FBG传感器是一种极具发展潜力和应用价值的新型传感器,文中简要介绍了FBG应变传感器的传感原理和应变传递规律,并将FBG传感器在机械静态连接状态检测研究中得以实际应用。通过测量机械部件的应变值确定其不同的连接状态,通过分析机械连接系统在不同连接状态下特征频率的变化趋势,验证了机械连接系统特征频率与连接状态之间的关联性。 FBG sensor is a new type of sensor with great development potential and application value. In this paper, the sensing principle and strain transfer law of FBG strain sensor are briefly introduced. The FBG sensor is applied in the research of mechanical static connection state detection. By measuring the strain values ​​of mechanical components to determine the different connection states, the relationship between the characteristic frequency and the connection state of the mechanical connection system was verified by analyzing the trend of the characteristic frequency of the mechanical connection system under different connection states.