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Recombobulate correction method for oscillating scene change artifacts in longwave infrared Fourier transform
Applied Optics
|August 12, 2025
Summary
Scene change artifacts (SCAs) in Fourier transform spectroscopy are significantly larger than spectra. A new method, recombobulate correction method (RCM), effectively removes these spectral artifacts, improving measurement accuracy.
Area of Science:
- Spectroscopy
- Optical Physics
- Signal Processing
Background:
- Fourier transform spectroscopy (FTS) is a versatile technique for spectral measurement.
- Scene change artifacts (SCAs) contaminate spectra when irradiance in the field of view (FOV) changes.
- SCAs can be significantly larger than the actual spectral signals.
Purpose of the Study:
- To investigate SCAs caused by oscillatory obscuration in FTS.
- To quantify the magnitude and characteristics of these SCAs.
- To introduce and validate a novel method for SCA removal.
Main Methods:
- Simulations and experimental investigations were employed to study SCAs.
- The recombobulate correction method (RCM) was developed to separate target and background interferograms.
- RCM was applied to interferograms affected by oscillatory obscuration.
Main Results:
- SCAs were found to be hundreds of times larger than the spectra.
- SCAs exhibited dependence on oscillation phase and affected both real and imaginary spectral parts.
- RCM achieved a 99% reduction in spectral SCAs.
Conclusions:
- Oscillatory obscurations cause significant SCAs in FTS.
- RCM is a highly effective method for mitigating SCAs in FTS.
- Further research is needed to address non-oscillatory SCAs.
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