Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1968-11-06
1976-08-31
Wilbur, Maynard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01V 310
Patent
active
039783960
ABSTRACT:
There is disclosed a method and apparatus for measuring electromagnetic conductivity within a medium to thereby derive a measurement of the rate of propagation of a magnetic field therein. If one then measures the return time of a pulse transmitted in the medium when a conductivity anomaly is encountered which creates a reflection, a magnetic diffusion radar can be calibrated. This technique enables one to measure the conductivity of a propagation medium such as salt water, earth or the like for any desired purpose such as determining the salinity of sea water or river water. More particularly, however, this enables one to make such a measurement in order to provide an electromagnetic anomaly detector such as is used in metal locaters, mine detectors, and in geophysical prospecting or exploration. The technique disclosed herein uses a detector designed to operate in the conducting medium, that is, in the ocean underwater or underground and further uses magnetic fields from a pulse source rather than from a continuous sinusoidal electromagnetic signal. Suitable transmitting and receiving coils are provided to generate such pulsed magnetic fields and to detect reflections therefrom caused by anomalies in the conducting medium. The signals induced in the receiving coil by these reflections are processed to provide not merely an indication of the existance of the anomaly but also a measure of its distance from the measuring apparatus.
REFERENCES:
patent: 2963646 (1960-12-01), Hicks et al.
patent: 3021481 (1962-02-01), Kalmus et al.
patent: 3090910 (1963-05-01), Moran
patent: 3350634 (1967-10-01), Hoehn
patent: 3412323 (1968-11-01), Unterbereer et al.
Altshuler Saul
Inouye George T.
Anderson Daniel T.
Blum T. M.
Dinardo Jerry A.
Oser Edwin A.
TRW Inc.
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