Journal of Research of the National Institute of Standards and Technology articles from May 2004

Journal of Research of the National Institute of Standards and Technology archives from May 2004

Uncertainty propagation for NIST visible spectral standards.
May 1, 2004... Uncertainties in the NIST spectral standards for detectors and sources in the visible wavelength range are propagated from the high accuracy cryogenic radiometer measurements, taking correlations into account at every stage. Partial...

Uncertainties in small-angle measurement systems used to calibrate angle artifacts.
May 1, 2004... We have studied a number of effects that can give rise to errors in small-angle measurement systems when they are used to calibrate artifacts such as optical polygons. Of these sources of uncertainty, the most difficult to quantify are errors...

Embedded microheating elements in polymeric micro channels for temperature control and fluid flow sensing.
May 1, 2004... This paper describes the first demonstration of temperature control and flow sensing of fluids using integrated circuit (IC)-based microheating elements embedded in microchannels molded in polydimethylsiloxane (PDMS). Fluid channels and...

Uncertainty and traceability for the CEESI Iowa natural gas facility.
May 1, 2004... This paper analyzes the uncertainty of a secondary flow measurement facility that calibrates a significant fraction of United States and foreign flow meters used for custody transfer of natural gas. The facility, owned by the Colorado...

High-resolution observations of the infrared spectrum of neutral neon.
May 1, 2004... We have observed the spectrum of neutral neon (Ne I) emitted by a microwave-excited electrodeless discharge lamp with the National Institute of Standards and Technology 2 m Fourier transform spectrometer. The spectra cover the regions 6929...