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| Joined: | Jun 26th, 2009 |
| Location: | Heart Of Arizona Indian Country, Arizona USA |
| Posts: | 662 |
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On one side of the spectrum I thought you might make use of Radar.
As in a radar gun - sports speed gun. That uses a very narrow beam.
On the other-side of the spectrum....there is the UV LEDs mentioned above.
Laser microphones have been around for a while. Seen lots of video on youtube about them.
Ron
Last edited on Apr 19th, 2011 05:12 AM by ArizonaEvp