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Christopher J Crowley (Fed)

Physicist

Dr. Christopher Crowley is a physicist at the National Institute of Standards and Technology (NIST) where he is dedicated to advancing the frontiers of measurement science. As a member of the Fluid Metrology Group within the Sensor Science Division, Dr. Crowley develops innovative techniques for characterizing fluid flow and properties. His work encompasses a wide range of approaches, from image-based analysis to acoustics to laser velocimetry.

Dr. Crowley is driven by a passion for making these measurements more robust, accurate, and cost-effective. He is currently exploring the use of acoustics to measure fluid flow and is improving optical techniques for understanding complex flow patterns. His expertise in algorithm development plays a crucial role in ensuring the Sensor Science Division continues to make groundbreaking advancements in measurement technology.

Selected Publications

The Effect of Turbulence on a Multi-Hole Pitot Calibration

Author(s)
Christopher J. Crowley, Iosif I. Shinder, Michael R. Moldover
Abstract- Accurate calibrations of multi-hole Pitot tubes require thousands of measurements spanning ranges of the fluid’s velocity, and the pitch and yaw

Improved NIST Airspeed Calibration Facility

Author(s)
Iosif I. Shinder, J. M. Hall, Michael R. Moldover
The National Institute of Standards and Technology (NIST) uses a laser Doppler anemometer (LDA) as a working standard for airspeed calibrations in the range 0

NIST's Fully Dynamic Gravimetric Liquid Flowmeter Standard.

Author(s)
Jodie G. Pope, Aaron N. Johnson, Bernard J. Filla, Joey T. Boyd, Vern E. Bean, Christopher J. Crowley
We describe a new dynamic, gravimetric, liquid flow standard (LFS) that determines flow by measuring the rate of change of the liquid mass accumulating in a

Calibrations of Multi-Hole Pitot Tubes Depend on Tubulence

Author(s)
Iosif I. Shinder, Christopher J. Crowley, Michael R. Moldover
NIST is developing techniques to calibrate 2- and 3-dimensional anemometer systems (such as multi-hole pitot tubes) with a resolution of 0.3 %. The pitch and

Design and Capabilities of NISTs Scale-Model Smokestack Simulator (SMSS)

Author(s)
Aaron N. Johnson, Joey T. Boyd, Eric Harman, Mohammad M. Khalil, Jacob E. Ricker, Christopher J. Crowley, Rodney A. Bryant, Iosif I. Shinder
The amount of CO 2 emitted from a coal-fired power plant (CFPP) is measured by continuous emissions monitoring systems (CEMS) permanently installed in the

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
Created June 22, 2023, Updated February 26, 2025