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Design of a Tele-objective Zoom Lens and an Instrumentation for Assessment of Distances
Umeå University, Faculty of Science and Technology, Department of Physics.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Since the zoom lens was introduced, the right selection of the zoom lenses for a given condition has been a controversial decision. The Design of a good optical structure while keeping a balance between cost, magnification, zoom range and weight is challenging for optical engineers. This project describes and simulates two-zoom-lens-structures with four to five groups of lenses. One of the zoom-lens-structure is based on the Cook triplet design with four lenses and floating aperture. To achieve the desired requirement, the zoom lens comprises four group lenses of which three are movable. To provide zooming, the aperture stop is considered floating. The final system meets a set of preferred zoom lens camera characteristics like a sharp image, minimum aberration, reduced length of camera body and high zoom. Moreover, an instrument for distance measurement is designed. It is based on the method of minimization of astigmatism. By tilting some of the lenses, an optical system is designed with three high refractive power lenses that provides large amount of astigmatism. Finally, based on the results from spot diagram for tangential and sagittal focuses, a forth order polynomial function is introduced which can be used for calibration of the system.

Place, publisher, year, edition, pages
2012.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-117145OAI: oai:DiVA.org:umu-117145DiVA: diva2:905529
Subject / course
Fysik D - examensarbete
Available from: 2016-02-26 Created: 2016-02-22 Last updated: 2016-02-26Bibliographically approved

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