Abstract

An instrument and technique have been developed for measuring the numerical aperture of a microscope objective to a typical accuracy of 0.0001 compared with about 0.01 for a traditional commercial apertometer.

© 1967 Optical Society of America

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References

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  1. Specification for Photographic Lenses; Definitions, Methods and Accuracy of Marking (British Standards Institution, London, 1963), B.S. 1019.
  2. Methods of Designating and Measuring Apertures and Related Quantities Pertaining to Photographic Lenses (United States of America Standards Institute, New York, 1958), PH 3.29.
  3. P. D. Carman, W. N. Charman, J. Opt. Soc. Am. 54, 1121 (1964).
    [CrossRef]
  4. W. N. Charman, A. Olin, Phot. Sci. Eng. 9, 385 (1965).

1965 (1)

W. N. Charman, A. Olin, Phot. Sci. Eng. 9, 385 (1965).

1964 (1)

Carman, P. D.

Charman, W. N.

W. N. Charman, A. Olin, Phot. Sci. Eng. 9, 385 (1965).

P. D. Carman, W. N. Charman, J. Opt. Soc. Am. 54, 1121 (1964).
[CrossRef]

Olin, A.

W. N. Charman, A. Olin, Phot. Sci. Eng. 9, 385 (1965).

J. Opt. Soc. Am. (1)

Phot. Sci. Eng. (1)

W. N. Charman, A. Olin, Phot. Sci. Eng. 9, 385 (1965).

Other (2)

Specification for Photographic Lenses; Definitions, Methods and Accuracy of Marking (British Standards Institution, London, 1963), B.S. 1019.

Methods of Designating and Measuring Apertures and Related Quantities Pertaining to Photographic Lenses (United States of America Standards Institute, New York, 1958), PH 3.29.

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Figures (2)

Fig. 1
Fig. 1

Schematic arrangement of rotating microscope apertometer S source, objective under test, M microscope, and A rotation axis.

Fig. 2
Fig. 2

The experimental rotating microscope apertometer based on a Wild spectrometer. From left to right: mercury lamp, diffuser, variable iris diaphragm, filter for 546-nm line, dial indicator to check focusing consistency, objective under test, adjustable object point on rotation axis, and microscope.

Tables (1)

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Table I Examples of Numerical Aperture Measurements

Equations (3)

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d ( sin α ) / sin α = - cos 2 α d x / x .
Δ sin α = - sin α cos 4 α ( Δ y ) 2 / x 2 ,
d ( sin α ) = - cos 2 α d Y / x ,

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