Detection of concealed and buried chemicals by using multifrequency excitations

Yaohui Gao, Meng Ku Chen, Chia En Yang, Yun Ching Chang, Jim Yao, Jiping Cheng, Shizhuo Yin, Rongqing Hui, Paul Ruffin, Christina Brantley, Eugene Edwards, Claire Luo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this paper, we present a new type of concealed and buried chemical detection system by stimulating and enhancing spectroscopic signatures with multifrequency excitations, which includes a low frequency gradient dc electric field, a high frequency microwave field, and higher frequency infrared (IR) radiations. Each excitation frequency plays a unique role. The microwave, which can penetrate into the underground and/or pass through the dielectric covers with low attenuation, could effectively transform its energy into the concealed and buried chemicals and increases its evaporation rate from the sample source. Subsequently, a gradient dc electric field, generated by a Van De Graaff generator, not only serves as a vapor accelerator for efficiently expediting the transportation process of the vapor release from the concealed and buried chemicals but also acts as a vapor concentrator for increasing the chemical concentrations in the detection area, which enables the trace level chemical detection. Finally, the stimulated and enhanced vapors on the surface are detected by the IR spectroscopic fingerprints. Our theoretical and experimental results demonstrate that more than sixfold increase in detection signal can be achieved by using this proposed technology. The proposed technology can also be used for standoff detection of concealed and buried chemicals by adding the remote IR and/or thermal spectroscopic and imaging detection systems.

Original languageEnglish (US)
Article number043106
JournalJournal of Applied Physics
Volume108
Issue number4
DOIs
StatePublished - Aug 15 2010

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chemical detection
vapors
excitation
microwaves
gradients
electric fields
evaporation rate
signal detection
concentrators
infrared radiation
accelerators
generators
attenuation
signatures
low frequencies
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Gao, Y., Chen, M. K., Yang, C. E., Chang, Y. C., Yao, J., Cheng, J., ... Luo, C. (2010). Detection of concealed and buried chemicals by using multifrequency excitations. Journal of Applied Physics, 108(4), [043106]. https://doi.org/10.1063/1.3474651
Gao, Yaohui ; Chen, Meng Ku ; Yang, Chia En ; Chang, Yun Ching ; Yao, Jim ; Cheng, Jiping ; Yin, Shizhuo ; Hui, Rongqing ; Ruffin, Paul ; Brantley, Christina ; Edwards, Eugene ; Luo, Claire. / Detection of concealed and buried chemicals by using multifrequency excitations. In: Journal of Applied Physics. 2010 ; Vol. 108, No. 4.
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Gao, Y, Chen, MK, Yang, CE, Chang, YC, Yao, J, Cheng, J, Yin, S, Hui, R, Ruffin, P, Brantley, C, Edwards, E & Luo, C 2010, 'Detection of concealed and buried chemicals by using multifrequency excitations', Journal of Applied Physics, vol. 108, no. 4, 043106. https://doi.org/10.1063/1.3474651

Detection of concealed and buried chemicals by using multifrequency excitations. / Gao, Yaohui; Chen, Meng Ku; Yang, Chia En; Chang, Yun Ching; Yao, Jim; Cheng, Jiping; Yin, Shizhuo; Hui, Rongqing; Ruffin, Paul; Brantley, Christina; Edwards, Eugene; Luo, Claire.

In: Journal of Applied Physics, Vol. 108, No. 4, 043106, 15.08.2010.

Research output: Contribution to journalArticle

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AU - Gao, Yaohui

AU - Chen, Meng Ku

AU - Yang, Chia En

AU - Chang, Yun Ching

AU - Yao, Jim

AU - Cheng, Jiping

AU - Yin, Shizhuo

AU - Hui, Rongqing

AU - Ruffin, Paul

AU - Brantley, Christina

AU - Edwards, Eugene

AU - Luo, Claire

PY - 2010/8/15

Y1 - 2010/8/15

N2 - In this paper, we present a new type of concealed and buried chemical detection system by stimulating and enhancing spectroscopic signatures with multifrequency excitations, which includes a low frequency gradient dc electric field, a high frequency microwave field, and higher frequency infrared (IR) radiations. Each excitation frequency plays a unique role. The microwave, which can penetrate into the underground and/or pass through the dielectric covers with low attenuation, could effectively transform its energy into the concealed and buried chemicals and increases its evaporation rate from the sample source. Subsequently, a gradient dc electric field, generated by a Van De Graaff generator, not only serves as a vapor accelerator for efficiently expediting the transportation process of the vapor release from the concealed and buried chemicals but also acts as a vapor concentrator for increasing the chemical concentrations in the detection area, which enables the trace level chemical detection. Finally, the stimulated and enhanced vapors on the surface are detected by the IR spectroscopic fingerprints. Our theoretical and experimental results demonstrate that more than sixfold increase in detection signal can be achieved by using this proposed technology. The proposed technology can also be used for standoff detection of concealed and buried chemicals by adding the remote IR and/or thermal spectroscopic and imaging detection systems.

AB - In this paper, we present a new type of concealed and buried chemical detection system by stimulating and enhancing spectroscopic signatures with multifrequency excitations, which includes a low frequency gradient dc electric field, a high frequency microwave field, and higher frequency infrared (IR) radiations. Each excitation frequency plays a unique role. The microwave, which can penetrate into the underground and/or pass through the dielectric covers with low attenuation, could effectively transform its energy into the concealed and buried chemicals and increases its evaporation rate from the sample source. Subsequently, a gradient dc electric field, generated by a Van De Graaff generator, not only serves as a vapor accelerator for efficiently expediting the transportation process of the vapor release from the concealed and buried chemicals but also acts as a vapor concentrator for increasing the chemical concentrations in the detection area, which enables the trace level chemical detection. Finally, the stimulated and enhanced vapors on the surface are detected by the IR spectroscopic fingerprints. Our theoretical and experimental results demonstrate that more than sixfold increase in detection signal can be achieved by using this proposed technology. The proposed technology can also be used for standoff detection of concealed and buried chemicals by adding the remote IR and/or thermal spectroscopic and imaging detection systems.

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