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Author: leonard hanssen

Displaying records 131 to 140 of 162 records.
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131. Studies of Diamond Deposition With 1-D and 2-D Combustion Flames, ed. by Messier, Glass, Butler and Roy
Published: 1/1/1991
Authors: K A Snail, D B Oakes, J E Butler, Leonard M Hanssen

132. Absorption Line Evaluation Methods for Wavelength Standards
Published: Date unknown
Authors: C. J. Zhu, Leonard M Hanssen
Abstract: Two methods for absorption line (peak) evaluation based on center of gravity (CG) calculations are described and compared using spectra of the NIST standard reference material (SRM) 1921(a) characterization measurements. These methods are (1) calcul ...

133. Calibration of a Spectral Responsivity Transfer Standard
Published: Date unknown
Authors: George P Eppeldauer, Leonard M Hanssen
Abstract: A NIST-Developed pryoelectric radiometer was characterized and calibrated to extend the NIST high accuracy spectral responsively scale from the visible range to the ultraviolet (UV) and infrared (IR). The transmission of the gold-black coated LiNbO^ ...

134. Characterization of High-OD Ultrathin Infrared Neutral Density Filters
Published: Date unknown
Authors: Simon Grant Kaplan, Leonard M Hanssen, Alan L Migdall, G Lefever-Button
Abstract: We have performed transmittance measurements of metal-film neutral density filters on ultrathin polymer substrates using both Fourier-transform infrared spectrometer and laser-based (3.39 mm and 10.6 mm) systems. The use of ultrathin substrates, fre ...

135. Characterization of Narrow-Band Infrared Interference Filters
Published: Date unknown
Authors: Simon Grant Kaplan, Leonard M Hanssen
Abstract: A Fourier-transform infrared (FT-IR) spectrophotometer system is used to measure the transmittance of infrared band-pass filters as a function of wavelength, temperature, and beam geometry. Measurements are performed using an f/4 beam geometry at no ...

136. Comments on Absolute Linearity Measurements on a PbS Detector in the Infrared
Published: Date unknown
Authors: Leonard M Hanssen, Zhuomin Zhang
Abstract: The recent publication by Theocharous (Appl. Opt 45, 2381 (2006) contains serious misunderstandings of an earlier work by Zhan et al. (Appl. Spectrosc. 51, 576 (1997)). This comment provides some clarifications for the readers to correctly understand ...

137. Comparison of Direct and Indirect Methods of Spectral Infrared Emittance Measurement
Published: Date unknown
Authors: Leonard M Hanssen, A Prokhorov, V B Khromchenko, Sergey Mekhontsev

138. Design and Evaluation of Large Aperture Gallium Fixed Point Blackbody
Published: Date unknown
Authors: V B Khromchenko, Sergey Mekhontsev, Leonard M Hanssen
Abstract: To complement existing water bath blackbodies which are now serving as NIST primary standard sources in the temperature range from 15 C to 75 C, a gallium fixed point blackbody has been recently built. The main objectives of the project included cr ...

139. Development and Calibration of Pyroelectric Radiometer Standards at NIST
Published: Date unknown
Authors: George P Eppeldauer, Jinan Zeng, Leonard M Hanssen
Abstract: The reference spectral power responsivity scale of NIST is being extended from the silicon range to the infrared (IR) using pyroelectric radiometers. Two transfer standard pyroelectric radiometers have been developed at NIST. The main design consider ...

140. Development of a Monochromatic Uniform Source Facility for Calibration of Radiance and Irradiance Detectors from 0.2 um to 12 um
Published: Date unknown
Authors: Keith R Lykke, Ping-Shine Shaw, Leonard M Hanssen, George P Eppeldauer
Abstract: A radiometric source facility is being constructed with narrow-band, widely tunable lasers from {difference} 200nm to 12 um. The output will be highly uniform and monochromatic. This facility will be used to make a wide variety of radiometric measu ...

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