Yanlin Zhao, Dayong Wang, Lu Rong, Yunxin Wang, Jie Zhao, Zhihao Xu
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10826/1082616/Encapsulated-morphology-measurement-based-on-continuous-wave-terahertz-reflective-off/10.1117/12.2501115.short
Terahertz nondestructive testing is an
increasingly important technology in recent years. Compared with visible and
infrared bands, terahertz wave can easily penetrate common nonpolar and
nonmetal materials without ironize the sample because of low energy. Digital
holography can reconstruct the quantitative amplitude and phase distributions
of the object wavefront. We proposed a continuous-wave terahertz reflective
off-axis digital holography to measure the morphology of encapsulated object.
An experimental system was built using a 2.52 THz (118.83 μm) far-infrared gas
laser 295-FIR and a pyroelectric array detector. The morphology of the metallic
bookmark hidden behind the optically opaque materials such as
polytetrafluoroethylene and Polypropylene plates were obtained by angular
spectrum integral and phase unwrapping algorithm. It proves that THz digital
holography is an effective nondestructive testing method.
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