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Author: leonard hanssen
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1. Absorption and Reflection of Infrared Radiation by Polymers in Fire-Like Environments
Published: 7/17/2012
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908058

2. BRDF measurements of graphite used in high-temperature fixed point blackbody radiators: a multi-angle study at 405 nm and 658 nm
Published: 3/12/2012
Authors: Heather J Patrick, Leonard M Hanssen, Jinan Zeng, Thomas Avery Germer
Abstract: We have measured angle- and polarization-resolved, hemispherical bidirectional reflectance distribution function (BRDF) for two types of graphite used in the fabrication of high temperature fixed point (HTFP) blackbody cavities. Measurements were m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909520

3. Increased responsivity pyroelectric radiometer with dome input and temperature control
Published: 7/18/2011
Authors: George P Eppeldauer, Jinan Zeng, Leonard M Hanssen
Abstract: Pyroelectric radiometers with noise-equivalent-power (NEP) close to 1 nW/Hz¿ have been developed to measure less than 1 microwatt radiant power levels at room temperature to 25 micrometer. The radiometers will be used as transfer standards for routin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908993

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841107

10. 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
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104059



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