Re: [ATM] Here is what happens when you warm the edge of a 18 x 2Pyrex mirror

["Scott Milligan" <starzkey@charter.net>]

Good stuff, Dale.   Do you have any data showing how the overall RMS error
changed after heating, or how long it took for the figure to relax after the
heat was initially applied?  

It looks like Steve K has a pretty nice mirror, (but does he ever find time
to use it in a telescope? Grin)

Scott Milligan


 

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Dale Eason
Sent: Monday, January 16, 2006 9:18 PM
To: atm@atmlist.net
Subject: [ATM] Here is what happens when you warm the edge of a 18 x 2
Pyrexmirror

I thought you might like to see the results of warming
the edge of a 18 x 2 Pyrex mirror with my hand and
then taking interferograms and analyzing them. I
placed my palm on the upper right edge.  The mirror
started at 69 deg F and I placed the palm of my hand
on the edge for 1 minute. It raised the front surface
of the edge by about 45 nm.

3D wire frame image
http://home.comcast.net/~doeason/hand_heat.gif


It took about 5 minutes to take all the
interferrograms. Then the
results were averaged together. The mirror was cooling
during that time.

Color 2D contour map with Zernike terms.
http://home.comcast.net/~doeason/contour_map_hand_heated_edge.gif


A profile right to left through the diagonal showing
surface error
in nanometers.
http://home.comcast.net/~doeason/profile_hand_heat.jpg

Dale Eason


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