Stretched membrane mirror test

Here is my second test. This time it's a 14" diameter flower pot tray with metallized film stretched over it. I added an air hose spigot and sucked a little air out of of the chamber behind the film. It works!

The flower pot tray is a little flimsy so it tends to loose the circular shape when the film starts pulling at it, but the principle appears sound so I'll be looking for larger forms to use. The goal is to go to a 1m diameter mirror, with better film, which I have waiting for the larger form.

I'll try burning something with the mirror tomorrow!

Here's a picture.

I_F
 

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soongsc

Member
2005-03-26 2:31 pm
Taiwan
I_Forgot said:
Here is my second test. This time it's a 14" diameter flower pot tray with metallized film stretched over it. I added an air hose spigot and sucked a little air out of of the chamber behind the film. It works!

The flower pot tray is a little flimsy so it tends to loose the circular shape when the film starts pulling at it, but the principle appears sound so I'll be looking for larger forms to use. The goal is to go to a 1m diameter mirror, with better film, which I have waiting for the larger form.

I'll try burning something with the mirror tomorrow!

Here's a picture.

I_F

If that only going to be a mirror?
 
Yes, just a mirror, but there are some amazing things that can be done with large concave mirrors. Stereoscopic display systems, heads-up inspection magnifiers, wienie roasters, the list goes on and on...

If I can manage to put together a large reasonable quality mirror I expect to at least try using it for a telescope. I'm not expecting much there, but who knows? A 1 m diameter mirror will have some serious light gathering power. I am thinking about trying some electrical correction to a parabolic shape.

I_F