Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-02-19
1977-04-05
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 41, G01V 308
Patent
active
040164861
ABSTRACT:
Circuitry for detecting buried non-metallic and metallic land mines is diosed. A peak detector receives signals from a conventional search head. The output of the peak detector is amplified and this amplified signal is applied to a slope determination channel, to a pulse width determination channel and to a pulse amplitude determination channel. The output pulses from the slope determination channel, the pulse width determination channel and the pulse amplitude determination channel are all applied to different inputs of an AND gate. If pulses are coincidently present on all the inputs of the AND gate, the AND gate provides an output pulse which is applied to a field effect transistor (FET) switch. The FET switch controls the gain of an amplifier such that the gain of the amplifier is measurably increased when the AND gate applies a pulse to the FET switch. When the gain of the amplifier is increased by the FET switch, a signal burst indicating that a mine has been detected is produced on the output of the amplifier. The output from the amplifier is typically coupled to a headset worn by the person conducting the search.
REFERENCES:
patent: 2012479 (1935-08-01), Planta
patent: 2744232 (1956-05-01), Shawhan et al.
patent: 2768347 (1956-10-01), Hansen
patent: 3701029 (1972-10-01), Hogg
patent: 3790883 (1974-02-01), Bergegere
patent: 3820019 (1974-06-01), Doty et al.
patent: 3826973 (1974-07-01), Pflaum
patent: 3835371 (1974-09-01), Mirdadian et al.
patent: 3836842 (1974-09-01), Zimmermann et al.
Edelberg Nathan
Strecker Gerard R.
The United States of America as represented by the Secretary of
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