School of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Sensors (Basel). 2011;11(8):7773-98. doi: 10.3390/s110807773. Epub 2011 Aug 8.
Optical non-destructive testing (NDT) has gained more and more attention in recent years, mainly because of its non-destructive imaging characteristics with high precision and sensitivity. This paper provides a review of the main optical NDT technologies, including fibre optics, electronic speckle, infrared thermography, endoscopic and terahertz technology. Among them, fibre optics features easy integration and embedding, electronic speckle focuses on whole-field high precision detection, infrared thermography has unique advantages for tests of combined materials, endoscopic technology provides images of the internal surface of the object directly, and terahertz technology opens a new direction of internal NDT because of its excellent penetration capability to most of non-metallic materials. Typical engineering applications of these technologies are illustrated, with a brief introduction of the history and discussion of recent progress.
光学无损检测（NDT）近年来受到越来越多的关注，主要是因为其具有高精度和高灵敏度的非破坏性成像特性。本文综述了主要的光学 NDT 技术，包括光纤、电子散斑、红外热成像、内窥镜和太赫兹技术。其中，光纤具有易于集成和嵌入的特点，电子散斑专注于全场高精度检测，红外热成像在复合材料测试方面具有独特的优势，内窥镜技术提供物体内部表面的直接图像，而太赫兹技术因其对大多数非金属材料的优异穿透能力而开辟了内部 NDT 的新方向。本文介绍了这些技术的典型工程应用，并简要介绍了它们的历史和近期进展。
