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Author: leonard hanssen

Displaying records 121 to 130 of 150 records.
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121. Comments on Absolute Linearity Measurements on a PbS Detector in the Infrared
Published: Date unknown
Authors: Leonard M Hanssen, Zhuomin Zhang
Abstract: The recent publication by Theocharous (Appl. Opt 45, 2381 (2006) contains serious misunderstandings of an earlier work by Zhan et al. (Appl. Spectrosc. 51, 576 (1997)). This comment provides some clarifications for the readers to correctly understand ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841087

122. Comparison of Direct and Indirect Methods of Spectral Infrared Emittance Measurement
Published: Date unknown
Authors: Leonard M Hanssen, A Prokhorov, V B Khromchenko, Sergey Mekhontsev
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841813

123. Design and Evaluation of Large Aperture Gallium Fixed Point Blackbody
Published: Date unknown
Authors: V B Khromchenko, Sergey Mekhontsev, Leonard M Hanssen
Abstract: To complement existing water bath blackbodies which are now serving as NIST primary standard sources in the temperature range from 15 C to 75 C, a gallium fixed point blackbody has been recently built. The main objectives of the project included cr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841105

124. 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

125. 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

126. 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

127. Emittance Standards for Improved Radiation Thermometry During Thermal Processing of Silicon Materials
Published: Date unknown
Authors: Benjamin K Tsai, D P DeWitt, E A. Early, Leonard M Hanssen, Sergey Mekhontsev, Matthias Rink, Kenneth Gruber Kreider, B J Lee, Zhuomin Zhang
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841831

128. 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

129. 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

130. 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



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