Calibration of acoustic particle velocity sensors using a laser based method
A reliable calibration procedure is crucial for obtaining a physical quantity related to a sensor output signal. Unlike microphone calibration, the lack of standardized procedures for characterizing particle velocity sensors has triggered the development of several techniques based on different criteria. Most common methods rely on measurements of a known quantity linked to acoustic particle velocity through a well-defined mechanism. Alternatively, photon correlation spectroscopy has emerged as a powerful method of directly quantifying acoustical parameters in an absolute manner. Photons scattered due to sound-propagating oscillating particles within a small optical volume created by crossing two laser beams are captured by a single photon counter and analysed. This enables the particle velocity to be measured and thus the acoustic pressure to be calculated. By repeating this process over discrete frequencies, a full calibration can be achieved. In this paper, photon correlation spectroscopy is used to calibrate a particle velocity transducer. A comparison with other calibration procedures shows a good correlation between them, demonstrating the feasibility of this novel absolute calibration method.
Fernandez Comesaña, D., Koukoulas, T., Piper, B. and Jongh, E.J., 2016. CALIBRATION OF ACOUSTIC PARTICLE VELOCITY SENSORS USING A LASER BASED METHOD. In 23rd International Congress on Sound and Vibration (pp. 1-8).