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Benchmarking a commercial (Sub-)THz focal plane array against a custom-built millimeter-wave single-pixel camera

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Title: Benchmarking a commercial (Sub-)THz focal plane array against a custom-built millimeter-wave single-pixel camera
Authors: Shin, S
Lucyszyn, S
Item Type: Journal Article
Abstract: For the first time, the characteristics of an evolving commercial camera technology that can operate at millimeter-wave frequencies has been independently investigated. In this work, we benchmark the TeraSense camera against a custom-built single-pixel camera at W-band, for image quality and aperture reflectance. It is found that the Tera-1024 TeraSense camera exhibits limited image resolution and fidelity, with significant levels of systematic spatial noise. In a poor signal-to-noise ratio scenario, the addition of random noise exacerbates these problems. Possible causes of both beam and image distortion have been identified in quasi-optical applications, which gives important insight into the best use of (sub-)THz cameras and interpretation of their images. Inherent standing waves caused by the significant power reflectance of the camera aperture is investigated in detail. A simple W-band one-port quasi-optical scalar network analyzer is developed, to determine the levels of reflectance for both cameras, with its bespoke calibration routine derived from first principles - providing a low-cost solution for many non-destructive testing applications. It is found that the TeraSense camera (with additional RAM) and single-pixel camera (having default RAM) have measured reflectance values of 27% and 3%, respectively, over a corresponding aperture area ratio of approximately 714:1. While our single-pixel camera provides excellent image resolution and fidelity, it inherently suffers from very slow raster-scanning speeds and operational bandwidth limitations. For this reason, the TeraSense camera technology is excellent for performing qualitative measurements in real time, with the caveats outlined in this paper.
Issue Date: 13-Oct-2020
Date of Acceptance: 9-Oct-2020
URI: http://hdl.handle.net/10044/1/84753
DOI: 10.1109/ACCESS.2020.3030617
ISSN: 2169-3536
Publisher: Institute of Electrical and Electronics Engineers
Start Page: 191174
End Page: 191190
Journal / Book Title: IEEE Access
Volume: 8
Copyright Statement: © 2020 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: UK Space Agency
UK Space Agency
UK Space Agency
Funder's Grant Number: CT11834
PO No: 454400
Keywords: 08 Information and Computing Sciences
09 Engineering
10 Technology
Publication Status: Published
Open Access location: https://ieeexplore.ieee.org/document/9222137
Online Publication Date: 2020-10-13
Appears in Collections:Electrical and Electronic Engineering

This item is licensed under a Creative Commons License Creative Commons