Abstract
In this study, a 20 kHz ultrasonic standing wave field in a water tank is studied using scanning-focused laser differential interferometry (SFLDI). The emitting and receiving ends of the focused laser differential interferometry system are mounted on two high-precision three-dimensional coordinate frames that can move synchronously. A high-speed schlieren measurement and numerical simulations are conducted to validate the SFLDI results. The SFLDI system exhibits good synchronicity between the emitting and receiving ends as it scans the water tank with the acoustic field off, as well as a good frequency response to 20 kHz waves with the acoustic field on. Consistent with both the schlieren measurement and simulations, the SFLDI results clearly show a typical multi-column standing wave pattern with a mean square error of about 6.8% compared to the simulations. This study provides a new approach for quantitatively visualizing acoustic fields with high frequencies.
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