Yu Zhou, Tianyi Wang, Bing Dai, Wenjun Li, Wei Wang, Chengwu You, Kejia Wang, Jinsong Liu; Shenglie Wang, Zhengang Yang
https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-57/issue-2/023108/High-precision-terahertz-frequency-modulated-continuous-wave-imaging-method-using/10.1117/1.OE.57.2.023108.short?SSO=1
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.
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