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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 12, Iss. 4 — Apr. 1, 1973
  • pp: 743–748

Additional Filters Enhancing the Sensitivity of an Optical Correlator

A. Engel  »View Author Affiliations


Applied Optics, Vol. 12, Issue 4, pp. 743-748 (1973)
http://dx.doi.org/10.1364/AO.12.000743


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Abstract

The influence of additional filters upon the output of an optical correlator is studied for the case of a spatial filter measuring the size of rectangles. Addtional filters leading to increased sensitivity are derived by means of a series expansion. One type of additional filter, consisting of several transparent slits, yields a linear relation between output signal and the deviation from the desired size. The other additional filter, effecting a quadratic output characteristic, is a properly dimensioned bandpass. Experimental results demonstrate the enhancement of sensitivity achieved with additional filters. As this method can easily be extended to a correlator measuring the diameter of circular apertures, additional filters may be of interest in the field of automatic production control.

© 1973 Optical Society of America

History
Original Manuscript: June 8, 1972
Published: April 1, 1973

Citation
A. Engel, "Additional Filters Enhancing the Sensitivity of an Optical Correlator," Appl. Opt. 12, 743-748 (1973)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-12-4-743

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