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You searched on: Author: leonard hanssen

Displaying records 141 to 150 of 164 records.
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141. Development and Calibration of Pyroelectric Radiometer Standards at NIST
Published: Date unknown
Authors: George P Eppeldauer, Jinan Zeng, Leonard M Hanssen
Abstract: The reference spectral power responsivity scale of NIST is being extended from the silicon range to the infrared (IR) using pyroelectric radiometers. Two transfer standard pyroelectric radiometers have been developed at NIST. The main design consider ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841021

142. Development of a Monochromatic Uniform Source Facility for Calibration of Radiance and Irradiance Detectors from 0.2 um to 12 um
Published: Date unknown
Authors: Keith R Lykke, Ping-Shine Shaw, Leonard M Hanssen, George P Eppeldauer
Abstract: A radiometric source facility is being constructed with narrow-band, widely tunable lasers from {difference} 200nm to 12 um. The output will be highly uniform and monochromatic. This facility will be used to make a wide variety of radiometric measu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840289

143. Effective Emissivity of a Cylindrical Cavity with an Inclined Bottom: I. Isothermal Cavity
Published: Date unknown
Authors: Leonard M Hanssen, A Prokhorov
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841836

144. FT-IR Based Ellipsometer Using High-Quality Brewster-Angle Polarizers
Published: Date unknown
Authors: Simon Grant Kaplan, Leonard M Hanssen
Abstract: A Fourier transform infrared (FT-IR) spectrometer-based broadband infrared ellipsometer has been developed around a pair of high-quality Brewster angle polarizers. These polarizers consist of four Ge plates in a chevron geometry and have been measur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841399

145. FT-IR Based Polarimeter with High-Quality Brewster-Angle Polarizers
Published: Date unknown
Authors: Simon Grant Kaplan, Leonard M Hanssen
Abstract: A Fourier transform infrared (FT-IR) spectrometer based broadband infrared polarimeter has been developed around a pair of high-quality Brewster angle polarizers. These polarizers consist of four Ge plates in a chevron geometry and have been measure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841753

146. IR Spectral Characterization of Customer Blackbody Sources: First Calibration Results
Published: Date unknown
Authors: Sergey Mekhontsev, Mart Noorma, A Prokhorov, Leonard M Hanssen
Abstract: We summarize recent progress in our infrared (IR) spectral radiance metrology effort. In support of customer blackbody characterization, a realization of the spectral radiance scale has been undertaken in the temperature range of 232 C to 962 C and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841007

147. Infrared Diffuse Reflectance Instrumentation and Standards at NIST
Published: Date unknown
Authors: Leonard M Hanssen, Simon Grant Kaplan
Abstract: A spectrophotometer system for spectral characterization of materials in the infrared has been built around a bench-top Fourier transform (FTIR) instrument. Its capabilities include the measurement of directional-hemispherical reflectance from 1 *m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841308

148. Infrared Optical Property Characterization in the Optical Technology Division
Published: Date unknown
Author: Leonard M Hanssen
Abstract: Accurate non-contact thermometry requires accurate knowledge of the opticla properties of the materials under test. Radiometric measurements of a sample at any given temperature will include reflected (and transmitted) light originating from the surr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841514

149. Methods for Absolute Reflectance Measurement of Transmissive Materials in the Infrared
Published: Date unknown
Authors: Leonard M Hanssen, Simon Grant Kaplan
Abstract: Four methods for the measurement of absolute reflectance are described and compared, with particular emphasis on application to transmissive materials such as windows and filters. Three of the methods, the V-W , V-N , and goniometer based methods, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841311

150. Methods for Evaluation of Transmittance Minima in Wavenumber Standards Spectra: A Comparison and Analysis
Published: Date unknown
Authors: Leonard M Hanssen, C. J. Zhu
Abstract: The final two elements in the process of wavenumber calibration of a spectrometer involve software processing. These are (a) the generation of a spectrum through the Fourier transform processing of the measured interferogram (for Fourier transform s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841637



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