采用了一种基于等强度悬臂梁的双光纤栅组合法,实现温度与应力的同时测量.选用同一批次生产的参数一致的两根光纤Bragg光栅,将其分别粘贴在等强度梁的上下表面,通过梁上下光栅所受的应力大小相等而方向相反,产生两个反射峰来实现温度与应力的同时测量.通过实验测得光栅温度灵敏度系数为0.1346 nm/℃,梁上下光栅误差仅为0.0001 nm/℃;应力灵敏度系数分别为0.4085 nm/N,-0.4089 nm/N,误差也仅为0.0004 nm/N.实验结果表明该方法切实可行,制作工艺简单,克服了传统双光栅组合法难以保证测量位置准确性的缺点.
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