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You searched on: Author: howard yoon

Displaying records 1 to 10 of 127 records.
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1. Calibration procedure for UV-365 integrated irradiance measurements
Published: 9/8/2015
Authors: George P Eppeldauer, Thomas C Larason, Robert Edward Vest, Uwe Arp, Howard W Yoon
Abstract: Since the CIE standardized rectangular-shape spectral response function for the 320 nm to 400 nm wavelength range can be realized only with large spectral mismatch, the realized UV-A meters have different response functions resulting in large errors ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918874

2. Standardization of UV LED measurements
Published: 9/8/2015
Authors: George P Eppeldauer, Thomas C Larason, Howard W Yoon
Abstract: Traditionally used source spectral-distribution or detector spectral-response based standards cannot be applied for accurate UV LED measurements. Since the CIE standardized rectangular-shape spectral response function for UV measurements cannot be re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919079

3. Guidelines for Radiometric Calibration of Electro-Optical Instruments for Remote Sensing
Series: Handbook (NIST HB)
Report Number: 157
Published: 5/8/2015
Authors: Howard W Yoon, Raghu N Kacker
Abstract: This publication provides guidelines for conducting radiometric calibrations of electro-optical (EO) sensors. It is intended for use by managers, technical oversight personnel, scientists, and engineers as a reference for planning and successfull ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918208

4. Establishment and application of the 0/45 reflectance factor scale over the shortwave infrared
Published: 4/1/2015
Authors: Catherine C Cooksey, David W Allen, Benjamin K Tsai, Howard W Yoon
Abstract: This paper describes the establishment and application of the 0/45 reflectance factor scale in the shortwave infrared (SWIR) from 1100 nm to 2500 nm. Design, characterization, and the demonstration of a 4-stage, extended indium-gallium-arsenide radi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917390

5. Principles of Optical Radiometry and Measurement Uncertainty
Published: 11/27/2014
Authors: Bettye C Johnson, Howard W Yoon, Joseph Paul Rice, Albert C Parr
Abstract: The fundamental concepts of optical radiometry are developed from basic principles, with detailed explanations for radiance, irradiance, and reflectance. Examples of radiometric standards, in particular radiometers and reference sources are given, an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915699

6. IR-enhanced Si reference detectors for 1-step scale transfers from 300 nm to 1000 nm
Published: 11/20/2014
Authors: George P Eppeldauer, Thomas C Larason, Jeanne M Houston, Robert Edward Vest, Uwe Arp, Howard W Yoon
Abstract: IR-enhanced Si photodiodes have improved radiometric and electronic characteristics as compared to other widely used Si photodiodes and can be used as responsivity standards in the wavelength range from 300 nm to 1000 nm. Their low predicted uncerta ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916505

7. Dispersive Methods
Published: 7/1/2014
Authors: Arnold A. Gaertner, Howard W Yoon, Thomas Avery Germer
Abstract: Chapter 3 will discuss dispersive means of obtaining spectral resolution in spectrophotometry. These methods are used to spatially disperse or separate the various wavelengths of optical electromagnetic radiation to enable analysis of material proper ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915685

8. Large-area irradiance-mode spectral response measurements of solar cells by a light-emitting-diode- based integrating sphere source
Published: 5/30/2014
Authors: Behrang H Hamadani, John F Roller, Andrew M. Shore, Brian P Dougherty, Howard W Yoon
Abstract: An irradiance-mode absolute differential spectral response measurement system based on a light emitting diode (LED) array is described. The LEDs are coupled to an integrating sphere whose output irradiance is uniform to better than 2 % over an ar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915298

9. Sensor Calibration and Characterization to Meet Climate Monitoring Requirements
Published: 4/24/2014
Authors: Catherine C Cooksey, Gerald T Fraser, Howard W Yoon
Abstract: 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 challengin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915271

10. Fast and Reliable Spectral Response Measurements of PV Cells Using Light Emitting Diodes
Published: 1/1/2014
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: We present a measurement system for absolute differential spectral responsivity of solar cells based on high-powered LED arrays coupled to an optical light guide capable of large area illumination. Two different measurement techniques were developed ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913952



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