Abstract
In this paper we describe efforts to develop a closed-loop direct write scene generation (DWSG) focal-plane-array test capability (FPATC) at Arnold Engineering Development Center (AEDC). The DWSG methodology, illustrated in Fig. 1, provides high-speed photonics for visible and infrared focal-plane-array (FPA) diagnostics using lasers for real-time evaluation and scene simulation. The DWSG FPATC includes lasers operating at 0.514, 1.06, 5.4, and/or 10.6 μm and acoustooptic (AO) modulators for laser-beam control.1 High-speed RF electronics use direct digital synthesis (DDS) to drive the AO modulators with multifrequency input for multibeam output.2 DDS frequency modulation provides extremely accurate and independent deflection of the multibeam laser "rake"; DDS amplitude modulation similarly provides accurate and independent multibeam intensity control. Laser-beam scan optics focus the laser beams onto sub-pixel regions for pixel-to-pixel photoflux deposition with minimal stray radiation from diffraction. The laser-beam rake is then step-scanned across the FPA during each integration period.
© 1996 Optical Society of America
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