Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-02-26
1976-10-05
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 7, G01V 312, G01V 318
Patent
active
039847586
ABSTRACT:
A method and apparatus for geophysical exploration which does not require the installation of a low frequency transmission source in the proximity of the drill hole.
A surface pick-up 3 detects the magnetic field component of a low frequency signal, which, after amplification and filtering, is supplied as one input of a comparator 9. A pick-up 7 disposed in a drill hole detects the corresponding magnetic field components within the earth, and its output is supplied as the other comparator input. The amplitude ratios of the signals and their phase difference are provided at the outputs of the comparator. These values make it possible to determine the resistivity variations of the ground.
The extent of the detected conductivity layer(s) may be determined by repeating the operation using a second low frequency transmitter positioned at a different azimuth angle from the first, and comparing the output readings.
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Bureau de Recherches Geologiques et Minieres
Strecker Gerard R.
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