This paper presents a study of phase transmittances of some diffractive elements with a great depth extended focus for application in an automatic imaging system, specifically in a visual inspection system. These diffractive elements are like axicons, the light sword optical element (LSOE) and the peacock eye optical element (PEOE), they have the property to form a focal segment on the optical axis. The quality of the images is analyzed from the information given by the modulation transfer function MTF, in order to choose the most suitable refractive element. Finally, a small application of a visual inspection system is made by filtering edges.

© 2016 Optical Society of America

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