Utility Survey Corp.

EM Induction Profiling

EM Profiling - The Methodology 

How is Electromagnetic Induction Profiling done? What should you know about the service you will be getting, when looking for large objects, such as Underground Storage Tanks (UST's) and drums?


Phase 1 - EM Area Scan: The first phase will be to scan the designated survey area with a GSSI Georeferenced Profiler EMP-400 Electromagnetic Induction Instrument. The Profiler and previous generation technology of this nature are commonly referred to as EM instruments.

This first scanning phase will generate georeferenced, colored, contour-type, data maps showing the location of potential targets of interest. These target areas will then be investigated further in Phase 2 to try and determine their physical nature, approximate size, and depth.  

Phase 2 - GPR & FM Localized Investigation: The second phase will be to carry out a localized investigation of target areas of interest revealed during the Phase 1 Profiler scanning.

An intensive localized scanning will be performed at each target area of interest using both GPR (Ground Penetrating Radar) and an FM instrument (Ferro-Magnetic Center-Mass Metal Detector).

The purpose of this second phase will be to try and determine the nature of the targets shown on the maps generated by the Profiler scanning. The GPR will be used to determine the approximate size and depth of the targets.

The FM instrument will be used to determine if the targets are made of a ferrous metal such as is typically used in the manufacture of steel drums and underground storage tanks (USTs) etc.

Any target “seen” with the GPR that does not generate a tone when scanned with the FM instrument will be assumed to be of a non-ferrous nature. 

Find out more about the methodology used in our "10-Step Profiler Protocol". 

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