Thanks for your reply. Well, my source signal does change with temperature but I am able to deal with that in a different way. The temp coefficient of gain in the instrumentation amplifier I have verified by heating and cooling the device. The effect is small and cannot be observed on a scope of the output. However, after detection and amplification it is large enough to be a problem.
Thanks.
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Just to clarify - this is not a LVDT, it is a differential eddy-current sensor designed to measure the gap between the bottom of the sensor and a conducting plate.