PMT在测量超高速碰撞闪光趋势中的应用

为了研究超高速碰撞闪光强度和趋势,设计了超高速碰撞闪光光电倍增管测量系统. 该测量系统由4通道组成,由光纤探头采集的不同波长的闪光信号经光纤输入光电倍增管,将光信号转换为电信号并放大后输入示波器. 通过不同碰撞条件下的二级轻气炮加载实验测出给定位置、方位角和不同碰撞条件下的碰撞闪光趋势,根据测量系统的标定计算出碰撞闪光强度. 实验结果表明,碰撞闪光的特点比较明显,强度峰值信号首先出现,其后伴随持续的黑体辐射衰减.

Application of Photoelectric Magnification Tubes(PMT) in Light Flash Trend Measurements During Hypervelocity Impact

To investigate the light flash intensity and trend generated by hypervelocity impact,an experimental system for impact flash photoelectric magnification tuber (PMT) measurement has been designed.The measurement system is composed of four channels,in which fibre-optics probe collects the flash signals of different wavelengths and feeds it to PMT.The flash signals are transformed to electric signals and amplified by PMT,and then fed to the oscilloscope.The flash for given positions and azimuth angles at different impact conditions are obtained by two-stage light gas gun loading experiments.Impact flash intensity in turn is obtained by calculation according to measurement system calibration.Experiments illustrated that the characteristics of impact flash were obvious,an intensity peak appeared firstly followed by a long-lasting blackbody decay.