Abstract

The details of a new design of a fisheye field spectrograph are presented together with performance studies on the prototype. Spectra of different sources together with the microphotometer tracings for the spectra of skylight are given. Details of the calibration are also discussed. The condition for negligible astigmatism, achieved experimentally, has been derived theoretically.

© 1978 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |

  1. S. Q. Duntley, Agard Conf. Proc. No. 183 on Optical Propagation in the Atmosphere, papers presented at the Electromagnetic Wave Propagation Panel Symposium, Lyngby, Denmark, 27–31 October 1975, pp. 39-1 to 39-3.

Duntley, S. Q.

S. Q. Duntley, Agard Conf. Proc. No. 183 on Optical Propagation in the Atmosphere, papers presented at the Electromagnetic Wave Propagation Panel Symposium, Lyngby, Denmark, 27–31 October 1975, pp. 39-1 to 39-3.

Other

S. Q. Duntley, Agard Conf. Proc. No. 183 on Optical Propagation in the Atmosphere, papers presented at the Electromagnetic Wave Propagation Panel Symposium, Lyngby, Denmark, 27–31 October 1975, pp. 39-1 to 39-3.

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (10)

Fig. 1
Fig. 1

Schematic sectional diagram of the fisheye field spectrograph.

Fig. 2
Fig. 2

Skylight spectrum on Kodak Infrared Aerografic film 2424. Wavelength subscripts Fraunhofer and molecule absorption lines.

Fig. 3
Fig. 3

Microdensitometer tracing for skylight spectrum. Scan spot 125 μm, with some outstanding molecule absorption lines.

Fig. 4
Fig. 4

Spectrum of sun and surrounding sky.

Fig. 5
Fig. 5

Dispersion curve obtained with the Spectra Pritchard photometer.

Fig. 6
Fig. 6

Caustics of a spherical mirror, parallel incident light, from infinity (epicycloid) and distances 15, 16, 17.

Fig. 7
Fig. 7

Sectional diagram for deduction of the condition of stigmatism.

Fig. 8
Fig. 8

Functional relation between astigmatic difference and angle t.

Fig. 9
Fig. 9

Enlargement of the stigmatic zone, around the stigmatic angle t0, on the surfaces of spherical mirrors with increasing radii.

Fig. 10
Fig. 10

Functional relation between slit width d, astigmatic differences ΔΔAst for different radii.

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

ϕ ( ) = ϕ ( t ) = r 4 [ sin ( 3 t ) + 3 sin ( t ) 3 cos ( t ) cos ( 3 t ) ] = [ ϕ 1 ( t ) ϕ 2 ( t ) ] t ( 0 , π 2 ) ,
κ ( t ) = ϕ 1 ϕ 2 ϕ 1 ϕ 2 ϕ 3 = ( 3 r 2 ) 2 2 sin 2 ( t ) [ 3 2 r sin ( t ) ] 3 ,
1 κ ( t ) = r m = 3 r 4 sin ( t ) .

Metrics