square wave input to lvdt and what are the demodulation
techniques for square wave?  If it is an + square wave just add
a diode and a cap. If it is an AC square wave add a bridge
rectifier and a smaller cap. LVDTs NEED sinewave excitation if
you want a chance of linear outputs.  The standard methods
usually use a phase-sensitive detector, but Analog Devices do
the AD598, which does the excitation and demodulation for you.
iceng2 years ago The linear variable differential transformer
generates a voltage proportional to displacement of an iron rod
this makes the device a great electronic measuring stick for
motion like a water tank or a plant growth or a sub conscious
smile.