Often the sensor is placed at the "air on" position as this is where the coldest refrigerant will be and frost starts there and if the two halves of the unit sense the full width of the fin, (from the air on to air off side) and very close to it, it should be able to sense 1mm of frost before it becomes ice and as it is building up over perhaps 100-150mm, I cannot see how it can see through that length of frost as though it was clear.
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