Detection of concealed and buried chemicals by using multifrequency excitations
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Issue Date
2010Author
Gao, Yaohui
Chen, Meng-Ku
Yang, Chia-En
Chang, Yun-Ching
Yao, Jimmy
Cheng, Jiping
Yin, Stuart Shizhuo
Hui, Rongqing
Ruffin, Paul
Brantley, Christina
Edwards, Eugene
Luo, Claire
Publisher
American Institute of Physics
Type
Article
Article Version
Scholarly/refereed, publisher version
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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 dcelectric 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 dcelectric 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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This is the published version. Copyright © 2010 American Institute of Physics
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Citation
Gao, Yaohui, Meng-Ku Chen, Chia-En Yang, Yun-Ching Chang, Jim Yao, Jiping Cheng, Stuart Yin, Rongqing Hui, Paul Ruffin, Christina Brantley, Eugene Edwards, and Claire Luo. "Detection of Concealed and Buried Chemicals by Using Multifrequency Excitations." J. Appl. Phys. Journal of Applied Physics 108.4 (2010): 043106. http://dx.doi.org/10.1063/1.3474651
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