Abstract

The effects of aperture modulation are investigated in a Korean binocular objective lens in isolation from the rest of the system. The axial aberration characteristics are derived through computation from the design data. The MTF is measured for modulated apertures in the presence of axial aberration. The aperture modulation is carried out by providing a mask which has an opaque annulus on an optical flat and is in contact with the lens under test. The MTF varies with the area and the position of the opaque annulus. The MTF of the lens is improved by properly positioning the opaque annulus. The MTF curves with the modulated aperture are also compared with the constricted circular aperture having the same area as the modulated one. The performance of many optical systems can be improved by proper aperture modulation.

© 1983 Optical Society of America

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References

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  1. K. H. Hong, S. S. Lee, J. Korean Phys. Soc. 13, 119 (1980).
  2. K. H. Hong, S. S. Lee, New Physics (Korean) 21, 124 (1981).
  3. F. H. Slaymaker, Appl. Opt. 12, 2709 (1973).
    [CrossRef] [PubMed]

1981

K. H. Hong, S. S. Lee, New Physics (Korean) 21, 124 (1981).

1980

K. H. Hong, S. S. Lee, J. Korean Phys. Soc. 13, 119 (1980).

1973

Hong, K. H.

K. H. Hong, S. S. Lee, New Physics (Korean) 21, 124 (1981).

K. H. Hong, S. S. Lee, J. Korean Phys. Soc. 13, 119 (1980).

Lee, S. S.

K. H. Hong, S. S. Lee, New Physics (Korean) 21, 124 (1981).

K. H. Hong, S. S. Lee, J. Korean Phys. Soc. 13, 119 (1980).

Slaymaker, F. H.

Appl. Opt.

J. Korean Phys. Soc.

K. H. Hong, S. S. Lee, J. Korean Phys. Soc. 13, 119 (1980).

New Physics (Korean)

K. H. Hong, S. S. Lee, New Physics (Korean) 21, 124 (1981).

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Figures (8)

Fig. 1
Fig. 1

Aperture modulation.

Fig. 2
Fig. 2

Longitudinal spherical and chromatic ray aberrations of the binocular objective lens.

Fig. 3
Fig. 3

Optical system for measuring the MTF of an aperture modulated system.

Fig. 4
Fig. 4

MTFs of DAA1, corresponding constricted aperture, and unmodulated full aperture.

Fig. 5
Fig. 5

MTFs of DAA2, corresponding constricted aperture, and unmodulated full aperture.

Fig. 6
Fig. 6

MTFs of DAA3, corresponding constricted aperture, and unmodulated full aperture.

Fig. 7
Fig. 7

MTFs of DAA4, corresponding constricted aperture, and unmodulated full aperture.

Fig. 8
Fig. 8

Aperture modulation effects on the MTF.

Equations (1)

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DAA1 ; the ratio r 1 / r 0 = 0.95 and r 2 / r 0 = 0.30 , DAA2 ; the ratio r 1 / r 0 = 0.90 and r 2 / r 0 = 0.40 , DAA3 ; the ratio r 1 / r 0 = 0.85 and r 2 / r 0 = 0.50 , DAA4 ; the ratio r 1 / r 0 = 0.80 and r 2 / r 0 = 0.60.

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