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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Wed, 17 Jun 1998 19:29:39 GMT
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Original-From:
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Brett Anthony <anthonyb@ecs!IHateSpam!.csus.edu>
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Viewed:
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2062 times
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At 09:19 PM 6/16/98 -0400, you wrote:
> Do you happen to know if those changes are linear? Something like this
> would make a cool replacement for the MAS on the Talon. It uses a series of
> honeycombs (that form little diamond shapes). Then it measures the number
> of spinning vortices coming off the honeycomb (via ultrasound) -it's called
> the Karmen-???? phenomenon. It's also a pretty restrictive piece of the
> intake path.
>
> A cylinder with one of these platinum wires crossing it (along w/the
> extra sensors needed) with a PIC as the glue would really be slick, as long
> as the mapping (or math) to do something useful with it wasn't to hairy.
>
> -Paul
I'll have to check this out. We havn't actually used hot-wire-anemometers
recently, partly because we havn't had the need, and partly because
vortex-shedding flowmeters are all the rage right now. My memory is they
are not linear, but that the curve is second order and easy to handle.
Temperature, density, and heat content of the medium are a big problem, but
if these don't vary much...
They ARE small. And fragile. I replaced one once by crushing a flashlight
bulb, recovering the filament mount and soldering the platinum wire in place
of the filament. Under a microscope. Don't sneeze.
Brett Anthony
Research Technician
School of Engineering and Computer Science
California State University, Sacramento
e-mail: anthonyb@ecs.csus.edu
phone: (916)278-6253
fax: (916)278-5949
address: Brett Anthony
E&CS, CSUS
6000 J St
Sacramento CA 95819-6023
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