[Laser] Depth of modulation for various lamp types

[Kerry Banke]

Yves - As always, thanks for your good ideas. I will look at this approach.
  - Kerry N6IZW -

At 11:48 AM 9/11/2006, you wrote:
>
>Kerry
>Infrared  gives a better air transparency than the sodium yellow orange
>light.
>So very  under-powered classic thermal lamps could also work with a good
>modulation.
>Try  to mount a few lamps in serial mode so the lamps are just visible  red.
>At  this temperature the modulation depth could be better and the most of
>radiant  power in the infrared spectrum.
>A  very low cost infrared filter (colour slides developed without to be
>exposed)  could then reject all the other sodium light from the city  lights.
>73 Yves  F1AVY
>
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