Finding a suitable reflector

[woneill]

cowanrg,

Actually, no. The angle of incidence is equal to the angle of reflection for a plane mirror. (see diagram)

Try looking into a plane mirror at a shallow angle, and see if the image you see is from right angles to your angle of vision or not.

Bill.

 

[Piston]

Call me crazy...

While eating dinner the other night, it dawned on me that if I could find a reflector like the salad bowl in front of me, I might have a good reflector.
My wife is great, I just hope she still cookes for me after I steal her salad bowl....Still with me?
Does anyone know what it costs to have glass aluminized, like what astronomers use to build their home reflector telescopes, because that is what I intend to do...what do you think???

I tooled a piece of glass and sanded a hole through it using my dremel, this took me 2 hours for a 1/4 hole. I said no way I'm doing this to fit the mogul socket, so I went to the acetylen torch, and that worked great in 5 minutes.

I played around with what reflection standard green glass has and positioned a standard 100W bulb inside, the focal point seems right for the job.

So the only thing stopping me right now is:

1: How much would this coating cost
2: If my bowl is arcopale, does it still work?
3: If I break the bowl, does the wife divorce me...

<P>

 

[Gunawan W]

woneill,
is this what you mean?

 

[Piston]

Gunawan the image above is also what I have in mind, however, I think that building a mask to the size of LCD would help reduce the difused beam around the lens. Use the mask as you lens mount also.

 

[xblocker]

Salad bowl!? Hmm, hmm..
Any reflecting coating only make sense, if the curvature of that piece has spherical, elliptical or parabolic shape or it won't work!
Reflectors follow to the laws of geometrical optics!

xblocker

 

[woneill]

Hi Gunawan,

That's exactly what I was thinking of!

Now all we need to do is find a way to levitate the lens into the right position... 😉

Bill.

 

[insolace]

i don't know if anyone has posted this or not, but i found a neat site for reflectors that may be of use. it has a chart listing it's sizes and focal points etc, but it also looks like they might do a custom job.

http://www.carleylamps.com/reflectors.htm#Aluminum Reflectors

-eryk

 

[tahustvedt]

I don't know if it's useful to you guys but I couldn't find any mention of this here so just in case...

Have you guys considered car headlight reflectors? There are quite a few different shapes and sizes to choose from. 🙂

Also, to make the insode of a bowl reflective you could use chrome spraypaint. It's quite reflective (hey, it's chrome).




Tor Arne

 

[Piston]

FYI basics on reflectors

http://ourworld.compuserve.com/homepages/awi_industries/Optic_reflectors.htm

and her for excel macros for reflector design:

http://www.opticalres.com/macros/LT_Macros/ltmacroindex.html

 

[gwark]

i appreciate the how small this builder's reflector setup is.

take a look

(google translated link - IE)

http://216.239.37.104/translate_c?h...ox.com/borazy/borazy.htm&prev=/language_tools

what do you guys reckon?

 

[ace3000_1]

Hey ya i got one of those lol they work well.

Trev🙂