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You searched on: Author: leonard hanssen

Displaying records 21 to 30 of 164 records.
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21. An infrared laser-based reflectometer for low reflectance measurements of samples and cavity structures
Published: 9/15/2008
Authors: Leonard M Hanssen, Jinan Zeng
Abstract: An instrument, the Complete Hemispherical Infrared Laser-based Reflectometer (CHILR), has been designed and built for the accurate characterization of the total reflectance of highly absorbing samples and cavity structures down to the level of 10-5 ...

22. Angle-dependent infrared reflectance measurements in support of VIIRS
Published: 8/14/2008
Authors: Simon Grant Kaplan, Leonard M Hanssen, Enrique J. Iglesias
Abstract: We have developed a goniometric reflectometer using a Fourier-transform infrared (FTIR) spectrometer source for polarized reflectance measurements from 1 um to 20 um wavelength at angles of incidence from 10° to 80°, with an incident beam geometry of ...

23. Evaluation of Blackbody Cavity Emissivity in the Infrared Using Total Integrated Scatter Measurements
Published: 2/1/2008
Authors: Leonard M Hanssen, Sergey Mekhontsev, Jinan Zeng, A Prokhorov
Abstract: Deviations from ideal blackbody (BB) behavior can be characterized by a BB s effective emissivity. The cavity emissivity is most often obtained through a model, given a particular set of input parameters associated with the BB cavity geometry and sur ...

24. Radiation Properties of IR Calibrators With V-Grooved Surfaces
Published: 4/1/2006
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 ...

25. Design and characterization of Si and InGaAs pyrometers for radiance temperature scale realization between 232 {?}C and 962 {?}C
Published: 1/1/2006
Authors: Mart Noorma, Sergey Mekhontsev, K Khromchenko, Alex Gura, Maritoni Abatayo Litorja, Benjamin K Tsai, Leonard M Hanssen

26. Development and calibration of pyroelectric radiometer standards at NIST
Published: 1/1/2006
Authors: George P Eppeldauer, Zeng j, Leonard M Hanssen

27. Development and calibration of pyroelectric radiometer standards at NIST
Published: 1/1/2006
Authors: George P Eppeldauer, Jinan Zeng, Leonard M Hanssen

28. Radiation properties of IR calibrators with V-grooved surfaces
Published: 1/1/2006
Authors: Alexander Prokhorov, Leonard M Hanssen, Sergey Mekhontsev

29. Water heat pipe blackbody as a reference spectral radiance source between 50 {?}C and 250 {?}C
Published: 1/1/2006
Authors: Mart Noorma, Sergey Mekhontsev, V B Khromchenko, Maritoni Abatayo Litorja, Claus Cagran, Jinan Zeng, Leonard M Hanssen

30. SRM 2036 Near Infrared Reflection Wavelength Standard
Published: 11/1/2005
Authors: David Lee Duewer, Steven J Choquette, Leonard M Hanssen, E A. Early

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