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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 7 — Aug. 1, 2013

Measuring the lens focal length by laser reflection-confocal technology

Jiamiao Yang, Lirong Qiu, Weiqian Zhao, Rongjun Shao, and Zhigang Li  »View Author Affiliations


Applied Optics, Vol. 52, Issue 16, pp. 3812-3817 (2013)
http://dx.doi.org/10.1364/AO.52.003812


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Abstract

A laser reflection-confocal focal-length measurement (LRCFM) is proposed for the high-accuracy measurement of lens focal length. LRCFM uses the peak points of confocal response curves to precisely identify the lens focus and vertex of the lens last surface. LRCFM then accurately measures the distance between the two positions to determine the lens focal length. LRCFM uses conic fitting, which significantly enhances measurement accuracy by inhibiting the influence of environmental disturbance and system noise on the measurement results. The experimental results indicate that LRCFM has a relative expanded uncertainty of less than 0.0015%. Compared with existing measurement methods, LRCFM has high accuracy and a concise structure. Thus, LRCFM is a feasible method for high-accuracy focal-length measurements.

© 2013 Optical Society of America

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: February 5, 2013
Revised Manuscript: April 23, 2013
Manuscript Accepted: April 24, 2013
Published: May 30, 2013

Virtual Issues
Vol. 8, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Jiamiao Yang, Lirong Qiu, Weiqian Zhao, Rongjun Shao, and Zhigang Li, "Measuring the lens focal length by laser reflection-confocal technology," Appl. Opt. 52, 3812-3817 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-52-16-3812

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