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Message ID: 71     Entry time: Fri Jul 23 12:33:51 2010
Author: Aidan 
Type: Computing 
Category: Hartmann sensor 
Subject: Invar clamp scatter 

I illuminated the Hartmann sensor with the output of a fiber placed ~1m away.

I noticed that the illumination was not uniform, rather there was some sort of 'burst' or 'star' right near the center of the image. This turned out to be due to the Hartmann plate clamps - it disappeared when I removed those. It appears that there is scatter off the inner surface of the holes through the clamp plates. I'm not sure if it's from the front or back plates.

Needs further investigation ...

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