Complex airborne geophysical surveys are the most effective method of investigation for large-sized hard-to-reach areas.
Impulse-A5/A6 series helicopter systems for airborne electromagnetics, as a part of methods for airborne geophysical surveys, are capable to provide depths of investigation down up to 300-500 m and could be used for solving of different search and exploration tasks for ore objects, kimberlites and also for localization of epigenetic zones over hydrocarbon reservoirs, and for the tasks of structural geomapping, engineering geophysics and hydrogeology.
|Carrier frame||sectional polygon|
|Diameter of a platform||14.2/20 m|
|Nominal survey speed||100 km/h|
|Platform flight height||30-50 m|
|Wind speed, no more||10 m/sec|
|Tow-cable length||50 m|
|Platform full weight||510/700 kg|
|Transmitter loop||horizontal, multi-turn|
|Number of turns||2-4|
|Inductor area||160/314 m2|
|Current pulse shape||square-shaped|
|Current pulse amplitude||up to 250 A|
|Dipole moment||up to 3⋅105 A⋅m2|
|Max. pulses repetition rate||up to 100 Hz|
|Power consumption||3 kW|
|Continuous operation time||6 hours|
|Measurement signal||dBz/dt from 4 sensors|
Additional channels (option):
- CS-3 magnetometer;
- RS-500 spectrometer (up to 48 L).
1. Double-circuit way of excitement of the electromagnetic field for increasing the amplitude of a spectrum of the pulse on high frequencies of a spectrum.
The first transmitter loop is for high-energy excitement of the medium with amplitudes of current up to 250 A, the second transmitter loop – for work with low current (10A) and the short decay time of current switch off that allows to receive a useful signal on early times (from 6-8 mks) and to increase reliability of parametrization of the top part of geoelectrical section.
2. Dividing of measured signal on induction and polarization components that allows to increase accuracy of EM soundings and to obtain additional interpretation parameter – polarizability.
3. Simple assembling and operating with the system.
Power spectra of sounding pulses for different TEM helicopter systems
Photo 1. “Impulse-A7”
Photo 2. “Impulse-A7”. A view from Mil-171 hatch
Photo 3. “Impulse-A7”. A view from Mil-171 hatch
Photo 4. “Impulse-A7”. A view from Mil-8T hatch
Photo 5. “Impulse-A7”. A view from hatch. “Missile” of magnetomter is seen (red)
Photo 6. A view near hatch of Mil-8-MTV. Tow-cable with connectors
Photo 7. A view near hatch of Mil-8-MTV. Tow-cable with defence
Photo 8. “Impulse-A” transmitter with power batteries installed
Photo 9. “Impulse-A” transmitter with power batteries installed on a board
Photo 10. Fuselage bottom. Frame of radar altimeter antennas. Tow-cable defence
Photo 11. GPS equipment (route screens) in a pilots cabin
Photo 12. Parts of platform frame packed for transportation
Photo 13. Operator’s stand (frame) in AS350B3 helicopter
Photo 14. Operator’s stand (frame) in AS350B3 helicopter