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Geotech Ltd.
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  5. Impulse - Helicopter-Borne Frequency ...

Impulse - Helicopter-Borne Frequency Domain Electromagnetic System

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Impulse is a digital helicopter-borne frequency domain electromagnetic system developed by Aeroquest and Geophex. This innovative wideband system utilizes a single computer-controlled, high-output transmitter driver to power individual horizontal coplanar and vertical coaxial transmitter coils, producing a total of 3 fixed or up to 8 programmable frequencies (in each coil orientation). Impulse systems are designed to explore to depths of up to 100 m while providing high-resolution results in the very near-surface, and sensitivity in resistive geologic environments.

Impulse differs significantly from conventional multi-frequency systems in that the conventional systems use three independent coils per frequency (e.g. 18 coils for a conventional six frequency system versus 6 coils for Impulse). This approach minimizes noise from coil interaction. The multi-frequency operation using a single set of coils for each orientation provides many advantages such as simpler calibration, more predictable drift characteristics, inter-frequency spectral integrity, and a lighter tow body.