Diffuse reflection imaging at terahertz frequencies for security applications

P. Dean; S. Khanna; S. Chakraborty; M. Lachab; A. G. Davies; E. H. Linfield

doi:10.1117/12.739281

Diffuse reflection imaging at terahertz frequencies for security applications

P. Dean
, S. Khanna
, S. Chakraborty
, M. Lachab
, A. G. Davies
, E. H. Linfield

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

Abstract

We report diffuse reflection imaging of concealed powdered samples in atmospheric air using a quantum cascade laser operating at 2.83 THz. The imaging system uses a helium-cooled silicon bolometer for mapping radiation diffusely reflected and scattered from samples, and a room-temperature pyroelectric sensor for simultaneously acquiring a specular image. A range of powders concealed within plastic packaging and standard FedEx® envelopes was imaged with a resolution of better than 0.5 mm, and it was possible to detect powdered samples concealed within packaging from which there was a strong component of surface reflection. The feasibility of performing dual-wavelength diffuse reflection imaging for identification of illicit drugs and explosives is discussed.

Original language	English
Title of host publication	Proceedings of SPIE - The International Society for Optical Engineering\|Proc SPIE Int Soc Opt Eng
Volume	6741
DOIs	https://doi.org/10.1117/12.739281
Publication status	Published - 2007
Event	Optics and Photonics for Counterterrorism and Crime Fighting III - Florence Duration: 1 Jul 2007 → …

Conference

Conference	Optics and Photonics for Counterterrorism and Crime Fighting III
City	Florence
Period	1/07/07 → …

Keywords

Drugs of abuse
Dual-wavelength imaging
Powders
Reflection imaging
Scattering
Terahertz

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10.1117/12.739281

Cite this

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title = "Diffuse reflection imaging at terahertz frequencies for security applications",

abstract = "We report diffuse reflection imaging of concealed powdered samples in atmospheric air using a quantum cascade laser operating at 2.83 THz. The imaging system uses a helium-cooled silicon bolometer for mapping radiation diffusely reflected and scattered from samples, and a room-temperature pyroelectric sensor for simultaneously acquiring a specular image. A range of powders concealed within plastic packaging and standard FedEx{\textregistered} envelopes was imaged with a resolution of better than 0.5 mm, and it was possible to detect powdered samples concealed within packaging from which there was a strong component of surface reflection. The feasibility of performing dual-wavelength diffuse reflection imaging for identification of illicit drugs and explosives is discussed.",

keywords = "Drugs of abuse, Dual-wavelength imaging, Powders, Reflection imaging, Scattering, Terahertz",

author = "P. Dean and S. Khanna and S. Chakraborty and M. Lachab and Davies, \{A. G.\} and Linfield, \{E. H.\}",

year = "2007",

doi = "10.1117/12.739281",

language = "English",

isbn = "9780819468994",

volume = "6741",

booktitle = "Proceedings of SPIE - The International Society for Optical Engineering|Proc SPIE Int Soc Opt Eng",

note = "Optics and Photonics for Counterterrorism and Crime Fighting III ; Conference date: 01-07-2007",

}

Dean, P, Khanna, S, Chakraborty, S, Lachab, M, Davies, AG & Linfield, EH 2007, Diffuse reflection imaging at terahertz frequencies for security applications. in Proceedings of SPIE - The International Society for Optical Engineering|Proc SPIE Int Soc Opt Eng. vol. 6741, Optics and Photonics for Counterterrorism and Crime Fighting III, Florence, 1/07/07. https://doi.org/10.1117/12.739281

TY - GEN

T1 - Diffuse reflection imaging at terahertz frequencies for security applications

AU - Dean, P.

AU - Khanna, S.

AU - Chakraborty, S.

AU - Lachab, M.

AU - Davies, A. G.

AU - Linfield, E. H.

PY - 2007

Y1 - 2007

N2 - We report diffuse reflection imaging of concealed powdered samples in atmospheric air using a quantum cascade laser operating at 2.83 THz. The imaging system uses a helium-cooled silicon bolometer for mapping radiation diffusely reflected and scattered from samples, and a room-temperature pyroelectric sensor for simultaneously acquiring a specular image. A range of powders concealed within plastic packaging and standard FedEx® envelopes was imaged with a resolution of better than 0.5 mm, and it was possible to detect powdered samples concealed within packaging from which there was a strong component of surface reflection. The feasibility of performing dual-wavelength diffuse reflection imaging for identification of illicit drugs and explosives is discussed.

AB - We report diffuse reflection imaging of concealed powdered samples in atmospheric air using a quantum cascade laser operating at 2.83 THz. The imaging system uses a helium-cooled silicon bolometer for mapping radiation diffusely reflected and scattered from samples, and a room-temperature pyroelectric sensor for simultaneously acquiring a specular image. A range of powders concealed within plastic packaging and standard FedEx® envelopes was imaged with a resolution of better than 0.5 mm, and it was possible to detect powdered samples concealed within packaging from which there was a strong component of surface reflection. The feasibility of performing dual-wavelength diffuse reflection imaging for identification of illicit drugs and explosives is discussed.

KW - Drugs of abuse

KW - Dual-wavelength imaging

KW - Powders

KW - Reflection imaging

KW - Scattering

KW - Terahertz

U2 - 10.1117/12.739281

DO - 10.1117/12.739281

M3 - Conference contribution

SN - 9780819468994

VL - 6741

BT - Proceedings of SPIE - The International Society for Optical Engineering|Proc SPIE Int Soc Opt Eng

T2 - Optics and Photonics for Counterterrorism and Crime Fighting III

Y2 - 1 July 2007

ER -

Diffuse reflection imaging at terahertz frequencies for security applications

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Keywords

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