OSA's Digital Library

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


View Full Text Article

Acrobat PDF (1284 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

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

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited