26 February 2018 High-precision terahertz frequency modulated continuous wave imaging method using continuous wavelet transform
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Abstract
Inspired by the extensive application of terahertz (THz) imaging technologies in the field of aerospace, we exploit a THz frequency modulated continuous-wave imaging method with continuous wavelet transform (CWT) algorithm to detect a multilayer heat shield made of special materials. This method uses the frequency modulation continuous-wave system to catch the reflected THz signal and then process the image data by the CWT with different basis functions. By calculating the sizes of the defects area in the final images and then comparing the results with real samples, a practical high-precision THz imaging method is demonstrated. Our method can be an effective tool for the THz nondestructive testing of composites, drugs, and some cultural heritages.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yu Zhou, Yu Zhou, Tianyi Wang, Tianyi Wang, Bing Dai, Bing Dai, Wenjun Li, Wenjun Li, Wei Wang, Wei Wang, Chengwu You, Chengwu You, Kejia Wang, Kejia Wang, Jinsong Liu, Jinsong Liu, Shenglie Wang, Shenglie Wang, Zhengang Yang, Zhengang Yang, } "High-precision terahertz frequency modulated continuous wave imaging method using continuous wavelet transform," Optical Engineering 57(2), 023108 (26 February 2018). https://doi.org/10.1117/1.OE.57.2.023108 . Submission: Received: 24 August 2017; Accepted: 6 February 2018
Received: 24 August 2017; Accepted: 6 February 2018; Published: 26 February 2018
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