High range resolution wideband terahertz FMCW radar with a large depth of field

Weidong Hu; Zhihao Xu; Huanyu Jiang; Yang Liu; Zhiyu Yao; Kaiqi Zhang; Leo P. Ligthart

doi:10.1364/AO.465647

High range resolution wideband terahertz FMCW radar with a large depth of field

Weidong Hu, Zhihao Xu^*, Huanyu Jiang, Yang Liu, Zhiyu Yao, Kaiqi Zhang, Leo P. Ligthart

^*Corresponding author for this work

School of Integrated Circuits and Electronics

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Terahertz frequency modulation continuous wave (THz FMCW) imaging technology has been widely used in non-destructive testing (NDT) applications of non-metallic materials. However, THz FMCW real-aperture radar usually has a narrow bandwidth and small depth of field, thus restricting the application of THz FMCW NDT. In this paper, a wideband THz signal (220–500 GHz) generation method is proposed by time-division multiplexing. Moreover, a dual-band quasi-optical design with a large depth of field is proposed based on the THz Bessel beam, and a high-quality range profile is obtained. Especially, a signal fusion extended Fourier analysis algorithm without prior knowledge is proposed to further enhance the range profile accuracy, which improves the range resolution to 0.28 mm (λ/3, center frequency 360 GHz). The effectiveness and advantages of the proposed system are verified by artificially constructing composite materials.

Original language	English
Pages (from-to)	7189-7196
Number of pages	8
Journal	Applied Optics
Volume	61
Issue number	24
DOIs	https://doi.org/10.1364/AO.465647
Publication status	Published - 20 Aug 2022

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title = "High range resolution wideband terahertz FMCW radar with a large depth of field",

abstract = "Terahertz frequency modulation continuous wave (THz FMCW) imaging technology has been widely used in non-destructive testing (NDT) applications of non-metallic materials. However, THz FMCW real-aperture radar usually has a narrow bandwidth and small depth of field, thus restricting the application of THz FMCW NDT. In this paper, a wideband THz signal (220–500 GHz) generation method is proposed by time-division multiplexing. Moreover, a dual-band quasi-optical design with a large depth of field is proposed based on the THz Bessel beam, and a high-quality range profile is obtained. Especially, a signal fusion extended Fourier analysis algorithm without prior knowledge is proposed to further enhance the range profile accuracy, which improves the range resolution to 0.28 mm (λ/3, center frequency 360 GHz). The effectiveness and advantages of the proposed system are verified by artificially constructing composite materials.",

author = "Weidong Hu and Zhihao Xu and Huanyu Jiang and Yang Liu and Zhiyu Yao and Kaiqi Zhang and Ligthart, {Leo P.}",

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language = "English",

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T1 - High range resolution wideband terahertz FMCW radar with a large depth of field

AU - Hu, Weidong

AU - Xu, Zhihao

AU - Jiang, Huanyu

AU - Liu, Yang

AU - Yao, Zhiyu

AU - Zhang, Kaiqi

AU - Ligthart, Leo P.

PY - 2022/8/20

Y1 - 2022/8/20

N2 - Terahertz frequency modulation continuous wave (THz FMCW) imaging technology has been widely used in non-destructive testing (NDT) applications of non-metallic materials. However, THz FMCW real-aperture radar usually has a narrow bandwidth and small depth of field, thus restricting the application of THz FMCW NDT. In this paper, a wideband THz signal (220–500 GHz) generation method is proposed by time-division multiplexing. Moreover, a dual-band quasi-optical design with a large depth of field is proposed based on the THz Bessel beam, and a high-quality range profile is obtained. Especially, a signal fusion extended Fourier analysis algorithm without prior knowledge is proposed to further enhance the range profile accuracy, which improves the range resolution to 0.28 mm (λ/3, center frequency 360 GHz). The effectiveness and advantages of the proposed system are verified by artificially constructing composite materials.

AB - Terahertz frequency modulation continuous wave (THz FMCW) imaging technology has been widely used in non-destructive testing (NDT) applications of non-metallic materials. However, THz FMCW real-aperture radar usually has a narrow bandwidth and small depth of field, thus restricting the application of THz FMCW NDT. In this paper, a wideband THz signal (220–500 GHz) generation method is proposed by time-division multiplexing. Moreover, a dual-band quasi-optical design with a large depth of field is proposed based on the THz Bessel beam, and a high-quality range profile is obtained. Especially, a signal fusion extended Fourier analysis algorithm without prior knowledge is proposed to further enhance the range profile accuracy, which improves the range resolution to 0.28 mm (λ/3, center frequency 360 GHz). The effectiveness and advantages of the proposed system are verified by artificially constructing composite materials.

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JO - Applied Optics

JF - Applied Optics

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High range resolution wideband terahertz FMCW radar with a large depth of field

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