Preprints
https://doi.org/10.5194/gi-2021-19
https://doi.org/10.5194/gi-2021-19

  23 Jun 2021

23 Jun 2021

Review status: this preprint is currently under review for the journal GI.

A towed magnetic gradiometer array for rapid, detailed imaging of utility, geological, and archaeological targets

M. Andy Kass1, Esben Auken1,2, Jakob Juul Larsen3, and Anders Vest Christiansen1 M. Andy Kass et al.
  • 1Hydrogeophysics Group, Department of Geoscience, Aarhus University, Aarhus, 8000, Denmark
  • 2Geological Survey of Denmark and Greenland, Copenhagen, 1350, Denmark
  • 3Department of Electrical and Computer Engineering, Aarhus University, Aarhus, 8000, Denmark

Abstract. Efficient and accurate acquisition of magnetic field and gradient data have applications over a large range of environmental, archaeological, engineering, and geologic investigations. Developments in new systems and improvements in existing platforms have progressed to the point where magnetic surveying is a heavily used and trusted technique. However, there is still ample room to improve accuracy, coverage efficiency, and to include reliable vector information. We have developed a vector magnetic gradiometer array capable of recording high resolution field and gradient data over tens of hectares per day at 50 cm sensor spacing. Towed by an all-terrain vehicle, the system consists of 8 vertical gradiometer sensor packages, and incorporates differential GPS and an inertial measurement system. With a noise floor of around 6 nT at 15 km/h towing speed and 230 Hz sample rates, large areas can be mapped efficiently and precisely. Data are processed using a straightforward workflow, using both standard and newly developed methodologies. The system described here has been used successfully in Denmark to efficiently map buried structures and objects. We give two examples from such applications highlighting the system’s capabilities in archaeological and geological applications.

M. Andy Kass et al.

Status: open (until 26 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on gi-2021-19', Arne Døssing, 26 Jul 2021 reply

M. Andy Kass et al.

M. Andy Kass et al.

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Short summary
We have developed a towed magnetic gradiometer system for rapid acquisition of magnetic and magnetic gradient maps. This high resolution system is flexible and has applications to utility detection, archaeology, unexploded ordnance, or any other applications where high-resolution maps of the magnetic field or gradient are required. Processing of the data has been simplified as much as possible to facilitate rapid results and interpretations.