Show simple item record

dc.contributor.advisorHernández-Rivera, Samuel P.
dc.contributor.authorOrtega-Zúñiga, Carlos A.
dc.date.accessioned2018-04-09T13:11:39Z
dc.date.available2018-04-09T13:11:39Z
dc.date.issued2013-12
dc.identifier.urihttps://hdl.handle.net/20.500.11801/327
dc.description.abstractA standoff detection scheme for a highly energetic material (HEM) and other threat chemicals deposited on substrates as contamination residues using Fourier transform infrared spectroscopy (FTIR) is described. The HEM used as target analyte in this work was the well-known nitroaliphatic nitrate ester pentaerythritol tetranitrate (PETN). The experimental protocol consisted of evaluating active mode infrared (IR) spectroscopy standoff sensing at a distance of 1 m with variations in three parameters of the detection system. The first variable considered was the angular dependence of the incidence IR beam with respect to the target containing analyte contamination residues. Angles studied were: 0° (normal incidence) to 60° with detector placed at the same angle as the incidence angle (symmetric configuration). The second variable was the substrate type on which the target material was deposited. Three substrates were used: polished aluminum (Al), roughened Al, and anodized Al. The third variable studied was the analyte surface concentration on the substrates: from 10 to 200 μg/cm2 . Calibration models were based on the use of a multivariate analysis routine: partial least squares regression analysis. This algorithm was used to evaluate the effect of the angular dependence, substrate type and surface concentration on the detection limits of PETN deposited on the Al substrates.
dc.description.abstractUn esquema de detección a distancia para materiales altamente energéticos (HEMs, highly energetic materials) usando espectroscopia infrarroja de transformada de Fourier (FT-IR, Fourier transform infrared spectroscopy) se describe. El HEM usado en este trabajo fue el bien conocido éster de nitrato alifático pentaeritritol tetranitrato (PETN). El protocolo experimental consistió en la evaluación de un sistema de detección a distancia utilizando espectroscopia infrarroja en modo activo a 1 m de distancia con la variación de tres parámetros del sistema de detección. La primera variable considerada fue la dependencia angular del haz de IR incidente con respecto al blanco conteniendo residuos de contaminación del analito. Ángulos estudiados fueron: 0° (incidencia normal) hasta 60° con el detector colocado al mismo ángulo que el haz incidente (configuración simétrica). La segunda variable fue el tipo de substrato sobre el cual se depositó el material del blanco. Tres substratos se utilizaron: aluminio (Al) pulido, Al rugoso y Al anodizado. La tercera variable estudiada fue la concentración superficial del analito depositada sobre los substratos: de 10 hasta 200 μg/cm2 . Los modelos de calibración fueron basados en el uso de rutinas de análisis multivariado: regresión de cuadrados mínimos parciales. Este algoritmo se utilizó para evaluar en efecto de la dependencia angular, el tipo de sustrato y la concentración superficial en los límites de detección PETN depositado sobre los substratos de Al.
dc.description.sponsorshipU.S. Department of Defense and U.S. Department of Homeland Securityen_US
dc.language.isoenen_US
dc.subjectHighly energetic materialen_US
dc.subjectPentaerythritol tetranitrateen_US
dc.subjectSpectroscopy standoff sensingen_US
dc.subject.lcshExplosives--Detectionen_US
dc.subject.lcshPentaerythritol tetranitrateen_US
dc.subject.lcshAngle of attack (Aerodynamics)en_US
dc.subject.lcshChemometricsen_US
dc.titleDependence of active mode remote Ft-Ir sensing on angle of incidence, substrate type and analyte surface concentrationen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2013 Carlos Alberto Ortega-Zúñigaen_US
dc.contributor.committeeMina-Camilde, Nairmen
dc.contributor.committeeSantana, Alberto
dc.contributor.committeeMeléndez, Enrique
dc.contributor.representativeRomero, Juan
thesis.degree.levelM.S.en_US
thesis.degree.disciplineChemistryen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Chemistryen_US
dc.description.graduationSemesterFallen_US
dc.description.graduationYear2013en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

  • Theses & Dissertations
    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a graduate degree at UPR-Mayagüez.

Show simple item record

All rights reserved
Except where otherwise noted, this item's license is described as All Rights Reserved