Abstract

An f/8, chopped, dual beam, gyroscopically pointed telescope has been constructed for use in obtaining infrared (7–13 μ) observations of the spectrum of the thermal emission of the solar corona. The instrument employs a scanning Michelson interferometer with germanium beam splitter and a germanium bolometer operated at 2 K. A small general purpose digital computer is used for experiment control and data processing. The computer, using reference signals from the chopper, controls the position of the moving interferometer mirror (through a stepper motor), and the operation of an A/D converter enabling rapid measurements of the bolometer output to be made. Synchronous detection, necessary to minimize sky background radiation, is accomplished within the computer. The resulting interferograms are stored on magnetic tape for future processing and displayed on an xy recorder. A fourier transformed spectrum may be generated on operator request in nearly real time.

© 1970 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. L. Mertz, Transformations in Optics (Wiley, New York, 1965).
  2. J. M. Dowling, Proceedings of 1970 International Conference on Fourier Spectroscopy (in press).
  3. W. G. Mankin, R. M. MacQueen, R. H. Lee, unpublished data, 1970.
  4. R. W. Shorthill, J. M. Saari, Ann. N. Y. Acad. Sci. 123, 722 (1965).
    [CrossRef]
  5. J. Connes, P. Connes, J. Opt. Soc. Amer. 56, 896 (1966).
    [CrossRef]

1966

J. Connes, P. Connes, J. Opt. Soc. Amer. 56, 896 (1966).
[CrossRef]

1965

R. W. Shorthill, J. M. Saari, Ann. N. Y. Acad. Sci. 123, 722 (1965).
[CrossRef]

Connes, J.

J. Connes, P. Connes, J. Opt. Soc. Amer. 56, 896 (1966).
[CrossRef]

Connes, P.

J. Connes, P. Connes, J. Opt. Soc. Amer. 56, 896 (1966).
[CrossRef]

Dowling, J. M.

J. M. Dowling, Proceedings of 1970 International Conference on Fourier Spectroscopy (in press).

Lee, R. H.

W. G. Mankin, R. M. MacQueen, R. H. Lee, unpublished data, 1970.

MacQueen, R. M.

W. G. Mankin, R. M. MacQueen, R. H. Lee, unpublished data, 1970.

Mankin, W. G.

W. G. Mankin, R. M. MacQueen, R. H. Lee, unpublished data, 1970.

Mertz, L.

L. Mertz, Transformations in Optics (Wiley, New York, 1965).

Saari, J. M.

R. W. Shorthill, J. M. Saari, Ann. N. Y. Acad. Sci. 123, 722 (1965).
[CrossRef]

Shorthill, R. W.

R. W. Shorthill, J. M. Saari, Ann. N. Y. Acad. Sci. 123, 722 (1965).
[CrossRef]

Ann. N. Y. Acad. Sci.

R. W. Shorthill, J. M. Saari, Ann. N. Y. Acad. Sci. 123, 722 (1965).
[CrossRef]

J. Opt. Soc. Amer.

J. Connes, P. Connes, J. Opt. Soc. Amer. 56, 896 (1966).
[CrossRef]

Other

L. Mertz, Transformations in Optics (Wiley, New York, 1965).

J. M. Dowling, Proceedings of 1970 International Conference on Fourier Spectroscopy (in press).

W. G. Mankin, R. M. MacQueen, R. H. Lee, unpublished data, 1970.

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 (7)

Fig. 1
Fig. 1

Optical diagram of two-beam infrared radiometer and interferometer.

Fig. 2
Fig. 2

Scanning Michelson interferometer for coronal observations.

Fig. 3
Fig. 3

Instrument mounted on its gyro controlled two-axis gimbal support.

Fig. 4
Fig. 4

Block diagram of the data handling system. AC—Accumulator register in computer; D/B IN—data break input to computer; D/B OUT—data break output from computer; PI—program interrupt; IOT—control signals originated by program.

Fig. 5
Fig. 5

Output of detector with interferometer stepped rapidly, showing chopped and dc interferograms.

Fig. 6
Fig. 6

Spectrum of region of moon near the crater Kepler.

Fig. 7
Fig. 7

Comparison of noise from detector and fluctuations in thermal emission of sky.

Metrics