on the basis of increasing the flaw resolution of the x-ray radiographic system, the study is firstly concerned with the analysis made on the influence of such factors as redial sources energy, system noise, optics radiography and scattering on the radiographic system in theory, and the present dissertation looks at the methods for acquiring the radiographic system point sp read function, line spread function and module transfer function ( mtf ) . on the basis of these studies, research the spread properties of the tiny flaw making use of mtf, acquiring the properties of system inspecting sensitivity and resolution, based on the system optimization designing 本文以提高射線成像系統(tǒng)的疵病分辨率為前提,首先在理論上對射線源能量、系統(tǒng)噪聲、光學成像、散射等各環(huán)節(jié)對成像系統(tǒng)的影響進行分析,探討成像系統(tǒng)的點擴展函數(shù)、線擴展函數(shù)及其調制傳遞函數(shù)(moduletransferfunction,簡稱mtf)獲取方法,在此基礎上,利用mtf研究微小疵病的擴展特點,從而得到系統(tǒng)的檢測靈敏度和分辨率給出關系特性,為系統(tǒng)優(yōu)化設計提供依據。
after making sure the system mtf properties, increasing system inspecting sensitivity and resolution by image recovering is discussed, and research the inspecting methods of the tiny flaw being the abrupt change structure and the technology of the quantification inspection combining the problem of the shell gap 在系統(tǒng)mtf特性確定后,探討用圖像恢復的方法提高系統(tǒng)檢測靈敏度和分辨率,并結合炮彈底隙定量檢測問題研究突變結構處微小疵病的檢測方法和定量檢測技術。