前言无损检验领域中热像法的价值近五年来急剧增加,应用范围亦迅速扩大。进展迅速的主要原因之一是由于仪器本身有了很大改进。高速扫描器所必需的具有短时间常数的非常灵敏的探测器在当前有了实用价值。从而有可能制造出较以前快500到1000倍的仪器。除高速外温度响应和灵敏度均能满足要求。在以前的热像领域中使用红外扫描器的工作者用10～30分钟才能获得一张图片,而 Introduction The value of thermography in the field of nondestructive testing has risen sharply over the past five years and its scope of application has also rapidly expanded. One of the main reasons for the rapid progress is due to the great improvement in the instrument itself. Very sensitive detectors with short time constants necessary for high-speed scanners are of practical value today. It is therefore possible to make instruments 500 to 1000 times faster than before. In addition to high speed outside the temperature response and sensitivity can meet the requirements. Workers who used infrared scanners in previous thermal imaging fields used 10 to 30 minutes to get a picture, whereas