Measurement Of Optical Modulation Functions In Sparsely Sampled Mosaic Focal Plane Arrays

J. B. Young; P. E. Thurlow

doi:10.1117/12.933774

23 November 1982 Measurement Of Optical Modulation Functions In Sparsely Sampled Mosaic Focal Plane Arrays

J. B. Young, P. E. Thurlow

Proceedings Volume 0345, Advanced Multispectral Remote Sensing Technology and Applications; (1982) https://doi.org/10.1117/12.933774
Event: 1982 Technical Symposium East, 1982, Arlington, United States

Abstract

When individual detectors in scanned focal plane arrays are sampled at a rate of once per instantaneous field of view (IFOV), a problem arises in measuring detector optical modulation functions, (SWR, MTF). Ideally, one would like to pass a slit illumination or knife edge illumination across an IFOV, generating respectively, a line spread function or knife edge response curve from which optical modulation could be calculated versus spatial frequency. Use of sampling phase delays is a possible solution, but is subject to phase errors resulting from scan rate variations. The method described here is a "phased knife edge" approach. It employs a multi-bar reticle image, designed so that successive bar edges are slightly shifted in phase with respect to an IFOV area as the IFOV signal is sampled during a single scan. The resulting data, after conversion to a knife edge response function, is convolved with a sliding phase, computer-generated square wave image to find SWR versus spatial frequency. MTF is obtained by converting the knife edge response to a line spread function and applying standard algorithms for convolution of the LSF with sinusoidal bar patterns of desired spatial frequency.

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J. B. Young and P. E. Thurlow "Measurement Of Optical Modulation Functions In Sparsely Sampled Mosaic Focal Plane Arrays", Proc. SPIE 0345, Advanced Multispectral Remote Sensing Technology and Applications, (23 November 1982); https://doi.org/10.1117/12.933774

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KEYWORDS

Sensors

Reticles

Modulation

Modulation transfer functions

Optical testing

Spatial frequencies

Staring arrays

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