Testing Temperature Uniformity Across a PI Heater Surface
https://modern-heating-elements.fotosdefrases.com/how-to-choose-a-silicone-heater-for-industrial-equipment
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