Fig. 8: Experiment setups.
From: Tunable acoustic vortex generation by a compact rotating disk
Measurement of the modulated acoustic vortex in a fully anechoic chamber environment. The sound pressure data is obtained using two microphones (Micro), a data acquisition, a personal computer (PC), and a sound card. The disk is driven and controlled by a brushless direct current motor, power supply, controller, and actuator. The inset provides a partially enlarged view of the microphone detection process, scaled at 1:50.
