Acta Optica Sinica, Volume. 31, Issue 7, 701006(2011)
Demodulating Atmospheric Turbulence Random Phase Difference Based on Hilbert Transform
An algorithm of demodulating dynamic phase difference based on Hilbert transform is proposed according to the principle and signal expression of fiber interference turbulence measurement system. The results of numerical simulation show that waveform phase difference and turbulence′s random phase difference can be demodulated by this method and absolute error is less than 10-3, which is in accordance with the results of correlation method. Compared to the correlated algorithm, the algorithm of Hilbert transform doesn′t have smooth effect on signal and doesn′t need to set correlation length, so it can reflect characteristic of signal frequency better. This research provides a new method for measuring turbulence random phase difference.
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Xiao Shumei, Mei Haiping, Qian Xianmei, Rao Ruizhong. Demodulating Atmospheric Turbulence Random Phase Difference Based on Hilbert Transform[J]. Acta Optica Sinica, 2011, 31(7): 701006
Category: Atmospheric Optics and Oceanic Optics
Received: Dec. 10, 2010
Accepted: --
Published Online: Jun. 28, 2011
The Author Email: Shumei Xiao (apzml@126.com)