Re: ATM Foucault test accuracy

[George Anderson <georgea@CAM.ORG>]

I think this would be a great idea, it would give many of us a very good
idea as to just how well we are testing. It unfortunately may trash a
lot of newbies (myself included) claims to errors. But without a
benchmark like this we will never know.
I would be interested in such a venture, but would want to be towards
the end of the list due to personal commitments (have to finish building
my house).

George Anderson
Montreal Canada

Clear skies and good health

Mel Bartels wrote:
> 
> We can do another round of "mirror mirror on the wall, who judges the
> figure best of all?" if you people wish.  We need 2 mirrors: 1 that is
> closely figured with minimal error, and one that has medium grade
> errors.  That way we can test the hypotheses that "__________ <-fill in
> your test method that you wish to employ> can accurately diagnose small
> and medium grade errors for the purposes of figuring and mirror
> performance rating".
> 
> We also need people signed up and a time schedule that is adhered to, so
> that we can each have a couple of days to test, then ship the mirrors onto
> the next person in line.  The time sched is important so that we can work
> around vacations and the like.  You have to pay shipping to the next
> person.
> 
> Only at the end will someone perform an interferometric test (hopefully
> two of them).  In the first "mirror mirror on the wall", someone did
> perform the interferometric test as their choosen test.  It is important
> that you send test results to one person, and not discuss them amongst
> yourselves, otherwise you get 'knowledge creep' of the mirrors, which
> invalidates the hypothesis test.
> 
> This would be a good chance to see how you stack up with others.  Take the
> mirrors to your local TM group, but caution them to not share with others
> outside of their group knowledge of the mirrors.
> 
> Mel Bartels