Re: [ATM] Bench star test

[Dale Eason <atmpob@yahoo.com>]

Camera is at ROC as well with lens removed.  The laser
was from Walgreen Drug store $9.00.  Came from their
flash light section.  Had a goose neck with a LED as a
flash light and a laser pointer all in one.  Laser
diode's without their lens make a very good point
source.

I used various powers and web cam settings.  I use a
100 ohm potientometer to lower the current.  The star
test images were done at 0 ohms and 3 volts so it was
lasing.  Mirror was coated.

Dale Eason

--- Jim McPherson <jim@eflightproducts.com> wrote:

> Hi Dale,
>         Very interesting results. I'd like to try
> that out. Can you 
> detail how your setup works? The bare laser diode is
> at ROC, where is 
> the webcam and how is it setup? What power laser
> diode did you use? Is 
> it at or below threshold (is it lasing or just
> glowing)?
> 
> -Jim
> 
> Dale Eason wrote:
> > I tried what is for me a new way to star test and
> then
> > compared it to my simulated star test from
> > interferometry data.  The mirror is an 8 inch with
> ROC
> > of 119 inches.
> >
> > The bench star test was done at ROC using a red
> laser
> > diode with the lens removed to make a point source
> > light.  The detector was a Philips web cam with
> the
> > lens removed.
> >
> >
>
http://home.comcast.net/~doeason/interferometer/star_bench_igram.jpg
> >
> > The red image is the laser and web cam.  The black
> and
> > white image is the simulated version from
> > interferometry data.
> >
> > I think the laser point source and web cam show
> > promise.
> >
> > Dale Eason
> >
> >
> >        
> >
>
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