FIELD: acoustic devices. SUBSTANCE: device has sound oscillator, which output is connected to sound emitter, sound receiver, which is mounted for movement along acoustic axis of emitter, reference signal source, which frequency is close to frequency of sound oscillator, mixer, which inputs are connected to output of sound receiver and reference signal source and which output is connected to light indicator of amplitude through receiver. EFFECT: increased functional capabilities. 3 cl, 3 dwg
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