A Smart Displacement Measuring Technique Using Linear Variable Displacement Transducer

This paper aims to design of a smart displacement measuring technique using Linear Variable Differential Transformer (LVDT). The objectives of this work are to (i) extend the linearity range of LVDT, (ii) eliminate the dependence of physical parameters of LVDT, (iii) eliminate the affect of input frequency and (iv) eliminate the effect of working temperature on the output of LVDT. The output of LVDT is differential ac voltages in secondary coils. It is converted to dc voltage by using a suitable data conversion circuit. An ANN block is added in cascade to data conversion unit. This arrangement helps to extend linearity range of the overall system and makes it independent of physical parameters of LVDT, input frequency and working temperature. Since the proposed smart displacement measuring technique produces output independent of physical parameters of LVDT, input frequency and working temperature, thus the present work avoids the requirement of repeated calibration every time the LVDT, input frequency or working temperature is varying.