Reliability Checks to Consider Before Approving a PI Heater Design

https://thermal-engineering-guide.oakmontscope.com/posts/how-watt-density-affects-silicone-heater-performance

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