期刊
SENSORS
卷 16, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/s16060875
关键词
carbon fiber reinforced polymer composites; fire-retardant coatings; nondestructive evaluation; coating debonding; terahertz time-domain spectroscopy imaging
资金
- Chinese Ministry of Science Technology [2015CB755401, 2012BAK04B03, 2014CB46505]
- Chongqing Science and Technology Commission [CSTC2013yykfC00007, CSTC2013jcyjC00001]
Terahertz (THz) time-domain spectroscopy (TDS) imaging is considered a nondestructive evaluation method for composite materials used for examining various defects of carbon fiber reinforced polymer (CFRP) composites and fire-retardant coatings in the reflective imaging modality. We demonstrate that hidden defects simulated by Teflon artificial inserts are imaged clearly in the perpendicular polarization mode. The THz TDS technique is also used to measure the thickness of thin fire-retardant coatings on CFRP composites with a typical accuracy of about 10 micrometers. In addition, coating debonding is successfully imaged based on the time-delay difference of the time-domain waveforms between closely adhered and debonded sample locations.
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