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dc.contributor.advisorHernández-Rivera, Samuel P.
dc.contributor.authorOrtiz-Rivera, William
dc.description.abstractRemote Raman detection has become a powerful analytical technique for detection of hazardous compounds in situ and without sample preparation at distances away from the observation site. This study describes the design, assembly, testing and validation of Remote Raman Spectroscopy (RRS) systems intended for stand-off detection of hazardous chemicals such as explosives: TNT, PETN, RDX and TATP; chemical warfare agents simulants: dimethylmethylphosphonate, 2-chloroethyl ethyl sulfide and 2-(butylamino)-ethanethiol; and Toxic Industrial Compounds: benzene, chlorobenzene, toluene, carbon tetrachloride, cyclohexane and carbon disulfide. The prototype systems consisted of a spectrometer equipped with a CCD detector (for CW measurements) and an I-CCD camera with time-gated electronics (for pulsed laser measurements), a reflecting telescope, fiber optic assemblies, single-line continuous wave (CW) laser sources (514.5, 488.0, 351.1 and 363.8 nm) and a frequency-doubled single frequency Nd:YAG 532 nm pulse laser (5 ns pulses at 10 Hz repetition rate). The telescope was coupled to the spectrograph using an optical fiber and notch filters were used to reject laser radiation and Rayleigh scattering. Two quartz convex lenses were used to collimate the light from the telescope from which the telescope-focusing eyepiece was removed, and direct it to the fiber optic assembly. The stand-off detection systems were tested employing the compounds mentioned at different remote distances (2 to 141 m) using several sampling approaches. Quantification and classification of explosives (TNT and PETN) hidden in non-explosives matrices (4-NBA and APAP) with similar chemical structures were achieved in powder mixtures by using chemometrics techniques.
dc.description.abstractLa detección remota empleando la espectroscopia Raman, se ha convertido en una poderosa técnica analítica útil en la detección remota de compuestos peligrosos in situ y sin preparación de muestras. En esta investigación se describe el diseño, ensamblaje, y prueba de un sistema de detección remota empleando espectroscopia Raman destinado para la detección a distancia de sustancias químicas peligrosas como explosivos:(TNT, PETN, RDX y TATP); simulantes de agentes químicos empleados en conflictos belicos: (dimetilmetilfosfonato, sulfuro de 2-cloroetilo, 2-(butiloamino)-etanotiol y compuestos industrial tóxicos: benceno, clorobenceno, tolueno, tetracloruro de carbono, ciclohexano y disulfuro de carbono. El sistema de detección consistió de un espectrómetro equipado con un detector CCD ( para mediciones empleando laser de onda continua) y una cámara I-CCD (para mediciones con laser pulsado), un telescopio reflector, fibras ópticas, laser de onda continua (514.5, 488.0 nm) y la segunda armónica a 532 nm de un laser pulsado Nd:YAG (con un pulsos de 5 ns y una rapidez de repetición de 10 Hz). El telescopio se acopló a el espectrógrafo por medio de una fibra óptica, un filtro “notch”. El ocular del telescopio fue modificado por dos lentes biconvexos de cuarzo para hacer converger la señal Raman recogida por el telescopio y transmitida hacia la fibra. Nuestro sistema de detección remota se validó con los compuestos mencionados a diferentes distancias (2 a 141m) usando diferentes técnicas de muestreo. Se llevaron a cabo estudios de cuantificación y discriminación de explosivos (TNT y PETN) escondidos deliberadam ente en matrices con estructura química parecida (4-NBA y APAP) empleando técnicas de quimiometría.
dc.description.sponsorshipThe U.S. Department of Defense, University Research Initiative- Multidisciplinary University Research Initiative (URI)-MURI Program and the U.S. Department of Homeland Securityen_US
dc.subjectRemote Raman spectroscopyen_US
dc.subjectDetection of hazardous compoundsen_US
dc.subject.lcshRaman spectroscopyen_US
dc.subject.lcshRaman effect, Resonanceen_US
dc.subject.lcshSpectrum analysisen_US
dc.titleDesign and development of remote Raman spectroscopy system for detection of hazardous compoundsen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2012 William Ortiz-Riveraen_US
dc.contributor.committeeVega, Carmen A.
dc.contributor.committeeRivera, Nilka
dc.contributor.committeeBriano-Peralta, Julio G.
dc.contributor.representativeBellido, Carmen Chemistryen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Chemistryen_US

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