Progress in terahertz nondestructive testing: A review

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. Recent...

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Bibliographic Details
Published in:Frontiers of Mechanical Engineering 2019-09, Vol.14 (3), p.273-281
Main Author: ZHONG, Shuncong
Format: Article
Language:English
Subjects:
composite material
Engineering
Mechanical Engineering
nondestructive testing (NDT)
Review Article
terahertz pulsed imaging (TPI)
thermal barrier coating
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Summary: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.
ISSN:2095-0233
2095-0241
DOI:10.1007/s11465-018-0495-9