FIELD: instrument industry.
SUBSTANCE: device comprises scanning device and receiving unit. The scanning device has master oscillator, power amplifier, duplexer , receiving/transmitting aerial, phase doubler, phase divider, first and send narrow-band filters, phase detector, phase meter, recording unit, heterodyne, mixer, amplifier of the intermediate frequency, first and second multipliers, and band filter. The receiving unit has sound duct, aerial, two systems of comb electrodes, two buses, diaphragm, and reflecting grid.
EFFECT: enhanced sensitivity.
3 dwg
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