Study On Industrial Radiation Real-Time Imaging Testing Technology And Development Of High Performance Digital Radiography System

Industrial radiation real-time imaging testing technology is the new technology and developmental direction of non-destructive testing(NDT). The aim of this dissertation is to study the base of industrial radiation real-time imaging testing and to develop a high performance and lower cost digital real-time imaging system which can apply to high and low energy X-ray, this system is to apply non-destructive testing for workpiece of big or middle type.In this dissertation, first of all, the subject demands and international study status are introduced. The author studied and summarized the basic knowledge of radiation imaging NDT, including radial kind, characteristic and producing method, the basic theory of radiation imaging as well as influence factors, the choice method of technical parameter. The author analyzed and contrasted the advantage and disadvantage of various real-time imaging system, and put forward two evaluating methods of real-time imaging system.To the question of demands of the subject, the author put forward the project that develop the high performance digital imaging system (we named inspector) based on high resolution scintillation conversion screen and scientific grade camera. Scintillation screen is chosen, in order to save cost and satisfy the special demands, author developed the scientific grade CCD camera on the basis of the CCD chip, and developed the long distance pipeline image acquisition technology by using computer enhanced parallel port (EPP), and developed the corresponding circuits. The optic system and power circuits are design. Some Influencing imaging quality factors of this inspector are analyzed from theory to experiment, and corresponding calibration methods are put forward, including CCD dark current nonuniformity, CCD photon response nonuniformity, vignetting effect of optical system, converting screen nonuniformity of response to X-ray radiation.Experiments proved that the inspector developed by author achieved the demands of subject, this imaging system has some unique characteristics. Some shortages of study and works need for perfecting are indicated.