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Author: leonard hanssen

Displaying records 11 to 20 of 162 records.
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11. Absorption of Thermal Radiation by Burning Polymers
Published: 2/2/2011
Authors: Gregory T Linteris, Mauro Zammarano, Boris Wilthan, Leonard M Hanssen
Abstract: In large-scale fires, the input of energy to burning materials occurs predominantly by radiative transfer. The in-depth absorption of radiant energy by a polymer influences its ignition time and burning rate. The present investigation examines two m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907602

12. Preliminary characterization study of a gold-coated concentrator for hemispherical longwave irradiance measurements
Published: 11/15/2010
Authors: Jinan Zeng, Leonard M Hanssen, Ibrahim Reda, Jonathan Scheuch
Abstract: We report the preliminary characterization results of a gold-coated concentrator used for longwave irradiance measurements[1]. Throughput measurements of the concentrator are conducted at 1.562 μm and 10.15 μm using two different approaches ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906604

13. Very black infrared detector from vertically aligned carbon nanotubes and electric-field poling of lithium tantalate
Published: 8/3/2010
Authors: John H Lehman, Aric Warner Sanders, Leonard M Hanssen, Boris Wilthan, Jinan Zeng, Christopher Jensen
Abstract: Vertically aligned multiwall carbon nanotubes were grown by water-assisted chemical vapor deposition on a large-area lithium tantalate pyroelectric detector. The processing parameters are nominally identical to those by which others have achieved the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905054

14. Spectral irradiance responsivity calibration of InSb radiometers using the improved IR-SIRCUS at NIST
Published: 10/15/2009
Authors: Jinan Zeng, Howard W Yoon, George P Eppeldauer, Leonard M Hanssen, Joseph Paul Rice
Abstract: The spectral irradiance responsivity calibrations of InSb radiometers measured on the tunable-laser based Infrared Spectral Irradiance and Radiance Responsivity Calibration with Uniform Sources (IR-SIRCUS) facility are discussed. This work describes ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903522

15. Development of an infrared optical scattering instrument from 1 um to 5 um
Published: 10/1/2009
Authors: Jinan Zeng, Leonard M Hanssen
Abstract: The wavelength coverage of the IR optical scattering instrument developed at the National Institute of Standards and Technology has been extended to cover the continuous range from 1 um to 5 um. Besides the previously available diode lasers at wavele ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903521

16. Extension of the NIST spectral responsivity scale to the infrared using improved-NEP pyroelectric detectors
Published: 6/2/2009
Authors: George P Eppeldauer, Jinan Zeng, Howard W Yoon, Boris Wilthan, Thomas C Larason, Leonard M Hanssen
Abstract: Routine NIST spectral responsivity calibrations are needed for the infrared range. Low NEP pyroelectric radiometers have been developed for traditional monochromator applications to extend the responsivity scale to the infrared. After NEP tests, the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900961

17. Thermal Performance of Fire Resistive Materials III. Fire Test on a Bare Steel Column
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7576
Published: 4/1/2009
Authors: Dale P Bentz, Leonard M Hanssen, Boris Wilthan
Abstract: This report is part III in an ongoing series concerning the characterization and modeling of the thermal performance of fire resistive materials (FRMs). In part I, a methodology for characterizing FRMs to provide quantitative material property input ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902119

18. Calibration of the spectral radiant power responsivity of windowed pyroelectric radiometers from 785 nm to 14 ¿m
Published: 9/16/2008
Authors: Leonard M Hanssen, Jinan Zeng
Abstract: As part of the optical detector characterization program at the Optical Technology Division at NIST, we have established a capability for the calibration of spectral radiant power responsivity in the infrared from 785 nm to 14 μm. We have ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842546

19. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842545

20. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842529



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