PI Heater Prototyping: What to Review Before Finalizing the Design
https://thin-film-heating.summitquill.com/posts/custom-polyimide-heater-design-for-unique-shapes-and-heating-zones
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