激光扫描红外热波成像技术在无损检测中的应用

Applications of the Laser Scanning Infrared Thermography for Nondestructive Testing

摘要: 对激光扫描热波成像技术与传统的闪光灯激励热波技术进行了比较, 介绍了一种基于激光扫描热波成像技术的新型红外无损检测设备, 通过试验对所建立的2-D理论模型进行验证, 试验结果表明, 当激光扫描速度在一定范围内, 样品表面温度场的变化服从一维热传导模式, 主要表现为厚样品的温度-时间曲线在双对数坐标中为斜率-0.5的直线, 与理论模型的结果相符合。并对两种特殊涂层的人工样品进行检测, 验证了激光扫描红外热波成像设备的有效性。

Abstract: A new active thermography system based on laser scanning technology is described. The system is compared with traditional flash lamp based approach. A 2-D temperature distribution model was examined with experimental results and the detection capability of the system was verified with some samples of special over coatings.