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| Measurement of Particle Vibration Velocity in Air-borne Sound Field with the Photon Correlation Method |
| LI Liang-jie1, HE Long-biao2, WANG Xue-jing1 |
1.College of Information & Technology, Beijing University of Chemical Technology, Beijing 100029, China;
2. National Institute of Metrology, Beijing 100029, China |
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Abstract The particle vibration velocity is an important parameter to evaluate the characteristics of the sound field. Photoelectric signal of scatter light was obtained laser Doppler velocimetry at different sound pressure level in plane wave sound field. And the Doppler signal was processed by autocorrelation method, the velocity can be calculated based on the time of characteristic values ??of the correlation function and compared with that of microphone. Furthermore, on the basis of the autocorrelation algorithm, the difference which caused by the ratio of the original signal frequency offset and the Doppler frequency is not an integer multiple was reduced by the interpolation method. The results demonstrate that the photon correlation method is able to obtain particle vibration velocity of the sound field. and results show good agreement with that measured by microphone, interpolation method is conducive to decreasing the deviation when velocity is large relatively。The deviation of the two methods is less than 0.7dB at the sound pressure level from 96 dB to 110 dB.
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2014, Vol. 35 
