Re: [ATM] Bench star test

["Bob May" <rmay@nethere.com>]

Sounds like that may be a neat source for the DAFT )Diffraction
Assisted Foucault Test_ as shown on my pages Thanks to someonewho
sent it in to me.  The test basically is looking at the
diffraction pattern of wires across the holes in a mask to locate
the zero  distance between the left and right holes of the mask.
The problem with this test is that thelight needs to be pretty
bright to get the diffraction to show up.  The tilt between the
left and righ holes in the mask is forty five degrees so that
when the two crosses overlay  each other, you're at a known good
location.
Grab a mask andd place some small wire in the two holes in a cros
and see if you can see the spider diffraction patttern with that
light source.  Vertical/horizontal wires on one side and an X on
the other side and when you are overlaying the two patterns at
the focus of that zone, you will have the crossings overlay each
other.  Should be an easy test to do with what you have now.
Whgat is so nice about this test is that you don't have to
compare the brightness of thee two sides but rathere just overlay
the two return beams.  The only bad part about the test is thtat
you need to focus on the focal point of the returned beam.
Bob May
Due to the large volume of SPAM thaat I'm getting, add an open
square bracket to the subject line or my spam filter will reject
your post~
rmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net
Replace the obvious words with the proper character.

_______________________________________________
ATM mailing list http://www.atmlist.net/