Dual parameter measurement system for temperature and stress based on Sagnac interferomter.

The article focuses on Optical fiber sensor based on Sagnac interferomter. Topics include that the sensor is designed by combination of photonic crystal fiber (PCF) and fiber Bragg grating (FBG) and the device is used for measuring various physical parameters including temperature and stress by the changes of physical characteristics such as interference, diffraction, and polarization caused by light propagation in the optical fiber.