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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Read MoreEVENTS
PDAC 2021
Join us virtually for the PDAC premier mineral exploration and mining convention between March 8-11, 2021.
AMEBC Remote Roundup 2021
Join us virtually at AME’s first Remote Roundup conference from January 18-22, 2021.
CCMEC 2019
Join us in Winnipeg on November 18 and 19 at the CCMEC conference.
AMEBC Roundup 2019
Please plan to visit us at our booth at the Roundup in Vancouver from January 28 to 31.
Dias at DMEC
Please join Dias Geophysical in the exhibition hall at the DMEC conference from October 22 to 25, 2017. Dias will be sharing a booth with Supracon AG for the duration of the conference. Glenn Chubak, Dias’ VP Technology, will be co-chairing the technical session on Ground and Borehole Geophysics on Tuesday morning, and Jonathan Rudd, Dias’ president, will be speaking on the Progress of the Electrical Resistivity and IP Method, also on Tuesday morning. Dias Geophysical is a proud sponsor of the event.
PDAC 2017
Dias Geophysical is exhibiting at the PDAC Conference from March 5 to 8. Please visit our booth # 6210N in the North Convention area.
AMEBC Roundup 2017
Join us at the Roundup from January 23-26, 2017, at our booth #1519.
ASEG Conference
Stop by the Dias Geophysical booth at the ASEG conference in Perth, Australia.
AMEBC Roundup
Join Dias Geophysical at our booth at the AMEBC Roundup conference in Vancouver.
KEGS Toronto
Dias presents an overview of the DIAS32 system at the KEGS monthly meeting in Toronto.
SEG Denver
Dias presents two papers at the 3D IP and Resistivity workshop at the SEG conference in Denver.
Tech Corner
Ground magnetotelluric (MT) measurements can be easily acquired using Dias’ DIAS32 3D DCIP system. We employ advanced processing techniques using linear regression and wavelet-based event
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