z-logo
open-access-imgOpen Access
Laser differential reflection-confocal focal-length measurement
Author(s) -
Jiamiao Yang,
Lirong Qiu,
Weiqian Zhao,
Hualing Wu
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.026027
Subject(s) - optics , focal length , lens (geology) , confocal , cardinal point , laser , physics , materials science
A new laser differential reflection-confocal focal-length measurement (DRCFM) method is proposed for the high-accuracy measurement of the lens focal length. DRCFM uses weak light reflected from the lens last surface to determine the vertex position of this surface. Differential confocal technology is then used to identify precisely the lens focus and vertex of the lens last surface, thereby enabling the precise measurement of the lens focal length. Compared with existing measurement methods, DRCFM has high accuracy and strong anti-interference capability. Theoretical analyses and experimental results indicate that the DRCFM relative measurement error is less than 10 ppm.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here