50%爆炸的隔板厚变是表示炸药冲击波感度的一种简单比较方法。本文提出一个简便的测量装置，能准确地测量冲击波在不同材料隔板中的行进距离随时闽的变化关系，从而计算隔板中不同厚度处的冲击波速度每冲击波压力。实验研究给出了Ly-12铝、45号钢和有机玻璃隔板的结果，以及它们之间的相互比较。

Barrier length (or gap thickness) has been used to represent the comparative sequence of shock sensitivity of different explosives. In this work，in order to calculate the shock pressure at the end of a barrier whose thickness represents the sensitivity of a charge， a simple but effective experimental set-up is presented for the measurement of the shock velocity in the barrier. With this measuring s],stem can be obtained fair display of the transmitting wave，with a high responce rate and a large amount of available data points of instantaneous value. In the present method, trails of propagation of shock waves in different barriers are first measured with precision, and the shock velocities are derived from the differentials of the trails. The shock pressure under any specific condition is calculated from the shock velocity with the Hugoniot equation of the material. Shock velocity and pressure attenuation versus distance in some barrier materials such as Ly-12A1,plain carbon steel#45，and plexiglass were obtained and compared with each other.