Testing Temperature Uniformity Across a PI Heater Surface

https://smart-heater-journal.clearhavendigest.com/posts/how-to-select-the-right-kapton-heater-size-and-wattage

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