改进的射线照相成像检验技术细节识别理论  

Improved Theory on Detalis Discernibility for Radiography

作　　者：郑世才 ZHENG Shicai(Beijing 142-23 Box,Beijing 100854,China)

机构地区：[1]北京142信箱23分箱,北京100854

出　　处：《无损探伤》2021年第3期7-13,17,共8页Nondestructive Testing Technology

摘　　要：假设了细节可通过等体积转换为矩形截面细节,不清晰度对细节图像的影响可采用不清晰度对直缝细节图像影响给出。在此假设基础上,基于Rose定律与小厚度差射线照相图像对比度公式相结合,建立了细节识别一般关系式。以统一处理思路系统性地给出了典型细节的识别关系式,解决了过去文献细节识别关系式依赖于细节黑度分布曲线的实质性问题。新建立的细节识别关系式,对识别细节尺寸估计与试验符合较好,完善了射线照相成像检测技术基础理论。The assessment has been put forward that details section is related to a rectangulare section under the condition of equal volume and the effct of unsharpness on the details image is determined by the effct on rectangulate slit.The general theoretical equation of details discernibility has been developed,based on combining Rose law with the formula of image contrast of small thickness change on the assessment.The serial equations of typical details discernibility were systematically carried out according to unitized discussion way.The essential problem were removed that the success or failure of the equation of discernibility depend on image density curve of details in the foregoing related literatures.The estimation is in good agreement with the experiment dates for the size value of typical details from the new equations.The basic theory of radiography is perfect.

关 键 词：细节 缺陷 识别 缺陷检验 射线照相 

分 类 号：TG115.28[金属学及工艺—物理冶金]