Choosing a Control Method for a PI Heater in Automated Equipment

https://advanced-thermal-systems.summitviewdaily.com/posts/semiconductor-heater-solutions-for-etching-and-process-equipment

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