Calibration and nonuniformity correction of MICOM's diode-laser-based infrared scene projector

D. Brett Beasley; John B. Cooper; Daniel A. Saylor; James A. Buford Jr.

doi:10.1117/12.280973

15 July 1997 Calibration and nonuniformity correction of MICOM's diode-laser-based infrared scene projector

D. Brett Beasley, John B. Cooper, Daniel A. Saylor, James A. Buford Jr.

Proceedings Volume 3084, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing II; (1997) https://doi.org/10.1117/12.280973
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

A dynamic infrared (IR) scene projector which is based upon diode lasers is now operational at the US Army Missile Command's Research, Development, and Engineering Center. The projector is referred to as the Laser Diode Array Projector. It utilizes a 64-element linear array of Pb-salt diode lasers coupled with a high-speed optical scanning system, drive electronics and synchronization electronics to generate in-band IR scenes. The projector is interfaced to a real-time scene generation computer which is capable of 3D scene generation. This paper describes the process for calibration of the projector and the correction of spatial non-uniformities which are inherent in the projector design. Each laser within the system must be calibrated so that its output power is linear with respect to input gray level. The calibration table for each laser is stored in the projector electronics memory and is applied in real-time. In addition, spatial variations in perceived pixel intensity must be corrected such that the output scene is uniform. Gain and offset correction factors for each pixel are used to correct the spatial non-uniformities. The gain and offset terms are applied to each pixel in real-time by the projector drive electronics. The projector's overall performance characteristics, including the non-uniformity correction (NUC) performance level achieved-to-date, are presented in the paper. Issues associated with NUC limitations are also discussed. Sample images generated with the projector and captured by an InSb FPA sensor are included in the text.

Citation Download Citation

D. Brett Beasley, John B. Cooper, Daniel A. Saylor, and James A. Buford Jr. "Calibration and nonuniformity correction of MICOM's diode-laser-based infrared scene projector", Proc. SPIE 3084, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing II, (15 July 1997); https://doi.org/10.1117/12.280973

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