Abstract

The image-sharpening telescope described in the preceding article was installed and operated on equatorial mounts at both Leuschner Observatory and Lick Observatory. We present measurements of the characteristic speckle change times for stars observed at these locations. We also present sharpened images of Sirius and Arcturus.

© 1977 Optical Society of America

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References

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  1. A. Buffington, F. S. Crawford, R. A. Muller, A. J. Schwemin, and R. G. Smits, “Correction of atmospheric distortion with an image-sharpening telescope,” J. Opt. Soc. Am. 67, 298–303 (1977) (preceding article).
    [Crossref]
  2. R. A. Muller and A. Buffington, J. Opt. Soc. Am. 64, 1200–1210 (1974).
    [Crossref]

1977 (1)

1974 (1)

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Figures (3)

FIG. 1
FIG. 1

Observed distributions of characteristic speckle change times at (a) Leuschner and (b) Lick Observatories. All measurements during a night have been averaged together.

FIG. 2
FIG. 2

Images of Sirius recorded at Leuschner Observatory on the evening of 21 January 1976. The typical value of τ1/2 was 11 to 12 ms. The two curves are normalized to the same area.

FIG. 3
FIG. 3

Images of Arcturus recorded at Lick Observatory on the night of 13–14 July 1976. The typical value of τ1/2 was 10 ms. In (c) the gate threshold was set at twice the average feedback-ON sharpness and allowed data recording during the best 5%–10% of the time. To simulate the averaging effect of a long exposure, the above curves were smoothed by eye with resolution functions of widths ~ 1 2 , 1 10 , 1 10 arc sec, respectively.

Equations (1)

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A ( τ ) = 0 T d t I ( t ) I ( t + τ ) ,