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Hi Jo. Neat design. As you are using an airtight case can you build an evacuated chamber between the filter/cover glass and the sensor assembly. That will prevent fogging almost completely. Or just isolate the optical path and throw in a small bag of silica. I think this will be more effective than using heat from the TEC. Alternatively, duct air from the hot side of the TEC to the sensor face. Then again as the case is airtight, dry it out with silica. That should be effective, providing you can be assured of no leaks.
I guess the inside of the case will be insulated? The cold finger is a good option. Should work well.
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