Application of high-temperature superconductor SQUIDs for ground-based TEM

Leslie, Keith; Binks, R. A.; Lam, Siu Shu Eddie; Sullivan, Pierre E.; Tilbrook, David; Thorn, R. G.; Foley, C. P.

doi:10.1190/1.2831682

Cited by 24 publications

(18 citation statements)

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“…Unlike traditional EM surveys that measure the time derivative of the magnetic field (dB/dt) using coils, this survey directly measures the magnetic field (B) using a SQUID (superconducting quantum interference device) magnetometer. A SQUID has very low internal noise and is able to measure small magnetic signals to very high precision (Chwala et al, 2011;Leslie et al, 2008). This advantage allows the EM survey with a SQUID to record time-domain data at very late times for deep target.…”

Section: Discussionmentioning

confidence: 99%

3D conductivity models of Lalor Lake VMS deposit from ground loop and airborne EM data sets

Yang

Oldenburg

2013

ASEG Extended Abstracts

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Section: Discussionmentioning

confidence: 99%

3D conductivity models of Lalor Lake VMS deposit from ground loop and airborne EM data sets

Yang

Oldenburg

2013

ASEG Extended Abstracts

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“…Discovery International Geophysics uses a SQUID successfully in TEM deep exploration (Woods, 2010). A high-temperature SQUID (HTS) was developed at the CSIRO (Osmond et al, 2002) and is being used by Crone Geophysics (Leslie et al, 2008). Malo-Lalande (2007) described a fixed-loop configuration that generates a strong horizontal primary field that is ideal for investigating steeply dipping and deeply buried base-metal targets.…”

Section: Case Histories For Mine-environment Problemsmentioning

confidence: 99%

Metalliferous mining geophysics — State of the art after a decade in the new millennium

2011

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Mining exploration was very active during the first decade of the twenty-first century because there were numerous advances in the science and technology that geophysicists were using for mineral exploration. Development came from different sources: instrumentation improvements, new numerical algorithms, and cross-fertilization with the seismic industry. In gravity, gradiometry kept its promise and is on the cusp of becoming a key technology for mining exploration. In potential-field methods in general, numerous techniques have been developed for automatic interpretation, and 3D inversion schemes came into frequent use. These inversions will have even greater use when geologic constraints can be applied easily. In airborne electromagnetic (EM) methods, the development of time-domain helicopter EM systems changed the industry. In parallel, improvements in EM modeling and interpretation occurred; in particular, the strengths and weaknesses of the various algorithms became better understood. Simpler imaging schemes came into standard use, whereas layered inversion seldom is used in the mining industry today. Improvements in ground EM methods were associated with the development of SQUID technology and distributed-acquisition systems; the latter also impacted ground induced-polarization (IP) methods. Developments in borehole geophysics for mining and exploration were numerous. Borehole logging to measure physical properties received significant interest. Perhaps one reason for that interest was the desire to develop links between geophysical and geologic results, which also is a topic of great importance to mining geologists and geophysicists.

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“…Over the past 20 years, CSIRO has developed superconducting sensor systems for TEM prospecting [29]. CSIRO has licensed a product, known as LANDTEM, which is widely used for the detection and delineation of highly conducting ore bodies such as nickel sulphides, silver and gold [29]. Figure 5 shows a schematic of the way TEM is undertaken in the field.…”

Section: Geomagnetic Explorationmentioning

confidence: 99%

High-<i>T<sub>c</sub></i> Superconducting Electronic Devices Based on YBCO Step-Edge Grain Boundary Junctions

Keenan

Mitchell

et al. 2013

IEICE Trans. Electron.

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We outline a number of high temperature superconducting Josephson junction-based devices including superconducting quantum interference devices (SQUIDs) developed for a wide range of applications including geophysical exploration, magnetic anomaly detection, terahertz (THz) imaging and microwave communications. All these devices are based on our patented technology for fabricating YBCO step-edge junction on MgO substrates. A key feature to the successful application of devices based on this technology is good stability, long term reliability, low noise and inherent flexibility of locating junctions anywhere on a substrate.

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Application of high-temperature superconductor SQUIDs for ground-based TEM

Cited by 24 publications

References 0 publications

3D conductivity models of Lalor Lake VMS deposit from ground loop and airborne EM data sets

3D conductivity models of Lalor Lake VMS deposit from ground loop and airborne EM data sets

Metalliferous mining geophysics — State of the art after a decade in the new millennium

High-<i>T<sub>c</sub></i> Superconducting Electronic Devices Based on YBCO Step-Edge Grain Boundary Junctions

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