Transient electromagnetic prospecting apparatus possessing noise

Details Transient electromagnetic prospecting apparatus possessing noise Transient electromagnetic prospecting apparatus possessing noise

1978-07-20

1981-01-27

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

G01V 310

Patent

active

042478219

ABSTRACT:
A transient electromagnetic signal transceiver for use in geophysical prospecting includes cultural noise and random noise reduction features. AC mains interference signals are minimized by synchronizing the reception of TEM signals with the mains frequency so that the mains interference components of alternate TEM signal measurements cancel. Other cultural noise is minimized by using low pass filters tuned to reject VLF radio signals. Common mode signal rejection, sferics suppression and signal stacking and averaging techniques improve the signal-to-noise ratio of the received TEM signals, while the use of a programmed microprocessor enables overall control of the transceiver to include the calculation and presentation of ground conductivity and other data.

REFERENCES:
patent: 3315155 (1967-04-01), Colani
patent: 3395338 (1968-07-01), Barringer
patent: 3538430 (1970-11-01), Bulgakov et al.

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