为制作生物医学用小型化、紧凑型ns脉冲发生器,结合非平衡Blumlein型多层微带传输线和固态开关技术,研制了一台基于非平衡Blumlein型传输线的全固态高压纳秒脉冲发生器。通过波传播过程分析非平衡Blumlein型多层微带传输线方波形成原理...为制作生物医学用小型化、紧凑型ns脉冲发生器,结合非平衡Blumlein型多层微带传输线和固态开关技术,研制了一台基于非平衡Blumlein型传输线的全固态高压纳秒脉冲发生器。通过波传播过程分析非平衡Blumlein型多层微带传输线方波形成原理;介绍了相关固态开关的控制时序及其'截波'策略,以此实现50~100 ns的方波脉冲脉宽可调;阐释了非平衡Blumlein型多层微带传输线系统的负载阻抗可变的相关原理;并研制了一台小型纳秒脉冲发生器以进行相关性能测试。最终,在50Ω负载下的纳秒脉冲电压参数:幅值0~2 k V可调、脉宽50~100 ns可调、重复频率0~1 k Hz可调,上升时间约20 ns;此外,测试了500Ω负载下输出的纳秒脉冲电压幅值约为充电电压的2倍。展开更多
为了推动脉冲功率技术的应用,研制了紧凑、可高重复频率运行的固态脉冲功率源。通过大功率固体开关及电路拓扑结构的比较,选择了基于光导开关的层叠Blumlein线型脉冲功率源这一技术路线。基于铁电陶瓷脉冲形成线和光导开关构建了大电流...为了推动脉冲功率技术的应用,研制了紧凑、可高重复频率运行的固态脉冲功率源。通过大功率固体开关及电路拓扑结构的比较,选择了基于光导开关的层叠Blumlein线型脉冲功率源这一技术路线。基于铁电陶瓷脉冲形成线和光导开关构建了大电流固态模块,光导开关通流能力超过4 k A。已经实现的应用包括:研制了200 k V/1 k A固态脉冲功率源并与反射二极管结合实现了重复频率为100 Hz或1 k Hz、脉冲宽度约40 ns的猝发X射线脉冲输出;利用基于光导开关的Blumlein线模块产生的快脉冲进行了血液病原体灭活初步研究,可得当脉冲个数为10个时,在80 k V/cm的电场作用下红细胞悬液中细菌的抑制率为57%。展开更多
Starting from the uniform disk current model, an analytical solution for the electromagnetic pulse axial energy radiation is derived and a physical meaning then given to the axial energy propagation characteristics of...Starting from the uniform disk current model, an analytical solution for the electromagnetic pulse axial energy radiation is derived and a physical meaning then given to the axial energy propagation characteristics of a unit antenna. From this solution, a point-source approximation model in the time domain is introduced. Parameters such as the energy propagation characteristics and beamwidth of the electromagnetic pulse beam radiating from arrayed antenna are analyzed theoretically. An arrayed transient electromagnetic pulse generator is developed incorporating a 23×16 ultra-wideband tapered slot antenna integrated with a Blumlein formation line and photoconductive semiconductor switch. Experiments performed over a 2.5 km range confirm that the arrayed transient electromagnetic pulse can propagate in free space with the specified waveform. Moreover, the field components can be superposed in phase, and the radiation beam can be focused into a single pulse. Results from calculations are in agreement with experimental results within the measurement uncertainties.展开更多
文摘为制作生物医学用小型化、紧凑型ns脉冲发生器,结合非平衡Blumlein型多层微带传输线和固态开关技术,研制了一台基于非平衡Blumlein型传输线的全固态高压纳秒脉冲发生器。通过波传播过程分析非平衡Blumlein型多层微带传输线方波形成原理;介绍了相关固态开关的控制时序及其'截波'策略,以此实现50~100 ns的方波脉冲脉宽可调;阐释了非平衡Blumlein型多层微带传输线系统的负载阻抗可变的相关原理;并研制了一台小型纳秒脉冲发生器以进行相关性能测试。最终,在50Ω负载下的纳秒脉冲电压参数:幅值0~2 k V可调、脉宽50~100 ns可调、重复频率0~1 k Hz可调,上升时间约20 ns;此外,测试了500Ω负载下输出的纳秒脉冲电压幅值约为充电电压的2倍。
文摘为了推动脉冲功率技术的应用,研制了紧凑、可高重复频率运行的固态脉冲功率源。通过大功率固体开关及电路拓扑结构的比较,选择了基于光导开关的层叠Blumlein线型脉冲功率源这一技术路线。基于铁电陶瓷脉冲形成线和光导开关构建了大电流固态模块,光导开关通流能力超过4 k A。已经实现的应用包括:研制了200 k V/1 k A固态脉冲功率源并与反射二极管结合实现了重复频率为100 Hz或1 k Hz、脉冲宽度约40 ns的猝发X射线脉冲输出;利用基于光导开关的Blumlein线模块产生的快脉冲进行了血液病原体灭活初步研究,可得当脉冲个数为10个时,在80 k V/cm的电场作用下红细胞悬液中细菌的抑制率为57%。
基金supported by the National Natural Science Foundation of China (10804016)the Electromagnetic Pulse Technology and Investigation (RY0504)
文摘Starting from the uniform disk current model, an analytical solution for the electromagnetic pulse axial energy radiation is derived and a physical meaning then given to the axial energy propagation characteristics of a unit antenna. From this solution, a point-source approximation model in the time domain is introduced. Parameters such as the energy propagation characteristics and beamwidth of the electromagnetic pulse beam radiating from arrayed antenna are analyzed theoretically. An arrayed transient electromagnetic pulse generator is developed incorporating a 23×16 ultra-wideband tapered slot antenna integrated with a Blumlein formation line and photoconductive semiconductor switch. Experiments performed over a 2.5 km range confirm that the arrayed transient electromagnetic pulse can propagate in free space with the specified waveform. Moreover, the field components can be superposed in phase, and the radiation beam can be focused into a single pulse. Results from calculations are in agreement with experimental results within the measurement uncertainties.
