Batsignal?

[cod4pwns08]

SO ya I was wondering if there is something I can do to project a batsignal on a cloud? thats VERY bright.

 

[bloompyle]

I could tell you how, but how bright it is I couldn't say. Put a close focal point lens in front of it (for instance a jewler's loupe) that makes the beam expand rather quickly, then at a distance where the beam is large enough to 'fill in' an entire batsignal shape, shine it on it. There you go, kinda like a light. Sounds like it'd work, but I recommend using a 100mW+ green laser for it, as the visibility would be quite high. Good luck (these are only my thoughts, I might be wrong)

 

[Trevor]

Given a high-power laser (preferably green for visiblity) and a scanner, I'd say this is well-within the realm of possibility. I wouldn't recommend it though. Aircraft, laser display regulations, people flipping out due to a Batman signal... a lot of things can go wrong.

-Trevor

 

[Grix]

Given a high-power laser (preferably green for visiblity) and a scanner, I'd say this is well-within the realm of possibility. I wouldn't recommend it though. Aircraft, laser display regulations, people flipping out due to a Batman signal... a lot of things can go wrong.

-Trevor

This. It's possible, but highly illegal.

 

[HIMNL9]

..... people flipping out due to a Batman signal .....

Why ? ..... what's strange in seeing a Batman signal on a cloud ? .....

j/k :eg: :crackup:

Oh, BTW, for Batman fans, there are also batsignal projectors already made ..... both "main power lamp types" and USB

EDIT: or the real size one, perhaps

 

[ElektroFreak]

To have a "very bright" image you'll need low clouds and at least 15-20W (yes that WATTS) of green.

 

[Benm]

You'd also need a fairly flat cloud layer at low altitude to project it onto. This is more difficult to do than you might think. For example, its rarely possible to project a visible dot onto the coulds even using a few 100 mW of green. You might be able to see a vague reflection from the clouds or a diffusing beam, but that's hardly useful for projecting a recognizeable image.

I'd say its plausible with either a scanner or some kind of optical cut-out like in the picture above, but only with very specific weather conditions: a low, thick and even clouddeck. The chance of hitting aircraft would probably be limited - i suppose the clouds would have to be so thick and low they'd rather divert to another airfield.

 

[randomlugia]

I've never been able to see my 125mW laser spot on a cloud. The easiest way to do this would be to just use/rent a spotlight, like the ones that wave around outside of theaters.

 

[Tech_Junkie]

I've seen my old ~200mW Blu-Ray on low flying clouds at the beach. It was faint, and miss-shaped, but you could see it.

 

[chipdouglas]

i can usually see my 90mw green on clouds.. if you don't know what to look for you will miss it.. i sweep the open sky, then go on to the cloud.. then i can see the brighter spot at the end on the cloud.

michael.

 

[randomlugia]

That's weird, I've tried that. Maybe we just have a low elevation or something...

 

[chipdouglas]

my elevation is about 1000 feet.

 

[iwannapony]

white light would just scatter, you would need a super bright LED buld, or large metal-halide rooftop spotlight. or the light on top of the pyramid in las vegas.

 

[randomlugia]

??????
:wtf:

If you don't know what you are talking about just don't say anything.

I think he does, actually. Ever seen an SST-90 with an aspheric lens? You can light up the entire side of 20 story building.

 

[KGB_Productions]

now just put that building another mile away and see what it looks like.

There are some pretty good videos on youtube of laser cloud writing. I just cant seem to find them now

 

[iwannapony]

LED tech has become ridiculously bright, and with producing little or no heat they can be used for almost any purpose. more recently newer football stadium lighting.