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Data acquisition

GeoTest is a software for controling geoelectric equipment in combination with many electrodes. This type of geoelectric measurement is called "Multielectrode Geoelectrics". Using two-dimensional or three-dimensional inversion techniques additionally for evaluation, this method is known as "Geoelectric Tomography".

GeoTest runs on desktop or notebook PCs with Windows 95 ^(TM) or later operating systems. The hardware specifications are not critical. Recommended minimum RAM is 512 MBytes. Depending on the kind of geoelectrical equipment, specific interfaces (RS232, USB) are needed.
 

Hardware

GeoTest supports hardware manufactured by “LGM - Lippmann Geophysical Equipment”:

• 4-point light hp / 4-point light 10W: a high power, low cost induced polarization earth resistivity meter in a small package: for Schlumberger soundings up to L/2 = 1 km; for mapping, monitoring, geoelectric tomography, lab work, induced polarization measurements, archeology
• ActEle: active electrodes for electrical resistivity tomography with direct interface for 4point light hp / 10W. Can be used to upgrade existing earth resistivity meters to state-of-the-art tomography systems.
  Supports up to 255 electrodes for profiling lengths up to appr. 1000 m.

We recommend the inversion software Res2DInv and Res3DInv for interpretation of geoelectric tomography measurements.

• Res2DInv supports 2-dimensional depth sections.
• the “Res2DInv only” license includes limited use of the Res3DInv 3D inversion program
• Res3DInv supports 3-dimensional investigations
• Supports on land, underwater and cross-borehole surveys
• Supports the Wenner (alpha,beta,gamma), Wenner-Schlumberger, pole-pole, pole-dipole, inline dipole-dipole, equatorial dipole-dipole and non-conventional arrays.
• Supports exact geometry factors in case of 2-electrode or 3-electrode configurations
• Supports exact and approximate least-squares optimisation methods
• Supports smooth and sharp contrasts inversions
• Supports up to 16000 electrodes and 21000 data points on computers with 1GB RAM
• Seamless inversion of very long survey lines using sparse inversion techniques
• Supports topography

Interested? Please ask us.