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压电换能器的超声检测技术,面临着新的挑战,这就是自七十年代中期发展起来的一项新技术──激光超声。激光超声引起了西德、日本、美、英等无损检测界的极大关注,竞相研制激光超声检测系统,其原因在于激光超声能以非接触方式对物体进行连续快速的自动检测,并能对形状十分复杂的物体进行全方位检测,如处在高温、高压、有毒和放射性等各种危险和恶劣环境内的物体。本文将论述激光超声的特性、基本原理、实验进展和应用前景。
Ultrasonic testing of piezoelectric transducers faces new challenges, a new technology developed since the mid-1970s - laser ultrasound. Laser ultrasound has caused great concern in non-destructive testing community in West Germany, Japan, the United States, and Britain. The reason for this is that laser ultrasonic can detect objects continuously and rapidly in a non-contact manner, Objects of very complex shape are tested in all aspects, such as objects in dangerous and harsh environments such as high temperature, high pressure, toxic and radioactive. This article discusses the characteristics of laser ultrasound, the basic principles, experimental progress and application prospects.