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Search Publications by: Christopher J Crowley (Fed)

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Displaying 1 - 4 of 4

Bilateral Airspeed Comparison (2-20 m/s) Using Three Transfer Standards

May 20, 2026
Author(s)
Christopher Crowley, Iosif Shinder, Joey Boyd, Fabio Costa, Samuel Araujo
A bilateral comparison of airspeed standards between NIST and Inmetro was carried out over the range 2 m/s to 20 m/s using three transfer standards: a Pitot tube, a 3D ultrasonic anemometer, and a laser Doppler anemometer (LDA). The instruments were

Ultra-low-speed anemometer calibrations in a bench-top wind tunnel

May 20, 2026
Author(s)
Christopher Crowley, Jeyadave Kumar, Iosif Shinder
Accurate calibration of anemometers at ultra-low airspeeds (i.e. speeds below 1 m/s) is essential for applications such as indoor airflow measurement, cleanroom monitoring, and environmental sensing. To address this need, the National Institute of

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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