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Proceedings Paper

Automatic Mtf Measurement (AMMD) For 400 To 700 Nm Wavelength Range
Author(s): Patrick Defay; Andre Masson; Pierre Nory
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Paper Abstract

The lens, for example a zoom lens for SLR cameras, is used as a projection lens and projects on a wall the image of a bar pattern. The AMMD sensors are 5 CCD linear arrays (1024 pixels each)checking simultaneously MTF at center of field and at four positions at 3/4 of field on the diagonals of the image. The AMMD electronics allow very quick focussing of the image and fast measurement of the squarewave MTF of the lens. Typical response time is 50 ms when one CCD is used and 250 ms when 5 CCD are used. The AMMD includes automatic gain control, calibration of each pixel for whole gain range, smoothing of datas before computation of MTF. Main components of the device are Reticon CCD (EGG), preamplifiers, analog multiplexing, A/D conversion, 68 000 micro-processor for computation. Controls include selection of 1 to 5 CCD, recalibration and 5 two digits displays. An example of optical adjustment and measurement of a zoom lens will be given, showing the advantage of the AMMD when they are used in workshop for series production.

Paper Details

Date Published: 29 January 1985
PDF: 4 pages
Proc. SPIE 0518, Optical Systems Engineering IV, (29 January 1985); doi: 10.1117/12.945187
Show Author Affiliations
Patrick Defay, R&D Dept. (France)
Andre Masson, R&D Dept. (France)
Pierre Nory, R&D Dept. (France)

Published in SPIE Proceedings Vol. 0518:
Optical Systems Engineering IV
Paul R. Yoder Jr., Editor(s)

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