Processing methods in frequency domain for bubble laser scattering signals

Liping Su; Weijiang Zhao; Deming Ren; Yanchen Qu; Xiaoyong Hu

doi:10.1117/12.834911

28 August 2009 Processing methods in frequency domain for bubble laser scattering signals

Liping Su, Weijiang Zhao, Deming Ren, Yanchen Qu, Xiaoyong Hu

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 73822X (2009) https://doi.org/10.1117/12.834911
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

For the detection of the bubble-laser-scattering property, it is the key to improve the signal to noise ratio. The various noises in the bubble-laser-scattering signal, the background light, power frequency of 50Hz, radio frequency noise and inherent noise within the electronic system, are analyzed in detailed. Two frequency-domain methods used to process the bubble scattering signal, the Fourier transform and the power spectral estimation, are focused on. These two methods can reduce the noise, isolate the DC component and eliminate the impact of the power frequency of 50Hz, thus the pulse of bubble laser scattering could be detected. The physical meaning for the power spectral estimation is much clearer than that of the Fourier transform. The power spectrum curve obtained by using the Yule-Walker AR (regression model) method is much smoother and its frequency resolution is higher than the other methods. The results show that the Yule- Walker AR spectrum estimation is the most reasonable and most effective method.

Citation Download Citation

Liping Su, Weijiang Zhao, Deming Ren, Yanchen Qu, and Xiaoyong Hu "Processing methods in frequency domain for bubble laser scattering signals", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73822X (28 August 2009); https://doi.org/10.1117/12.834911

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