QMAGT – Full-Tensor Magnetic Gradiometry
Introducing the QMAGT System
The QMAGT system is a helicopter-borne magnetic survey system which measures the magnetic field in a more robust and detailed manner. The SQUID (superconducting quantum interference device) sensor system measures the complete gradient tensor (otherwise known as full-tensor magnetic gradiometry (FTMG)) of the earth’s magnetic field. This FTMG measurement provides directional information about the magnetic field. This directional information is not available from total field sensors, which have been the industry standard for many years.
The SQUID sensors are developed by Supracon AG of Jena, Germany. Operating within a liquid helium bath, the sensors measure the magnetic field with unrivaled sensitivity. The sensor system is the result of over 20 years of development and testing, and has flown many successful exploration campaigns. The QMAGT system represents the full commercialization of this established system.
The QMAGT system is deployed in a custom-built airfoil beneath a helicopter. This ‘bird’ effectively reduces motion noise, allowing for the recovery of high quality data. As a lightweight system, the QMAGT system can be deployed in most operating environments.
QMAGT Advantages:
- Plug and play helicopter operation for acquisition in most environments.
- Direct determination of anomaly geometry, irrespective of whether the source is remanent or induced.
- Better information on magnetization directions. The magnetic moment of compact sources can be directly determined.
- Gradient measurements, particularly full tensor measurements, determine on which side of a survey line a source lies.
- Redundant tensor components (4 of the 9 measured tensors are redundant) give inherent error correction and noise estimates.
- Desirable mathematical properties, allowing magnetization mapping, rigorous continuation, reduction to the pole, depth slicing, invariants, etc.
Specifications
SQUID sensor: 6-channel first-order planar gradiometers
Intrinsic gradient noise: <100 fT / (m√Hz)
Magnetometer: 4-channels of magnetometers
Intrinsic noise: 2 pT / √Hz
SQUID electronic bandwidth: > 3 MHz
Sampling Rate: 10,000 samples per second
Operating temperature range: -10°C to +70°C
Cryostat operation: 2.5 days per refill
Data acquisition: 20 channels of 24 bit ADCs
IMU system: 3 fibre optic gyros, 3 accelerometer sensors
Radar altimeter: max of 3 % or 0.5 m
Laser altimeter: +/- 1 to 2 cm typical
Total bird weight: 130 kg
Tow rope: DyneemaTM – 32 m +
Knowledge through innovation and resolve
Dias delivers unique geophysical solutions to geoscience challenges through the application of innovative technologies. Dias offers induced polarization and resistivity survey services using its proprietary DIAS32 system, a uniquely efficient and effective technology. Dias provides full tensor magnetic gradient survey services using the SQUID-based FTMG system in partnership with Supracon AG.
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