Simultaneous measurement of temperature and strain based on fiber loop mirror combined with fiber Bragg grating

Simultaneous measurement of temperature and strain without cross-sensitivity using a polarization maintaining fiber (PMF) in a fiber loop mirror (FLM) and a fiber Bragg grating (FBG) is presented. The sensing head is formed by inserting a FBG to the PMF-FLM. This sensor can not only be multi-parameter identification simultaneously, but also eliminate cross-sensitivity. Experimental results show that the proposed sensor has the temperature sensitivity of-1.5096 nm/degrees C and strain sensitivity of 0.01042 nm/mu epsilon, respectively