针对裸光纤布拉格光栅应变监测量程或精度有限的问题，提出了一种灵敏度系数可调光纤布拉格光栅应变传感器的设计方法。理论和实验研究了该方法在增大光纤布拉格光栅应变监测量程或提高精度方面的性能，并以此研制了基片表面粘贴式和FRP封装式两种封装结构的灵敏度系数可调应变传感器。理论分析并实验标定了传感器的灵敏度系数。最后，对传感器理论和实验灵敏度系数误差进行了分析，指出了改进的方向。实验结果表明：两种封装结构的大量程传感器的量程分别增加了243%和126%，高精度传感器的精度提高至0.51 με和0.52 με。传感器标定实验表明，两种封装结构的传感器都有很好的线性度和重复性，相关系数达到0.999以上。

A design method for coefficient-adjustable FBG strain sensors was given out to deal with the problem of the limited scale or precision for a Fiber Bragg Grating(FBG) strain monitor. Theoretical and experimental researches were performed to test the characters of the sensors on long-gauge or high precision,then two kinds of high qualified FBG strain sensors(slice mode and FRG packaging mode) were developed and fabricated to validate the design. The sensitivity coefficient of each sensor was analyzed,and it was also calibrated by experiments. Finally, the errors between theoretical and experimental sensitivity coefficients were analyzed. Experimental results indicate that the ranges of the long-gauge sensors have increased by 243% and 126%, and the accuracies of the high-precision sensors have reached 0.51 με and 0.52 με,respectively. In the experiments of calibrations,both kinds of sensors show good linearity and repeatability,and the correlation coefficient is up to 0.999.