Topic: Piezo anemometer

[DanS]

SLOweather and his flycup anne idea got me to thinking of another different approach and wonder if anybody has tried it. It would use a piezo chip that gets squeezed from wind pressure. Mount the whole thing on a vane to track with wind direction.https://en.wikipedia.org/wiki/Piezoelectric_sensor [ You are not allowed to view attachments ]

[vreihen]

How about a tall pole with 4 force sense resistors (FSRs) in a 90-degree N/E/S/W diamond pattern on the ground?  Zero moving parts, and you can calculate both wind speed and direction from the stress on each FSR.....

[mcrossley]

I did see a similar design once that used four (or two at right angles, i can't recall exactly) piezoelectric sensors that just used an upright rod. From that you can determine both wind strength and direction.

Turbulence around a cylindrical rod may be an issue causing rapid fluctuations in the readings?

[Cutty Sark Sailor]

https://www.google.com/search?q=pitot+tube+anemometer&rls=com.microsoft:en-US:IE-Address&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiyzYDN-4vOAhVF6iYKHaooByIQsAQIQg&biw=1432&bih=833


https://www.google.com/search?q=piezo+anemometer&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi4yKeq_YvOAhVHTSYKHQl6ArsQ_AUICSgC&biw=999&bih=930

[miraculon]

I did see a similar design once that used four (or two at right angles, i can't recall exactly) piezoelectric sensors that just used an upright rod. From that you can determine both wind strength and direction.

Turbulence around a cylindrical rod may be an issue causing rapid fluctuations in the readings?

Absolutely, see this post (about the Davis rain gauge). http://www.wxforum.net/index.php?topic=26463.msg255276#msg255276



How much this would affect the piezo output is anyone's guess.

Greg H.

[Garth Bock]

What about freezing rain, rain drop accumulation, or snow build up ? That would interfere with it as well.

[mcrossley]

You need a hot stick!