Fiber Bragg Grating Sensing Multiplexing System Based on Interferometric Demodulation Technique
Controlled by an optical switch, liber Bragg grating sensing system based on spatial division multiplexing was achieved when a broad-band source illumines FBG sensor array. With an isosceles triangle cantilever beam to realize linear tuning of Bragg wavelength of fiber grating without chirping by adjusting the deflection of the free end, the system employs an unbalanced Mach-Zehnder interferometer to translate the FBG wavelength signal related the strain into phase signal. The strain can be recovered by measuring the phase change of the signal with signal processing circuit. With the characteristic of high resolution and wide measurement range, this sensing system has the capability of measuring static strain as well as dynamic strain. Experiment demonstrated that the sensing sensitivity was 0.82°°/με.
fiber bragg grating(FBG) interferometric demodulation spatial division multiplexing phase measurement
Li Li Yuchi Lin
Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University o State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Nankai Dis
国际会议
太原
英文
699-701
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）