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Author: leonard hanssen
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1. Spectral Emissivity Measurements
Published: 7/10/2014
Authors: Leonard M Hanssen, Hiromichi Watanabe, Juntaro Ishii, Hidenobu Wakabayashi, Tomoyuki Kumano
Abstract: Chapter 9 describes the wide variety of experimental instrumentation and methods used for spectral emissivity measurements at both ambient and elevated temperatures, along with specific examples of materials studied. There are a number of measurement ...

2. New Developments in the NIST Infrared Optical Properties of Materials Program
Published: 7/1/2014
Authors: Leonard M Hanssen, Sergey Mekhontsev, Jinan Zeng, John H Burnett
Abstract: The Infrared Optical Properties of Materials program in the Sensor Science Division at the National Institute of Standards and Technology (NIST) continues to upgrade its capabilities to provide comprehensive coverage of measurable infrared optical pr ...

3. Evaluation of dome-input geometry for pyroelectric detectors
Published: 6/24/2013
Authors: Jinan Zeng, Leonard M Hanssen, George P Eppeldauer
Abstract: Dome-input pyroelectric radiometers with different black coatings were developed to extend the spectral responsivity scale from near infrared (NIR) to 20 μm. The reflective dome with shiny gold-coating has been known to be an efficient light t ...

4. Measurements of Infrared Spectral Directional Emittance at NIST ‹ A Status Update
Published: 9/12/2012
Authors: Boris Wilthan, Leonard M Hanssen, Sergey Mekhontsev
Abstract: Over the past two decades, the Sensor Science Division at the National Institute of Standards and Technology (NIST) has developed extensive capabilities for the characterization of the infrared optical properties of materials and components. These ...

5. Spectral responsivity calibrations of two type pyroelectric radiometers using three different methods
Published: 8/15/2012
Authors: Jinan Zeng, George P Eppeldauer, Leonard M Hanssen, Vyacheslav B Podobedov
Abstract: Spectral responsivity calibrations of two different type pyroelectric radiometers have been made in infrared region up to 14 μm in power mode using three different calibration facilities at NIST. One pyroelectric radiometer is a temperature-cont ...

6. 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 ...

7. 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 ...

8. An absolute cavity pyrgeometer to measure the absolute outdoor longwave irradiance with traceability to International System of Units, SI
Published: 3/1/2012
Authors: Ibrahim Reda, Jinan Zeng, Jonathan Scheuch, Leonard M Hanssen, Daryl Myers, Boris Wilthan, Tom Stoffel
Abstract: This article describes a method of measuring the absolute outdoor longwave irradiance using an absolute cavity pyrgeometer (ACP). The ACP consists ofa domeless thermopile pyrgeometer, gold- plated concentrator, temperature controller, and data acqu ...

9. A Determination Study of The Cavity Emissivity of the Eutectic Fixed Points Co-C, Pt-C and Re-C
Published: 12/5/2011
Authors: Leonard M Hanssen, Yohsiro Yamada, Pieter Bloembergen, Pablo Castro, Boris Wilthan, Sergey Mekhontsev
Abstract: The eutectics Co-C, Pt-C and Re-C, with phase transition temperatures of 1597 K, 2011 K, and 2747 K, respectively, are presently investigated for their suitability to serve as reference points for dissemination of T (and T90) within the context of th ...

10. 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 ...

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