Qinetiq Limited

Quinetiq Limited

Mark Gregory Maylin

Jonathan Geoffrey Gore

Richard Carson McBride

Abdul-Salam Kaddour

Adrian Robert Bowles

George Jiri Tomka

Jeremy Leonard Clive Ludlow

Ahmed Yehia Amin Abdel-Rahman

James Carl Milne

Derek Atkinson

Patrick T Squire

Jeremy Leonard Ludlow

Richard Carson Mcbride

David Gordon Madgwick

Ahmed Yehia Abdel Rahman

Ahmed Yehia Amin Abdel Rahaman

A high pressure pump for use in the injection of liquid chemicals into subsea oil or gas wells, and intended to be positioned in the subsea environment adjacent to the wellhead, comprises a piezoelectric actuator () for reciprocating a plunger () which acts to compress and expand the effective volume of a pumping chamber () having a valved inlet () connected to a source of the liquid and a valved outlet () to lead the liquid to the well. The device has a minimum of moving parts and in particular avoids the need for any rotating parts and attendant high performance bearings and seals.

Subsea chemical injection system and pumps therefor

A stress or magnetic field sensor comprising a generally elongate magnetically soft amorphous or nanocrystalline electrically resistive element and biasing means for applying to the element a bias magnetic field of which the component directed along the length of the sensor has an amplitude variation pattern along the element. A periodically varying pattern has the effect of reducing the sensitivity of a stress sensor to external ambient fields (FIG.shows that with a sawtooth bias field the sensitive portions a of a sensor move to positions b in the presence of an ambient field, but their number remains the same). A ramped bias field enables the position of the sensitive region of the sensor to be controlled, for measuring local stress, or for mapping an external magnetic field. Control of the regions where the sensor is active may include selective conductive coating of portions of its length. Potential uses of the stress sensor include a pressure sensor, embedment in moving parts (using rf communication) such as vehicle tyres, aircraft wings or machine parts, and in structures such as bridges where stray magnetic fields are a problem.

Stress or magnetic field sensor with spatially varying bias

An integrating magnetic sensor is described which comprises a sensor element made from a filament of substantially amorphous material which exhibits giant magneto-impedance and means for applying a bias field to the said sensor element so that it operates in the high field section of the giant magneto-impedance response.

Elongate GMI integrating magnetic sensor

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Farnborough, United Kingdom

Mark Gregory Maylin