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Hi Alistair. Heating is conductive and convective. I have purposefully ensured that the element is loose in the sleeve. However, the fit is too tight in the camera and I will have to make a narrower coil to keep it all loose and minimize firm contact with surfaces.
The filter glass gets warm, tested out of the camera, and yes there will be a radiative effect to the sensor face and conduction around the edge of the filter glass sensor interface. The tape is a barrier to some extent and is not deforming - so I guess OK.
As with all this, I need to factor in operational warming of the sensor + filter glass temperature. Deicing capability will be the sum of these, rather than brute force heating applied directly to the filter glass.
It is quite brutal at 7V and defogs in an instant. At lower voltages there is a warm up time that I will need to observe. It evaporates fogging rapidly. I fogged the filter with heating off and timed the rate of clearing at room temperature and then incrementally increased the heater voltage, timing each phase. At room temperature the glass was very warm at 7v, but touchable.
Obviously, there is competition for cooling and if I could find a non-destructive way to pipe warm air, that would be kinder to the camera.
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