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camera gain drift

Looking for a 1-2 Mp USB3 mono camera that has a stable black level.

I have 2 cameras (Thorlabs) that work fine (otherwise).

I am summing the pixels to get a measure of the incoming beam intensity.

Over the space of 20 hours or so the sums can vary as much as 30%, but a power meter in the same beam varies by 1%.

All auto-gain type controls are turned off.

 

Can anyone suggest a camera that doesn't drift?

 

 

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