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The Very Early Time Electromagnetic (Vetem) System: First Field Test Results
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 9th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, Apr 1996, cp-205-00008
Abstract
The very early time electromagnetic (VETEM) system is a time-domain, surface-deployed system<br>that has potential applications to direct detection of non-aqueous phase liquids as well as to the<br>detection of buried objects. It is designed to operate in environments that are too conductive for<br>ground penetrating radar (GPR) to be effective, and too shallow for standard electromagnetic<br>systems. The VETEM system is a faster profiling complement to the frequency-domain high<br>frequency sounder (HFS).<br>First field tests of the VETEM were made at the Geophysics Performance Evaluation Range at<br>Rabbit Valley west of Grand Junction, Colorado in June and July, 1995. A number of well<br>defined targets of various types are buried there (Allen, 1995). The VETEM system was next<br>used as part of the Electromagnetics Integrated Demonstation (EMID) at the Cold Test Pit at the<br>Idaho National Engineering Laboratory (INEL) in November, 1995. The Cold Test Pit has a<br>number of subareas with buried objects of various types. For the EMID tests, VETEM was run<br>over three gridded areas: the Primary Grid (PG), the Large Object Pit (LOP), and the Calibration<br>Cell (CC). In this paper we display recorded lines from the LOP that show VETEM is<br>responding to electrical properties of the near surface and to buried objects.