Computational model to configure the AEDC 7V chamber optical system and to simulate the measured optical performance

James D. Selman Jr.

doi:10.1117/12.210061

22 May 1995 Computational model to configure the AEDC 7V chamber optical system and to simulate the measured optical performance

James D. Selman Jr.

Author Affiliations +

Proceedings Volume 2470, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing VI; (1995) https://doi.org/10.1117/12.210061
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

Refurbishment of the Arnold Engineering Development Center (AEDC) 7V high-vacuum cryogenic chamber has recently been completed. This chamber now provides a high-fidelity ground calibration and test facility for infrared surveillance sensors and infrared seekers. Although the chamber optical system was originally designed for diffraction-limited performance in the MWIR to LWIR wavebands, its actual performance allows near diffraction-limited testing into the SWIR over a 20-mrad-square field of view. With a test pupil diameter of 50 cm, 20 K temperature capability, multiple blackbody targets, excellent vibration isolation, exceptional optical performance, and supporting analysis capability, the AEDC 7V is a premier space environmental chamber capable of meeting sensor/seeker ground test requirements well into the next century. Optical collimation of the blackbody sources is provided by a long focal length, unobscured cassegrain. Installation, alignment, and performance testing of the all-metal cassegrain in the chamber were achieved early in 1994. This paper reviews the computational procedures required: (1) to define the final ground test configuration and system alignment after installation of the cassegrain; and (2) to create a computational model that reproduces the interferometrically measured wavefront performance of the installed collimator.

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James D. Selman Jr. "Computational model to configure the AEDC 7V chamber optical system and to simulate the measured optical performance", Proc. SPIE 2470, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing VI, (22 May 1995); https://doi.org/10.1117/12.210061

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KEYWORDS

Performance modeling

Wavefronts

Sensors

Mirrors

Collimators

Data modeling

Optimization (mathematics)

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