Patent ID: 7441464

Claim:
A strain gauge sensor system for measuring strain in a member, said system comprising: a sensor target assembly for carrying on said member, said sensor target assembly comprising at least one pair of adjacent first and second magnets spaced apart by a gauge length; and a first sensor device and a second sensor device for respectively magnetically sensing said first and second magnets; wherein said first sensor device is fixed spaced apart from said second sensor device, such that, in use, relative motion between said member carrying said sensor target assembly and said first and second sensor devices causes said first and second sensor devices to sense said first and second magnets, respectively, and to thereby generate first and/or second position signals representing the position of said first and/or second magnets and therefore the strain in said gauge length and wherein said first and second devices are interconnected such that said first position signal triggers operation of said second sensor device to generate said second position signal.