Superconducting Magnetic Tensor Gradiometer System for Detection of Underwater Military Munitions

Superconducting sensors and methods in geophysical applications

“…However, sensitive gradiometers in HTS are mainly realized either on the base of rotating structure [86] or on a flipchip type configuration e.g. [91][92][93]. where a chip with the pickup loops is rigidly mounted to a second chip which containing the SQUID structure itself.…”

“…• ground-based stationary and mobile e.g. for UXO, building soil analysis or archaeological investigations [92,117,118],…”

Constraining structural dip and magnetization direction of a sheet from its static and dynamic magnetic anomalies

“…With a high-T SQUID gradiometer system and integration times of 10-100 seconds, sensitivities of ~ 1 pT/m should be attainable, which should be sufficient to detect time-varying gradients for many anomalies. The full tensor magnetic gradiometer developed at CSIRO [Keenan et al, 2013;Billings et al, 2012] using a static arrangement of six high-Tc planar SQUID gradiometers on a hexagonal pyramid ,as shown in Figure 9, has a gradient field sensitivity of better than 2 pT/m/√Hz in unshielded stationary measurements. This system also incorporates a set of 3 axis SQUID magnetometers, with typical sensitivities of ~200 fT/√Hz, for background field referencing which additionally can be used to correlate to base station measurements.…”