Testing Temperature Uniformity Across a Glass Heater Surface

https://high-precision-heating.readspirex.com/posts/common-mica-heater-problems-and-practical-troubleshooting-tips

In camera windows, a glass heater must deliver heat in a controlled way. It uses a glass panel combined with a conductive heating layer or heater element. One useful trait is anti-fog capability. Still, thermal stress can change the result