The frequency domain method (FDEM) is a method that uses the inductive properties of a continuous primary electromagnetic field to measure the conductivity of the material through which the field passes. The material of the subsurface controls the ability to carry an electrical current and, therefore, these methods can be used identify lateral boundaries between different materials and lithology.
FDEM is used for the exploration of shallow base metal deposits and for many environmental and engineering applications.
FDEM is use for:
INSTRUMENTS & SOFTWARE
IES uses PROMIS, a slingram HLEM system using a transmitter loop to produce a primary magnetic field, linked by a cable to a receiver sensor located at a given spacing from the transmitter. PROMIS is available with one component (vertical) or with three components (vertical & two horizontal).
IES uses Maxwell software to process and interpret EM data. Maxwell is industry-standard for dealing with EM geophysical data whether it is time-domain, frequency-domain, ground or borehole.