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红外热波检测技术是一种新兴的无损检测技术。与传统的被动式红外检测方法不同,该方法将外加瞬时或交变温场施加到被测物,通过红外热像设备监测被测物在外加温场下的表面温度变化。根据外加温场的类型及相应的物理模型对采集到的数据信号进行处理,以图像的形式显示。锁相热像技术使用周期的交变温场与锁相处理方法,具有检测面积大、对表面加热均匀性要求低等特点。与多数锁相红外检测使用的正弦型热源不同,对方波加热红外热像检测系统的原理及验证性实验进行了介绍,并将该系统应用于碳纤维层压板冲击损伤的检测。结果表明:方波加热的锁相热像检测系统结构简单,对厚度不大的试件具有相当好的检测效果。
Infrared heat wave detection technology is a new nondestructive testing technology. Different from the traditional passive infrared detection method, this method applies an instantaneous or alternating temperature field to the measured object, and monitors the surface temperature change of the measured object under the external heating field by the infrared thermal imaging device. According to the type of external heating field and the corresponding physical model of the collected data signal processing, image display. Phase-locked thermal imaging technology uses alternating cycles of temperature field and phase-locked processing method, with a detection area, the surface heating uniformity requirements of low and so on. Different from the sinusoidal heat source used in most of the phase-locked infrared detection, the principle and verification experiment of the square-wave infrared thermal imaging system are introduced. The system is applied to the detection of the impact damage of carbon fiber laminates. The results show that the square-wave heating phase-locking thermal imaging system has a simple structure and a good detection effect on specimens with small thickness.