Abstract

Doppler-broadened Fabry-Perot fringes of weak (<1-kR) auroral [OI] 5577- and 6300-Å emissions have been detected in real time (1/60 sec) with the aid of a low-light level image-orthicon TV camera coupled to a two-stage image intensifier. The imaging scheme permits static-mode operation of a Fabry-Perot interferometer. For maximum use of all the information contained in every TV frame, each circular fringe may be sectioned into several annuli, and the corresponding annuli from all rings are summed to yield an intensity value. This procedure for deriving a fringe profile requires a video digitizer coupled to a digital processing system and should provide fast real-time (1/60 sec) measurements of E- and F-region temperatures and winds. A more restricted analysis of the TV images involves analog display of the intensity distribution along a few raster lines. Since only a minute fraction of the total signal is thus utilized to derive a fringe profile, image integration on the TV camera is necessary to assure a high SNR of the profile. With [OI] 5577-Å intensity of ∼750 R, visually prominent TV images of the Fabry-Perot fringes were recorded in 0.5 sec, and the temperature of the emitting region was determined from ∼ 2% of the total information in the TV image.

© 1980 Optical Society of America

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References

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  1. G. Hernandez, R. G. Roble, J. Geophys. Res. 81, 2065 (1976).
    [CrossRef]
  2. G. J. Hernandez, O. A. Mills, Appl. Opt. 12, 126 (1973).
    [CrossRef] [PubMed]
  3. R. G. Roble, “A Theoretical and Experimental Study of the Stable Mid-Latitude Red Arc (SAR-arc),” Ph.D. Thesis, U. Michigan, Ann Arbor (1969).
  4. L. L. Cogger, “A Mutichannel Fabry-Perot Spectrometer for Atmospheric Studies,” Ph.D. Thesis, U. Saskatchewan (1968).
  5. V. J. Abreu, J. L. Manning, “Image Dissector Studies of the Off-Axis Behavior of a Fabry-Perot Interferometer,” U. Michigan Report 0313716-T-3 (1977).
  6. G. G. Sivjee, G. J. Romick, M. H. Rees, Astrophys. J. 229, 432 (1979).
    [CrossRef]
  7. F. A. Jenkins, H. E. White, Fundamentals of Optics (McGraw-Hill, New York, 1957), p. 278.

1979 (1)

G. G. Sivjee, G. J. Romick, M. H. Rees, Astrophys. J. 229, 432 (1979).
[CrossRef]

1976 (1)

G. Hernandez, R. G. Roble, J. Geophys. Res. 81, 2065 (1976).
[CrossRef]

1973 (1)

Abreu, V. J.

V. J. Abreu, J. L. Manning, “Image Dissector Studies of the Off-Axis Behavior of a Fabry-Perot Interferometer,” U. Michigan Report 0313716-T-3 (1977).

Cogger, L. L.

L. L. Cogger, “A Mutichannel Fabry-Perot Spectrometer for Atmospheric Studies,” Ph.D. Thesis, U. Saskatchewan (1968).

Hernandez, G.

G. Hernandez, R. G. Roble, J. Geophys. Res. 81, 2065 (1976).
[CrossRef]

Hernandez, G. J.

Jenkins, F. A.

F. A. Jenkins, H. E. White, Fundamentals of Optics (McGraw-Hill, New York, 1957), p. 278.

Manning, J. L.

V. J. Abreu, J. L. Manning, “Image Dissector Studies of the Off-Axis Behavior of a Fabry-Perot Interferometer,” U. Michigan Report 0313716-T-3 (1977).

Mills, O. A.

Rees, M. H.

G. G. Sivjee, G. J. Romick, M. H. Rees, Astrophys. J. 229, 432 (1979).
[CrossRef]

Roble, R. G.

G. Hernandez, R. G. Roble, J. Geophys. Res. 81, 2065 (1976).
[CrossRef]

R. G. Roble, “A Theoretical and Experimental Study of the Stable Mid-Latitude Red Arc (SAR-arc),” Ph.D. Thesis, U. Michigan, Ann Arbor (1969).

Romick, G. J.

G. G. Sivjee, G. J. Romick, M. H. Rees, Astrophys. J. 229, 432 (1979).
[CrossRef]

Sivjee, G. G.

G. G. Sivjee, G. J. Romick, M. H. Rees, Astrophys. J. 229, 432 (1979).
[CrossRef]

White, H. E.

F. A. Jenkins, H. E. White, Fundamentals of Optics (McGraw-Hill, New York, 1957), p. 278.

Appl. Opt. (1)

Astrophys. J. (1)

G. G. Sivjee, G. J. Romick, M. H. Rees, Astrophys. J. 229, 432 (1979).
[CrossRef]

J. Geophys. Res. (1)

G. Hernandez, R. G. Roble, J. Geophys. Res. 81, 2065 (1976).
[CrossRef]

Other (4)

F. A. Jenkins, H. E. White, Fundamentals of Optics (McGraw-Hill, New York, 1957), p. 278.

R. G. Roble, “A Theoretical and Experimental Study of the Stable Mid-Latitude Red Arc (SAR-arc),” Ph.D. Thesis, U. Michigan, Ann Arbor (1969).

L. L. Cogger, “A Mutichannel Fabry-Perot Spectrometer for Atmospheric Studies,” Ph.D. Thesis, U. Saskatchewan (1968).

V. J. Abreu, J. L. Manning, “Image Dissector Studies of the Off-Axis Behavior of a Fabry-Perot Interferometer,” U. Michigan Report 0313716-T-3 (1977).

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Figures (3)

Fig. 1
Fig. 1

Schematic diagram of a static Fabry-Perot interferometer and imaging system.

Fig. 2
Fig. 2

Fabry-Perot fringes of auroral [OI] 5577-Å emission observed with an imaging system. Fringes were integrated on an [IO] photocathode for 0.5 sec. Intensity of 5577-Å emission during the observation period was ∼750 R.

Fig. 3
Fig. 3

Spectral profiles of [OI] 5577-Å and He–Ne laser 6328-Å emissions obtained by summing several TV raster lines passing through the center of fringe patterns. Each point of the horizontal slice was weighted according to its radial distance from the center of the fringe pattern to correct for geometrical differences between polar and Cartesian coordinate systems.

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