Fig. 3: Experimental measurement of SPL response with respect to driving voltage of the eco-friendly flexible electret loudspeakers.
From: Scalable and eco-friendly flexible loudspeakers for distributed human-machine interactions
a Experimental setup for SPL measurement. b Diagram illustrating the details of the SPL measurement. c–e Measured SPL as a function of driving voltage considering different parameters when the driving frequency is 6 kHz. c Top and bottom paper substrates with different thicknesses, measured with configuration with holes on the paper substrates. d PLA electret films with different surface potentials, measured with configuration with holes on the paper substrates. e Paper substrates with and without holes, the insets show the photos of the loudspeakers with and without holes (scale bar, 1 cm). Under the same driving conditions, we test the SPL outputs of three devices and we show the typical outputs.
