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Redcliffe Limited

David Geraint Rhys Jones

Paul Cox

Pascual Ian Nicholson

Richard James Millard

An apparatus for measuring the magnetic field distribution of a magnetic sample includes a magnetic field sensor arrangement having three, orthogonally-disposed, Hall sensors for sensing the magnetic field produced by a magnetic sample at a given location, The sensor arrangement is scanned along a predetermined scan pattern. The apparatus then acquires sampling data from the sensor arrangement, the sampled data providing a representation of the magnetic field distribution of the magnetic sample. The data is preferably acquired by an interface card for a PC, which stores sampled data in the main memory of the PC for data analysis and display.

Apparatus and method of measuring the multi-dimensional magnetic field distribution of a magnetic sample in real-time

A tamper proof closure ( ) has a plurality of magnetic strips ( ) attached thereto which are arranged to be broken if the closure is opened. The broken magnetic strips have a different magnetic characteristic as compared to when they are intact and this can be sensed with a Hall effect or other sensor. The tamper proof closure enables the condition of article closures such as the screw caps of liquor bottles to be remotely monitored.

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Bristol, United Kingdom

David Geraint Rhys Jones