Hot-wire anemometer calibration

A hot-wire anemometer measures the flow speed by a small probe inserted in the flow. The sensitive element of the probe is a small wire about 1 mm wide and a few thousands of an inch thick that is heated at a constant temperature of about 200 Celsius. The temperature difference between the wire and the flow dissipates the heat from the wire at a rate that varies with the square root of the flow speed. This makes the hot-wire anemometer able to operate at lower speed than a Pitot anemometer.
DEISA hot-wire calibrator test section.
DEISA hot-wire calibrator test section.

Hot-wire probes require calibration either after repair or as part of the standard metrological practice for providing traceable measurements in engineering. The hot-wire calibration station at the Department of Engineering, University of Leicester, provides a standard calibration service for single-filament hot-wire anemometers using a DEISA calibration system, which is a miniature open-circuit closed-section wind tunnel.

Hot-wire anemometer calibration station
Hot-wire anemometer calibration station

Second year undergraduate students are trained in calibrating hot-wire anemometers in a dedicated second-year experiment that uses this equipment with either straight hot-wire probes, boundary layer probes, or 45 degrees slanted probes.

The hot-wire calibration station is available to perform the calibration of third-party single-filament hot-wire probes. The equipment can calibrate single wire probes with a straight filament, boundary layer probes, and slanted wire probes. For rates and terms of services, please email engineering@leicester.ac.uk.

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