Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-08-24
1978-05-02
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01V 318
Patent
active
040877418
ABSTRACT:
A simple geoelectric remote sensing cable comprising a single current electrode and a relatively large number of sensing, or potential, electrodes. The current electrode is at the center of the logging cable and the sensing electrodes are arranged symmetrically about the current electrode in such a manner that the spacing between adjacent sensing electrodes increases with distance from the current electrode. In the preferred embodiment, the sensing electrode spacings are all integral multiples of a basic interval unit, such as two and one-half feet. The cable is pulled from the bottom of a borehole to the top at a fixed rate while a fixed current is supplied to the current electrode and the voltage differences between each adjacent pair of sensing electrodes are recorded after each movement of a distance equal to the basic interval or an integral fraction thereof. In the preferred embodiment, four-point electrode type of resistivity calculations are then made using the recorded data and the superposition principle.
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patent: 3838335 (1974-09-01), Miller
McIlroy Arthur
Metrailer Albert C.
Standard Oil Company (Indiana)
Strecker Gerard R.
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