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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 Hannes 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 Hannes 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 Hannes 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. 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 Hannes 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

7. 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

8. 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

9. 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

10. Development and calibration of pyroelectric radiometer standards at NIST
Published: 1/1/2006
Authors: George P Eppeldauer, Zeng j, Leonard M Hanssen
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104437