Reliability Checks to Consider Before Approving a PI Heater Design

https://thermal-technology-center.cavandoragh.org/how-etched-foil-circuits-are-used-in-a-polyimide-heater

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