High-sensitivity and real-time displacement sensor based on polarization properties in fiber

A novel displacement sensor based on polarization properties in fiber is demonstrated in this paper. The cantilever beam is used as a transducer to convert the displacement into a transverse force onto the fiber which results in the fiber birefringence and hence the amplitude of the Stokes parameters in fiber. The sensitivity and linear range of the sensor depends on incident state of polarization (SOP) and the mechanical and geometric parameters of the cantilever beam. The highest sensitivity of 4.0045/mm has been achieved in the experiments.