Study On The Design And Experiment Of PVDF Pressure Sensor For Explosive Charge

In a certain extent, the launching safety of explosive charge restricts the reasonable application of explosive. A large number of experiment home and abroad verify that the initiation of explosion depends not only on the loading stress a, but also on loading time t and stress rate σ. And the theoretical calculation and experiment demonstrate that the stress at the bottom of explosive is the maximum stress. So it is very significance to measure the stress at the bottom of explosive under the real condition. In this thesis, PVDF pressure sensor is designed and manufactured to conduct the following research:(1)Analyzing the piezoelectric characteristic and the signal amplifying circuit of PVDF film, designing and manufacturing the PVDF pressure sensor.(2)Testing for quasi-statics response of the PVDF sensors under different temperature by electronic universal testing machine equipped with high and low temperature control box, researching on sensitivity changing of PVDF sensors under the combination of force and temperature(3)Measuring sensitivity coefficients of PVDF stress sensors under different strain rates by drop hammer test device and Kistler force sensor, providing the standard uncertainty value of sensitivity, researching on the frequency response characteristic of PVDF stress sensors on the drop hammer test machine(4)Calibrating PVDF stress sensors by simulation test device of explosive loading conditions containing vertical overload and high-speed revolution,then installing the sensors on simulation test device,measuring the stress at the bottom of explosive under the real condition.