22 August 2003 Precise modulation transfer function measurements for focal plane array systems
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Abstract
This paper provides an improved method of measuring the modulation transfer function (MTF) in undersampled systems. We show that the currently used canted slit 2D FFT method is limited because interference between the aliased Fourier components and the side-peaks in the non-aliased signal significantly influences the MTF measurements at spatial frequencies larger than the Nyquist frequency. In our new approach, the effective temperature of the slit illumination varies along the slit, with the intensity profile chosen to minimize the interference between the aliased and non-aliased signal components. The accuracy of the measurement procedure has been improved to the point where the main limitation is the temporal and the fixed pattern noise of the IR camera. Experimental results confirming the accuracy at frequencies both below and above the Nyquist frequency are presented.
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Robert A Joyce, Leszek Swierkowski, "Precise modulation transfer function measurements for focal plane array systems", Proc. SPIE 5076, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIV, (22 August 2003); doi: 10.1117/12.486905; https://doi.org/10.1117/12.486905
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