A Practical OEM Checklist for Specifying a PI Heater

https://thermal-innovation-hub.slatecurrent.com/posts/how-to-integrate-a-glass-heater-into-an-existing-product-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