@inproceedings{bbd29bab46bf4eecb0375976522b4c33,
title = "Identification of air gaps in terahertz reflection imaging and mitigation of spectral artifact using Hilbert transform",
abstract = "The applications of THz time-domain spectroscopy are rapidly growing in non-destructive testing and biomedical imaging. In many such applications, air gaps can naturally occur in a multi-layer sample geometry, which can alter the measured reflection spectra and thus influence the characterization of the sample. Here, we present an iterative computational algorithm based on the Hilbert transform and cross correlation to precisely calculate the thickness of the air gaps. Subsequently, by computationally removing the effects of the air gaps from the time-domain data in post-processing, the optical parameters of the sample can be extracted accurately.",
keywords = "cross-correlation, Hilbert transform, non-destructive testing, Terahertz time-domain spectroscopy",
author = "Arash Karimi and Harris, \{Zachery B.\} and Arbab, \{M. Hassan\}",
note = "Publisher Copyright: {\textcopyright} 2025 SPIE.; Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVIII 2025 ; Conference date: 27-01-2025 Through 30-01-2025",
year = "2025",
doi = "10.1117/12.3044023",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Sadwick, \{Laurence P.\} and Tianxin Yang",
booktitle = "Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVIII",
}