Abstract

In this paper we describe an optical system with one surface aspherized to give a specific level of performance and to equalize the intensity profiles of star images over the field. The system was a 25.4-cm EFL, 5.8° field, f/1.53 catadioptric Cassegrain. It was designed to determine the attitude of a space platform by detecting and mapping the geometric pattern of stars observed to ninth visual magnitude. Aberrations were controlled over a 0.5–1.1-μm spectral region. We compare the polychromatic performance of our design to one conventionally optimized. We also describe how the spherical substrate base radius was chosen to minimize glass removal.

© 1985 Optical Society of America

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References

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  1. L. W. Cassidy, “Advanced Stellar Sensors—A New Generation,” in Technical Digest, Technology for Space Astrophysics Conference: The Next 30 Years. Danbury, Connecticut, 1982, p.164.

Cassidy, L. W.

L. W. Cassidy, “Advanced Stellar Sensors—A New Generation,” in Technical Digest, Technology for Space Astrophysics Conference: The Next 30 Years. Danbury, Connecticut, 1982, p.164.

Other (1)

L. W. Cassidy, “Advanced Stellar Sensors—A New Generation,” in Technical Digest, Technology for Space Astrophysics Conference: The Next 30 Years. Danbury, Connecticut, 1982, p.164.

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Figures (7)

Fig. 1
Fig. 1

Optical schematic of the catadioptric Cassegrain lens system.

Fig. 2
Fig. 2

Prototype of a spacecraft attitude star sensor combining the fast catadioptric lens of Fig. 1 with a focal plane detector array.

Fig. 3
Fig. 3

Transverse aberration plots for the balanced performance lens design.

Fig. 4
Fig. 4

Polychromatic encircled energy as a function of spot diameter for three points in the field of the balanced performance lens design.

Fig. 5
Fig. 5

Transvese aberration plots for the conventionally optimized lens design.

Fig. 6
Fig. 6

Polychromatic encircled energy as in Fig. 4 but for the conventionally optimized lens design.

Fig. 7
Fig. 7

Profile of the nominal aspheric surface referenced to the best fitting sphere over the used annular aperture.

Tables (2)

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Table I Lens Characteristics

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Table II Aspheric Surface Parameters for Two Designs

Equations (1)

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X = C Y 2 1 + ( 1 E C 2 Y 2 ) 1 / 2 + A 4 Y 4 + A 6 Y 6 + A 8 Y 8 + A n Y n ,

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