From the point of view of industrial application, fiber optic sensors possess the virtues of excellent sensitivity, dynamic range, low cost, high reliability, immunity to electromagnetic interference, electromagnetic pulses, and radio frequency interference, small size, and low weight. Almost all the parameters needed for industrial process control e.g. temperature, pressure, strain, fluid level, flow rate, displacement/position, vibration, pH, electric and magnetic field, voltage and current etc can be measured or monitored by fiber optic sensors.This book deals with Modelling,Simulation and Experimental study of Fiber Optic Displacement Sensors and its Different Applications.