-------- Original Message --------
Subject: Mini Review
Date: Wed, 25 Aug 2004 11:35:09 +0200
From: Werner Riegler <Werner.Riegler@cern.ch>
To: Kevan Hashemi <hashemi@brandeis.edu>

Hi Kevan --

I just calculated the positioning accuracy requirements of the BCAMs on
the spaceframe. Could you please check if this is reasonable.

Distance of lens to CCD: 75mm
CCD size: 344x244 pixels = 3.44 x 2.44 mm
-> max angular range 45x32 mRad.

Maximum expected measurements +-5mRad in X, very small in Y
-> angular range 35x32 mRad

Distance of BCAM lenses on the Spaceframe: 1052mm
-> max positioning range: 37x32 mm

In case we want to see both lightspots in X we have to subtract 16mm
-> max positioning range: 21x32 mm

Of course one has to be a bit inside this since you want to see the
whole light spot ...


         Would this approximately make sense to you ?

                         Cheers&Thanks  Werner