Geotech Airborne Limited Patent applications |
Patent application number | Title | Published |
20150268369 | CALIBRATED ELECTROMAGNETIC SURVEY SYSTEM - An airborne electromagnetic survey system that determines a calibration factor for its receiver system by combining low frequency sensitivity for its magnetic induction sensors, with measurements of high frequency response obtained using calibration loops | 09-24-2015 |
20140084930 | MONITORING THE DIPOLE MOMENT VECTOR OF AN AIRBORNE ELECTROMAGNETIC SURVEY SYSTEM - An airborne electromagnetic survey system that monitors the dipole moment. A TDEM system includes a flexible transmitter loop and a receiver having three sensors with mutually perpendicular sensitive axes. In flight, mechanical and aerodynamic forces cause the transmitter loop to tilt and flex, which affects the direction and magnitude of the primary field dipole moment. The processing system measures the sign and amplitude of the primary field sensed by the receiver in each of its sensitive axes and calculates a vector which represents the orientation of the primary field in the receiver frame of reference at the receiver location. Using this vector, the processing system determines the orientation of the primary field dipole moment. | 03-27-2014 |
20120293177 | RECEIVER COIL ASSEMBLY WITH AIR AND FERROMAGNETIC CORED SENSORS FOR GEOPHYSICAL SURVEYING - A receiver coil assembly for performing geophysical surveys, including a hollow outer shell defining a continuous internal passage that forms a loop; a multiturn receiver air coil extending around the continuous internal passage; and a first cored coil comprising multiturn solenoid windings about a ferromagnetic core, the first cored coil having a sensing axis in a different direction than a sensing axis of the air coil. | 11-22-2012 |
20110272522 | AIRBORNE TIME DOMAIN ELECTROMAGNETIC TRANSMITTER COIL SYSTEM AND APPRATUS - A tow assembly for an airborne electromagnetic surveying system, including: a transmitter coil frame supporting a transmitter coil, the transmitter coil frame being formed from a plurality of serially connected frame sections forming a loop, the transmitter coil frame having rotating joints at a plurality of locations about a circumference thereof enabling the transmitter coil frame to at least partially bend at the rotating joints; and a suspension assembly for towing the transmitter coil frame behind an aircraft, the suspension assembly being attached to the circumference of the transmitter coil frame at spaced apart locations. | 11-10-2011 |
20110148421 | Bucking Coil and B-Field Measurement System And Apparatus for Time Domain Electromagnetic Measurements - According to one example embodiment is a time domain electromagnetic (TDEM) geophysical survey system for producing a B-field measurement, comprising: a transmitter coil; a bucking coil positioned in a substantially concentric and coplanar orientation relative to the transmitter coil; a receiver coil positioned in a substantially concentric and coplanar orientation relative to the bucking coil; an electrical current source connected to the transmitter coil and bucking coil for applying a periodic current thereto; and a data collection system configured to receive a magnetic field time-derivative signal dB/dt from the receiver coil and integrate the magnetic field time-derivative signal dB/dt to generate, a magnetic B-field measurement, the transmitter coil, bucking coil and receiver coil being positioned relative to each other such that, at the location of the receiver coil, a magnetic field generated by the bucking coil has a cancelling effect on a primary magnetic field generated by the transmitter coil. | 06-23-2011 |
20110001480 | Airborne Electromagnetic Transmitter Coil System - A tow assembly for an airborne electromagnetic surveying system, comprising: a semi-rigid transmitter coil frame supporting a transmitter coil, the transmitter coil frame being formed from a plurality of serially connected frame sections forming a loop, the transmitter coil frame having articulating joints at a plurality of locations about a circumference thereof enabling the transmitter coil frame to at least partially bend at the articulating joints; and a suspension assembly for towing the transmitter coil frame behind an aircraft, the suspension assembly comprising a plurality of ropes and attached to the circumference of the transmitter coil frame at spaced apart locations. | 01-06-2011 |
20100052685 | BUCKING COIL AND B-FIELD MEASUREMENT SYSTEM AND APPARATUS FOR TIME DOMAIN ELECTROMAGNETIC MEASUREMENTS - The present invention relates to a HTEM system that includes a semi-rigid bucking coil and an algorithm to determine the magnetic field B from the measured signal dB/dt. The bucking coil may be positioned in a concentric coplanar manner relative to a transmitter coil and receiver coil, in order to minimize spurious signals at the receiver coil during data acquisition time. Signals gathered by the system may be further processed by a signal processing means. Moreover, measurements performed upon data generated by the system may be performed upon the entire period of a current waveform applied to the transmitter and bucking coils. | 03-04-2010 |
20090284258 | AIRBORNE GEOPHYSICAL SURVEY USING AIRSHIP - A method and system for geophysical surveying. A non-rigid airship having a self-supporting gas envelope and propulsion units coupled to the gas envelope, the propulsion units being configured to control the steering and altitude of the airship without the aid of a rudder or elevators, is provided with geophysical survey equipment, and geophysical data is collected while flying the airship. Also a method for geophysical surveying that includes providing a first airship with a first set of geophysical survey equipment, providing a second airship with a second set of geophysical survey equipment that is complimentary to the first set, and conducting an airborne geophysical survey by flying the first airship and the second airship along a designated flight path within a predetermined range of each other. | 11-19-2009 |
20090278540 | DOUBLE-SUSPENSION RECEIVER COIL SYSTEM AND APPARATUS - 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. | 11-12-2009 |
20090251146 | Detection of Porphyry Copper Deposit Using Natural Electromagnetic Fields - A method for identifying a possible porphyry copper deposit which includes flying an airborne sensor over a survey area measuring natural electromagnetic fields in the survey area, and then determining, in dependence on the measured natural electromagnetic fields, if one or more sub-areas in the survey area have a resistivity pattern that corresponds to a predetermined resistivity signature for a porphyry copper deposit. The predetermined resistivity signature includes a higher resistivity inner region at least partially surrounded by a lower resistivity outer region | 10-08-2009 |
20090212778 | LARGE AIRBORNE TIME-DOMAIN ELECTROMAGNETIC TRANSMITTER COIL SYSTEM AND APPARATUS - 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. | 08-27-2009 |