Measurement of dynamic characteristics of metal sheet under laser shock

A new approach is developed to measure the dynamic characteristics of metal sheet under laser shock,including deformation velocity,strain,and strain rate.The detecting laser beam is partially shaded by the target deformation induced by the laser action.A photodiode transforms the received beam intensity real time into an electrical signal which could record the process of the target deformation.The functional relation between the electrical signal and the deformation of the metal sheet is derived.The deformation curve of a thin aluminum and the velocity curve of its deformation are also obtained during the exper-iment.The results indicate that the average velocity of the elastic deformation of the target can reach 2.999×10 3 m/s in the central area.This new method provides an approach in the study of the effect of strain rate on deformation.     

脂二胺在颜料分散体中光化学反应活泼自由基的ESR研究

用自旋捕捉技术与ESR相结合的方法研究了脂二胺在ZnO、TiO₂的庚烷或苯的分散体系中光诱导的电子转移过程。观察到DMPO与氮中心自由基加合物的ESR信号,表明捕捉到的自由基是脂二胺与光生空穴作用而产生的胺的阳离子自由基。