An Improvement on Resistance Measuring Technique of Insulant under Shock Compression

An improvement technique, in comparison with that of the Mitchell, et al, on measuring the resistance of insulant under shock compression is proposed in this paper. The main point of the improvement is adding a circuit branch with an etalon resistance connected in series in it, for monitoring the shock-wave arrival time entering the sample, in the measuring electrical circuit. Advantages of the improvement are: (1) it is in favor of enhancing the sample resistance signal magnitude, or extending the upper measurable emits of the sample resistance; (2) the etalon resistance could be used to check the measured value of the sample resistance; and (3) the shock velocities in the sample were obtained simultaneously. A measurement of Teflon specimen is given as an example. A brief discussion of the characteristics of the improvement is given.