Practical measurement of cell-phone camera lens focal length

Tom D. Milster; William P. Kuhn

doi:10.1117/12.2570622

Practical measurement of cell-phone camera lens focal length

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English (US)
Title of host publication	Optical System Alignment, Tolerancing, and Verification XIII
Editors	Jose Sasian, Richard N. Youngworth
Publisher	SPIE
ISBN (Electronic)	9781510637825
DOIs	https://doi.org/10.1117/12.2570622
State	Published - 2020
Event	Optical System Alignment, Tolerancing, and Verification XIII 2020 - Virtual, Online, United States Duration: Aug 24 2020 → Sep 4 2020

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11488
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Optical System Alignment, Tolerancing, and Verification XIII 2020
Country/Territory	United States
City	Virtual, Online
Period	8/24/20 → 9/4/20

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

Access to Document

10.1117/12.2570622

Cite this

Practical measurement of cell-phone camera lens focal length. / Milster, Tom D.; Kuhn, William P.
Optical System Alignment, Tolerancing, and Verification XIII. ed. / Jose Sasian; Richard N. Youngworth. SPIE, 2020. 1148807 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11488).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Milster, TD & Kuhn, WP 2020, Practical measurement of cell-phone camera lens focal length. in J Sasian & RN Youngworth (eds), Optical System Alignment, Tolerancing, and Verification XIII., 1148807, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11488, SPIE, Optical System Alignment, Tolerancing, and Verification XIII 2020, Virtual, Online, United States, 8/24/20. https://doi.org/10.1117/12.2570622

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Practical measurement of cell-phone camera lens focal length

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

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