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15 June 1994 Digital Mirror Device infrared scene projector
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Abstract
This paper describes the initial development of an IR scene projection system that will produce time-varying scenes using the Texas Instruments digital mirror device (DMD). We develop a dark field IR projector design in which light reflected from a DMD pixel is reflected into the aperture of the projector when the pixel is on and remains outside the aperture when the pixel is off. We apply an effective blackbody temperature model and a previously developed diffraction model to a projector design with an aperture stop smaller than the main lobe of the on pixel diffracted light. We show that this arrangement provides optimum blackbody temperature and image resolution performance. We calculate that a projector of this type could produce adequate resolution with effective temperatures of almost 400 degree(s)C. A breadboard DMD scene projector using a filtered quartz tungsten-halogen light source which provided IR emission at 1 micrometers and a 768 X 576 digital DMD device with 16 micrometers pixels was constructed. A contrast ratio of over 100 to 1 was observed with resolutions greater than one-half of the device resolution. A preliminary optical illumination and projection design is described for a brassboard DMD IR scene projector.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dennis R. Pape and James A. Carter III "Digital Mirror Device infrared scene projector", Proc. SPIE 2223, Characterization and Propagation of Sources and Backgrounds, (15 June 1994); https://doi.org/10.1117/12.177950
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