考虑在实际应变测量中传感器封装形式会影响光纤Bragg光栅测得的应变响应，本文研究了测量应变与实际应变之间的关系。针对埋入式光纤Bragg光栅传感器，建立了应变传递函数，并对传递函数的正确性和各个参数对测量应变的影响进行了研究。首先，根据埋入式光纤Bragg光栅传感器的受力特点，提出了多项式形式的剪应力分布，进一步建立了应变传递函数。然后，利用数值方法和实验对该应变传递函数进行验证。最后，分析了传感器长度、胶结层弹性模量、胶结层厚度对测量应变的影响。计算结果表明: 该应变传递函数正确; 胶结层厚度越薄，弹性模量越大，越有利于应变传递。该应变传递函数计算误差控制在5%以内，完全满足埋入式光纤Bragg光栅测量精度要求，对其实际应用具有指导意义。

As the package structures of a sensor seriously interfere the strain responses measured by a Fiber-optic Bragg Grating(FBG), this paper focuses on the relationship of measured strain and true strain in the actual measurement. It establishes a strain transfer function for embedded FBG sensors and verifies the validity of the transfer function and the influence of different parameters on the measured strain. Firstly, based on mechanical characteristics of embedded FBG sensors, the shear stress distribution with a form of polynomial is presented, then the strain transfer function is established and verified by taking a numerical method and an experiment. Finally the influence of sensor length, cementation layer modulus and cementation layer thickness on the measured strain is analyzed. Experimental results indicate that the strain transfer function is valid. Moreover, the thinner the cementation thickness and the higner the cementation modulus are, the more convenient the strain transfer is. The strain transfer function satisfies the accuracy requirement of embedded FBG sensors because the calculation error is controlled within 5%, which is considered as a guidance for its practical application.