Abstract: The present invention is a double-suspension receiver coil apparatus and system for conducting electromagnetic surveys including, both ground-based and airborne measurements. The present invention includes at least one receiver coil suspended by way of first suspension members within an inner frame and said inner frame being suspended by second suspension members within an inner ring which is further enclosed within an outer frame. The double-suspension receiver coil apparatus functions so as to maintain the receiver coil position while minimizing vibrations in order to achieve a high signal-to-noise ratio and enable accurate measurements. The receiver coil may be in an airborne system in a near-horizontal position or in a ground system in a vertical position.

Abstract: An airborne time domain electromagnetic survey system is provided. The system and apparatus of the present invention are able to address the interest in exploring base metals and uranium deposits at depths approaching 1 kilometer. It encompasses a transmitter coil having a large magnetic dipole moment, flight stability, which is light weight, compatible with small helicopters, and can be transported, setup and repaired in the field. It is of a semi-rigid modular structure that can decrease the incidence of damage or breakage during take-off or landing in rough terrain.

Abstract: A suspension net is provided for distributing tension forces from a tow rope to an electromagnetic bird used for geophysical surveying. The suspension net allows large transmitter loop sizes, and the net structure generally avoids rope confusions that can occur during lift-up.

Abstract: An airborne time domain electromagnetic surveying system is provided. The system includes a tow assembly with a flexible support frame. The flexible support frame spaced apart from the aircraft includes a transmitter section with a transmitter loop and a receiver section with a sensor aligned with the central axis of the transmitter section. The flexible support frame has a lightweight modular structure that enables the surface area of the transmitter section to be increased and decreased to suit particular survey applications. The transmitter loop sends a pulse in an “ON” interval, and in an “OFF” interval the sensor measures the earth response to the pulse. The tow assembly also includes a sensor for generating selected survey data in the “ON” interval. A transmitter driver enables the creation of earthbound pulse. The system components are linked to a computer and control computer program linked thereto for controlling the functions thereof.

Abstract: A system, computer product and method for generating geophysical data is provided. At least one airborne sensor unit is provided which measures low frequency natural electromagnetic fields. Geophysical data is extrapolated from the tilt angles of the electromagnetic field by a computer running a data processing application. The system further includes a spatial attitude detection facility. The data processing application filters out distortions to the tilt angles caused by movement of the airborne sensor unit. The system further includes facilities for filtering out electronic noise.

Abstract: A system, computer product and method for generating geophysical data is provided. At least one airborne sensor unit is provided which measures low frequency natural electromagnetic fields. Geophysical data is extrapolated from the tilt angles of the electromagnetic field by a computer running a data processing application. The system further includes a spatial attitude detection facility. The data processing application filters out distortions to the tilt angles caused by movement of the airborne sensor unit. The system further includes facilities for filtering out electronic noise.