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针对桥梁动挠度信号的特点及其对测试传感器频率特性的要求，分析动挠度的几种测试方法，从而提出采用地震式低频振动传感器测量桥梁动挠度。利用信号恢复技术，对地震式低频振动传感器国频率特性而畸变的输出作补偿处理，并讨论系统存在零点时的恢复技术，及噪声下恢复处理的不适定性。采用约束最小平方卷积反演技术获得在最小平方误差意义下对输入的最优估计，为动挠度信号的拾取提供了十分便捷有效的测试手段。
According to the characteristics of dynamic deflection signal of bridge and its requirements on the frequency characteristics of the test sensor, several test methods of dynamic deflection are analyzed, and the dynamic deflection of the bridge is proposed by seismic low frequency vibration sensor. The signal recovery technique was used to compensate for the distortion of the frequency characteristics of the seismic sensor. The recovery technique when the system had zero and the ill-posedness of the recovery process under noise were discussed. The constrained least-squares convolution inversion technique is used to obtain the optimal estimate of the input in the sense of least square error, which provides a very convenient and effective test method for pick-up of dynamic deflection signals.