Testing Temperature Uniformity Across a PI Heater Surface

https://heater-technology-guide.theglensecret.com/ito-glass-heater-applications-for-anti-fog-and-defrosting-systems

In sensors, a pi heater must deliver heat in a controlled way. It uses a thin resistive foil circuit laminated in polyimide film. One useful trait is fast response. Still, local hot spots can change the result