基于基准试块的DR数字射线尺寸精确测量方法  

The accurate dimension measurement method of Digital Radiography based on reference blocks

作　　者：马海全 李春凯 甘勇 范洪涛 李秋生 丁宁 MA Hai-quan;LI Chun-kai;GAN Yong;FAN Hong-taoLI Qiu-sheng;DING Ning(Key Laboratory of Materials Testing and Evaluation of China Aviation Engine Group,Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing Institute of Aeronautical Materials Research of China Aerospace Development,Beijing 100095,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]中国航发北京航空材料研究院航空材料检测与评价北京市重点实验室、中国航空发动机集团材料检测与评价重点实验室,北京100095 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2025年第2期17-22,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(52365048);2024年高校科研创新平台重大培育项目(2024CXPT-06)。

摘　　要：对于DR检测技术而言,射线源焦点尺寸、几何放大倍数、探测器像素尺寸以及图像标定基准尺寸是影响DR检测技术尺寸测量精度的关键因素,为此,通过单一变量法的DR试验研究并定性分析了上述4个因素对尺寸定量测量误差的影响规律,在此基础上提出了一种基于缺陷尺寸选择基准试块的高精度尺寸定量方法,并在实际工件上进行了验证.结果表明:射线源焦点尺寸、探测器像素尺寸与定量测量误差成正比,而几何放大倍数与测量误差呈现出先减小后趋于平稳的趋势;单个像素的实际物理尺寸与基准尺寸直接相关,在DR图像质量符合检测标准要求的前提下,基准尺寸越接近实际缺陷尺寸,定量测量误差越小,通过选择合适的基准试块可将测量误差控制在±0.05 mm以内.For DR detection technology,the size of the X-ray source focus,geometric magnification,detector pixel size,and image calibration reference size are key factors affecting the measurement accuracy of DR detection technology.Therefore,through DR experiments based on a single variable method,the influence law of the above four factors on the measurement error of size quantification was qualitatively analyzed.On this basis,a high-precision size quantitative method based on defect size selection of benchmark blocks was proposed and verified by experiments on actual workpieces.The results showed that the size of the X-ray source focus and detector pixel size are proportional to the quantitative measurement error,while the geometric magnification shows a trend of decreasing first and then tending to be regionally stable with the measurement error.The actual physical size of a single pixel is directly related to the reference size.Under the premise that DR image quality meets detection standard requirements,the closer the reference size is to the actual defect size,the lower the quantitative measurement error will be.By selecting appropriate benchmark blocks,measurement errors can be effectively controlled within±0.05 mm.

关 键 词：DR检测技术 尺寸定量测量 射线源焦点 几何放大倍数 探测器像素 测量误差 

分 类 号：TG115.281[金属学及工艺—物理冶金]