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Author: leonard hanssen

Displaying records 141 to 150.
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141. Problems Posed by Scattering Transmissive Materials for Accurate Transmittance and Reflectance Measurements
Published: Date unknown
Authors: Leonard M Hanssen, Simon Grant Kaplan
Abstract: The characterization of the spectral transmittance and reflectance of windows and other optical components is a basic and important measurement. In principal, the measurements are relatively straightforward. However, even with an ideal high-accurac ...

142. Radiation Properties of IR Calibrators With V-Grooved Surfaces
Published: Date unknown
Authors: Leonard M Hanssen, A Prokhorov, Sergey Mekhontsev
Abstract: Use of linear or concentric grooves is a well-known approach for increasing the surface emissivity to enable the construction of compact blackbody radiators, improve absorptance of stray radiation traps, baffles and thermal radiation detectors, as we ...

143. Radiative Properties of Blackbody Calibration Sources: Recent Advances in Computer Modeling
Published: Date unknown
Authors: A Prokhorov, Sergey Mekhontsev, Leonard M Hanssen
Abstract: The radiative characteristics (spectral effective emissivity, spectral radiance, and radiance temperature) of blackbody calibration sources widely used in radiation thermometry are an important subject for advanced computer modeling by the Monte Carl ...

144. Reciprocity Principle and Choice of the Reflectance Model for Physically Correct Modeling of Effective Emissivity
Published: Date unknown
Authors: A Prokhorov, Leonard M Hanssen, Sergey Mekhontsev
Abstract: In the last two decades considerable Progress has been made in numerical modeling of isothermal and non-isothermal cavities by the Monte Carlo method, in particular, by the use of the uniform specular-diffuse reflection model and backward ray tracing ...

145. Temperature-Resolved Infrared Spectral Normal Emissivity of SiC and Pt-10Rh for Temperatures up to 900 C
Published: Date unknown
Authors: Claus Cagran, Leonard M Hanssen, Mart Noorma, Alex Gura, Sergey Mekhontsev
Abstract: This paper reports the first comprehensive results obtained from a fully functional, recently established infrared spectral emissivity capability at National Institute of Standards and Technology (NIST). First, sample surface temperatures are obtaine ...

146. The Magnification of Conic Mirror Reflectometers
Published: Date unknown
Authors: K A Snail, Leonard M Hanssen
Abstract: Conic mirror reflectometers are used to measure the diffuse reflectance and total integrated scatter of surfaces. In spite of the long history of using conic mirrors for these purposes, the maximum magnification of the three primary types of conic m ...

147. Thermal, Structural, and Optical Properties of Multispectral Zinc Sulfide
Published: Date unknown
Authors: L Henneman, L LaCroix, C Wilson, S Kurzius, D C Harris, M Baronowski, B Burns, K Kitagawa, J Gembarovic, S Goodrich, Leonard M Hanssen, Simon Grant Kaplan, C Staats, J Mecholsky
Abstract: Lockheed Martin Space Systems Company (LMSSC) and Vicus Technologies have conducted a study to obtain the thermal, structural and optical property data required to predict the flight performance of Multispectral Zinc Sulfide (MS ZnS) windows. The Nav ...

148. Use of a High Temperature Integrating Sphere Reflectometer for Surface Temperature Measurements
Published: Date unknown
Authors: Leonard M Hanssen, Claus Cagran, A Prokhorov, Sergey Mekhontsev, V B Khromchenko
Abstract: NIST has developed a new facility for the characterization of the infrared spectral emissivity of samples between ambient and 1000 C. For accurate measurement of the sample surface temperatures above 300 C, the system employs a high temperature refle ...

149. Validation of the Infrared Emissivity Characterization of Materials Through Intercomparison of Direct and Indirect Methods
Published: Date unknown
Authors: Leonard M Hanssen, Sergey Mekhontsev, V B Khromchenko
Abstract: A comparison of the spectral directional emissivity of samples as a function of wavelength was performed at the Fourier Transform Infrared Spectrophotometry (FTIS) Facility and the Advanced Infrared Radiometry and Imaging (AIRI) Laboratory at NIST. A ...

150. Water Heat Pipe Blackbody as a Reference Spectral Radiance Source Between 50 C and 250 C
Published: Date unknown
Authors: Mart Noorma, Sergey Mekhontsev, V B Khromchenko, Maritoni Abatayo Litorja, Claus Cagran, Jinan Zeng, Leonard M Hanssen
Abstract: Realization of a radiometric temperature scale for near ambient temperatures with high accuracy is crucial for a number of demanding military and commercial applications. Reliable radiation sources with high stability and good spatial uniformity have ...

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