Mr. Patrick F. Henning Profile

Patrick F. Henning

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Publications (4)

Proceedings Article | 17 May 2006 Paper

Antenna-coupled microbolometers for multispectral infrared imaging

Aniruddha Weling, Patrick Henning, Dean Neikirk, Sangwook Han

Proceedings Volume 6206, 62061F (2006) https://doi.org/10.1117/12.665791

KEYWORDS: Sensors, Microbolometers, Infrared imaging, Absorption, Infrared sensors, Staring arrays, Mirrors, Long wavelength infrared, Thermography, Infrared detectors

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Proceedings Article | 8 March 2004 Paper

Waveguide infrared spectrometer platform for point and standoff chemical sensing

Suneet Chadha, Pat Henning, Frank Landers, Ani Weling

Proceedings Volume 5269, (2004) https://doi.org/10.1117/12.519426

KEYWORDS: Spectroscopy, Infrared spectroscopy, Waveguides, Biological and chemical sensing, Infrared sensors, Infrared radiation, FT-IR spectroscopy, Sensors, Thermography, Integrated optics

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Advanced autonomous detection of chemical warfare agents and toxic industrial chemicals has long been a major military concern. At present, our capability to rapidly assess the immediate environment is severely limited and our domestic infrastructure is burdened by the meticulous procedures required to rule out false threats. While significant advances have recently been accomplished in remote spectral sensing using rugged FTIRs and point detectors, efforts towards low cost chemical discrimination have been lacking. Foster-Miller has developed a unique waveguide spectrometer which is a paradigm shift from the conventional FTIR approach. The spectrometer provides spectral discrimination over the 3-14 μm range and will be the spectrometer platform for both active and passive detection. Foster-Miller has leveraged its innovations in infrared fiber-optic probes and the recent development of a waveguide spectrometer to build a novel infrared sensor platform for both point and stand-off chemical sensing. A monolithic wedge-grating optic provides the spectral dispersion with low cost thermopile point or array detectors picking off the diffracted wavelengths from the optic. The integrated optic provides spectral discrimination between 3-12 μm with resolution at 16 cm^-1 or better and overall optical throughput approaching 35%. The device has a fixed cylindrical grating bonded to the edge of a ZnSe conditioning “wedge”. The conditioning optic overcomes limitations of concave gratings as it accepts high angle (large FOV) light at the narrow end of the wedge and progressively conditions it to be near normal to the grating. On return, the diffracted wavelengths are concentrated on the discrete or array detector (pixel) elements by the wedge, providing throughput comparable to that of an FTIR. The waveguide spectrometer coupled to ATR probes, flow through liquid cells or multipass gas cells provides significant cost advantage over conventional sampling methodologies. We will present the enabling innovations along with present performance, sensitivity expectations and discrimination algorithm strategy.

Proceedings Article | 15 August 2003 Paper

Handheld chemical threat monitor for the soldier system

Suneet Chadha, Patrick Henning, Ani Weling, Franklin Landers, Alan Samuels

Proceedings Volume 5085, (2003) https://doi.org/10.1117/12.488670

KEYWORDS: Sensors, Spectroscopy, Liquids, FT-IR spectroscopy, Infrared radiation, Mid-IR, Absorption, Infrared sensors, Infrared detectors, Infrared spectroscopy

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Proceedings Article | 7 February 2002 Paper

Miniaturized spectrometer for stand-off chemical detection

Patrick Henning, Suneet Chadha, Richard Damren, Rebecca Rowe, Chuck Stevenson, Lawrence Curtiss, Thomas DiGiuseppe

Proceedings Volume 4574, (2002) https://doi.org/10.1117/12.455166

KEYWORDS: Sensors, Spectroscopy, Waveguides, Diffraction gratings, Chemical detection, Detector arrays, Infrared detectors, Infrared radiation, Infrared technology, Infrared spectroscopy

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