Dr. Steven C. Hill Profile

Dr. Steven C. Hill

at DEVCOM Army Research Lab

SPIE Involvement:

Author

Publications (15)

Proceedings Article | 30 May 2022 Presentation

Ambient observations of Raman spectra from aerosol particles from Maryland and New Mexico

David Doughty, Steven Hill

Proceedings Volume PC12116, PC121160C (2022) https://doi.org/10.1117/12.2618940

KEYWORDS: Atmospheric particles, Raman spectroscopy, Aerosols, Remote sensing, Luminescence, Carbon, Spectroscopy, Pollution, Minerals, Imaging spectroscopy

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Proceedings Article | 3 June 2011 Paper

Fluorescence spectra of bioaerosols exposed to ozone in a laboratory reaction chamber to simulate atmospheric processing

Yong-Le Pan, Steven Hill, Ronald Pinnick, Joshua Santarpia, Neal Baker, Benjamin Alvarez, Shanna Ratnesar-Shumate, Brian Cottrell, Laura McKee

Proceedings Volume 8018, 801804 (2011) https://doi.org/10.1117/12.883417

KEYWORDS: Aerosols, Luminescence, Atmospheric particles, Ozone, Particles, Atmospheric monitoring, Humidity, Atmospheric physics, Ultraviolet radiation, Proteins

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Proceedings Article | 3 October 2008 Paper

Dual-wavelength-excitation single-particle fluorescence spectrometer/particle sorter for real-time measurement of organic carbon and biological aerosols

Yong-Le Pan, Ron Pinnick, Steven Hill, Hermes Huang, Richard Chang

Proceedings Volume 7116, 71160J (2008) https://doi.org/10.1117/12.801774

KEYWORDS: Luminescence, Atmospheric particles, Aerosols, Particles, Laser scattering, Spectroscopy, Scattering, Fluorescence spectroscopy, Sensors, Optical filters

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We report the development of a Single-Particle Fluorescence Spectrometer (SPFS) system capable of measuring two UV-laser excited fluorescence spectra from a single particle on-the-fly. The two dispersed fluorescence spectra are obtained from excitation by two lasers at different wavelengths (263 nm and 351 nm). The SPFS samples single particles with sizes primarily in the 1-10 &mgr;m range. The fluorescence spectra are recorded from 280 nm to 600 nm (in 20 channels) for 263 nm excitation and from 370 nm to 700 nm (in 22 channels) for 351 nm excitation. The elastic scattering (channel 4 and 9) is also recorded for sizing each particle. A time stamp for single particles is marked with a variable time interval resolution from 10 ms to 10 minutes. The SPFS employs a virtual-impactor concentrator to concentrate respirable-sized particles with a resulting (size-dependent) effective flow rate of around 100 liters/min. The SPFS can measure single-particle spectra at a maximum rate of 90,000/sec, although the highest rates we have experienced for the ambient are only several hundred/sec. When the SPFS is combined with an aerodynamic deflector (puffer) to sort particles according to their fluorescence spectral characteristics, the SPFS/puffer system can selectively deflect and collect an enriched sample of targeted particles (at rates limited by the puffer) of 1200 particles/sec, for further examination. In laboratory tests, aerosol particles with similar UV-LIF spectra (e.g. B. subtilis and E.coli) are puffed into the reservoir of a micro-fluidic cell, where fluorescent-labeled antibodies bind to them and were classified by their labeled fluorescence. Measurements of the background ambient aerosol with the SPFS system made at sites with different regional climate (Connecticut, Maryland, and New Mexico) were clustered (unstructured hierarchical analysis) into 8-10 groups, with over 90% of all the fluorescent particles contained within these clusters (threshold dot product=0.9). However, the percentage of aerosols in each profile differed by sampling location. The unique features and performance of the SPFS/puffer system compared to other fluorescence-based bio-aerosol sensors will be discussed, with emphasis on reduction of false alarm rates.

Proceedings Article | 8 March 2004 Paper

Two-dimensional angular optical scattering patterns of aerosol particles in the mid-infrared: measurements designed to obtain particle absorption

Kevin Aptowicz, Yong-Le Pan, Ronald Pinnick, Steven Hill, Richard Tober, Richard Chang, Burt Bronk

Proceedings Volume 5269, (2004) https://doi.org/10.1117/12.518873

KEYWORDS: Atmospheric particles, Aerosols, Absorption, Scattering, Light scattering, Mid-IR, Refractive index, Spherical lenses, Laser scattering, Particles

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Proceedings Article | 4 November 2003 Paper

Ultrashort laser applications in lidar and atmospheric sciences

Jerome Kasparian, Riad Bourayou, Veronique Boutou, Catherine Favre, Guillaume Mejean, Didier Mondelain, Andre Mysyrowicz, Miguel Rodriguez, Estelle Salmon, Roland Sauerbrey, Holger Wille, Jean-Pierre Wolf, Ludger Woeste, Jin Yu, L. Klingbeil, K. Rethmeier, W. Kalkner, A. Hartzes, H. Lehman, J. Eisloeffel, Bringfried Stecklum, J. Winkler, Uwe Laux, S. Hoenger, Yong-Le Pan, Richard Chang, Steve Hill

Proceedings Volume 5226, (2003) https://doi.org/10.1117/12.519494

KEYWORDS: LIDAR, Atmospheric particles, Aerosols, Atmospheric propagation, Atmospheric laser remote sensing, Femtosecond phenomena, Dispersion, Remote sensing, Laser applications, Atmospheric sciences

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Proceedings Article | 30 November 1999 Paper

Real-time detection and characterization of individual flowing airborne biological particles: fluorescence spectra and elastic scattering measurements

Yongle Pan, Stephen Holler, Richard Chang, Steven Hill, Ronald Pinnick, Stanley Niles, Jerold Bottiger, Burt Bronk

Proceedings Volume 3855, (1999) https://doi.org/10.1117/12.371270

KEYWORDS: Luminescence, Atmospheric particles, Aerosols, Particles, Scattering, Laser scattering, Semiconductor lasers, Bacteria, Mirrors, Scatter measurement

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Proceedings Article | 18 January 1999 Paper

Two-dimensional angular scattering measurements of single airborne microparticles

Stephen Holler, Yongle Pan, Jerold Bottiger, Steven Hill, David Hillis, Richard Chang

Proceedings Volume 3533, (1999) https://doi.org/10.1117/12.336844

KEYWORDS: Scattering, Particles, Optical spheres, Atmospheric particles, Light scattering, Laser scattering, Scatter measurement, Luminescence, Cameras, Bioalcohols

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Proceedings Article | 18 January 1999 Paper

Concentration, size, and excitation power effects on fluorescence from microdroplets and microparticles containing tryptophan and bacteria

Nicholas Fell, Ronald Pinnick, Steven Hill, Gorden Videen, Stanley Niles, Richard Chang, Stephen Holler, Yongle Pan, Jerold Bottiger, Burt Bronk

Proceedings Volume 3533, (1999) https://doi.org/10.1117/12.336843

KEYWORDS: Luminescence, Atmospheric particles, Ultraviolet radiation, Particles, Objectives, Reflectivity, Bacteria, Analytical research, Zoom lenses, Cameras

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Proceedings Article | 26 September 1997 Paper

Green function for fluorescence from spherical particles located on a substrate

Gorden Videen, Steven Hill, J. Pendleton

Proceedings Volume 3141, (1997) https://doi.org/10.1117/12.279241

KEYWORDS: Optical spheres, Spherical lenses, Scattering, Luminescence, Atmospheric particles, Interfaces, Particles, Raman spectroscopy, Silicon, Semiconducting wafers

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Proceedings Article | 30 May 1997 Paper

Aerosol fluorescence spectrum analyzer for individual airborne biological particles

Gang Chen, Ronald Pinnick, Steven Hill, Richard Chang, Paul Nachman, Gorden Videen

Proceedings Volume 3105, (1997) https://doi.org/10.1117/12.276175

KEYWORDS: Luminescence, Atmospheric particles, Particles, Aerosols, Laser scattering, Laser beam diagnostics, Scattering, Bacteria, Signal detection, Ultraviolet radiation

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Proceedings Article | 15 September 1993 Paper

Linear and nonlinear scattering by a dielectric sphere

Dipakbin Chowdhury, Md. Mohiuddin Mazumder, Steven Hill

Proceedings Volume 1968, (1993) https://doi.org/10.1117/12.154831

KEYWORDS: Absorption, Optical spheres, Refractive index, Scattering, Remote sensing, Atmospheric particles, Aerosols, Atmospheric propagation, Spherical lenses, Laser scattering

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Proceedings Article | 24 May 1993 Paper

Light scattering by radially inhomogeneous fuel droplets in a high-temperature environment

Michael Schneider, E. Dan Hirleman, Hasan Saleheen, Dipakbin Chowdhury, Steven Hill

Proceedings Volume 1862, (1993) https://doi.org/10.1117/12.145705

KEYWORDS: Scattering, Refractive index, Light scattering, Polarization, Optical spheres, Geometrical optics, Liquids, Diffusion, Palladium, Ray tracing

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Proceedings Article | 24 May 1993 Paper

Modeling nonlinear optical mixing processes in droplets

Steven Hill, Richard Chang

Proceedings Volume 1862, (1993) https://doi.org/10.1117/12.145708

KEYWORDS: Polarization, Optical spheres, Liquids, Second-harmonic generation, Sum-frequency generation, Raman spectroscopy, Interfaces, Dielectric polarization, Chemical species, Combustion

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