【摘要】 利用介质阻挡放电照相的原理,成功实现了对人体指纹的提取。在静态法提取指纹过程中,记录了在3种脉冲宽度(2ns,3μs,1ms)下放电的指纹图像。放电空间电场分布的分析表明,随着脉冲宽度的增加,正离子在介质层上的累积使得放电空间的电场趋于均匀,导致指纹放电强度在空间的均匀化,从而使指纹成像的分辨率下降。采用较高幅度的ns脉冲放电时,发现了指纹放电中存在丝状放电的痕迹。进一步的实验表明,即使在放电空间不存在介质时,也能观测到良好质量的指纹放电图像。研究结果表明,采用较小幅度的ns脉冲放电技术,不仅提高了指纹图像的清晰度,而且也实现了大气中的辉光放电。更多还原

【Abstract】 The human′s fingerprint was acquired by using the dielectric barrier discharge photography technology.In the static state method of fingerprint acquirement,three discharge images for the applied voltage pulse width of 2 ns,3 μs and 1 ms were recorded.Because of the positive ions cumulated on the dielectric film,the discharge gap electric field intension trends uniformly,and the fingerprint discharge intension is also tends uniformly in space.This results in a weakened fingerprint image definition.When the use of the nanosecond pulse with higher amplitude,the filamentary discharge was discovered.Farther,even the absent of dielectric film in the discharge space,the good quality fingerprint discharge image was observed.The research results shows that by using the lower amplitude ns pulse,the fingerprint image definition was improved,and the atmosphere pressure glow discharge was obtained.更多还原