Development of infrared nondestructive testing system with laser scanning automatic heat lading

摘要

Considering laser scanning technique, infrared method and electronic technology, studied and designed a set of infrared NDT system with laser scanning automatic heat loading method in this paper. To make use of this device, it may detect internal defects of metal material parts, such as micro-craze, rarefaction, blowholes, etc. This paper also introduced the work principal of testing system. It heats automatically pretreatly to workpiece with CO{sub}2 laser scanning and through infrared technique received temperature field from workpiece heat conduction. After the fiter and the A/D converter system, the changed signal is sent into a single chip computer and the computer make it complete data analysis, data processing, save and display. Therefore, it can achieve detecting characteristic and property of internal defects of parts.