Open AccessBifocal optical system for distant object tracking
Author(s) -
Xinping Liu,
Xianyang Cai,
Shoude Chang,
C. P. Grover
Publication year - 2005
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.000136
Subject(s) - optics , lens (geology) , tracking (education) , focus (optics) , focal length , computer science , birefringence , computer vision , physics , artificial intelligence , psychology , pedagogy
A new bifocal optical system used for distant object tracking is proposed. This system combines a birefringent element with a conventional glass lens so that the spot image size and its variation with the axial distance can be controlled according to the requirement of a distant object tracker. The lens design for the tracking application is discussed and an example is given. The new lens system provides a more uniform spot image size and an extended focal depth compared to a conventional lens with one focus.