Egg Harbor City, NJ, United States
Egg Harbor City, NJ, United States

Time filter

Source Type

Barber J.,Battelle | Weatherall J.C.,SRA International, Inc. | Smith B.T.,Transportation Security Laboratory | Duffy S.,Global Systems Technology Inc. | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

Devices using electromagnetic (EM) waves in the GHz range are evolving rapidly. The advancement of this technology for security applications, such as explosives detection and personnel screening, requires an understanding of the optical properties of various materials. Using terahertz time-domain spectroscopy and free space millimeter-wave measurements, the dielectric constant of explosives have been measured. Methods used to standardize the experimental measurement and characterize the EM/material interaction are described. These results have enabled the development of mixtures of benign substances as simulants for testing. A comparison of the anticipated signal returns are presented for the range 100 - 500 GHz for a limited set of explosives and simulants. © 2010 Copyright SPIE - The International Society for Optical Engineering.


Brauer C.S.,Transportation Security Laboratory | Barber J.,Battelle | Weatherall J.C.,SRA International, Inc. | Smith B.T.,Transportation Security Laboratory | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

The Raman spectra of triacetone triperoxide (TATP) and its fully deuterated isotopologue (d18-TATP) have been measured. Density functional theory calculations were performed using the EDF2/6-311++G** and B3LYP/6-311++G** methods/basis set to predict the Raman spectra of both the parent and deuterated isotopologues. The predicted isotopic shifts were used to identify frequency shifts in the experimental results and tentative assignments have been made for 10 fundamental vibrational modes of d 18-TATP. © 2011 SPIE.

Loading Global Systems Technology Inc. collaborators
Loading Global Systems Technology Inc. collaborators