In open-die forging, a heated piece of metal is shaped between non-fixed tools such as presses or hammers, with temperature being a crucial factor in formability and workpiece quality. To achieve the desired mechanical properties and controlled deformation of large or complex forged parts, the temperature of the workpiece must be closely monitored. Non-contact optical temperature measurement systems reliably measure the surface temperature, even with highly variable geometries, thereby supporting stable and precise process control.