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Proceedings Paper

Use Of The Interferometer And MTF Equipent In The Evaluation Of Optical System And Components
Author(s): N. P. Barton
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Paper Abstract

Though measurement of the Modulation Transfer Function (MTF) has become a practical technique for the evaluation of optical systems much useful testing work can still be done with an interferometer, espec-ially in the examination of components. Interferometer tests, which display the wavefront aberrations, can readily be used in the testing of optical components and sub assemblies but can be difficult to set up for testing complete telescopic sighting systems. MTF tests, which give a quantitative measure of the imaging performance of an optical system, can be used for sights, but for MTF to be effective parameters of tests must be carefully defined. Features of the test apparatus and procedures to enhance the reliability, ease of execution and effectiveness of tests are discussed. A simplified MTF test apparatus operating at a single spatial frequency scanning through all azimuths permits the use of concise MTF criteria for specification and quality control purposes; additionally in on-axis tests the dioptre setting of fixed focus eyepieces may be checked and in off-axis tests field curvature and astigmatism evaluated.

Paper Details

Date Published: 16 March 1976
PDF: 7 pages
Proc. SPIE 0073, Quality Assurance in Optical and Electro-Optical Engineering, (16 March 1976); doi: 10.1117/12.954690
Show Author Affiliations
N. P. Barton, Ministry of Defence (England)

Published in SPIE Proceedings Vol. 0073:
Quality Assurance in Optical and Electro-Optical Engineering
Lionel R. Baker, Editor(s)

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