Optical fiber sensing system for temperature and strain simultaneously measurement based on low coherence interferometers

A system based on the Mach-Zehnder low-coherence interferometer for simultaneously measurement in the field of temperature and strain is presented. This system utilizes the principle of the optical path difference modulation and the coherence length modulation in the low coherence interferometer. After frequently testing the interference signal influenced by the temperature and the strain, the sensitivity of the system is obtained. The stability and the multiplexed capability of the system are also investigated.