FIELD: physics.
SUBSTANCE: additional membrane which reflects sound waves is placed on the propagation path of sound waves, where dimensions of said membrane are not smaller than the wavelength in the lower ultrasonic frequency range of the controlled devices, and said membrane is moved towards or opposite the direction of propagation of the vibrations, and standing wave pressure picked up by the additional membrane is transmitted to a microphone diaphragm which converts the pressure into an electric signal, presence of which indicates presence of acoustic vibrations.
EFFECT: simplification, wider field of use of the method and wider range of detected frequencies.
1 dwg
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