An apparatus and method is provided for detecting perturbations in the local magnetic environment. The apparatus comprises: a capacitance device including a first and second capacitive plate, the second capacitive plate being separated from a magnet section of the first capacitive plate by a distance; and a means for receiving a magnetic element on the magnet section of the first capacitive plate, wherein movement between the magnet section of the first capacitive plate and the second capacitive plate indicates a change in capacitance. Means for calculating the capacitance of the capacitance device, and means for determining a change in capacitance may be provided and on the basis of the change in capacitance, it is judged whether a permanent magnet is near the capacitance device.
申请公布号
WO2011141718(A2)
申请公布日期
2011.11.17
申请号
WO2011GB00741
申请日期
2011.05.13
申请人
ECOTEC SYSTEMS LTD;PULHAM, RICHARD;GODDARD, TRISTAN;CHAMPION, BARRY;SABIN, BARRIE;AGRATECH LTD