A novel signal demodulation technique for chirped Bragg grating strain sensors

While Bragg grating strain sensors have been used in many applications, the need to monitor the variation in the grating's peak wavelength as well as the bandwidth has frequently required the use of expensive and bulky spectral decomposition systems. The increased use of chirped Bragg grating sensors, where the bandwidth varies as the grating is subjected to external perturbations, also requires the use of these wavelength demodulation systems for proper use in many applications. In this paper we report the development and demonstration of a novel demodulation technique which may be readily used for chirped Bragg grating strain sensors.