Acoustic power flow measurement in a thermoacoustic resonator by means of laser Doppler anemometry (LDA) and microphonic measurement

Acoustic power flow measurements in the resonator of a thermoacoustic refri gerator are described. The technique of measurement is based on particle ve locity measurement by laser Doppler anemometry (L.D.A.) together with micro phonic acoustic pressure measurement. The calibration procedure is explaine d and results of measurements are compared with analytical results. The L.D .A. technique permits the measurement of acoustic power flow at almost any position and for almost any working frequency in the resonator of thermoaco ustic devices. (C) 2000 Elsevier Science Ltd. All rights reserved.