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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 39, Iss. 6 — Jun. 1, 1949
  • pp: 463–469

Visibility on Cathode-Ray Tube Screens. The Effect of Size and Shape of Pip

N. R. BARTLETT, S. B. WILLIAMS, and R. M. HANES  »View Author Affiliations


JOSA, Vol. 39, Issue 6, pp. 463-469 (1949)
http://dx.doi.org/10.1364/JOSA.39.000463


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Abstract

The area and contour of a stimulus have been indicated experimentally as factors in its visibility. In order to evaluate the role of such factors in radar presentation, an experiment was conducted to determine the effect upon visibility of changes in the size and shape of a radar pip. A wide range of beam widths (which determine the angular dimension of the pip) and pulse lengths (which determine its radial dimension) was investigated at each of three test field brightnesses. Results show that visibility, on a decibel scale, is a linear function of the logarithm of beam width at each of the three brightness levels used. For the dim background visibility is also a linear function of the logarithm of pulse length. For the brighter backgrounds, on the other hand, visibility is shown to be a curvilinear function of the logarithm of pulse length. It is suggested that the reason for the difference between an increase in beam width and an increase in pulse length lies in the time factor. Doubling the beam width, for example, results in a greater increase in the time during which the pip is exposed to the eye than does a corresponding increase in the pulse length.

Citation
N. R. BARTLETT, S. B. WILLIAMS, and R. M. HANES, "Visibility on Cathode-Ray Tube Screens. The Effect of Size and Shape of Pip," J. Opt. Soc. Am. 39, 463-469 (1949)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-39-6-463


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References

  1. S. B. Williams and N. R. Bartlett, "Visibility on cathoderay tube screens: Problems and methods," J. Psych. 25, 401 (1948).
  2. Lamar, Hecht, Shlaer, and Hendley, "Size, shape and contrast in detection of targets by daylight vision. I. Data and analytical description," J. Opt. Soc. Am. 37, 531 (1947).
  3. R. H. Brown, "Spatial effects in human visual resolution," J. Gen. Psychol. 35, 77 (1946).
  4. R. H. Brown and J. I. Niven, "The relation between the foveal intensity threshold and the length of an illuminated slit," J. Exper. Psych. 34, 464 (1944); J. I. Niven and R. H. Brown, "Visual resolution as a function of intensity and exposure time in the human fovea," J. Opt. Soc. Am. 34, 738 (1944).
  5. A. L. Sweet and N. R. Bartlett, "Visibility on cathode-ray tube screens: Signals on a P7 screen seen at different intervals after excitation," J. Opt. Soc. Am. 38, 329 (1948).
  6. R. G. Hopkinson, "Visibility of cathode-ray-tube traces in radar displays," J. Inst. Elec. Eng. 93, 795 (1946).
  7. R. Payne-Scott, "The visibility of small echoes on radar PPI displays," Proc. Inst. Radio Eng. 36, 180 (1948).
  8. Williams, Bartlett, and King, "Visibility on cathode-ray tube screens: Screen brightness," J. Psych. 25, 455 (1948).
  9. A. L. Sweet and N. R. Bartlett, "Visibility on cathode-ray tube screens: Signals on a P7 screen exposed for different intervals," (Manuscript in preparation).

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