Pulsed field system for detecting the presence of a target in a

Details Pulsed field system for detecting the presence of a target in a Pulsed field system for detecting the presence of a target in a

1979-04-23

1991-06-18

Blum, Theodore M.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

G01V 308, G01V 310, G01V 312

Patent

active

050252186

ABSTRACT:
In a method and apparatus for searching a subsurface environment to detect he presence of a target therein, an electromagnetic field is emitted which comprises successive electromagnetic pulses of selected duty cycle, the time interval between pulses comprising a zero emission interval and a sampling interval, the sampling interval following the zero emission interval, and the polarity of the pulses of the emitted field alternating at a selected alternating frequency. The emitted field is projected into the environment from a selected location, and the electromagnetic field proximate to the selected location is sampled during each of the sampling intervals to provide a train of proximate field samples. The train of proximate field samples is spectrum analyzed to determine whether or not the field proximate to the selected location contains a component having a frequency which is equal to the alternating frequency.

REFERENCES:
patent: 3852659 (1974-12-01), Barringer

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