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Proceedings Paper

MTF testing of imaging systems: A practical solution for production environments
Author(s): Samuel P Sadoulet
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Paper Abstract

Current trends in the industry require the need for high volume precision optical assemblies coupled with certifiable 100% Modulation Transfer Function (MTF) inline testing. This is especially true in the highly competitive automotive and cellular phone / PDA markets. This necessity has been particularly problematic for MTF metrology, which is traditionally an expensive and slow endeavor reserved for cost-insensitive low-volume projects. A concept is examined for calculating the MTF of a lens based on its edge response. The edge is tilted with respect to the scanning axis in order to avoid issues stemming from the sampling limit of the detector. This enables us to characterize a large number of field points simultaneously, which greatly increases the MTF measurement speed. The results of the experiments and the noise analysis seem consistent, indicating that this method can be expected to produce less than 4% RMS error within the established operating range. An instrument for MTF analysis has been developed that strikes a reasonable balance between accuracy, throughput, and cost, thus making it practical for a large-volume production quality control environment.

Paper Details

Date Published: 2 May 2005
PDF: 3 pages
Proc. SPIE 10315, Optifab 2005: Technical Digest, 103150N (2 May 2005); doi: 10.1117/12.609596
Show Author Affiliations
Samuel P Sadoulet, Edmund Optics, Inc. (United States)

Published in SPIE Proceedings Vol. 10315:
Optifab 2005: Technical Digest
Robert E. Fischer; Masahide Katsuki; Matthias Pfaff; Kathleen A. Richardson, Editor(s)

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