Recombobulate correction method for oscillating scene change artifacts in longwave infrared Fourier transform...

Fourier transform spectroscopy is commonly used to measure spectra because of its accuracy and versatility. When the irradiance changes in the field of view (FOV), the spectra are contaminated by the scene change artifacts (SCAs). SCAs caused by an oscillatory obscuration affecting multiple target spectra were examined through simulations and experiments. This work demonstrates that SCAs are hundreds of times larger than the spectra. These SCAs are dependent on the oscillation phase and appear in the real and imaginary parts of the spectra. The recombobulate correction method (RCM) is introduced, which removes SCAs by separating interferogram points into target and background interferograms. RCM demonstrated a 99% reduction in spectral SCAs. Future work will address other non-oscillatory SCAs.