Spectral analysis of thermal emitters for spectrally accurate IR scene projection: an update

Multispectral IR imaging sensors provide an additional dimension of data compared to conventional devices. Testing and validating these detectors requires a spectrally controlled and reproducible test scene. IR scene simulators aim to generate a realistic IR scene using artificial IR emitters and optical components. To ensure both spatial and spectral accuracy of the scene, it is crucial to have precise knowledge of the spectral characteristics of these components. This work focuses on the investigation and modification of low-temperature thermal emitter spectra. We utilize a grating spectrometer in combination with quantum IR detectors to determine the emission spectra of thermal IR sources. The entire system is calibrated to accurately record the spectra of arbitrary thermal IR emitters. Finally, methods to tailor the emission spectra to a desired realistic spectrum are discussed. In summary, this study provides the basis for a physically accurate IR scene simulation setup, with particular emphasis on spectral realism.