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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 26027–26036

Laser differential reflection-confocal focal-length measurement

Jiamiao Yang, Lirong Qiu, Weiqian Zhao, and Hualing Wu  »View Author Affiliations


Optics Express, Vol. 20, Issue 23, pp. 26027-26036 (2012)
http://dx.doi.org/10.1364/OE.20.026027


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Abstract

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.

© 2012 OSA

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(180.1790) Microscopy : Confocal microscopy
(220.4840) Optical design and fabrication : Testing

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: August 24, 2012
Revised Manuscript: October 16, 2012
Manuscript Accepted: October 23, 2012
Published: November 2, 2012

Citation
Jiamiao Yang, Lirong Qiu, Weiqian Zhao, and Hualing Wu, "Laser differential reflection-confocal focal-length measurement," Opt. Express 20, 26027-26036 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-23-26027


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