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Search Publications by: Christopher J Crowley (Fed)

Displaying 1 - 2 of 2

Accurate Volume Determination for Low Gas Flow Standards

March 17, 2026

Author(s)

Jodie Pope, Christopher Crowley, Max Low, John Wright, Aaron Johnson

The National Institute of Standards and Technology (NIST) has developed the Semiconductor Low Flow Standard (SLowFlowS), a new rate-of-rise (RoR) gas flow standard capable of measuring flows as low as 0.01 standard cm³/min. SLowFlowS incorporates two

Calibrating laser Doppler anemometers utilizing an optical chopper

January 31, 2025

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; however, it is impractical to trace the LDA-determined velocities to the SI by characterizing

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