I have a 2 layer board that I am mounting directly to an aluminum housing. The circuit contains a temperature regulation circuit to monitor housing temperature by way of an NTC thermistor. As the resistance drops, power is reduced until steady state is reached.
Below is a pic of how I did it. The thermistor pad is connected to the ground plane with some vias. Hopefully the heat conducts from the housing, into the ground plane, and into the thermistor. Could this work? Does the thermistor body need to be mounted to the surface to work properly? Any idea how accurate this might be and is there a better way or standard practice?
I should note this is a little 0805 package thermistor and current is extremely low, it's just a sensing circuit not a power circuit.