Jessy Star
QMAGT is the new brand name for the system that was formerly called FTMG or JESSY STAR. For marketing this breakthrough full tensor magnetic gradiometer technology Supracon has partnered up with Canadian DIAS Geophysics company and formed a joint venture DIAS Airborne.
QMAGT is the world's only available measurement system for airborne measurements of the complete Earth´s magnetic field gradient tensor, using at least 5 individual sensors (gradiometers) to acquire complete information on spatial magnetic field variations. The system is optimized for passive acquisition of magnetic information over large areas. Previous versions, like the mentioned JESSY STAR, have already completed thousands of flight hours in measurement modes based on helicopters and fixed-wing arrangements.
The system is qualified for passive and non-contact subsurface investigation by means of magnetic gradients and provides an innovative basis for the localization and quantification of structures embedded in the subsurface by means of modeling and inversion.
System parameters
| Parameter | QMAGT |
|---|---|
| Type of sensor | Gradiometers and magnetometers |
| Acquired parameter | 5 independent magnetic tensor components 3 orthogonal magnetic field components |
| Read-out mode | Analog |
| Bandwidth (elektronics) | 5 MHz |
| Slew rate | 2 MΦ0 /s |
| Noise level | <100fT/(m sqrt(Hz))@Laboratory <10pT/m@Survey |
| Dynamic range | 153dB (±220Φ0) ≈ 1e7.5 |
| Power Supply | PSU (own Battery), |
| Cryogenics | Helium cryostat, 72h holding time |
| Data acquisistion unit (DAS) | System specific, self-developed |
| Data acquisistion platform | towed body for helicopter-based operation, adaptable to other applications |
| Weight | 25kg (cryostat, DAS, periphery) |
| Accessories | GPS, altimeter, Inertial unit, helium transfer equipment |
| Survey conditions (system) | -40 °C … 50 °C, max. 90 % Air humidity |