[ATM] 5-fold webcam way
Francis J. O'Reilly
foreilly at bestweb.net
Tue Apr 20 22:53:13 JST 2010
We might have one in operation at the Draper event in Hastings-on-Hudson, NY
on June 19, 2010. Can you attend?
----- Original Message -----
From: "Guy Brandenburg" <gfbrandenburg at yahoo.com>
To: "ATM List" <atm at atmlist.net>; "Vladimir Galogaza"
<vladimir.galogaza1 at zg.t-com.hr>
Sent: Tuesday, April 20, 2010 9:24 AM
Subject: Re: [ATM] 5-fold webcam way
I am not opposed to trying a bat interferometer! I just want to SEE one in
operation with my own two eyes. Then building it will be easy.
I'm funny that way.
Anybody got one in operation east of the Mississippi River, south of Canada,
and east of the Atlantic Ocean?
Guy Brandenburg, Washington, DC
My blog, mostly on Education in DC:
My home page on astronomy, mathematics, education:
--- On Tue, 4/20/10, Vladimir Galogaza <vladimir.galogaza1 at zg.t-com.hr>
> From: Vladimir Galogaza <vladimir.galogaza1 at zg.t-com.hr>
> Subject: Re: [ATM] 5-fold webcam way
> To: "ATM List" <atm at atmlist.net>
> Date: Tuesday, April 20, 2010, 7:18 AM
> Hi Guy,
> >It's a device that allows you to use a webcam to record
> 5 different types
> >of mirror tests:
> >* a wire test with beamsplitter
> >* a knife-edge test (slitless)
> >* a ronchigram with 66 LPI
> >* a ronchigram with 85 LPI (iirc)
> >* a ronchigram with 133 LPI (iirc)
> >and making the holder for the beamsplitter
> >It all sits on an XYZ table
> You are just one small step (lens) away from Bath
> interferometer for which
> you need:
> 1) a webcam
> 2) beamsplitter
> 3) BCX lens FL 10 -15 mm, Diameter 7 or more mm.
> 4) small first surface flat mirror square at
> least 5x5 mm or similar
> 5) laser pointer
> 6) XYZ table
> You already have critical items 1,2,and 6. Very likely you
> have laser
> and small flat and lens in your or club members stock.
> It is fine to have all the mentioned variations of
> Foucault or Ronchi,
> but there will be huge step to have an interferometer in
> I am not giving up in trying to persuade you on this.
> You are consistent in not even considering to give it
> a try.
> Let us see who will last longer.
> In case that you decide to try it, I am offering all the
> help you may need.
> It will be nice to have at last the interferometer in an
> ATM club.
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