Air Ultrasonic Signal Localization with a Beamforming Microphone Array

Figure 11

Beamforming result at 75 kHz frequency calculated from the experimental data acquired with the synthetic spiral array (V = 8.2) with 32 elements. Z-distance of the microphone to the screen: (a) 0.5 D; (b) 0.65 D; (c) 0.9 D.

(a)

(b)

(c)