光点测试中的光点修复方法研究

Restoration of spot in precise spot measurement

针对在荫罩式彩色CRT器件的光点测试中 ,金属荫罩截获阴极束电流形成荧光屏上光点图像残缺 ,器件测试人员因此无法了解真实光点全貌 ,提出了一种有效的解决方案 .该方案基于微分原理 ,采用脉冲偏转微移动法实现电子束在小区间内的线性偏转 ,并同步采集屏上的光点信息 ,利用必要的图像处理技术 ,将多次采集到的残缺光点信息依次叠加 ,修复成为完整的原始光点 .该方案应用灵活 ,成本低廉 ,修复效果较好 ,测量精度较高 ,适用于对各种尺寸彩色CRT器件性能及显示图像质量的评价 .

An effective restoration method has been developed, which can be used to eliminate the influence of the shadow mask on the electron spot on the screen of a CRT. Observers can't get the full information of the beam profile because of the deformed spot. Based on differential theory, a micro stepping method deflects the electron beam linearly and grabs the spot images step by step. And the intact spot image can be restored from the original deformed images. The measurement results indicate that this method is accurate enough for designers of electron guns or deflection units to analyze all kinds of experimental tubes.