Subject:
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RE: Cheap air flow sensor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 16 Jun 1998 21:52:28 GMT
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Original-From:
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Paul Mrozowski <MROZOWSKI@GLIS.stopspamNET>
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Viewed:
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3375 times
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At 07:41 AM 6/16/98 -0700, you wrote:
> The classic small air flow sensor is a hot-wire-anemometer. Just position a
> short piece of very fine wire in the airflow and normal to it, run a
> constant current thru it, and measure the voltage change due to the cooling
> effect of the airflow. Works great. Unfortunately, the sensing wire is
> ordinarily platinum (!) due to it's desireable resistivity/temperature
> characteristics and relative inertness, however, cheaper wire may work. It
> must be VERY fine wire, however.
Interesting. But wouldn't the air temperature change the readings? Or
would you also use a temp. sensor and adjust your table scaling to take
this into account? What about air pressure, same thing?
-Paul
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