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建立了一种基于闪耀光纤光栅(BFBG)透射特性的分布式光纤布拉格光栅(FBG)传感器的解调系统。由两个中心波长相近、光栅长度不同的FBG并联组成一个传感探头(FBG1用于参考,FBG2用于传感),以消除温度对应变测量的影响。将BFBG两端与加有10 Hz锯齿扫描电压的压电陶瓷(PZT)相固定,使BFBG的主模和边模发生周期性的同向偏移,对传感探头的光谱信号进行解调。从BFBG出来的透射光经光电管将光强变化转化为电信号,用计算机对待测应变量进行实时分析显示。实验表明,用BFBG进行光谱解调是可行的(微应变测量的分辨率为5με),并且成功地解决了温度和应变交叉敏感的问题,所建立的实验系统稳定可靠,成本低。
A distributed FBG sensor demodulation system based on the transmission characteristics of blazed fiber grating (BFBG) was established. Two FBGs with similar center wavelength and different grating lengths form a sensing probe (FBG1 for reference and FBG2 for sensing), so as to eliminate the effect of temperature on strain measurement. The two ends of BFBG are fixed with piezoelectric ceramic (PZT) with a scanning voltage of 10 Hz, so that the main mode and side mode of BFBG are cyclically shifted in the same direction and the spectral signal of the sensing probe is demodulated. Transmitted light from the BFBG through the photoelectric tube will be light intensity changes into electrical signals, with the computer to be measured variables to be analyzed in real time. Experiments show that spectral demodulation with BFBG is feasible (the resolution of micro-strain measurement is 5με), and the cross-sensitivity of temperature and strain is successfully solved. The experimental system is stable and reliable with low cost.