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	Broadband stepped-frequency modulated continuous terahertz wave tomography for non-destructive inspection of polymer materials
	Zhang, Xiaoxuan1; Guo, Qijia1; Chang, Tianying1,2; Cui, Hong-Liang1,3
	2019-07-01
摘要	An all-solid-state electronic three-dimensional terahertz tomography system designed specifically for non-destructive inspection of polymer materials is demonstrated, which is capable of determining the positions and shapes of hidden defects accurately. The imaging radar system, based on stepped-frequency modulated continuous wave (SFMCW), with center frequency at 180 GHz, bandwidth of 60 GHz, and average power 0.5 mW, is tested against thick Teflon (polytetrafluoroethylene, PTFE) plates with internal voids as samples. The locations and shapes of the hidden holes are obtained in both electromagnetic simulation and experimental measurements with a three-dimensional image reconstruction algorithm, which features advantages of accurate reconstructed image details and fast computation speed, demonstrating that the terahertz imaging radar system combined with the algorithm developed is capable of detecting internal defects of thick polymers. Key resolution parameters are established experimentally in detail, demonstrating 2.5 mm and 1.7 mm range resolutions in free space and in Teflon separately, and lateral spot diameters ranging from 3.4 mm to 8 mm at imaging distances from 5 mm to 60 mm.
关键词	Internal nondestructive testing Polymer Tomography Stepped-frequency modulated continuous terahertz wave 3D reconstruction algorithm
DOI	10.1016/j.polymertesting.2019.04.001
发表期刊	POLYMER TESTING
ISSN	0142-9418
卷号	76页码:455-463
通讯作者	Chang, Tianying(tchang@jlu.edu.cn)
收录类别	SCI
WOS记录号	WOS:000479182700049
语种	英语