A generalized performance model for spatial interferometrichyperspectral imagers

摘要

We produced a one-dimensional model of the signal to noise performance of Fourier Transformhyperspectral imagers using microbolometer array detectors. Our prior work could predict the peakresponse of such sensors, but not a measured fall-off in SNR at short and long wavelengths. We improvedthe fidelity of the model by including necessary wavelength dependent terms. We then tested the modelusing the measured performance of an FTIR, and critical measurements of the relative wavelengthresponsivity and NEDT of the microbolometer camera, and the wavelength response of the beamsplittermodulation. The model agrees with measurement with 15%, and the difference is consistent with the lackof spatial nonuniformity in the model. We also present similar analysis using the interferometer and acooled mercury cadmium telluride camera showing that high performance can be obtained if dark currentscan be reduced relative to commercial broadband IR cooled cameras.