FIELD: information technology.
SUBSTANCE: device includes a generator (1), a first buffer amplifier (2), an antenna/sensor (3), an oscillatory circuit (4), a second buffer amplifier (5), a band-pass filter (6), a high-frequency amplifier (7), a detector (8), a low-frequency amplifier (9), a controlled attenuator (10), a threshold unit (11), an actuating unit (12), a dc voltage generator (13), an algebraic adder (14), a peak detector (15).
EFFECT: high sensitivity and reliability of the device.
2 dwg
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