基于X射线的轮毂缺陷检测系统设计-英文文献.doc

APPLICATION IN NDT OF COMPUTER DIGITAL X-RAY REAL TIMEIMAGE SYSTEM Abstract Nondestructive testing (NDT) is one of the most commonly used scientific means to detect the internal defects without damaging the tested objects, therefore it is found widely applications in the industries of mechanical, petrochemical, aerospace etc. Radiographic Testing (RT) by X-ray is commonly used NDT method at present, its disadvantages are unavoidable for its long test period, high cost and environment pollution. With the development of computer technology, an emerging NDT method with digital X-ray real time image (DXRTI) is found increased application in industry. This paper presents the fundamentals and applications of computer numerical image technique (CNIT) in NDT with DXRTI technique, and introduced the new developed DXRTI software ‘XCX2000’ and its applications and economic benefit in weld defects detecting for LPG Cylinders. Keywords?? computer, software, Real Time Image, digital images processing, X-ray, NDT 1. Introduction The principle of NDT with DXRTI may be briefly expressed by the two conversions: After penetration of metal, X-ray signals was captured and converted into the visualized images by the Image Intensifier, which is called photoelectric conversion. The visualized images was shot by very fine resolution video camera and then was converted into digital image by Image Acquisition Card , which is called A/D conversion. The digital image was processed with computer and display the properties, dimension and location of the inside defects on screen. Finally, the defect grade was assessed according to the relevant codes and standards. The quality and effect of DXRTI is acceptably good compared with radiographic films, so that the later can be replaced by the former method. Moreover, with its much higher efficiency, lower cost, better inspection effectiveness, remoter transmission and much more convenience, DXRTI has prosperous future in the field of NDT. 2. System req