From: hermit 
CC: atm{at}shore.net
Reply-To: hermit 


Michael Peck wrote:
>
> At 15:06 12-01-03 +0000, tkrajci{at}san.osd.mil wrote:
>
> > > From:  Don Ware - Mimas{at}aol.com
> > > As the camera is only checking for relative intensity between the
> >average of
> > > pixels from the left zone and pixels from the right zone, is linearity
> > > important?
> >
> >Are you sure the camera/optical system/test rig/light source has no
> >vignetting?  How have you checked for this?  If there is vignetting or
> >other uneven illumination of the setup...you may *think* you've got equal
>
> All the ATM attempts I know of at automating a Foucault test involve
> matching up brightness values on left and right hand sides of the mirror.


Remember, the ulitmate goal is to come up with something easier and more
repeatable than the guess by eye method that has proved to be pretty damned
good for some folks.

My setup has show a pretty good correlation between the two.  If I ever get
a chance to do another mirror, I want to have it independently tested to
see how well it works.

Ken

--- BBBS/NT v4.00 MP