Mr. Frederick L. Williams Profile

Frederick L. Williams

Senior Staff Engineer at L3Harris Technologies Inc

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Author

Publications (10)

Proceedings Article | 4 November 2004 Paper

Performance of the CrIS engineering development unit

Ronald Glumb, Frederick Williams, Joseph Predina

Proceedings Volume 5543, (2004) https://doi.org/10.1117/12.566490

KEYWORDS: Long wavelength infrared, Sensors, Infrared radiation, Mid-IR, Short wave infrared radiation, Earth's atmosphere, Spectral resolution, Interferometers, Prototyping, Data modeling

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Proceedings Article | 10 November 2003 Paper

The spectral characterization of the Cross-track Infrared Sounder (CrIS) engineering model: updated methodology and initial test results

Frederick Williams

Proceedings Volume 5152, (2003) https://doi.org/10.1117/12.508543

KEYWORDS: Sensors, Transmittance, Temperature metrology, Carbon dioxide lasers, Collimators, Gases, Carbon dioxide, Calibration, Data analysis, Mirrors

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Proceedings Article | 10 November 2003 Paper

Cross-track Infrared Sounder (CrIS) development status

Ronald Glumb, Frederick Williams, Nathan Funk, Francois Chateauneuf, Alan Roney, Roch Allard

Proceedings Volume 5152, (2003) https://doi.org/10.1117/12.508544

KEYWORDS: Infrared radiation, Interferometers, Sensors, Transmittance, Earth's atmosphere, Spectral resolution, Prototyping, Long wavelength infrared, Data modeling, Remote sensing

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Proceedings Article | 18 December 2002 Paper

Spatial and spectral characterization of the Crosstrack Infrared Sounder (CrIS): test development

Frederick Williams, Roger Johnston

Proceedings Volume 4818, (2002) https://doi.org/10.1117/12.458120

KEYWORDS: Sensors, Collimators, Absorption, Infrared radiation, Wavefronts, Calibration, Modulation transfer functions, Spectral resolution, Gases, Infrared sensors

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Proceedings Article | 8 February 2002 Paper

Derivation and allocation of requirements for the Crosstrack Infrared Sounder (CrIS)

Frederick Williams, Karl Schwantes, David Jordan, Ronald Glumb

Proceedings Volume 4486, (2002) https://doi.org/10.1117/12.455125

KEYWORDS: Sensors, Calibration, Printed circuit board testing, Infrared radiation, Infrared sensors, Long wavelength infrared, Temperature metrology, Black bodies, Mid-IR, Radio optics

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Proceedings Article | 15 November 2000 Paper

Spectral band calibration of the Total Ozone Mapping Spectrometer (TOMS) using a tunable laser technique

Robert Haring, Frederick Williams, Ulli Hartmann, Doug Becker, Gary Vanstone, Hongwoo Park, Pawan Bhartia, Richard McPeters, Glen Jaross, Matthew Kowalewski

Proceedings Volume 4135, (2000) https://doi.org/10.1117/12.494208

KEYWORDS: Calibration, Dye lasers, Ultraviolet radiation, Monochromators, Sensors, Mirrors, Integrating spheres, Power meters, Visible radiation, Lamps

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The Total Ozone Mapping Spectrometer (TOMS) provides daily global mapping of the total column ozone in the earth’s atmosphere. It does this by measuring the solar irradiance and the backscattered solar radiance in 6 spectral bands falling within the range from 308.6 nm to 360 nm. The accuracy of the ozone retrieval is highly dependent on the knowledge of the transfer characteristics and center wavelength for each spectral band. A 0.1 nm wavelength error translates to a 1.6% error in ozone. Several techniques have historically been used to perform the wavelength calibration of the TOMS instruments. These methods include the use of film and reference spectra from low-pressure spectral line lamps and the use of continuum sources with a narrow-band scanning monochromator. The spectral transfer characteristic of the Flight Model 5 instrument for the QuikTOMS mission was calibrated using a new technique employing a frequency doubled tunable dye laser. The tunable laser has several advantages that include a very narrow spectral bandwidth; accurate wavelength determination using a wavemeter; and the ability to calibrate the instrument system level of assembly (prior methods required that the calibration be performed at the monochromator sub assembly level). The technique uses the output from a diode-pumped solid state Nd:V04 laser that is frequency doubled to provide a continuous wave 532 nm pump laser beam to a Coherent Model 899-01 frequency doubled ring dye laser. The output is directed into the entrance port of a 6-inch diameter Spectralon integrating sphere. A GaP photodiode is used to monitor the sphere wall radiance while a Burleigh Wavemeter (WA-1500) is used to monitor the wavelength of the visible output of the dye laser. The TOMS field of view is oriented to view the exit port of the integrating sphere. During the measurement process the response of the instrument is monitored as the laser source is stepped in 0.02-nm increments over each of the six TOMS spectral bands. Results of the new technique allow establishing the wavelength center to a precision of better than 0.1 nm. In addition to the spectral band measurements, the laser provided a means to calibrate the radiometric linearity of the QuikTOMS instrument and yield new insights into the stray light performance of the complete optical system.

Proceedings Article | 6 December 1999 Paper

WFIS: a wide field-of-view imaging spectrometer

Robert Haring, Frederick Williams, Gary Vanstone, Gloria Putnam

Proceedings Volume 3759, (1999) https://doi.org/10.1117/12.372678

KEYWORDS: Spectroscopy, Mirrors, Code v, Imaging systems, Telescopes, Spectral resolution, Off axis mirrors, Optical design, Hyperspectral imaging, Distortion

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Proceedings Article | 21 November 1996 Paper

Interferometric spectrometer for the next-generation GOES sounder

Michael Gangl, Ronald Glumb, Joseph Predina, Richard Kohrman, Frederick Williams, Martin Chamberland

Proceedings Volume 2832, (1996) https://doi.org/10.1117/12.258881

KEYWORDS: Interferometers, Mirrors, Sensors, Electronics, Filtering (signal processing), Long wavelength infrared, Spectral resolution, Optical filters, Digital signal processing, Semiconductor lasers

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Proceedings Article | 18 October 1996 Paper

Impact of the visible detector design on GOES imager and sounder MTF

Frederick Williams, David Wickholm, John Ehlert

Proceedings Volume 2812, (1996) https://doi.org/10.1117/12.254101

KEYWORDS: Sensors, Modulation transfer functions, Stray light, Imaging systems, Signal detection, Reflectivity, Reflection, Telescopes, Stars, Mirrors

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Proceedings Article | 18 October 1996 Paper

Comparison between subsystem and system optical MTF for GOES imager

Frederick Williams, John Ehlert, David Wickholm

Proceedings Volume 2812, (1996) https://doi.org/10.1117/12.254073

KEYWORDS: Modulation transfer functions, Collimators, Imaging systems, Sensors, Mirrors, Telescopes, Wavefronts, Diffraction, Optical testing, Optical fabrication

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Showing 5 of 10 publications

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