Time-domain electromagnetic geophysical mapping instruments

Details Time-domain electromagnetic geophysical mapping instruments Time-domain electromagnetic geophysical mapping instruments

1996-05-29

1998-08-18

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324239, 324330, G01V 310, G01V 3165, G01V 316

Patent

active

057962537

ABSTRACT:
In a time domain electromagnetic mapping technique of the type using transmitter pulses of half-sinusoidal waveform, with the half sinusoids being segments of a sinusoidal waveform having a frequency and corresponding to a resonant frequency of the transmitter coil, an improved current fall time at the end of each pulse is obtained by forming each transmitter pulse of plural immediately successive half sinusoids, the transmitter coil being tuned to an appropriately increased resonant frequency relative to the pulse repetition rate. Circuits for generating the improved pulse waveforms are disclosed.

REFERENCES:
patent: 3317744 (1967-05-01), Geleynse
patent: 3991363 (1976-11-01), Lathrop
patent: 4775832 (1988-10-01), Pecukonis
patent: 4896117 (1990-01-01), Floweredew et al.
patent: 5467011 (1995-11-01), Hunt
patent: 5498958 (1996-03-01), Tu et al.

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