Birefringent Stress Location Sensor

Abstract

A new type of stress location sensor is discussed in which the FMÇW technique is used to detect the difference in propagation time between two optical paths in an optical fiber due to stress induced modal coupling.Two versions of the system are included, and experimental results are presented for each system.

Distributed and Multiplexed Fiber Optic Sensors

“…The basic principle of operation for the case involving the use of orthogonal polarization modes is shown in Fig. 11.7 [21,22]. Here, polarized light from a laser is launched into one polarization mode of the fiber of length L and the output light received is analyzed using a polarizer set at 45 to the fiber eigenmodes.…”