Nondestructive Detection Method for Drugs in the Medical Box Based on 3-D THz Imaging

Hu, Dahai; Nian, Fushun; Wang, Yahai

doi:10.1109/ucmmt45316.2018.9015811

Cited by 1 publication

(2 citation statements)

References 3 publications

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“…[6][7][8][9][10][11][12][13][14] Synthetic aperture arrays (SAAs) using unfocused beams are promising candidates to increase the spatial resolution of terahertz images while reducing the restrictions on target placement. [15][16][17][18][19][20][21][22][23][24][25][26] SAAs can obtain a substantially large aperture by moving the transmitting and/or receiving antennas, making it possible to scan the beam and reduce the beamwidth by signal processing. SAA has been widely used in various applications, including radar and ultrasonic sensing.…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20] Three-dimensional terahertz imaging using SAA has also been investigated. Hu demonstrated 3D imaging of drugs in a medical box, 25) and Zhang showed various 3D imaging results, including forms with coins or other metal objects inside, a number of plastic plates with different thicknesses, and a PTFE board with a hole. 26) The most common beamforming algorithm of SAA is scanning the main beam of the SAA using the phase-coherent property, which is referred to as the beamformer (BF) method.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Terahertz reflection imaging using virtual arrays and MUSIC in a synthetic aperture array

Cho¹,

Watakabe²,

Nakabayashi³

et al. 2021

Jpn. J. Appl. Phys.

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Terahertz imaging using synthetic aperture arrays (SAAs) is an attractive nondestructive measurement method, as it can increase the spatial resolution while reducing the restrictions on target placement. MUltiple SIgnal Classification (MUSIC), which is a high-resolution direction of arrival estimation method, is also attractive because it increases the resolution of terahertz imaging. However, the resolution of the MUSIC spatial spectrum deteriorates when correlated signals are received. Spatial smoothing (SS) can reduce the correlation of incoming waves; however, this technique is only applicable to equispaced linear arrays in plane wave reception environments. This paper introduces MUSIC with SS to THz imaging using an arcuate SAA by applying array interpolation using virtual arrays. The imaging results and position estimation accuracy using simulated or measured arcuate synthetic array responses of two metal wire targets demonstrate the effectiveness of the method compared with the conventional beamformer and MUSIC methods.

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