Dr. Leonardo C. Pacheco-Londoño Profile

Dr. Leonardo C. Pacheco-Londoño

Chemist at Univ de Puerto Rico Mayagüez

SPIE Involvement:

Author

Publications (30)

SPIE Journal Paper | 2 July 2020

Modulated-laser source induction system for remote detection of infrared emissions of high explosives using laser-induced thermal emission

Nataly Galán-Freyle, Leonardo Pacheco-Londoño, Amanda M. Figueroa Navedo, William Ortiz-Rivera, John Castro-Suarez, Samuel Hernández-Rivera

OE, Vol. 59, Issue 09, 092008, (July 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.9.092008

KEYWORDS: Gas lasers, Telescopes, Carbon monoxide, Spectroscopy, Infrared radiation, Infrared detectors, Thermography, Carbon dioxide lasers, Modulation

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Proceedings Article | 6 June 2013 Paper

Angular dependence of source-target-detector in active mode standoff infrared detection

Leonardo Pacheco-Londoño, John Castro-Suarez, Joaquín Aparicio-Bolaños, Samuel Hernández-Rivera

Proceedings Volume 8711, 871108 (2013) https://doi.org/10.1117/12.2016153

KEYWORDS: Quantum cascade lasers, Standoff detection, Infrared radiation, Modulation, FT-IR spectroscopy, Spectroscopy, Light, Sensors, Infrared spectroscopy, Infrared detectors

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Proceedings Article | 3 June 2013 Paper

Improved detection of highly energetic materials traces on surfaces by standoff laser-induced thermal emission incorporating neural networks

Amanda Figueroa-Navedo, Nataly Galán-Freyle, Leonardo Pacheco-Londoño, Samuel Hernández-Rivera

Proceedings Volume 8705, 87050D (2013) https://doi.org/10.1117/12.2030978

KEYWORDS: Principal component analysis, Neural networks, Data modeling, Pattern recognition, Chemometrics, Statistical modeling, Carbon dioxide lasers, Sensors, Explosives, Improvised explosive devices

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Proceedings Article | 23 May 2013 Paper

Dependence of detection limits on angular alignment, substrate type and surface concentration in active mode standoff IR

Carlos Ortega-Zuñiga, Nataly Galán-Freyle, John Castro-Suarez, Joaquín Aparicio-Bolaño, Leonardo Pacheco-Londoño, Samuel Hernández-Rivera

Proceedings Volume 8734, 87340R (2013) https://doi.org/10.1117/12.2016196

KEYWORDS: Aluminum, Calibration, Polishing, FT-IR spectroscopy, Surface finishing, Chemometrics, Light scattering, Statistical modeling, Standoff detection, Solids

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Proceedings Article | 22 May 2013 Paper

Standoff laser-induced thermal emission of explosives

Nataly Galán-Freyle, Leonardo Pacheco-Londoño, Amanda Figueroa-Navedo, Samuel Hernandez-Rivera

Proceedings Volume 8705, 870508 (2013) https://doi.org/10.1117/12.2016067

KEYWORDS: Carbon dioxide lasers, Explosives, Spectroscopy, FT-IR spectroscopy, Calibration, Standoff detection, Infrared spectroscopy, Aluminum, Infrared radiation, Statistical analysis

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Proceedings Article | 21 May 2011 Paper

Open path FTIR detection of threat chemicals in air and on surfaces

John Castro-Suarez, Leonardo Pacheco-Londoño, William Ortiz-Rivera, Miguel Vélez-Reyes, Max Diem, Samuel Hernandez-Rivera

Proceedings Volume 8012, 801209 (2011) https://doi.org/10.1117/12.884436

KEYWORDS: Spectroscopy, Aluminum, Infrared spectroscopy, Solids, FT-IR spectroscopy, Calibration, Statistical analysis, Explosives, Reflectivity, Infrared telescopes

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Proceedings Article | 13 May 2011 Paper

Nanosensors: from near field to far field applications

Gloria Herrera, Hilsamar Félix, Pedro Fierro, Marcia Balaguera, Leonardo Pacheco, Julio Briano, Francisco Marquez, Carlos Ríos, Samuel Hernández-Rivera

Proceedings Volume 8031, 80312X (2011) https://doi.org/10.1117/12.884420

KEYWORDS: Surface enhanced Raman spectroscopy, Silver, Raman spectroscopy, Metals, Zinc oxide, Gold, Oxides, Ultraviolet radiation, Nanoparticles, Titanium dioxide

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Proceedings Article | 13 May 2011 Paper

Vibrational spectroscopy standoff detection of threat chemicals

William Ortiz-Rivera, Leonardo Pacheco-Londoño, John Castro-Suarez, Hilsamar Felix-Rivera, Samuel Hernandez-Rivera

Proceedings Volume 8031, 803129 (2011) https://doi.org/10.1117/12.884433

KEYWORDS: Raman spectroscopy, Telescopes, Explosives, Spectroscopy, Standoff detection, Aluminum, Biological detection systems, Sensors, Tungsten

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Proceedings Article | 14 May 2007 Paper

Characterization of layers of Tetryl, TNB, and HMX on metal surfaces using fiber optics coupled grazing angle-FTIR

Leonardo Pacheco-Londoño, Angel Santiago, Jackson Pujols, Oliva Primera-Pedrozo, Alessandra Mattei, William Ortiz, Orlando Ruiz, Michael Ramirez, Samuel Hernandez-Rivera

Proceedings Volume 6542, 65423K (2007) https://doi.org/10.1117/12.720976

KEYWORDS: Statistical analysis, Spectroscopy, Explosives, Imaging spectroscopy, FT-IR spectroscopy, Infrared spectroscopy, Metals, Fiber optics, Infrared radiation, Mid-IR

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Proceedings Article | 14 May 2007 Paper

Detection of 2,4,6-trinitrotoluene on non-traditional surfaces using fiber optic coupled grazing angle probe: FTIR

Oliva Primera-Pedrozo, Nelmarie Rodríguez, Leonardo Pacheco-Londoño, Samuel Hernández-Rivera

Proceedings Volume 6542, 65423J (2007) https://doi.org/10.1117/12.720405

KEYWORDS: Explosives, Explosives detection, Fiber optics, Spectroscopy, FT-IR spectroscopy, Statistical analysis, Sensors, Infrared spectroscopy, Analytical research, Mid-IR

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Proceedings Article | 4 May 2007 Paper

Detection of hazardous liquids concealed in glass, plastic, and aluminum containers

Michael Ramirez, William Ortiz, Orlando Ruiz, Leonardo Pacheco-Londoño, Samuel Hernández-Rivera

Proceedings Volume 6538, 653827 (2007) https://doi.org/10.1117/12.720570

KEYWORDS: Liquids, Raman spectroscopy, Glasses, Hydrogen, Aluminum, Explosives, Bioalcohols, Toxic industrial chemicals, Fiber optics

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Proceedings Article | 27 April 2007 Paper

Spectroscopic characterization of biological agents using FTIR, normal Raman and surface-enhanced Raman spectroscopies

Tatiana Luna-Pineda, Kristina Soto-Feliciano, Edwin De La Cruz-Montoya, Leonardo Pacheco Londoño, Carlos Ríos-Velázquez, Samuel Hernández-Rivera

Proceedings Volume 6554, 65540K (2007) https://doi.org/10.1117/12.720338

KEYWORDS: Raman spectroscopy, Surface enhanced Raman spectroscopy, Spectroscopy, Analytical research, FT-IR spectroscopy, Bacteria, Silver, Principal component analysis, Infrared spectroscopy, Chemical analysis

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Proceedings Article | 26 April 2007 Paper

Detection of simulants and degradation products of chemical warfare agents by vibrational spectroscopy

Orlando Ruiz-Pesante, Leonardo Pacheco-Londoño, Oliva Primera-Pedrozo, William Ortiz, Yadira Soto-Feliciano, Deborah Nieves, Michael Ramirez, Samuel Hernández-Rivera

Proceedings Volume 6554, 65540B (2007) https://doi.org/10.1117/12.720344

KEYWORDS: Raman spectroscopy, Spectroscopy, Liquids, Chemical analysis, FT-IR spectroscopy, Deep ultraviolet, Telescopes, Infrared radiation, Imaging spectroscopy

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Proceedings Article | 18 May 2006 Paper

UV Raman detection of 2,4-DNT in contact with sand particles

Alejandro Blanco, Leonardo Pacheco-Londoño, Alvaro Peña-Quevedo, Samuel Hernández-Rivera

Proceedings Volume 6217, 621737 (2006) https://doi.org/10.1117/12.666281

KEYWORDS: Raman spectroscopy, Ultraviolet radiation, Explosives, Near infrared, Luminescence, Visible radiation, Crystals, Spectroscopy, Microscopes, Spectroscopes

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Proceedings Article | 18 May 2006 Paper

Standoff infrared detection of explosives at laboratory scale

Leonardo Pacheco-Londoño, Oliva Primera-Pedrozo, Michael Ramírez, Orlando Ruiz, Samuel Hernández-Rivera

Proceedings Volume 6206, 620634 (2006) https://doi.org/10.1117/12.666535

KEYWORDS: Explosives, Sensors, Reflectivity, Infrared radiation, Standoff detection, Infrared detection, FT-IR spectroscopy, Distance measurement, Infrared detectors, Infrared spectroscopy

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Proceedings Article | 11 May 2006 Paper

Novel method for the preparation of explosive nanoparticles

Marcos Barreto-Cabán, Leonardo Pacheco-Londoño, Michael Ramírez, Samuel Hernández-Rivera

Proceedings Volume 6201, 620129 (2006) https://doi.org/10.1117/12.666147

KEYWORDS: Particles, Explosives, Silicon, Raman spectroscopy, Nanoparticles, Scanning electron microscopy, Glasses, Solids, Photomicroscopy, Nitrogen

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Proceedings Article | 10 May 2006 Paper

Detection of explosive mixtures on surfaces using grazing angle probe - FTIR: model for classification

Oliva Primera-Pedrozo, Yadira Soto-Feliciano, Leonardo Pacheco-Londoño, Luis De La Torre-Quintana, Samuel Hernandez-Rivera

Proceedings Volume 6201, 62012A (2006) https://doi.org/10.1117/12.665944

KEYWORDS: Explosives, Statistical analysis, Principal component analysis, FT-IR spectroscopy, Explosives detection, Sensors, Infrared spectroscopy, Data modeling, Analytical research, Mid-IR

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Proceedings Article | 10 May 2006 Paper

Characterization of peroxide-based explosives by thermal analysis

Michael Ramírez, Leonardo Pacheco-Londoño, Álvaro Peña, Samuel Hernández-Rivera

Proceedings Volume 6201, 62012B (2006) https://doi.org/10.1117/12.666227

KEYWORDS: Explosives, Standoff detection, Thermal analysis, Temperature metrology, Explosives detection, Calorimetry, Protactinium, Nitrogen, Calibration, Imaging spectroscopy

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Proceedings Article | 10 May 2006 Paper

Temperature dependence of detection limits of TNT on metallic surfaces using fiber optic coupled FTIR

Yadira Soto-Feliciano, Oliva Primera-Pedrozo, Leonardo Pacheco-Londoño, Samuel Hernandez-Rivera

Proceedings Volume 6201, 62012H (2006) https://doi.org/10.1117/12.665897

KEYWORDS: FT-IR spectroscopy, Spectroscopy, Explosives, Mid-IR, Fiber optics, Chemical analysis, Sensors, Optical fiber cables, Temperature metrology, Chemometrics

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Proceedings Article | 20 May 2005 Paper

Characterization of thermal inkjet technology TNT deposits by fiber optic-grazing angle probe FTIR spectroscopy

Oliva Primera-Pedrozo, Leonardo Pacheco-Londono, Orlando Ruiz, Michael Ramirez, Yadira Soto-Feliciano, Luis De La Torre-Quintana, Samuel Hernandez-Rivera

Proceedings Volume 5778, (2005) https://doi.org/10.1117/12.602451

KEYWORDS: FT-IR spectroscopy, Spectroscopy, Sensors, Explosives, Inkjet technology, Fiber optics, Head, Mid-IR, Calibration, Infrared radiation

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Proceedings Article | 20 May 2005 Paper

Surface enhanced Raman scattering of nitroexplosives on nontraditional substrates

Edwin De La Cruz-Montoya, Alejandro Blanco, Marcia Balaguera-Gelves, Leonardo Pacheco-Londono, Samuel Hernandez-Rivera

Proceedings Volume 5778, (2005) https://doi.org/10.1117/12.604202

KEYWORDS: Raman spectroscopy, Surface enhanced Raman spectroscopy, Raman scattering, Oxides, Crystals, Metals, Explosives, Gold, Molecules, Sensors

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Proceedings Article | 20 May 2005 Paper

Review of the various analytical techniques and algorithms for detection and quantification of TATP

Leonardo Pacheco-Londono, Oliva Primera, Michael Ramirez, Orlando Ruiz, Samuel Hernandez-Rivera

Proceedings Volume 5778, (2005) https://doi.org/10.1117/12.603073

KEYWORDS: Sensors, Solids, FT-IR spectroscopy, Infrared radiation, Gold, Infrared imaging, Spectroscopy, Statistical analysis, Explosives, Chemical analysis

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Proceedings Article | 20 May 2005 Paper

Characterization and differentiation of high energy cyclic organic peroxides by GC/FT-IR, GC-MS, FT-IR, and Raman microscopy

Alvaro Pena, Leonardo Pacheco-Londono, Javier Figueroa, Luis Rivera-Montalvo, Felix Roman-Velazquez, Samuel Hernandez-Rivera

Proceedings Volume 5778, (2005) https://doi.org/10.1117/12.604194

KEYWORDS: Raman spectroscopy, FT-IR spectroscopy, Carbon, Molecules, Spectroscopy, Microscopy, Crystals, Chemical species, Sensors, Hydrogen

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Proceedings Article | 28 March 2005 Paper

Determination of TATP, DNT, and TNT in air by FTIR and PLS-discriminant analysis

Leonardo Pacheco-Londono, Oliva Primera-Pedrozo, Luis de la Torre, Samuel Hernandez-Rivera

Proceedings Volume 5816, (2005) https://doi.org/10.1117/12.602449

KEYWORDS: Explosives, Statistical analysis, FT-IR spectroscopy, Near infrared, Chemical analysis, Sensors, Pattern recognition, Infrared spectroscopy, Absorbance, Infrared detectors

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Proceedings Article | 29 December 2004 Paper

Raman microspectroscopy crystallization studies of 2,4,6-TNT in different solvents

Cesar Manrique-Bastidas, Oliva Primera-Pedrozo, Leonardo Pacheco-Londono, Samuel Hernandez-Rivera

Proceedings Volume 5617, (2004) https://doi.org/10.1117/12.578607

KEYWORDS: Crystals, Raman spectroscopy, Photomicroscopy, Spectroscopy, Explosives, Imaging spectroscopy, Crystallography, Glasses, Magnesium, Gold

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Proceedings Article | 29 December 2004 Paper

Experimental and theoretical model of reactivity and vibrational detection modes of triacetone triperoxide (TATP) and homologues

Leonardo Pacheco-Londono, Oliva Primera-Pedrozo, Samuel Hernandez-Rivera

Proceedings Volume 5617, (2004) https://doi.org/10.1117/12.578603

KEYWORDS: Raman spectroscopy, Molecules, Infrared spectroscopy, Explosives, FT-IR spectroscopy, Chemical species, Absorbance, Spectroscopy, Electrons, Polarizability

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Proceedings Article | 21 September 2004 Paper

Spectroscopic characterization of nitroaromatic landmine signature explosives

Samuel Hernandez-Rivera, Cesar Manrique-Bastidas, Alejandro Blanco, Oliva Primera, Leonardo Pacheco, Jairo Castillo-Chara, Miguel Castro, Nairmen Mina

Proceedings Volume 5415, (2004) https://doi.org/10.1117/12.542895

KEYWORDS: Raman spectroscopy, Explosives, Land mines, Crystals, Spectroscopy, FT-IR spectroscopy, Infrared signatures, Sensors, Statistical analysis, Microscopy

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Proceedings Article | 15 September 2004 Paper

Molecular parameters and reactivity responsible for properties of nitro explosives

Leonardo Pacheco-Londono, Luis De la Torre-Quintana, Oliva Primera-Pedrozo, Gloria Herrera, Luz Ballesteros, Samuel Hernandez-Rivera

Proceedings Volume 5403, (2004) https://doi.org/10.1117/12.542839

KEYWORDS: Explosives, Molecules, Chemical species, Nitrogen, Statistical analysis, Molecular interactions, Statistical modeling, Error analysis, Homeland security, Molecular electronics

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Proceedings Article | 15 September 2004 Paper

Use of fiber optic coupled FT-IR in detection of explosives on surfaces

Oliva Primera-Pedrozo, Leonardo Pacheco-Londono, Luis De la Torre-Quintana, Samuel Hernandez-Rivera, R. Thomas Chamberlain, Richard Lareau

Proceedings Volume 5403, (2004) https://doi.org/10.1117/12.542812

KEYWORDS: FT-IR spectroscopy, Explosives, Fiber optics, Explosives detection, Homeland security, Spectroscopy, Calibration, Chemometrics, Metals, Mid-IR

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Proceedings Article | 15 September 2004 Paper

An experimental and theoretical study of the synthesis and vibrational spectroscopy of triacetone triperoxide (TATP)

Leonardo Pacheco-Londono, Alvaro Pena, Oliva Primera-Pedrozo, Samuel Hernandez-Rivera, Nairmen Mina, Rafael Garcia, R. Thomas Chamberlain, Richard Lareau

Proceedings Volume 5403, (2004) https://doi.org/10.1117/12.542851

KEYWORDS: Raman spectroscopy, Spectroscopy, Polarization, Explosives, Polymerization, Carbon monoxide, FT-IR spectroscopy, Molecules, Imaging spectroscopy, Solids

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Showing 5 of 30 publications

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