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Message ID: 520     Entry time: Thu Jun 5 10:46:26 2008
Author: josephb 
Type: Configuration 
Category: Cameras 
Subject: Approximately uniform reflected white light 
In an attempt to investigate the structures seen in previous images for the GC750, I aimed it at a relatively clean section of gray table top roughly a cm or two from the surface and took images (without a lens). As I was holding this with my hand, the angle wasn't completely even with the table, and thus there's a gradient of light in the pictures. However, one should in principle be able to pick out features (such as a circular spot with less sensitivity), but these do not show up.

In my mind, these images seem to indicate the electronics are fine, and suggest that the CMOS or CCD detectors themselves are undamaged (at least in regards to white light, as opposed to 1064nm). An issue with the plastic cap (protective piece) may be the culprit, or perhaps a tiny bit of dust, which the incoherent light from all angles goes around efficiently?

Will try blowing the cameras with clean nitrogen today and see if that removes or changes the circular structure we have seen.
Attachment 1: GC650_white_light.pdf  45 kB  | Hide | Hide all
GC650_white_light.pdf
Attachment 2: GC750_white_light.pdf  39 kB  | Hide | Hide all
GC750_white_light.pdf
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