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Search Publications

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  • Published Date
Displaying 26 - 50 of 332

Faster, More Accurate, Stack-Flow Measurements

February 25, 2020
Author(s)
Aaron N. Johnson, Iosif I. Shinder, Bernard J. Filla, Joey T. Boyd, Rodney A. Bryant, Michael R. Moldover, Thomaa D. Martz, Matthew Gentry
Exhaust flows from coal-fired electricity-generating-plants are determined by measuring the flue gas velocity at prescribed points in the stack cross section. These velocity measurements are made using EPA-approved differential pressure probes such as the

Optimal Series Resistors for On-Wafer Calibrations

November 8, 2019
Author(s)
Jasper A. Drisko, Richard A. Chamberlin, James C. Booth, Nathan D. Orloff, Christian J. Long
The series resistor is a common on-wafer device typically used in the series-resistor calibration and for estimating the capacitance per unit length of coplanar waveguide transmission lines. While much work has been done using series resistors, this paper

Progress Towards a Gas-Flow Standard using Microwave and Acoustic Resonances

July 15, 2019
Author(s)
Jodie Gail Pope, Keith A. Gillis, Michael R. Moldover, Eric Harman, James Mehl
We describe our progress in the development of a novel gas flow standard using the acoustic and microwave resonances of a 1.85 m3, nearly-spherical, steel vessel at pressures up to 7 MPa. For flow calibrations using pressure and acoustic frequency

NISTIR 7383, Selected Procedures for Volumetric Calibrations (2019 Ed)

May 14, 2019
Author(s)
Georgia L. Harris, Val R. Miller
This publication contains Good Measurement Procedures (GMP), Good Laboratory Procedures (GLP), and Standard Operating Procedures (SOP) for use in calibration laboratories performing volumetric calibrations. It includes procedures for Volume Transfer and

Impedance tuning with photoconductors to 40 GHz

January 22, 2019
Author(s)
Jasper A. Drisko, Ari D. Feldman, Franklyn J. Quinlan, James C. Booth, Nathan D. Orloff, Christian J. Long
Light has been widely used to control a variety of microwave devices, including switches, antennas, and detectors. Here, we present a photoconductive device integrated into a coplanar waveguide to tune complex impedances at microwave frequencies with

NIST Handbook 150-8, NVLAP Acoustical Testing Services

November 19, 2018
Author(s)
Kari K. Harper
NIST Handbook 150-8 presents technical requirements and guidance for the accreditation of laboratories under the National Voluntary Laboratory Accreditation Program (NVLAP) Acoustical Testing Services program. It is intended for information and use by

Measurement and Modeling of Heterogeneous Chip-Scale Interconnections

October 22, 2018
Author(s)
Richard A. Chamberlin, Dylan F. Williams
We present precision scattering-parameter measurements of chip-to-chip connections in heterogeneous integrated circuits: indium phosphide or gallium nitride “chiplets” mounted on SiCMOS carrier chips. We demonstrate methodology, experimental results, and

Epitaxial graphene for quantum resistance metrology

July 20, 2018
Author(s)
Mattias Kruskopf, Randolph Elmquist
A new generation of graphene-based quantum Hall resistance standards promises high precision for the unit ohm under relaxed measurement conditions, enabling the use of compact measurement systems. To meet the requirements of metrological applications

NIST Measurement Services: Photometric Calibrations

July 10, 2018
Author(s)
Carl C. Miller, Maria E. Nadal, Benjamin K. Tsai, Yuqin Zong
The National Institute of Standards and Technology provides calibration services for submitted artifacts for luminous intensity, illuminance, color temperature, total luminous flux, luminous exposure and luminance. Additionally, the National Institute of

Measurements of scatter peaks in 137Cs and 60Co sources

June 28, 2018
Author(s)
Leticia S. Pibida
The results of the testing of radiation detection instruments with radionuclide identification capabilities will depended on the sources used for the tests. High resolution spectra need to be acquired to determine all the observable peaks in the source

Characterization of Five-Hole Probes used for Flow Measurement in Stack Emission Testing

May 16, 2018
Author(s)
Iosif Isaakovich Shinder, Aaron Johnson, Michael R. Moldover, James Filla, Vladimir Khromchenko
We report progress towards the goal of reducing the errors in industrial smokestack flow measurements to 1 % by replacing S-probes with calibrated 3-D probes (i.e., probes that measure 3 components of velocity). NIST calibrated a commercially-manufactured

Errors in Rate of Rise Gas Flow Measurements from Flow Work

March 20, 2018
Author(s)
John D. Wright, Aaron Johnson, Gina Kline, Michael R. Moldover
The rate of rise (RoR) method measures the time rate of change of the mass of gas in a collection volume as it is filled via a flow meter under test. The mass of gas is calculated from time-stamped pressure and temperature data gathered from the known

G-band Reflectivity Results of Conical Blackbody for Radiometer Calibration

January 14, 2018
Author(s)
Derek A. Houtz, Dazhen Gu
Two hollow conical cavities have been developed and built for the National Institute of Standards and Technology (NIST) for use as radiometric brightness temperature sources, or blackbodies. According to Kirchoff's reciprocity relation, a good absorber is

Correction of an adding-doubling inversion algorithm for the measurement of the optical parameters of turbid media

January 1, 2018
Author(s)
Paul Lemaillet, Catherine C. Cooksey, Jeeseong Hwang, Heidrun Wabnitz, Dirk Grosenick, Lin Yang, David W. Allen
We present broadband measurements of the optical properties of tissue-mimicking solid phantoms using a single integrating sphere to measure the hemispherical reflectance and transmittance under a direct illumination at the normal incident angle. These

Performance evolution of TLD-700H/600H dosimetry system at extended issue periods

December 15, 2017
Author(s)
Alexander A. Romanyukha, Matthew Grypp, F. Trompier, Alan Keith Thompson, Ronaldo Minniti, Jacque Debroas, Anthony S. Williams
Results of a comprehensive study of the TLD-700H/600H dosimetry system performance for an extended issue period are presented and discussed. It was concluded that the obtained results provide a technical justification to use the current dosimetry system at

Geometric contributions to chopper wheel optical attenuation uncertainty

December 9, 2017
Author(s)
Matthew T. Spidell, Joshua A. Hadler, Michelle S. Stephens, John H. Lehman, Paul A. Williams
Calibrated reflective optical choppers are used in NIST’s high power laser calibration services due to their advantages in performance and safety over wedges and semi-transparent materials for beam power reduction. While the design, operation, and

Hybrid Characterization of Nanolitre Dielectric Fluids in a Single Microfluidic Channel up to 110 GHz Song

December 1, 2017
Author(s)
Nathan D. Orloff, Song Liu, James C. Booth, Dylan F. Williams, Dominec Schreurs, Bart Nauwelaers, Iija Oclet, Charles A. Little
In this work, we present a new “hybrid” method for dielectric measurements of nanolitre fluid samples on-wafer. The first part of the hybrid method is a technique which extracts the 4 complex permittivity of the microfluidic channel wall material. The

On-site multi-kilowatt laser power meter calibration using radiation pressure

December 1, 2017
Author(s)
Paul A. Williams, Joshua A. Hadler, Brian J. Simonds, John H. Lehman
We have demonstrated the calibration of a thermal power meter against a radiation-pressure power meter in the range of 20 kW in a manufacturing test environment. The results were compared to a traditional calorimeter-based laboratory calibration undertaken

Establishing Traceability for SOLT Calibration Kits*

November 28, 2017
Author(s)
Ronald A. Ginley
Establishing traceability for a measurement is very important so that the results of the measurement can be used in a common framework for comparisons and understanding. The standard source of traceability for Short-Open-Load-Thru (SOLT) calibrations has
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