Efficient measurement of temperature, humidity and strain variation by modeling reflection Bragg grating spectrum in WSN

Measurement and monitoring of temperature, humidity and strain variation are very requested in great fields and area such as structural health monitoring (SHM) systems. Currently, the use of fiber Bragg grating sensors (FBGS) based on wireless sensor network (WSN) has been recommended in SHM due to the specifications of these sensors. In this paper, we proposed an architecture of wireless SHM system based on FBGS and wireless sensor network, therefore we try to measure the efficient variation of strain, temperature and humidity (SV, ST, SH) by modeling the spectrum of FBGS. Thus, we deduce the fundamental relation between these parameters and the wavelength of Bragg grating.