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提出一种先进的基于偏振光干涉的光纤光栅解调实现方法 ,偏振光干涉仪也是一种能将布拉格波长移动转化为干涉相位变化的非平衡干涉仪。与传统的非平衡干涉仪不同 ,偏振光干涉仪是利用折射率ne 和no 的差而不是利用光路长短的差来实现非平衡干涉的。另外 ,由于偏振光干涉是发生在有着优良双折射特性的钒酸钇(YVO4)晶体中而不是在石英光纤中 ,这样就可避免石英光纤引入的干涉噪声。通过分析钒酸钇晶体的性质指出 ,利用这种方法来实现光纤光栅温度检测 ,其最小温度测量精度可达± 0 4℃。
An advanced method for demodulation of FBG based on polarization interference is proposed. Polarization interferometer is also a non-equilibrium interferometer that can transform the wavelength of Bragg wavelength into the phase change of interference. Unlike conventional unbalanced interferometers, the polarization interferometer utilizes the difference between the refractive indices ne and no instead of using the difference in the length of the optical path to achieve unbalanced interference. In addition, since the interference of polarized light takes place in yttrium vanadate (YVO4) crystals having excellent birefringence properties rather than in silica optical fibers, interference noise introduced by the silica optical fiber can be avoided. By analyzing the properties of yttrium vanadate crystals, it is pointed out that using this method to achieve the temperature detection of fiber grating, the minimum temperature measurement accuracy of ± 0 4 ℃.