Aiming at mismatching problem of central wavelength caused by fabrication technology and prestress in distributed grating sensor networks

a temperature control system based on thermoelectric cooler（ TEC） is designed

which improves demodulation range and precision of the demodulation system. Architecture of the system based on ARM + LTC1923 + high precision DA realizes precise temperature control of multiple TECs at the same time

which achieves to modulate the central wavelength of each path of the reference fiber Bragg grating（ FBG）in distributed FBG sensor networks

which makes the referrence FBG’s central wavelength match well with its sense FBG. Experimental results show that this system has good repeatability

and the control precision is high in specific temperature range.