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Proceedings Paper

The Computerized Evaluation Of A High Performance Aerial Reconnaissance Lens By A New Automated Lens Testing System
Author(s): David E. Smith
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Paper Abstract

The Modulation Transfer Function (MTF) imaging properties of an aerial reconnaissance lens have been tested using a recently developed, highly automated OTF measuring system. Combining sophisticated software with knife-scanning technology, the instrument is the most advanced OTF system ever built. Based upon user entered lens-under-test properties and specified tolerance requirements, the measuring system automatically determined the image analyzer focusing increment, number of sampled points per image scan, scan velocity and signal filtering through the use of various algorithms and computational techniques. Using a novel coarse and fine focusing routine, the instrument determined the plane of best focus for both sagittal and tangential information. As a final summary report, it automatically quantified and displayed, both alphanumerically and graphically, the "best focus" OTF, thru-focus OTF, astigmatism and field flatness data. A discussion follows of this new system's attributes and profound impact on classical lens testing techniques.

Paper Details

Date Published: 26 October 1983
PDF: 9 pages
Proc. SPIE 0399, Optical System Design, Analysis, and Production, (26 October 1983); doi: 10.1117/12.935460
Show Author Affiliations
David E. Smith, GCA Corporation (United States)

Published in SPIE Proceedings Vol. 0399:
Optical System Design, Analysis, and Production
Robert E. Fischer; Philip J. Rogers, Editor(s)

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