In this paper a further characterization of the hyperspectral imaging (HSI) system that we developed is presented. This camera-based system is meant to be used for temperature determination in laser-based material processing. It comprises a high-speed camera and a self-developed HSI-lens system. It offers a time resolution in the µs-range and a spectral resolution of ∼4 nm.
In HSI spatial and spectral information upon the object/process to be investigated can be acquired simultaneously. The spectral information reveals spectral features of the process itself and it is used to derive temperature information. For temperature determination, the process emissions are considered to be black/gray-body radiation.
Based upon very promising initial HSI results, we present and discuss further HSI-derived observations of the laser-beam welding process within this paper. These results include temperature information as well as spectral characteristics. In addition, simultaneous high-speed camera observations were conducted and the results were connected with HSI-derived findings. This way, the influence of vapor on the measurement is evaluated and the HSI-technique is validated to be beneficial in monitoring laser-based material processing.