红外热成像技术在建筑工程领域具有十分广阔的应用前景。采用H2640型红外热像仪和NS9200 Report Generator分析软件对利用红外热成 像技术检测外墙空鼓时的影响因素进行了归纳和分析。通过探讨天气、拍摄角度和图片分析软件对检测结果的影响，提出了拍摄红外图像的最佳 时间，确定了最佳拍摄角度；对图片分析软件的误判因素和level&span的范围标定等进行了分析，并提出了相应的处理措施。

Infrared thermal imaging technology has a wide application prospect in the field of building engineering. The influence factors in wall hollow defect detection by infrared thermal imaging are summed up and analyzed by using a H2640 type infrared thermal imager and the NS9200 Report Generator software. The influence of weather, shooting angle and image analysis software on the detection result are discussed and hence the best shooting time and angle are determined. Finally, the misjudgment factors and level&span range calibration of the image analysis software are analyzed and the corresponding processing measures are proposed.