FIELD: physics.
SUBSTANCE: metal detector has a search LC generator with a search inductance coil, a reference high-frequency generator, a selective-amplification unit, a two-input mixer, a beat signal amplifier and an actuating unit. The selective-amplification unit performs selection and amplification of high-frequency harmonics of the output signal of the search generator with subsequent transmission of the selected high-frequency harmonic signal to the input of the mixer. A reference frequency signal from the output of the reference high-frequency generator is transmitted to the second input of the mixer. The search generator used is a highly stable LC generator without direct coupling if its frequency setting LC circuit with the active element of the generator.
EFFECT: high sensitivity with low current consumption.
3 dwg
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| 0 |
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SU398890A1 |
