Re: [ATM] Re: RC with multiple primaries

["matt" <mariusrf@bellsouth.net>]

well, you'll need a longer winter than you have even in Sweden, because you
can't just tip/tilt one mirror to match the fixed one. You'd also need to
*flex* one mirror to match the other . You won't be using a simple quad cell
but a large Shack Hartmann to measure the wavefront error and a vast number
of power hungry and heat producing expensive actuators, with a huge amount
of supporting electronics behind them . But a large array of DSP's or
processors might come in handy to keep you warm until spring ;-)

best regards,
matt tudor

-----Original Message-----
From: Dominic-Luc Webb <dlwebb@canit.se>
To: vladimir sacek <vladis.2@juno.com>
Cc: atm@atmlist.net <atm@atmlist.net>
Date: Wednesday, November 17, 2004 12:43 PM
Subject: Re: [ATM] Re: RC with multiple primaries


>
>Now maybe my two cents worth.... I have been anticipating a multiple
>mirror design. I recognize that collimation is a major limitation to
>success. As many of you know, the lensless Schmidt is the design I
>have been experimenting with the most recently. This design is by
>and far the simplest of all designs, having only a single spherical
>optical surface (the mirror). Collimation is a relatively brainless
>exercise. I would think there are a few ways to put a couple of similarly
>speced spherical mirrors together. For faint objects, I suppose if one
>has a couple of separate detectors, it would be possible to run
>correllative statistical comparisons of incoming signals to identify
>signals from noise. Alternatively different filter sets might be used.
>
>Putting the two beams together in this design seems more straightforward.
>I have considered the possibility of using mirrors mounted on speaker
>attenuator coils to converge the beams and this would get feedback from
>a CCD or PMT based imager. In this case, one mirror is generally fixed
>and the other gets feedback such that divergence from the first mirror
>is immediately compensated. I think this is not different from protocols
>used for CCD guidance/tracking, which is now commonplace.
>
>To be honest, I have not yet found a serious application for this. I only
>see it as an amusement to occupy my time indoors now that Winter is
>hitting us up here in Sweden. If any of you experts in here want to
>tear this idea apart or offer recommendations, now is a great time. The
>case subject mirrors are  300 mm F/3.
>
>Dominic-Luc Webb
>
>
>
>_______________________________________________
>ATM mailing list http://www.atmlist.net/
>

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