PVF2膜传感器在模型桩动测系统中的应用

建立了一套高精度的模型桩动测系统，首次采用新型聚偏二氟乙烯（PVF2）薄膜压电式传感器及光栅位移传感器分别测试桩端力和位移。该系统可以同时获得模型桩在轴向冲击力作用下，桩端力和位移、桩顶力和加速度4组信号。经验证，由PVF2膜传感器获得的值与计算值吻合较好。该系统对应用应力波理论进行模型桩多参数试验研究及桩端阻力测试是适宜的。

Application of PVF2 Film Sensor on Dynamic Measurement System of a Model Pile

In this paper, a highly accurate system for dynamic measurement of model pile was installed. A new type of force transducer-piezoelectric polyvinylidence fluoride (PVF 2) film and a grating displacement sensor were used to measure the force and displacement at the pile toe respectively for the first time. The system can be used to synchronously measure 4 signals, i.e., the force and displacement at the pile toe as well as the force and acceleration at the head of pile when the pile is subjected to an axial impact load. It is verified that the signals from the transducers is well coincident with the calculated solutions. The system would be an ideal one to study multi_parameter dynamic measurement of model pile by stress wave theory and the resistance model of the pile toe.