Sigurthr
0
- Joined
- Dec 11, 2011
- Messages
- 4,364
- Points
- 83
I'm glad they left the emergency signaling clause in there. That gives us a bit of leeway if we are ever stopped/searched and are carrying a laser. The definition of "flight path" could be a real problem though... a flight path can encompass your entire field of view at a certain elevation angle. What elevation angle you choose for beamviewing could become very important!
Somewhat related... when beamviewing are low elevation angles safe to use? (close to the hoizon) A low takeoff angle may stay clear of any aircrafts in your field of view but what about miles away... due to the curvature of the earth that would shoot the beam across someone else's center sky. At what distance would the beam be too diverged to be detected by an aircraft? With 1mRad divergence at 100 miles out a beam will increase in diameter 160,900mm or 160.9meters. At 10 miles out the same beam would be only 16.09 meters wide (52ft) which is probably not diverged enough. So where does one draw the line.
Shooting directly up at a patch of the sky completely void of illumination (stars or otherwise) would be the safest bet for avoiding direct aircraft exposure, but perhaps not the wisest for avoiding a flight path.
Somewhat related... when beamviewing are low elevation angles safe to use? (close to the hoizon) A low takeoff angle may stay clear of any aircrafts in your field of view but what about miles away... due to the curvature of the earth that would shoot the beam across someone else's center sky. At what distance would the beam be too diverged to be detected by an aircraft? With 1mRad divergence at 100 miles out a beam will increase in diameter 160,900mm or 160.9meters. At 10 miles out the same beam would be only 16.09 meters wide (52ft) which is probably not diverged enough. So where does one draw the line.
Shooting directly up at a patch of the sky completely void of illumination (stars or otherwise) would be the safest bet for avoiding direct aircraft exposure, but perhaps not the wisest for avoiding a flight path.