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倾斜光纤光栅的透射谱中有纤芯模和大量的包层模,它们具有与布拉格光栅相同的温度特性。利用HF酸腐蚀的方法得到具有不同包层直径的倾斜光纤光栅,研究了其对外界折射率的传感特性。结果表明,外界环境折射率在1.333～1.4532之间变化时,同一直径倾斜光纤光栅的高阶包层模的敏感性要比低阶包层模强;随着包层直径的减小,包层模的敏感性增强,且在折射率比较高的环境中有更高的敏感性。因此,利用倾斜光纤光栅的温度特性不仅可以解决温度交叉敏感问题,而且通过不同的腐蚀程度能定制所需要的灵敏度,以实现对环境折射率的高灵敏度测量。该方法可应用于对生物和化学等高灵敏度传感领域的各种溶液进行实时监控。
Inclinometer fiber grating transmission spectrum has a core mode and a large number of cladding mode, they have the same Bragg grating temperature characteristics. The tilted fiber gratings with different cladding diameters were obtained by the HF acid etching method, and their sensing characteristics on the refractive index of the outside were studied. The results show that the sensitivity of the higher-order cladding modes of the same diameter tilted fiber gratings is higher than that of the lower-order cladding modes when the refractive index of the external environment varies from 1.333 to 1.4532. With the decrease of the cladding diameter, the cladding The sensitivity of the mold is enhanced and it is more sensitive in environments with higher refractive index. Therefore, using the temperature characteristics of tilted fiber gratings can not only solve the problem of temperature cross-sensitivity, but also can be customized by the different degree of corrosion required sensitivity to achieve high sensitivity to environmental refractive index measurement. The method can be applied to real-time monitoring of various solutions in the fields of biological and chemical high-sensitivity sensing.