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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I remember a wind measuring device that was fitted to one of the Mars rovers, I think. A length of ribbon perhaps 15cm long was hung by one end in the vertical plane, such that any wind would blow the free end of the ribbon out at an angle from the vertical. Sensors were then used to measure the deflection of the ribbon, and the rate at which the deflection had accelerated, decelerated, reversed, and so on. This device was said to be more robust and less likely to fail in the presence of the many restless 'dust-devil' whirlwinds that flit across the surface of the red planet. I have seen these in the Mojave Desert, and one can't help but be surprised at their strength and violence considering how small they are.
Registered Member #2690
Joined: Sat Feb 20 2010, 04:58AM
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Did you consider using a low power visible LED? That'll avoid some of the IR reflection issues.
Alternative: Paint black and white stripes on the rotating shaft and use ambient illumination with a photometer circuit. Run two such that one is seeing black and the other sees white, take the difference and you get twice the signal and probably some noise elimination. Caveat being it depends on ambient light.
Alternatively, use a very low power LED to provide the local illumination.
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Anemometer sensor types
