PI Heater Prototyping: What to Review Before Finalizing the Design
https://surface-heater-insights.northcrestbrief.com/posts/how-a-kapton-heater-supports-fast-and-controlled-thermal-response
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