The Secretary of State for Defence in Her Britannic Majesty's Government

Qinetiq Limited

The Secretary of State for Defence

Julian S Satchell

Richard George Humphreys

Mark N Keene

Huw D Rees

Nigel G Chew

A passive mm-wave imager comprises an optical immersion lens arrangement which is illuminated by front end optics and an array of detectors () to () located in the focal plane of the immersion lens arrangement. The detectors comprise antennae coupled high temperature superconductor weak links, in particular C-axis cross-over or step microbridges.

Mm-wave terrestrial imager

A gradiometer for measuring properties of a magnetic field and in particular, for measuring magnetic field gradient components, comprising at least two magnetic sensors wherein at least two of the magnetic sensors are arranged to sense the magnetic field component in substantially the same direction. The magnetic sensors may be super conducting quantum interference device (SQUID) magnetometers, Hall probes, flux gates or magneto-resistive magnetometers. The gradiometer also includes a computer processor loaded with an adaptive signal-processing algorithm, for performing adaptive signal balancing of the magnetometer outputs. In a preferred embodiment the gradiometer may comprise at least eight magnetometers in a three-dimensional arrangement, and a set of three orthogonal global feedback coils, one for each direction x, y, z, such that the five independent magnetic field gradient components may be measured. The gradiometer may also be used to measure second or higher order magnetic field gradient components.

Magnetic gradiometer incorporating global feedback

Superconductive junction

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Malvern, United Kingdom

Julian S Satchell