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19 July 1999 Design, fabrication, and alignment of a broadband zoom collimator for the wideband infrared scene projector (WISP)
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Abstract
Contraves Brashear Systems has designed and fabricated a low-distortion, 2:1 zoom collimator for projection of infrared scenes in the spectral region of 1.5 to 12.0 micrometers to provide dynamic scenes for the Wideband Infrared Scene Projector for testing of missile seekers and other FLIRs. This paper explains the general requirements of the projection collimator optics and describes the system design, assembly, and test. The collimator projects dynamic scenes generated by two 512 X 512 arrays of resistive- emitter elements. The system is composed of four off-axis, powered mirrors, a beamsplitter, spectral filters and array windows. Three of the mirrors and the arrays move to accommodate changing the field-of-view. The worst-case geometric spot size (85% encircled energy) at any field position is less than 0.8 of the angular subtense of an array element for the entire zoom range. Distortion is less than 0.7% and the overlap of the two arrays is better than 0.1 pixels at any field position.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James W. Arendt "Design, fabrication, and alignment of a broadband zoom collimator for the wideband infrared scene projector (WISP)", Proc. SPIE 3697, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing IV, (19 July 1999); https://doi.org/10.1117/12.352924
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