Where the light shines: simple DE projectors

[sportyaccordy]

Nice work man good stuff

[satrya]

Nice work man good stuff

Thanks.
I guess with the gap caused by bulb opening, it looks almost like 2 pencil beams on the road. Maybe one can use a large enough bowl mounted at the center of the grille opening like a cyclops, but still have the output at a distance to look like 2 separate beams.

[satrya]

Wall shots, at further distance ranges, still no lens

Since the "wall shot time-lapse" pictures 3 post up suggest that the beam pattern hasn't really stabilized, I looked at how the wall shots look at that further range.

As before, it's worth looking at the separate contributions (of the non-reflected rays and rays reflected by the bowl). I should note that the intensity level on the plots are not linear (as can be seen from the colorbar to the right of each plot). Rather, they are in log scale (pretty much like the Richter scale for describing earthquakes; a Magnitude 3.0 is 10 times bigger than a 2.0, etc.). Otherwise, I ran into problems making the plot look meaningful (since most of them appear dark). I suspect this is ok, since our eyes probably work in a similar scale (or maybe something very nonlinear that does that curves like that at the high end).

This is the non-reflected ray only. By 250ft, the rays on a 100ft tall "wall" are almost parallel to each other, as indicated by the vertical gradient. This should be as expected.


The reflected ray, in contrast, retain that higher concentration around the middle (save the gap due to the bulb opening).


And here is the combined output:


Note that the colormap auto adjusts for each plot; otherwise some of them would lose the details.

As a reminder, here is how the first 15 ft of "time lapse" (or should I say distance lapse) plot:

[sportyaccordy]

Thanks.
I guess with the gap caused by bulb opening, it looks almost like 2 pencil beams on the road. Maybe one can use a large enough bowl mounted at the center of the grille opening like a cyclops, but still have the output at a distance to look like 2 separate beams.

In 3D, it's two diverging beams that are actually very far apart. When I played with my D2S in my room, it was about a 2ft hole at ~10 ft away. On the road that is pretty much your distance lighting. So the lens is critical to a useful output.

[satrya]

In 3D, it's two diverging beams that are actually very far apart. When I played with my D2S in my room, it was about a 2ft hole at ~10 ft away. On the road that is pretty much your distance lighting. So the lens is critical to a useful output.

Yes, I was just kidding. Otherwise, no one would bother to put those heavy glass lenses.
The 2nd picture in post #48 show how wide apart they are. 2 ft hole at about 10 ft away is consistent with the 2nd picture in post #45; my virtual 2D bowl might have a lot of similarities with a Mini D2S then.

[gold94corolla]

You started adding copyright text? Might wanna do that on all of them if you think it's worth it to start adding them

And I might go back and clean up the thread when you're finished posting, so that all of your information is together.

[satrya]

I added the copyright, but I don't feel strongly about it. I'm ok with anyone using it as long as they don't take credit for it. Even then, it has happened to me before.

As for cleaning up the thread, I may have to do that. I'd like to get a nice table of contents of sorts. For now, there's a lot of exploring to do.

[Genes1s]

Good Thread Satrya, you communicate technical term in simple ways.

Understanding the physics of the optic is a must, but you could get a demo or low end rays trace program onlime and build your model in CAD that way you can iterate the design quickly. I've always wanting do this for awhile now, but didn't have time, so it's awesome to see someone else who has interest in this. I'm not surprise that we only utilize 20-30% of the total rays. Mirror like reflector is very expensive and the cost isn't linear compared to performance.

Keep it coming!

[satrya]

^
Thank you. I'll update this thread whenever I can.

[GSD07]

You are a genius, is only matter of time before we see the Satrya 3" Projector

[satrya]

You are a genius, is only matter of time before we see the Satrya 3" Projector

Kind words. Thank you.

The fact is I am a non industry insider, and there are a lot of known unknowns from my perspective that makes a good projector. I'm just trying to better understand the basics here.

[MDJammin]

Better understanding focal points, shapes and distances will certainly help people confirm beforehand what hybrid of parts might work better or worse. That could be a huge help in tough projects when there is NO simple answer to fit. At least from what I've read thus far. A plug n play type part finder could possibly come of this code you are writing.......I have Xspecs on the lens holder - I could use Y reflector bowl with Z lens and get a certain output quality.