Automatic Off-Axis OTF Testing

David M Berg

doi:10.1117/12.938293

17 November 1986 Automatic Off-Axis OTF Testing

David M Berg

Proceedings Volume 0654, Automatic Optical Inspection; (1986) https://doi.org/10.1117/12.938293
Event: 1986 International Symposium/Innsbruck, 1986, Innsbruck, Austria

Abstract

The usefulness of a lens depends on its imaging performance over its entire field of view. An effective test must measure image quality at off-axis positions, as well as on axis. An automated system is described which quantifies image quality at several different field positions more quickly and precisely than is possible with a manual system. In addition to the Modulation Transfer Function (MTF), the Phase Transfer Function (PTF), field curvature and lens distortion can be measured. Algorithms used to find the off-axis image are discussed in detail, including trade-offs between speed and generality. It is shown that a well designed algorithm must take into account the expected characteristics of the off-axis image, with allowances for uncertainties. The operation of the test system is illustrated with examples.

Citation Download Citation

David M Berg "Automatic Off-Axis OTF Testing", Proc. SPIE 0654, Automatic Optical Inspection, (17 November 1986); https://doi.org/10.1117/12.938293

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