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Metrology

Flow metrology & rheology

News and Updates

schematic of sound-wave transmitter and receiver

Sounding Out a New Way to Measure Gas Flow

Researchers at NIST have developed a new — and sound — way to accurately measure the rate at which gas flows in and out of a vessel. The technique, which uses

Events

Projects and Programs

acoustic resonator

Acoustic Techniques in Fluid Metrology

Ongoing
We use acoustic techniques in gases to measure the thermodynamic temperature of a gas in a spherical or cylindrical cavity, the optical absorption in gases and aerosols (in collaboration with NIST’s Chemical Sciences Division) the quantity of gas in a large vessel or tank, and gas flow into/from a
Optofluidic device

Dynamic Nanoflow Metrology

Ongoing
Ultra-precise and dynamic flow measurements are needed for high-throughput biological studies and for dynamic control of chemical delivery systems in medical and biotechnology applications. In addition, existing analytical methods, such as analytical high-performance liquid chromatography (HPLC) and
two-capillary viscometer

Gas properties for flow metering

Ongoing
NIST has two on-line databases that include accurate gas viscosity values: SEMIPROP - NIST Standard Reference Database 134 - for selected semiconductor process gases NIST Chemistry WebBook - for heat transfer fluids, components of air, components of natural gas [Note: as of February 2014, the NIST

Material Qualification

Ongoing
Objective To develop, utilize, and analyze methods of characterizing the precursor materials in additive manufacturing in both virgin and recycled states with the goal of advancing measurement science to benefit the AM community. The components of principal interest will include the rheological

Publications

Calibrating laser Doppler anemometers utilizing an optical chopper

Author(s)
Christopher Crowley, Iosif Isaakovich Shinder, Michael R. Moldover, Joey Boyd, James Filla, Aaron Johnson
Laser Doppler anemometers (LDAs) use scattered light to determine velocity components of a flowing fluid. The operating principal of LDAs is simple conceptually

Tools and Instruments

wind tunnel instrument

Wind Tunnel

NIST’s wind tunnel can produce air speeds between 0.15 m/s and 40 m/s. The air speed reference is a Laser Doppler Anemometer (LDA) with an uncertainty of 2.5 %
gas pipeline

Natural Gas Flow Calibration Service

Name(s) of Calibrations/SRMs/SRD/SRIs and any related programs: NIST Special Tests for Natural Gas Flow (18080S) Summary The Fluid Metrology Group (FMG)
gas flow standards thumbnail

Gas Flow Standards

Summary NIST's gas flow meter calibrations support a wide range of industries that require low-uncertainty, SI-traceable measurements. These industries include
15 kg/s liquid flow standard

Liquid Flow Standards

Summary The Fluid Metrology Group has a dynamic, gravimetric liquid flow standard spanning the flow range 0.2 L/s to 15 L/s with uncertainty less than 0.03 % at

Awards

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