12 January 2018 Balanced detection for self-mixing interferometry to improve signal-to-noise ratio
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Abstract
We apply balanced detection to self-mixing interferometry for displacement and vibration measurement, using two photodiodes for implementing a differential acquisition. The method is based on the phase opposition of the self-mixing signal measured between the two laser diode facet outputs. The balanced signal obtained by enlarging the self-mixing signal, also by canceling of the common-due noises mainly due to disturbances on laser supply and transimpedance amplifier. Experimental results demonstrate the signal-to-noise ratio significantly improves, with almost twice signals enhancement and more than half noise decreasing. This method allows for more robust, longer-distance measurement systems, especially using fringe-counting.
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Changming Zhao, Michele Norgia, Kun Li, "Balanced detection for self-mixing interferometry to improve signal-to-noise ratio", Proc. SPIE 10619, 2017 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications, 1061902 (12 January 2018); doi: 10.1117/12.2295473; https://doi.org/10.1117/12.2295473
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