Abstract: The wavelength demodulation with fiber Bragg grating bases the property that the average refractive index and grid period of fiber grating are sensitive to the environment variation, and the drift of Bragg wavelength depends on the environment parameter change, thus the environment parameter may be demodulated from the drift of Bragg wavelength. The multiplying technology has been used to construct the fiber grating sensing network. With the network, a light source and Bragg wavelength detecting circuit, hardware has been developed. Using LabVIEW, the corresponding software has been designed. Both the hardware and software have been tested in the lab. The experimental results indicate that under the same test conditions the variation of FBG wavelength is stable, the processing data is repetitive, and the system is reliable.

Key words: fiber Bragg grating(FBG), fiber grating sensing network, wavelength demodulation, LabVIEW