Practical measurement of cell-phone camera lens focal length

Tom D. Milster, William P. Kuhn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A practical instrumentation configuration for measuring focal length of cell-phone camera lenses is presented that uses a custom autocollimator, a grating, an autostigmatic microscope, and a precision stage. Uncertainty in LED wavelength is reduced by using a white LED and a set of narrow-band filters. The autocollimator is designed to allow for rapid focus adjustment at each test wavelength. Examples of the measurement technique and an error analysis are provided.

Original languageEnglish (US)
Title of host publicationOptical System Alignment, Tolerancing, and Verification XIII
EditorsJose Sasian, Richard N. Youngworth
PublisherSPIE
ISBN (Electronic)9781510637825
DOIs
StatePublished - 2020
EventOptical System Alignment, Tolerancing, and Verification XIII 2020 - Virtual, Online, United States
Duration: Aug 24 2020Sep 4 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11488
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceOptical System Alignment, Tolerancing, and Verification XIII 2020
CountryUnited States
CityVirtual, Online
Period8/24/209/4/20

Keywords

  • Cell-phone camera
  • Focal length measurement
  • Miniature lenses

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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