背景光辐照下SrAl_2O_4:(Eu^(2+),Dy^(3+))的力致发光性能的实验研究

SrAl_2O_4:(Eu^(2+),Dy^(3+))作为一种力致发光材料,因其力致发光强度高而受到广泛的关注。但SrAl_2O_4:(Eu^(2+),Dy^(3+))力致发光强度随余辉衰减时间延长而减弱,这一特性阻碍了它在应力传感器中的实际应用。针对这一问题,本文采用小球下落冲击法,研究了背景光照射下SrAl_2O_4:(Eu^(2+),Dy^(3+))长余辉发光材料的力致发光特性。相比无背景光条件下的力致发光,采用的365 nm背景光持续辐照SrAl_2O_4:(Eu^(2+),Dy^(3+)),可以使其力致发光强度不受余辉衰减时间影响,并能够提高力致发光强度及灵敏度。这一结果有助于推动SrAl_2O_4:(Eu^(2+),Dy^(3+))在冲击力传感领域的应用。

Flexible cone impact dynamics based on space probe-cone docking mechanism

The theoretical model of docking impact dynamics based on flexible cone is presented according to Foppl-von Karman＇s non-linear differential equations and Hertz contact theory. Finite diflerence technique is used to solve this theoretical model. Results of the theoretical model show good agreement with the experimental and ANSYS/LS-DYNA simulation results. In ad- dition, the influence of flexible cone parameters on impact process is discussed based on theoretical model systemically.