摘要
针对工业CT尺寸测量过程受影响因素较多、测量精度稳定性差的实际问题,设计一种基于中心距像素标定的工业CT尺寸精确测量方法。测定CT图像不同区域内的噪声方差等级分析噪声分布规律,提出双线测量方法对CT像素尺寸进行数值标定计算,获得不同中心距与像素尺寸的对应关系曲线,根据测量长度经过的图像中像素尺寸变化进行累计计算,获得实际长度值。利用6 Me V线阵探测器高能工业CT系统,对标准量块进行尺寸测量试验。结果表明,相比于传统"半高宽法",本实验方法在尺寸测量精度和稳定性上均有较大提高,从而为提升工业CT在尺寸测量水平提供新的方法和技术途径。
Aiming at the practical problems of poor accuracy and stability of dimension measurement of the industrial CT size measurement process, an accurate measurement method of industrial CT size based on center-to-pixel calibration was designed. Firstly, the noise distribution of noise variance in different regions of CT images was measured, the two-line measurement method was used to calculate the CT pixel size, and the corresponding relationship between the center distance and the pixel size was obtained. The actual length was obtained by accumulating the pixel size in the image length. The standard block size measurement test was carried out using 6 MeV linear array detector high-energy industrial CT system. The results show that compared with the traditional ＂full width at half maximum＂, the experimental method has greatly improved the accuracy and stability of the dimension measurement, so as to provide a new method and technical way to enhance the industrial CT in the dimension measurement level.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2017年第5期122-126,共5页
Ordnance Material Science and Engineering
基金
国家自然科学基金(61471411)
浙江省自然科学基金(LQ15E010003)
宁波国际科技合作项目(2015D10005)
宁波市自然科学基金项目(2016A610247)
关键词
工业CT
尺寸测量
半高宽法
评估
industrial CT
dimension measurement
full width at half maximum
evaluation
