
Syllabus

Introduction 2 min

HotWire Anemometry 3 min

Solid State Thermal Impedance Method 4 min
 Demo

Setup 3 min

Air Speed Measuring 1 min

Results 3 min

Conclusions 6 min
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Air Speed Sensing Using SolidState Thermal Impedance
This course shows you how to measure air speed using solidstate thermal impedance techniques
In this course you will learn how to measure air speed using solidstate thermal impedance techniques. Our methodology uses a heated transistor, a closely coupled thermal sensor measuring the heat generated, and a solidstate air temperature reference sensor to sense and compute the air speed or flow rate.
Air flow is computed using forced convection heat transfer principles over a flat plate using Newton’s law of cooling. In this law is used, the Nusselt number, that accounts for the heat transfer coefficient and the Prandtl number, which accounts for the velocity and thermal boundary interactions. Measurement is limited to laminar flow and a flat plate type detector/sensor.
This relatively inexpensive way to measure air velocity can be calibrated to fit a variety of applications. The class will illustrate the experiments, elaborate on the results, and compare them with a hotwire anemometer.