OK, scrap the above configuration. Not enough internal space to get silica inside and there are some mechanical problems internally. I have a new idea that looks quite easy to implement and is mostly reversible should it not be as successful as I'm hoping. Details on that later.
But, heating the window is the next problem to be solved. In a simlar setup to the above, ie the window being forward of the adapter how much heat is required to maintain a temp sufficient to keep it from frosting up ? Pretty sure I can build a resistive ring that will give values in the half to quarter watt region but is this sufficient ?
I'm pushing the window out ahead of the camera to reduce thermal transfer back to the sensor etc. I could push the window back inside the adapter and use an airflow but that might introduce more moisture.
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