulated by the injection current of triangular waveform and a photo diode (PD) is packaged in the rear of the LD. The laser reflected by the target re-enters the cavity of LD and contains the target’s displacement information. The information is carried within the laser intensity and can be pickup by the PD. We call this laser intensity as self-mixing interferometry (SMI) signal. While processing the sensing SMI signals, we should carefully determine the windowing function and reduce the effect of windowing in the FFT and IFFT process while applying the mathematical model. Simulation results show that the proposed design is able to accomplish the measurement of micro-displacement with high resolution and great accuracy.

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Han Wang, Yuxi Ruan, Yanguang Yu, Jiangtao Xi, Qinghua Guo, and Jun Tong "Effect of windowing on a sensing signal generated by self-mixing interferometry", Proc. SPIE 11197, SPIE Future Sensing Technologies, 111970F (12 November 2019); https://doi.org/10.1117/12.2542368

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KEYWORDS

Interferometry

Signal generators

Signal processing

Laser interferometry

Semiconductor lasers

Diodes

Mathematical modeling

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