Distributed biber bragg grating sensor system based on TDM

In order to effectively improve the capacity of grating multiplexing, a scheme of distributed fiber bragg grating sensor network based on time division multiplexing(TDM) demodulation mode was proposed and demonstrated.The wavelength demodulation module connected one of the sensor channels in the TDM mode,realized the sensing demodulation end using the sensing port select light link by the multiplying way to many sensing channels′ stop-go control,and demodulated the wavelengths of the FBG sensors.In the experimental verification system,and based on the match fiber grating demodulation plan, the identical FBG cycle was measured many times with the 2.5 Hz rotational test frequency.The system demodulation precision was ±0.06 nm.The results show that the scheme is feasible and prominent in extensible characteristic with good repeated measurement stability,which is helpful for designing high performance FBG sensor network.