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对A.C.Mitchell等的测量冲击压缩下绝缘材料电阻率的技术做了改进,其主要之点是,在测量电路中增加了一个记录冲击波进入试件的电支路,并在新支路中串接一个基准电阻。这样做的好处是:(1)便于提高试件电阻信号的电平,或提高试件电阻的可测上限范围;(2)可以用基准电阻的实测值对试件的实测电阻值进行校核;(3)可以同时测得试件中的冲击波速度值。文中还以聚四氟乙烯材料的实测结果为例,对本方法的特点做了初步讨论。
The improvement of ACMitchell’s technique for measuring the resistivity of an insulating material under impact compression is based on the addition of an electrical branch in the measuring circuit that records the shock wave entering the test piece and is connected in series in a new branch A reference resistor. The benefits of doing so are: (1) it is easy to increase the level of the resistance signal of the test piece or to increase the upper limit of the test piece’s resistance; (2) the actually measured resistance of the test piece can be checked with the actual value of the reference resistance ; (3) The shock wave velocity value in the specimen can be measured at the same time. The paper also measured the results of PTFE material, for example, the characteristics of the method made a preliminary discussion.