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  #1  
Old 02-15-2011, 03:40 PM
Dammi Dammi is offline
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Default Wind Speed Measurements

Hi there guys, awesome site you got here

I've got some homework assignment, and I was wondering what would be the best setup to measure windspeed accuratly.

What method is the best one? Using a brushless DC motor and measuring the voltage it generates or a magnet switch on the blade and measure how often it pulses ?

Or any other method?

Best regards,
Dammi
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Old 02-15-2011, 04:09 PM
someonesdad someonesdad is offline
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There are lots of different methods out there -- I suggest you consult your local technical library. Also do some research about the commercial instruments available and what techniques they use. Look up the word anemometer.
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Old 02-15-2011, 04:20 PM
wayneh wayneh is offline
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Quote:
Originally Posted by someonesdad View Post
Look up the word anemometer.
+1

If you need to build one, the bicycle speedometer approach is probably the easiest. Moving magnet makes a pulse, computer counts pulses and converts to various outputs. Temperature differential is another method that's not too hard but I think it's better at higher speeds (jet airplanes, for instance).

The problem with ALL methods is linearity. You need the speed of rotation to be directly proportional to wind speed. That means good bearings and blade design.
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Old 02-15-2011, 04:32 PM
Dammi Dammi is offline
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Alrighty, thanks for the reply guys
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Old 02-15-2011, 06:25 PM
ahto555 ahto555 is offline
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Have you been thinking about ultrasonic measuring. No moving parts. There are few quite good circuits available in internet.
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Old 02-15-2011, 07:11 PM
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bertus bertus is online now
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Hello,

Did you also think of the thermal anemo meter?
http://www.fonema.se/anemom/anemom.html

Bertus
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Old 02-15-2011, 08:19 PM
Dammi Dammi is offline
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Quote:
Originally Posted by bertus View Post
Hello,

Did you also think of the thermal anemo meter?
http://www.fonema.se/anemom/anemom.html

Bertus
It has to be operational outside, so one would think that rain/snow would be to much of a factor in that case

I think a regular Cup anemometer would be the best choice in my case. After some reading I really "fell in love" with Hot-Wire Anemometer, but again, the rain would propably be a factor. And correct me if I'm wrong, but wouldn't the temperature of the air also affect the measurements, so I would have to take that also into account in the reading :P Too much work I think for this project.

But thanks for all the replys, I'll post a picture of the project when it's finished
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Old 02-15-2011, 08:45 PM
floomdoggle floomdoggle is offline
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Air temp shouldn't make any difference. Also, look up the Easter egg anemometer. Ans check out the Chispito wind generator.
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Old 02-15-2011, 09:29 PM
wayneh wayneh is offline
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Quote:
Originally Posted by Dammi View Post
...wouldn't the temperature of the air also affect the measurements
No, the heated probe approach I mentioned is designed to compensate for ambient, usually by having one probe in the wind and another not exposed. They can also designed to be immune to rain and such.

But I still recommend a mechanical approach, a spinning magnet.
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Old 02-16-2011, 04:38 PM
Dammi Dammi is offline
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Quote:
Originally Posted by wayneh View Post
No, the heated probe approach I mentioned is designed to compensate for ambient, usually by having one probe in the wind and another not exposed. They can also designed to be immune to rain and such.

But I still recommend a mechanical approach, a spinning magnet.
Ahh yes, I found that out (about the thermal anemo meter).

But one question about using a magnet to measure the speed, won't there be alot of disturbance when the wind is very slow ?
(In other words, won't the magnet create noize in the signal when it goes really slowly towards/and over the sensor)

Wouldn't using a light gate be better ? (I get extra points for accuracy)
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