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dc.contributor.advisorHernández-Rivera, Samuel P.
dc.contributor.authorCastro-Suarez, John R.
dc.description.abstractAn Open-Path Standoff Detection System was designed using a telescope coupled to a EM27 Fourier Transform infrared spectrometer equipped with a mercury cadmium telluride (MCT) cryocooled detector. Samples of highly energetic substances deposited on metal surfaces were detected using this method. Standoff detection experiments on metal surfaces were carried out in passive and active modes. 2,4,6-trinitrotoluene (TNT) was used as the main target for the studies and aluminum plates as the supporting material. The samples analyzed were placed at different distances (4 to 30 m) for both active and passive mode experiments. All experiments were carried out at room temperature. Several surface temperatures were tested in passive mode standoff detection system. Surface concentrations (50 to 400 ug/cm2 ) were used for both methods of standoff IR detection. Data were analyzed using chemometrics routines. Spectra were submitted to statistical treatments based on partial least squares (PLS) algorithms. Both active and passive mode showed to be useful to record TNT vibrational signatures at distances up to 20 m and 30 m, respectively.
dc.description.abstractUn sistemas de detección a distancia fue diseñado usando un telescopio acoplado a un espectrómetro de Transformada de Fourier EM27 equipado con un detector de teluro de mercurio y cadmio (MCT) enfriado criogénicamente. Muestras de sustancias energéticas depositadas sobre superficies metálicas fueron detectadas usando este método. Los experimentos de detección de explosivos a distancia sobre superficies metálicas fueron llevados a cabo en modo activo y modo pasivo. 2,4,6-trinitrotolueno (TNT) fue usado como analito de interés y una placa de aluminio como sustrato. Las muestras analizadas se colocaron a diferentes distancias del detector de infrarrojo (4 a 30 m) para ambos experimentos, en modo activo y modo pasivo. Todos los experimentos fueron llevados a cabo a temperatura ambiente. Varias temperaturas superficiales en las placas de aluminio fueron aplicadas en los sistemas de detección a distancia en modo pasivo, creando un delta de temperatura entre la lámina metálica y el ambiente. Diferentes concentraciones superficiales de material energético (desde 50 a 400 ug/cm2 ) fueron usadas para ambos métodos. Diferentes tratamientos estadístico fueron hechos a los espectros registrados. Los espectros obtenidos desde las muestras de explosivos sobre la superficie metálica fueron analizados usando cuadrados mínimos parciales (PLS). Ambos experimentos en modo activo y pasivo mostraron ser útiles para obtener señales vibracionales de TNT a distancias máximas de 20 y 30 metros respectivamente.
dc.description.sponsorshipThe U.S. Department of Defense, The Defense Threat Reduction Agency (DTRA), U.S. Department of Homeland Securityen_US
dc.subjectInfrared spectroscopyen_US
dc.subjectVibrational spectral analysisen_US
dc.subject.lcshInfrared spectroscopyen_US
dc.subject.lcshVibrational spectraen_US
dc.titleRemote infrared spectroscopy detection of highly energetic materialsen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2015 John R. Castro Suarezen_US
dc.contributor.committeeBriano-Peralta, Julio G.
dc.contributor.committeeMina-Camilde, Nairmen
dc.contributor.committeeVega-Olivencia, Carmen A.
dc.contributor.representativeTorres-Lugo, Madeline Chemistryen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Chemistryen_US

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