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

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2012

J.-j. Wu, J.-b. Chen, A.-c. Xu, X.-y. Gao, and S. Zhuang, “Focal length measurement based on Hartmann–Shack principle,” Optik 123, 485–488 (2012).
[CrossRef]

J. Yang, L. Qiu, W. Zhao, and H. Wu, “Laser differential reflection-confocal focal-length measurement,” Opt. Express 20, 26027–26036 (2012).
[CrossRef]

2011

2009

2008

2006

I. Ilev, “A simple confocal fibre-optic laser method for intraocular lens power measurement,” Eye 21, 819–823 (2006).
[CrossRef]

2005

P. Singh, M. S. Faridi, and R. S. Sirohi, “Measurement of focal length with phase-shifting Talbot interferometry,” Appl. Opt. 44, 1572–1576 (2005).
[CrossRef]

C. J. Tay, M. Thakur, L. Chen, and C. Shakher, “Measurement of focal length of lens using phase shifting Lau phase interferometry,” Opt. Commun. 248, 339–345 (2005).
[CrossRef]

2002

1995

1994

1992

Calogero, D.

Chatterjee, S.

Chen, J.-b.

J.-j. Wu, J.-b. Chen, A.-c. Xu, X.-y. Gao, and S. Zhuang, “Focal length measurement based on Hartmann–Shack principle,” Optik 123, 485–488 (2012).
[CrossRef]

Chen, L.

C. J. Tay, M. Thakur, L. Chen, and C. Shakher, “Measurement of focal length of lens using phase shifting Lau phase interferometry,” Opt. Commun. 248, 339–345 (2005).
[CrossRef]

Dang, L. K.

Faaland, R. W.

Faridi, M. S.

Gao, X.-y.

J.-j. Wu, J.-b. Chen, A.-c. Xu, X.-y. Gao, and S. Zhuang, “Focal length measurement based on Hartmann–Shack principle,” Optik 123, 485–488 (2012).
[CrossRef]

Ilev, I.

I. Ilev, “A simple confocal fibre-optic laser method for intraocular lens power measurement,” Eye 21, 819–823 (2006).
[CrossRef]

Ilev, I. K.

James, R. H.

Kim, D.-H.

Kothiyal, M. P.

Kumarand, Y. P.

Lei, F.

Qiu, L.

Shakher, C.

C. J. Tay, M. Thakur, L. Chen, and C. Shakher, “Measurement of focal length of lens using phase shifting Lau phase interferometry,” Opt. Commun. 248, 339–345 (2005).
[CrossRef]

M. Thakurand and C. Shakher, “Evaluation of the focal distance of lenses by white-light Lau phase interferometry,” Appl. Opt. 41,1841–1845 (2002).
[CrossRef]

Shi, D.

Singh, P.

Sirohi, R. S.

Sriram, K. V.

Tay, C. J.

C. J. Tay, M. Thakur, L. Chen, and C. Shakher, “Measurement of focal length of lens using phase shifting Lau phase interferometry,” Opt. Commun. 248, 339–345 (2005).
[CrossRef]

Thakur, M.

C. J. Tay, M. Thakur, L. Chen, and C. Shakher, “Measurement of focal length of lens using phase shifting Lau phase interferometry,” Opt. Commun. 248, 339–345 (2005).
[CrossRef]

Thakurand, M.

Wilson, T.

T. Wilson, “Confocal microscopy,” in Confocal Microscopy, T. Wilson, ed. (Academic, 1990), Chap. 1, pp. 1–64.

Wu, H.

Wu, J.-j.

J.-j. Wu, J.-b. Chen, A.-c. Xu, X.-y. Gao, and S. Zhuang, “Focal length measurement based on Hartmann–Shack principle,” Optik 123, 485–488 (2012).
[CrossRef]

Xiang, Y.

Xu, A.-c.

J.-j. Wu, J.-b. Chen, A.-c. Xu, X.-y. Gao, and S. Zhuang, “Focal length measurement based on Hartmann–Shack principle,” Optik 123, 485–488 (2012).
[CrossRef]

Yang, J.

Zhao, W.

Zhuang, S.

J.-j. Wu, J.-b. Chen, A.-c. Xu, X.-y. Gao, and S. Zhuang, “Focal length measurement based on Hartmann–Shack principle,” Optik 123, 485–488 (2012).
[CrossRef]

Appl. Opt.

Chin. Opt. Lett.

Eye

I. Ilev, “A simple confocal fibre-optic laser method for intraocular lens power measurement,” Eye 21, 819–823 (2006).
[CrossRef]

Opt. Commun.

C. J. Tay, M. Thakur, L. Chen, and C. Shakher, “Measurement of focal length of lens using phase shifting Lau phase interferometry,” Opt. Commun. 248, 339–345 (2005).
[CrossRef]

Opt. Express

Opt. Lett.

Optik

J.-j. Wu, J.-b. Chen, A.-c. Xu, X.-y. Gao, and S. Zhuang, “Focal length measurement based on Hartmann–Shack principle,” Optik 123, 485–488 (2012).
[CrossRef]

Other

T. Wilson, “Confocal microscopy,” in Confocal Microscopy, T. Wilson, ed. (Academic, 1990), Chap. 1, pp. 1–64.

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