Frontiers of Mechanical Engineering
>> 2019,
Volume 14,
Issue 3
doi:
10.1007/s11465-018-0495-9
REVIEW ARTICLE
Progress in terahertz nondestructive testing: A review
Laboratory of Optics, Terahertz and Non-Destructive Testing, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China; School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China
Accepted: 2018-05-21
Available online: 2018-05-21
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Abstract
Terahertz (THz) waves, whose frequencies range between microwave and infrared, are part of the electromagnetic spectrum. A gap exists in THz literature because investigating THz waves is difficult due to the weak characteristics of the waves and the lack of suitable THz sources and detectors. Recently, THz nondestructive testing (NDT) technology has become an interesting topic. This review outlines several typical THz devices and systems and engineering applications of THz NDT techniques in composite materials, thermal barrier coatings, car paint films, marine protective coatings, and pharmaceutical tablet coatings. THz imaging has higher resolution but lower penetration than ultrasound imaging. This review presents the significance and advantages provided by the emerging THz NDT technique.
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