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Article #21888Re: hot wire anemometers
From: Jon Zeeff
Date: Wed, 27 Dec 1989 14:30
Date: Wed, 27 Dec 1989 14:30
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>> "hotwire anemometer" to measure windspeed across a aircraft > >The idea is exceedingly simple: you run a current through a wire, enough >to heat it up, and measure its temperature (e.g. by using a wire whose >resistance changes in a known way with temperature). The stronger the >air currents over the wire, the better the cooling and the lower the >temperature will be. Of course, you have to compensate for variations in >air temperature. In principle it's a trivial device, although I'd imagine When I did on-board microprocessor programming for Ford, we used one to measure air flow into the engine. It was particularily nice because it measures the mass of the air (ie, denser air cools it more. Denser is not necessarily = cooler). -- Jon Zeeff zeeff@b-tech.ann-arbor.mi.us or b-tech!zeeff
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!umich!itivax!b-tech!zeeff From: zeeff@b-tech.ann-arbor.mi.us (Jon Zeeff) Newsgroups: sci.electronics Subject: Re: hot wire anemometers Message-ID: <_SC=7+@b-tech.uucp> Date: 27 Dec 89 14:30:45 GMT References: <5653@orca.wv.tek.com> <1989Dec15.172519.22348@utzoo.uucp> Reply-To: zeeff@b-tech.ann-arbor.mi.us (Jon Zeeff) Organization: Branch Technology, Ann Arbor, MI Lines: 16