Title :
Real-time acoustic velocity measurement in the air by means of laser Doppler velocimetry
Author :
Le Duff, A. ; Poggi, S. ; Plantier, G. ; Valiere, J.C.
Author_Institution :
Ecole Superieure d´´Electron. del´´Ouest, Angers, France
Abstract :
A technique based on the use of an analog phase-locked loop and a quadrature demodulation to estimate particle velocity and convection velocity in an acoustic field in the air excited with a sine wave forced source is presented This method turns to be well suitable for real-time measurement of acoustic signals with low modulation level. A SIMULINK(R) program has been written in order to validate the method. Finally, the performance of the estimator is illustrated by Monte-Carlo simulations obtained from synthesized Doppler signals
Keywords :
acoustic wave velocity measurement; aeroacoustics; air; demodulation; laser velocimetry; light interferometry; phase locked loops; signal processing; Monte-Carlo simulations; SIMULINK program; acoustic field; analog phase-locked loop; convection velocity; laser Doppler velocimetry; low modulation level signals; particle velocity; quadrature demodulation; real-time acoustic velocity measurement; sine wave forced source excited air; synthesized Doppler signals; Acoustic measurements; Acoustic waves; Demodulation; Force measurement; Particle measurements; Phase estimation; Phase locked loops; Phase measurement; Phase modulation; Velocity measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
Print_ISBN :
0-7803-6646-8
DOI :
10.1109/IMTC.2001.928818
