AI Article Synopsis
- The paper discusses advancements in terahertz frequency modulation continuous-wave (THz FMCW) imaging technology, specifically focusing on its application in non-destructive testing.
- A new 150-220 GHz FMCW Bessel beam imaging system is introduced, which significantly improves depth of field and lateral resolution compared to traditional Gaussian beam systems.
- Additionally, a novel image restoration algorithm is proposed to further enhance image quality by addressing issues related to convolution effects, ultimately validating the system's advantages through practical imaging results.
Article Abstract
The terahertz frequency modulation continuous-wave (THz FMCW) imaging technology has been widely used in non-destructive testing applications. However, THz FMCW real-aperture radar usually has a small depth of field and poor lateral resolution, thus restricting the high-precision imaging application. This paper proposes a 150-220 GHz FMCW Bessel beam imaging system, effectively doubling the depth of field and unifying the lateral resolution compared to the Gaussian beam quasi-optical system. Moreover, a THz image restoration algorithm based on local gradients and convolution kernel priors is proposed to eliminate further the convolution effect introduced by the Bessel beam, thereby enhancing the lateral resolution to 2 mm. It effectively improves the image under-restoration or over-restoration caused by the mismatch between the ideal and actual point spread function. The imaging results of the resolution test target and semiconductor device verify the advantages of the proposed system and algorithm.
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| http://dx.doi.org/10.1364/AO.493964 | DOI Listing |
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