A Practical OEM Checklist for Specifying a PI Heater

https://precision-heat-works.opalvector.com/posts/why-thermal-uniformity-matters-in-semiconductor-heater-design

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