Abstract
According to the requirement of large complex structure monitoring, the principle of wavelength demodulation of fiber Bragg grating (FBG) has been researched. A system model has been designed based on virtual instrument technique. The technology schemes are proposed in main aspect, such as signal processing, network communication, data storage and so on. By experimentation, the FBG Sensing Net Analyzer can measure exceed 1000 points and gives a wavelength accuracy of about ±10 pm. The strain range is ±800×10-6 and the temperature range is ±100°C, that can meet the stringent requirements of engineering practice of large complex structure.
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