Accession Number : ADA525012


Title :   Guided Terahertz Waves for Characterizing Explosives


Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC ELECTRONICS SCIENCE AND TECHNOLOGY DIV


Personal Author(s) : Melinger, J S ; Grischkowsky, D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a525012.pdf


Report Date : Jan 2009


Pagination or Media Count : 3


Abstract : One of the most promising and discussed applications of terahertz (THz) spectroscopy is the detection of explosives materials through identification of their vibrational fingerprint spectra. While much progress has been made toward the measurement of THz vibrational fingerprints of explosives, fundamental issues remain to be addressed for THz sensing of explosives to reach its full potential. One issue is that line broadening mechanisms obscure the vibrational spectra of explosives, such that individual vibrational absorption lines merge into broad absorption features. Such line broadening makes identification of explosives more difficult and also impedes a full understanding of the origin of the vibrational fingerprint lines. A detailed scientific understanding of THz vibrational fingerprint spectra is necessary for their rational use in a database of threat materials. A second issue is that THz vibrational transitions tend to be about 100 times weaker relative to mid-infrared vibrational transitions. This emphasizes a need to develop methods to boost the sensitivity of THz measurements for explosives detection.


Descriptors :   *VIBRATIONAL SPECTRA , *EXPLOSIVES DETECTION , *ABSORPTION SPECTRA , FINGERPRINTS , DATA BASES , WAVES


Subject Categories : Miscellaneous Detection and Detectors
      Ammunition and Explosives


Distribution Statement : APPROVED FOR PUBLIC RELEASE