纳秒脉冲宽度对介质阻挡放电图像对比度的影响  

Influence of Nanosecond Pulse Width on the Contrast of Dielectric Barrier Discharge Image

作　　者：翁明[1] 徐伟军[1] 郑华[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《光电子．激光》2006年第10期1269-1271,共3页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(50077015;50477027)

摘　　要：采用4.7、7.6和10.6 ns 3种不同宽度的高压脉冲,对硬币进行了介质阻挡放电照相(DBDP)。结果表明,介质阻挡放电图像的对比度明显与脉冲宽度有关,脉冲宽度越窄,图像的对比度越高;反之,脉冲宽度越宽,图像对比度越差。对DBDP的分析表明,外电压施加在硬币上后,与放电电流脉冲对应的时间滞后与放电间隙有关。采用放电时间滞后的观点,就纳秒脉冲宽度对介质阻挡放电图像对比度的影响进行了合理的解释。Three images of a coin are obtained by use of dielectric barrier discharge photography（DBDP） with the nanosecond pulse width of 4.7 ns, 7.6 ns and 10.6 ns respectively. The result shows that with the increase of pulse width, the image contrast decreases. Based on the mechanism of DBDP, it is analyzed that after power is applied to the coin,the time lag of the discharge current pulse has a close relationship to the discharge gap. Then, the influence of nanosecond pulse width on the contrast of dielectric barrier discharge image is explained reasonably by the time lag.

关 键 词：图像 对比度 介质阻挡放电 纳秒脉冲 

分 类 号：TN249[电子电信—物理电子学]