A generalized performance model for spatial interferometric hyperspectral imagers

摘要

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