QFTMG – Full-Tensor Magnetic Gradiometry

QFTMG – Full-Tensor Magnetic Gradiometry

Introducing the QFTMG System

The QFTMG 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 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 10 years of development and testing, and has flown many successful exploration campaigns. The QFTMG system represents the full commercialization of this established system.

The QFTMG 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 QFTMG system can be deployed in most operating environments.

QFTMG 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.





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.


3D Survey in Czech Republic
December 17, 2018

Dias Geophysical completed a DIAS32 3D resistivity and IP survey over Declan Cobalt’s Tisová project in the Czech Republic. The property hosts polymetallic VMS mineralization

Dias Geophysical in Australia
May 30, 2018

Dias Geophysical has been operating in Australia for over 6 months, and has committed a full 3D system to the Australian market for the foreseeable

DIAS32 3D Survey for NexGen key to new South Arrow discovery
September 23, 2017

Dias Geophysical’s 3D survey over the Arrow Deposit in the western Athabasca basin, Saskatchewan, for NexGen Energy identified a new potential exploration target. The survey

Dias completes 3D resistivity and IP survey over NexGen Energy’s Arrow Deposit
November 2, 2016

Dias Geophysical is pleased to announce the completion of a 3D resistivity and IP survey over the Arrow deposit in the southwest Athabasca basin, Saskatchewan,

Dias completes project in northern Chile
July 12, 2015

Dias Geophysical has successfully completed an induced polarization and resistivity survey in northern Chile. The project was successful in identifying prospective targets for drill follow-up



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

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
February 15, 2015

Stop by the Dias Geophysical booth at the ASEG conference in Perth, Australia.

AMEBC Roundup
March 1, 2015

Join Dias Geophysical at our booth at the AMEBC Roundup conference in Vancouver.

KEGS Toronto
November 11, 2014

Dias presents an overview of the DIAS32 system at the KEGS monthly meeting in Toronto.

SEG Denver
October 31, 2014

Dias presents two papers at the 3D IP and Resistivity workshop at the SEG conference in Denver.