A concept of divergence angle of light beams(DALB)is proposed to analyze the depth of field(DOF)of a 3D light-field display system.The mathematical model between DOF and DALB is established,and the conclusion that DOF...A concept of divergence angle of light beams(DALB)is proposed to analyze the depth of field(DOF)of a 3D light-field display system.The mathematical model between DOF and DALB is established,and the conclusion that DOF and DALB are inversely proportional is drawn.To reduce DALB and generate clear depth perception,a triple composite aspheric lens structure with a viewing angle of 100°is designed and experimentally demonstrated.The DALB-constrained 3D light-field display system significantly improves the clarity of 3D images and also performs well in imaging at a 3D scene with a DOF over 30 cm.展开更多
为消除场致发射电推力器(Field emission electric propulsion,FEEP)羽流发散角度过大给推进器寿命和可靠性带来的不利影响,研究了聚焦电极阵列空间位置对羽流聚焦效果的影响,并通过正交试验法给出了最优电极分布。通过数值仿真对FEEP...为消除场致发射电推力器(Field emission electric propulsion,FEEP)羽流发散角度过大给推进器寿命和可靠性带来的不利影响,研究了聚焦电极阵列空间位置对羽流聚焦效果的影响,并通过正交试验法给出了最优电极分布。通过数值仿真对FEEP的离子运动过程建模,采用正交试验方法电极阵列进行研究,关注其在不同空间位置下的聚焦效果,得到了离子出射半角分布和推力大小。结果表明,聚焦极的位置决定了羽流的聚焦效果,其次是提取极和加速极;聚焦极径向距离发射极1600μm,且提取极径向和轴向坐标为(800μm,500μm)时能得到最优的聚焦效果。本文验证了正交试验方法在聚焦电极阵列设计上的可行性,同时还为聚焦电极阵列设计提供了有效的分析方法和设计策略。展开更多
基金supported by the National Key Research and Development Program of China(No.2021YFB3600504)the National Natural Science Foundation of China(Nos.62175015 and 62075016)。
文摘A concept of divergence angle of light beams(DALB)is proposed to analyze the depth of field(DOF)of a 3D light-field display system.The mathematical model between DOF and DALB is established,and the conclusion that DOF and DALB are inversely proportional is drawn.To reduce DALB and generate clear depth perception,a triple composite aspheric lens structure with a viewing angle of 100°is designed and experimentally demonstrated.The DALB-constrained 3D light-field display system significantly improves the clarity of 3D images and also performs well in imaging at a 3D scene with a DOF over 30 cm.
文摘为消除场致发射电推力器(Field emission electric propulsion,FEEP)羽流发散角度过大给推进器寿命和可靠性带来的不利影响,研究了聚焦电极阵列空间位置对羽流聚焦效果的影响,并通过正交试验法给出了最优电极分布。通过数值仿真对FEEP的离子运动过程建模,采用正交试验方法电极阵列进行研究,关注其在不同空间位置下的聚焦效果,得到了离子出射半角分布和推力大小。结果表明,聚焦极的位置决定了羽流的聚焦效果,其次是提取极和加速极;聚焦极径向距离发射极1600μm,且提取极径向和轴向坐标为(800μm,500μm)时能得到最优的聚焦效果。本文验证了正交试验方法在聚焦电极阵列设计上的可行性,同时还为聚焦电极阵列设计提供了有效的分析方法和设计策略。
