FT-IR Coupled Goniometer Setup for Characterization of the Spatial and Spectral Emission of IR-Sources

We present a FT-IR coupled goniometer setup, which allows the simultaneous spatial and spectral characterization of optical components used in non-dispersive infrared gas sensor systems. The performance of the laboratory setup is demonstrated by comparing reflector and Fresnel lens equipped thermal infrared radiation sources. We show that even the simplest binary Fresnel lenses, when optimally designed, can achieve a thinner emission angle than parabolic mirrors at comparable radiation intensities.