High-precision terahertz frequency modulated continuous wave imaging method using continuous wavelet transform

Yu Zhou; Tianyi Wang; Bing Dai; Wenjun Li; Wei Wang; Chengwu You; Kejia Wang; Jinsong Liu; Shenglie Wang; Zhengang Yang

doi:10.1117/1.OE.57.2.023108

26 February 2018 High-precision terahertz frequency modulated continuous wave imaging method using continuous wavelet transform

Yu Zhou, Tianyi Wang, Bing Dai, Wenjun Li, Wei Wang, Chengwu You, Kejia Wang, Jinsong Liu, Shenglie Wang, Zhengang Yang

Author Affiliations +

Optical Engineering, Vol. 57, Issue 2, 023108 (February 2018). https://doi.org/10.1117/1.OE.57.2.023108

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.

Citation Download Citation

Yu Zhou, Tianyi Wang, Bing Dai, Wenjun Li, Wei Wang, Chengwu You, Kejia Wang, Jinsong Liu, Shenglie Wang, and 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

Received: 24 August 2017; Accepted: 6 February 2018; Published: 26 February 2018

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