CAJ | 학술논문

光纤布拉格光栅已经成为非常有前景的温度、应力及其它参数测量的传感元件，但其存在温度和应力的交叉敏感问题。提出了一种双包层半径光纤布拉格光栅传感器，将一个布拉格光纤光栅分成两半，各自具有不同的包层半径，其中一半保持不变，另一半包层半径从62.5μm减小到40μm。实验结果表明，两半光纤布拉格光栅的温度灵敏度均为10.4 pm/°C，而应力灵敏度分别为1.12 pm/ue和3.89 pm/ue。初始的单个布拉格反射峰分裂成两个，分别对温度和应力敏感，而两个反射峰之间的波长差只受应力的影响，随着应力的增加其波长差逐渐增加。因此，通过这一个光纤布拉格光栅即可分辨出温度和应力所引起的布拉格波长漂移。该光纤光栅传感器结构简单、体积小巧、成本低廉、制作方便，可以广泛应用在各个领域实现温度和应力的同时测量。
광섬포랍격광책이경성위비상유전경적온도、응력급기타삼수측량적전감원건，단기존재온도화응력적교차민감문제。제출료일충쌍포층반경광섬포랍격광책전감기，장일개포랍격광섬광책분성량반，각자구유불동적포층반경，기중일반보지불변，령일반포층반경종62.5μm감소도40μm。실험결과표명，량반광섬포랍격광책적온도령민도균위10.4 pm/°C，이응력령민도분별위1.12 pm/ue화3.89 pm/ue。초시적단개포랍격반사봉분렬성량개，분별대온도화응력민감，이량개반사봉지간적파장차지수응력적영향，수착응력적증가기파장차축점증가。인차，통과저일개광섬포랍격광책즉가분변출온도화응력소인기적포랍격파장표이。해광섬광책전감기결구간단、체적소교、성본저렴、제작방편，가이엄범응용재각개영역실현온도화응력적동시측량。
Fiber Bragg grating (FBG) has been widely used in many fields for temperature, stress and other parameters measurement, but it has cross-sensitivity problem with temperature and stress. A dual cladding radius fiber Bragg grating sensor was presented, the FBG was divided into two halves which have different cladding radiuses, the cladding radius of one half (FBG1) was unchanged, and the cladding radius of the other half (FBG2) was decreased from 62.5μm to 40μm. Experimental results show that, FBG2 and FBG1 have same temperature sensitivities which are 10.4 pm/° C, but FBG2 and FBG1 have different stress sensitivities which are 1.12 pm/ue and 3.89 pm/ue respectively, the stress sensitivity of FBG2 is higher than FBG1 nearly 3.24 times. The initial single Bragg reflection peak split into two reflection peaks which respectively sensitive to temperature and stress, the wavelength difference between these two peaks only impact on stress. Through this sensor, it can distinguish center reflection wavelength shift caused by temperature and stress. The sensor has simple structure, small size, low-cost, and simple fabrication,and it be can widely used in various fields to achieve simultaneous measurement of temperature and stress.