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9 November 2010 Noise analysis of laser Doppler system which adopting the phase generated carrier demodulation method
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Abstract
Laser Doppler vibration measuring system has been widely used in many fields, in order to eliminate the phase fading, phase generated carrier (PGC) homodyne demodulation technology has been applied usually, and dual-optical-channel balanced detection technology has been used to suppress the intensity noise of the light source. However, theoretical analysis reveals that the intensity noise of the light source cannot be eliminate totally due to the modulation, which is still the main noise in the system. In this paper, we consider the influence of the intensity noise of the light source and the shot noise of the detectors. By numerical simulating, we analyze the origin of the noise, especially the influence of remnant intensity noise to signal-to-noise ratio of the system, and find the optimal parameters of the system.
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Lei Zhu, Shenglai Zhen, Yuanyuan Zhang, and Benli Yu "Noise analysis of laser Doppler system which adopting the phase generated carrier demodulation method", Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78532C (9 November 2010); https://doi.org/10.1117/12.869764
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