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Search Publications by Catherine Cooksey

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Displaying 1 - 25 of 34

2019 Topical Meeting on Optical Interference Coatings: Manufacturing Problem Contest

December 2, 2019
Catherine C. Cooksey, Daniel Poitras, Li Li, Michael Jacobson
For the Seventh Manufacturing Problem contest, participants were asked to fabricate on a provided N-BK7 substrate a challenging filter with specific s-polarization transmittance spectra at angles of incidence of 10° and 50°, covering a wavelength range

Reflectance data set and variability study for human skin reflectance

July 1, 2019
Catherine C. Cooksey, David W. Allen, Benjamin K. Tsai
The optical properties of human skin have been of interest to researchers for some time. Their interest is based on a need to know for a variety of different applications, which range from spectral imaging for automated or stand-off detection, non-invasive

Exposure Study on the Aging of PTFE and Ceramic Diffusers

February 6, 2019
Benjamin K. Tsai, Catherine C. Cooksey, David W. Allen, Christopher C. White, Walter E. Byrd, Deborah S. Jacobs
This paper describes efforts to quantify the effects of aging in the ultraviolet (UV) on polytetrafluoroethylene (PTFE) and ceramic samples. Long term UV aging may significantly alter the reflectance factor and cause an error in the calibration of

Optimization of 6 LiF:ZnS(Ag) Scintillator Light Yield using GEANT4

June 1, 2018
Y. Yehuda-Zada, Kevin NMN Pritchard, Jeffrey B Ziegler, Catherine C Cooksey, Kerry NMN Siebein, M. Jackson, C. Hurlbut, Y. Kadmon, Y. Cohen, R. M. Ibberson, Charles F. Majkrzak, Nick C. Maliszewskyj, I. Orion, A. Osovizky
A new cold neutron detector has been developed at the NCNR for the CANDoR project. Geometric and performance constraints dictate that this detector be exceptionally thin (~2nm). For this reason, the design of the detector consists of 6LiF:ZnS(Ag)

6 LiF:ZnS(Ag) Mixture Optimization for a Miniature Highly Efficient Cold Neutron Detector

April 2, 2018
A. Osovizky, Kevin NMN Pritchard, Jeffrey B Ziegler, Louis Edward Binkley, Y. Yehuda-Zada, Peter NMN Tsai, Alan Keith Thompson, Catherine C Cooksey, Kerry NMN Siebein, Nancy Jane Hadad, M. Jackson, C. Hurlbut, R. Ibberson, George M Baltic, Charles F. Majkrzak, Nick C. Maliszewskyj
We report the optimization of a ^6^LiF:ZnS(Ag) scintillator mixture for an ultrathin (~2nm), highly efficient cold neutron dector. Preliminary results with early protypes demonstrate excellent for 3.62 meV (4.75 Angstrom wavelenght) neutrons but mediocre

Correction of an adding-doubling inversion algorithm for the measurement of the optical parameters of turbid media

January 1, 2018
Paul Lemaillet, Catherine C. Cooksey, Jeeseong Hwang, Heidrun Wabnitz, Dirk Grosenick, Lin Yang, David W. Allen
We present broadband measurements of the optical properties of tissue-mimicking solid phantoms using a single integrating sphere to measure the hemispherical reflectance and transmittance under a direct illumination at the normal incident angle. These

Algorithm for rapid determination of optical scattering parameters

October 18, 2017
Zachary H. Levine, Adam L. Pintar, Richelle H. Streater, Anne-Michelle R. Lieberson, Catherine C. Cooksey, Paul Lemaillet
Preliminary experiments at the NIST Spectral Tri-function Automated Reference Reflectometer (STARR) facility have been conducted with the goal of providing the diffuse optical properties of a solid reference standard with optical properties similar to

Low-NEP pyroelectric detectors for calibration of UV and IR sources and detectors

September 6, 2017
George P. Eppeldauer, Vyacheslav B. Podobedov, Leonard M. Hanssen, Catherine C. Cooksey
Pyroelectric radiometers with spectrally constant response have been developed at NIST with the cooperation of a few detector manufacturers. The new devices have noise-equivalent-power (NEP) values less than 1 nW/Hz^1/2 sufficiently low for use at the


September 5, 2017
Catherine C. Cooksey, Georgi T. Georgiev, James Butler, Kurtis J. Thome, Leibo Ding
Satellite instruments operating in the reflective solar wavelength region require accurate and precise determination of the Bidirectional Reflectance Distribution Functions (BRDFs) of the laboratory and flight diffusers used in their pre-flight and on

Reference Data Set of Human Skin Reflectance

June 7, 2017
Catherine C. Cooksey, David W. Allen, Benjamin K. Tsai
This data set contains 100 reference reflectance spectra of human skin, spanning the wavelength region from 250 nm to 2500 nm. The spectra were acquired with a commercial spectrophotometer and are directly traceable to the national scale for directional

Validating In-Air Remote Sensing Reflectance Measurements During Cruises Using Reflectance Targets

October 25, 2016
Bettye C. Johnson, Catherine C. Cooksey, Ahmed El-Habashi, David English, Georgi T. Georgiev, Sherwin Ladner, Veronica P. Lance, Michael Ondrusek, Ryan Vandermeulen
Annual dedicated ocean color validation cruises off the East Coast of the USA were started in November 2014 with support from the NOAA office of Marine and Air Operations with primary focus on VIIRS/SNPP and upcoming JPSS missions. A portion of the

2016 Topical Meeting on Optical Interference Coatings: Manufacturing Problem Contest

October 21, 2016
Catherine C. Cooksey, Daniel Poitras, Li Li, Michael Jacobson
For the Manufacturing Problem contest held in conjunction with OSA’s 2016 Topical Meeting on Optical Interference Coatings, participants were asked to design and fabricate on a provided substrate a coating with very specific (and rather peculiar)

Broadband Radiometric LED Measurements

September 7, 2016
George P. Eppeldauer, Catherine C. Cooksey, Howard W. Yoon, Leonard M. Hanssen, Vyacheslav B. Podobedov, Robert E. Vest, Uwe Arp, Carl C. Miller
At present, broadband radiometric measurements of LEDs with uniform and low-uncertainty results are not available. Currently, either spectral radiometric measurements or broadband photometric LED measurements are used. The broadband photometric

National Institute of Standards and Technology measurement service of the optical properties of biomedical phantoms: Current status

March 24, 2016
Paul Lemaillet, Catherine C. Cooksey, Zachary H. Levine, Adam L. Pintar, Jeeseong Hwang, David W. Allen
The National Institute for Standards and Technology (NIST) has maintained scales of reflectance and transmittance over several decades. Those scales are primarily intended for the regular transmittance, mirrors, and solid surface scattering diffusers. The

SPIE 9639-49 Creation and Validation of Spectralon BRDF Targets & Standards

October 12, 2015
Catherine C. Cooksey, Gael Obein, Georgi T. Georgiev, Christopher Durell, Dan Scharpf, Greg McKee, Michelle L'Heureux
Spectralon is an extremely stable, near-perfect lambertian reflecting diffuser and calibration standard material that has been used by national labs, space, aerospace and commercial sectors for over two decades. New uncertainty targets of 2% on-orbit

Spectral reflectance variability of skin and attributing factors

May 21, 2015
Catherine C. Cooksey, Benjamin K. Tsai, David W. Allen
Knowledge of the spectral reflectance signature of human skin over a wide spectral range will help advance the development of sensing systems for many applications, ranging from medical treatment to security technology. A critical component of the

Bidirectional reflectance scale comparison between NIST and PTB

May 1, 2015
Catherine C. Cooksey, Maria E. Nadal, David W. Allen, Kai-Olaf Hauer, Andreas Hoepe
A comparison of bidirectional reflectance scales between the National Institute of Standards and Technology (NIST) and the Physikalisch-Technische Bundesanstalt (PTB) has been performed. Measurements of two sets of white diffuse reflectance standards, two

Sensor Calibration and Characterization to Meet Climate Monitoring Requirements

April 24, 2014
Catherine C. Cooksey, Gerald T. Fraser, Howard W. Yoon
The challenge of detecting small changes in the Earth's climate system over decadal and longer time scales places stringent requirements on environmental monitoring systems. Sensors must be well calibrated and maintain their calibration in challenging

Broadband transmission filter 2013 OIC manufacturing problem contest

January 10, 2014
Catherine C. Cooksey, Li Li, J. A. Dobrowolski, Michael Jacobson
A broadband transmission filter from 400nm to 1100nm was selected for the manufacturing problem contest. The premise of the contest is to test the state of the art of current optical thin film manufacturing capabilities. A total 37 people from 15 teams