Is there a radiation spectrum that could be used near the surface of the earth to fluoresce air enough to see the currents? Is there a complimentary CCD that can image that spectrum?

I am looking for a way to detect the wind direction and speed below 50m, does any physics guru have any ideas?

I know scintillation has worked above 250m but if there is another way that would be useful.

  • $\begingroup$ There are plenty of things that would work... but why did you have to pick one with the least chances of success, instead of asking "What would you do to measure wind speed below 50m?". $\endgroup$ – CuriousOne May 10 '15 at 5:23
  • $\begingroup$ Ok how's that? Do you have a suggestion? $\endgroup$ – daemondave May 10 '15 at 11:41
  • $\begingroup$ Yes, I do have a few suggestions. The first one is that you describe properly what you really want to do. $\endgroup$ – CuriousOne May 10 '15 at 12:51
  • $\begingroup$ Detect the motion of air above my head. In sunlight. During the day. $\endgroup$ – daemondave May 10 '15 at 17:31
  • $\begingroup$ Here are the three ideas I came up with: $\endgroup$ – daemondave May 10 '15 at 17:37

Laser Doppler velocimetry can be used. Generally it is used to measure velocity of this range for any transparent fluid flow.

  • $\begingroup$ What happens if there are no particulates to back scatter from? $\endgroup$ – daemondave May 21 '15 at 19:07
  • $\begingroup$ Or, would natural dust in the air be detectable? $\endgroup$ – daemondave May 21 '15 at 19:08

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