Incorporation of sensors into structures and machines provide valuable information about their performance and reliability in real time. Fiber Optic Polarimetric Sensor (FOPS) for the smart structure applications is designed, developed and applied to different applications. The sensor monitors the change in the state of polarization of the light beam traversing through the fiber under various loading conditions. This paper describes the characterization, optimization and evaluation of the performance the fiber sensor. It also discusses the different applications of a prototype FOPS system that was developed.