Array of Induction Receivers (WTI)
Description of the Method
The Array of Induction Receiver (AIR) system is based on electromagnetic induction measurement techniques and operates on the same basic principles as traditional handheld radio-detection devices. An electric current is induced in a subsurface utility line. The induced current produces a magnetic field that is detected at the surface. The AIR system provides 48 simultaneous magnetic field measurements over an 8 feet swath. The magnetic field data is typically collected on 1’ x 1’ grid spacing over the entire survey area. The position of the AIR system is tracked using an accurate positioning system such as a robotic laser tracking system which provides cm. position accuracies. The data is stored on a computer and then processed using advanced electromagnetic modeling techniques.