Front projection into water-screen ???

[pelosh]

Hey people,

could this work..?!

I know it works from back to front, but now I'm facing question from customer, whether it works the other way.

Any ideas?

[allthatwhichis]

Send me a water screen set up and I will try it out and tell you how it works.

I see no reason why it wouldn't work; it is still reflecting the show you are projecting like a scrim does.

[Laser Ben]

I would be worried about reflections

[fuzcub]

You'll want to test this before telling your customer it's possible.
I've done a waterscreen show with different projections onto both sides of the screen with almost no crosstalk between the two sides.
My guess is that when the laser strikes each water dropplet the path of the beam diffracts maybe +-25 deg. and continues out the other side of the water screen.
Maybe if you added some white pigment to the water it might work better? B.

[mliptack]

It depends on the shape of the water droplet when it sprays out of the nozzle.

Since its fairly similar to a lawn sprinkler, I'd say a small scale test was in order.

Personally, my hypothesis is that it would be fairly week compared to looking at it from the back. I'd imagine the majority of light would scatter only a few degrees off axis. (probably +/-15 degrees depending on the shape of the water droplet). With minimal losses from back scatter..

[Doc]

It depends on the shape of the water droplet when it sprays out of the nozzle.

Since its fairly similar to a lawn sprinkler, I'd say a small scale test was in order.

Personally, my hypothesis is that it would be fairly week compared to looking at it from the back. I'd imagine the majority of light would scatter only a few degrees off axis. (probably +/-15 degrees depending on the shape of the water droplet). With minimal losses from back scatter..

The main back reflection should be circa 0 to 40 ish degrees from the beam axis (in theory)

[Doc]

Make that 42°

[laseralex]

Hey people,

could this work..?!

I know it works from back to front, but now I'm facing question from customer, whether it works the other way.

Any ideas?

It's possible, but certainly not easy. Here's a waterscreen we front-project on:



This projector and the one we built for the Grand Coulee Dam are the two most powerful RGB laser projectors ever built, each making over 80W of RGB when new. Yet even with this power we had to go to great lengths to make the show look good. (Note all the people standing on the bridge - it gives you an idea of the size of the screen.)

My recommendation: if you're bidding on a job, team up with someone who has done this before. You'll save yourself from a world of hurt.

[sugeek]

It's possible, but certainly not easy. Here's a waterscreen we front-project on:



This projector and the one we built for the Grand Coulee Dam are the two most powerful RGB laser projectors ever built, each making over 80W of RGB when new. Yet even with this power we had to go to great lengths to make the show look good. (Note all the people standing on the bridge - it gives you an idea of the size of the screen.)

My recommendation: if you're bidding on a job, team up with someone who has done this before. You'll save yourself from a world of hurt.

Alex,

I have seen the Grand Coulee show before is it still the 4 ion lasers (2 Argon, 2 Krypton) both eight feet long and running at 55W rather than the maximum 85W. I really enjoyed the show the purples were amazing (still daylight when I watched it) I am talking about the butterfly. The flood gates opening on the dam, then the laser show starting was awesome (I did get in the projection booth before it started, and talked the guys head off). The only complaint I got from him was they were tired of the same show after 11 years (which should date when I saw the show last).

-Adam

[mliptack]

Alex, that is stunning! Got any pictures of the laser itself?