Focus adjustment-free imaging over a long range

Details Focus adjustment-free imaging over a long range Focus adjustment-free imaging over a long range

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999optco.165..171l&link_type=abstract

Optics Communications, Volume 165, Issue 4-6, p. 171-176.

Physics

Optics

Imaging, Field Depth, Focal Depth, Nondiffracting, Focus Adjustment-Free, Galilean Telescope

Scientific paper

Focus adjustment-free imaging over a long range is demonstrated, both theoretically and experimentally, by using a simple telescopic system of the Galilean type that has an eyepiece with specified spherical aberration. Computer simulation results show that such a telescopic system with a 5 cm aperture can form clear images of a target over a range from 60 to ~400 m, without focusing adjustment. The imaging results of an experiment carried out using such a telescopic system confirm that clear images can indeed be obtained in this range without focusing adjustment, verifying the usefulness of the new technique.

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