Re: Hobby-Eberle Was Re: [ATM] ATM edge support

["Scott Ewart" <scott.e@quicksurfer.com>]

Bob,
    I'm pretty sure the detector sees about 9.2m at any given time.

    And I thought a field de-rotator was complicated.

Scott


----- Original Message ----- 
From: "James P Crombie" <jpcrombie@pei.eastlink.ca>
To: <atm@atmlist.net>
Sent: Sunday, May 15, 2005 4:34 PM
Subject: Re: Hobby-Eberle Was Re: [ATM] ATM edge support


Bob
 You are right.  The detector is mounted at the focal point and as far
as I can determine from the website there are several different modes.
One, if I remember the tour correctly uses a plate with slits and fiber
optic cables.  The fiber optic cables  run to a receiver of some type to
record the spectra.  The plate is oriented in a frame that can move in
XYZ coordinates to follow the movement of the stars(according to the web
site it tracks in 6 axis).  the scope is stationary during this and only
the plate moves.  When the plate reaches the limits of movement, they
then rotate the entire scope, reset the plate to the beginning and start
over.  The scope itself is lifted on air bearings, rotated and then let
down again.  It shows a picture of the top section here.
http://www.as.utexas.edu/mcdonald/het/het_gen_02.html

Bob May wrote:

>Since it is a spherical primary, how much of it is really used at a time
>(vignetting by hte final optics is assummed here)?  I'd susect that the
>detector section of the optical train moves during an image capture for 
>fine
>guiding.
>Bob May
>bobmay@nethere.com
>http://nav.to/bobmay
>http://bobmay.astronomy.net
>
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