作者:张俊喜，王致远，粱泰铭，李欣
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Authors:ZHANG Jun-xi, WANG Zhi-yuan, LIANG Tai-ming, LI Xin摘要:摘要:光纤光栅是一种在对光纤纤芯进行折射率调制而具有周期性折射率分布的特殊光纤。光栅的角度和周期都会影响光纤光栅的传感性能。为了探讨不同光纤光栅的传感器性能及其不同的传感应用领域，采用透射谱测量的方法，分析了小角度倾斜光纤光栅、长周期光纤光栅和大角度倾斜光纤光栅的传感性能，研究了不同类型光纤光栅的模式特征及其传感原理。测量结果显示三种光纤光栅的折射率传感灵敏度分别为18.852 nm/RIU、1.67 nm/RIU和198.67 nm/RIU，表明通常情况下大角度倾斜光纤光栅的传感灵敏度比其它光纤光栅的灵敏度高。
Abstract:Abstract:Fiber gratings are special optical fibers with a periodic refractive index distribution when the refractive index of the fiber core is modulated. Both the angle and period of the gratings have an influence on the sensing properties of the fiber gratings. To explore the sensor properties of different fiber gratings and their different application fields, in this paper， based on measurements of the transmission spectra， the refractive index sensing properties of the small-angle tilted fiber Bragg grating， long-period fiber grating， and large-angle tilted fiber grating have been analyzed， and the characteristics of modes and principle of sensing of the different types of fiber gratings have been analyzed. Moreover， the measurement results show that the sensitivities of the refractive index sensing of the three types of fiber gratings are 18.8 nm/RIU， 1.67 nm/RIU， and 198.67 nm/RIU， respectively， indicating that the sensing sensitivity of the large-angle fiber grating is generally higher than those of other fiber gratings.


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