中文摘要：

通过对微密度仪进行分析，采用了虚拟仪器技术将微密度仪记录笔的模拟信号转变为数字信号，应用通用软件VC＋＋为开发平台，设计了微密度仪测试系统。微密度仪测定的结果为光密度，需对其进行标定，标定结果表明：在样品厚度一定时，光密度与密度的相关系数为0．987；在样品密度均匀一致时，光密度与样品厚度的相关系数为0．956，呈高度线性相关；完全可以用光密度来测定物体密度、厚度及其均匀性。数字化开发提高了微密度仪的测定精度和工作效率。

英文摘要：

A micro-densimeter test system was developed based on virtual instruments technology. The analog signal of recording stylus in micro-densimeter is translated into digital signal. Visual C ＋＋ is employed as the development platform for virtual instruments. The micro-densimeter measurement result is optical density, its data need to be calibrated. Calibration results show that the correlation coefficient between optical density and the density is 0.987 for a definite sample thickness ; the correlation coefficient between optical density and sample thickness is 0. 956 when the samples have a uniform density. These relations have highly linear correlation, so optical density can be applied to measure the density, thickness and uniformity of the objects completely. The digital development of the system can improve the accuracy and efficiency of the micro-densimeter.