Colloque

GEOTEM, a new airborne transient EM system

S. Thomson

Membre a labase

S. Thomson

Résumé du colloque

The operation of a towed bird time domain electromagnetic system involves the measurement of decaying secondary electromagnetic fields induced in the ground by a series of short pulses of current generated from an aircraft mounted transmitter. Variation in the decay characteristics are analyzed and interpreted to provide information about the subsurface structure. GEOTEM is a time domain towed bird electromagnetic system incorporating a high speed digital EM receiver. Advantages of the system include digital calibration in real time and the lack of receiver noise or level drift. A systematic approach to the processing of results from numerous field surveys has been undertaken in the last two years. The use of digital data processing techniques demonstrates the superiority of digital data recovery to that of traditional analogue airborne time domain systems. Advantages for the end user include significant increases in depth investigation, lateral resolution and response bandwidth.

Contexte

Section :

Géophysique

Thème du colloque :

Géophysique

Hôte : Université d’Ottawa

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GEOTEM, a new airborne transient EM system

S. Thomson