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Displaying 176 - 200 of 351

Spectral Responsivity Determination of a Transfer-Standard Pyroelectric Radiometer

December 1, 2002
Author(s)
George P. Eppeldauer, J Racz, Leonard M. Hanssen
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 3

Low Scatter Optical System for Emittance and Temperature Measurements

October 1, 2002
Author(s)
Sergey Mekhontsev, Leonard M. Hanssen
The development and evaluation of an optical system for a new spectral directional emittance facility at NIST is reported. The imaging quality and signal contributions due to out-of-field-of-view scattering, commonly characterizedby the size-of-source

Numerical Modeling of an Integrating Sphere Radiation Source

August 1, 2002
Author(s)
A Prokhorov, Leonard Hanssen
Integrating spheres are often used as calibration sources providing uniform radiance within solid angle and/or uniform irradiance at a distance. The best performance in such a system can be achieved if one is able to evaluate as well as predict important

Wavenumber Standards for Mid-Infrared Spectrometry

February 1, 2002
Author(s)
Leonard M. Hanssen, C. J. Zhu
Accuracy of the wavenumber scale of spectroscopic instrumentation is fundamentally important for most applications. Most modern Fourier transform spectrophotometers (FTS) incorporate HeNe lasers that are used to set the wavenumber scale for the instrument