Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-06-02
1978-01-24
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01V 310
Patent
active
040706125
ABSTRACT:
Apparatus is provided which may be made portable and is calibrated to provide direct readings of terrain conductivity. Transmitter and receiver coils are separated by less than one tenth of the electrical skin depth in terrain having a maximum conductivity to be measured, at the frequency of alternating current signal applied to the transmitter coil, and the signals picked up by the receiver coil are processed to cancel received signal components in phase with the transmitted signal and amplify a received quadrature component so as to provide a direct indication of ground conductivity. The in-phase component received direct from the transmitter coil is cancelled by a preset equal and opposite component, and the in-phase component of the secondary signal received from the terrain is substantially cancelled by a form of negative feedback, in order to avoid swamping of the wanted signal. Optionally, the negative feedback is disabled and the in-phase component is displayed in order to provide an indication of the magnetic susceptibility of the terrain being surveyed.
REFERENCES:
patent: 3052837 (1962-09-01), Arbogast et al.
patent: 3214686 (1965-10-01), Elliot et al.
patent: 3259838 (1966-07-01), Thomsen
patent: 3555409 (1971-01-01), Atwood et al.
patent: 3609522 (1971-09-01), Hutchins et al.
patent: 3614600 (1971-10-01), Ronka
patent: 3758848 (1973-09-01), Dowling
patent: 3826973 (1974-07-01), Pflaum
Black Gary George
Bosnar Miroslav
McNeill James Duncan
Geonics Limited
Strecker Gerard R.
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