FIELD: electricity.
SUBSTANCE: device includes piezoelectric converter, antenna, preliminary and antenna amplifiers, switching unit, double balance mixing unit, heterodyne oscillator with frequency control circuits, filter and intermediate frequency amplifier, amplitude detector, half-period average values converter, low frequency amplifier. Piezoelectric converter output is connected to preliminary amplifier input, antenna amplifier input - to antenna. Amplifiers' outputs are connected to inputs of switching unit, the output of which is connected to mixing unit first input. Mixing unit second input is connected to heterodyne oscillator output, and output - to intermediate frequency amplifier input. Intermediate frequency filter output is connected to input of intermediate frequency amplifier, the output of which is connected to inputs of amplitude detector and half-period average values converter, the output of the latter is connected to signal level indication unit. Amplitude detector output is connected to input of low frequency filter, the output of which is connected to low frequency amplifier input. Control unit outputs are connected to heterodyne oscillator frequency control circuits and switching unit control input.
EFFECT: improvement of control reliability and enlarging application range.
1 dwg
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