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本文对于激光超声、干耦合和空气耦合三种非接触超声C-扫描技术的原理、特点及其在复合材料检测中的应用做了简明介绍．
In this paper, the principle, characteristics and application of three non-contact ultrasound C-scan techniques of laser ultrasound, dry coupling and air coupling are briefly introduced.