结合线性啁啾光纤布拉格光栅(CFBG),设计了一种基于激光拍频实现应力测量的传感装置。系统采用CFBG的时延改变谐振腔的腔长的方法,把波长变化转化为腔长变化,不同于以往改变腔长的方法,达到波长解调实现传感测量的目的。对线性CFBG的时延谱进行了测量,并对系统结构和测量原理进行了详细的阐述,对测量结果和精确度也进行了分析与计算。谐振腔长变化可达到6.2cm,腔长变化值与腔长比达到2.55%,使应力测量精度可以提高到10~(-7)N。 Combined with linear chirped fiber Bragg grating (CFBG), a sensing device based on laser beat frequency measurement is designed. The system uses the time delay of CFBG to change the cavity length of the cavity. The method converts the wavelength variation into the variation of the cavity length, which is different from the method of changing the cavity length in the past, and achieves the wavelength demodulation to realize the sensing measurement. The time delay spectrum of linear CFBG is measured, and the system structure and measurement principle are described in detail. The measurement results and the precision are also analyzed and calculated. Resonant cavity length change can reach 6.2cm, cavity length change and cavity length ratio of 2.55%, the stress measurement accuracy can be increased to 10 ~ (-7) N.