Abstract

Empirical data for the minimum signal voltage for a pip on a P-7 radar screen have been described as a function of the exposure time of the pip. This has been done for two bias levels for the CRT—a dim scope and a bright scope. From the measurements it is concluded that there is a more marked gain in visibility with increased exposure time for the bright screen than for the dim one, but that on the bright screen visibility probably approaches its maximum at a shorter exposure time. Two turning rates for the sweep were used. And it may be concluded that, for any exposure time or for either brightness of screen (CRT bias) the slower turning rate yields improved signal detection.

© 1949 Optical Society of America

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References

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  1. Williams, Bartlett, and King, J. Psych. 25, 455–466 (1948).
    [Crossref]
  2. A. L. Sweet and N. R. Bartlett, J. Opt. Soc. Am. 38, 329–337 (1948).
    [Crossref] [PubMed]

1948 (2)

Bartlett,

Williams, Bartlett, and King, J. Psych. 25, 455–466 (1948).
[Crossref]

Bartlett, N. R.

King,

Williams, Bartlett, and King, J. Psych. 25, 455–466 (1948).
[Crossref]

Sweet, A. L.

Williams,

Williams, Bartlett, and King, J. Psych. 25, 455–466 (1948).
[Crossref]

J. Opt. Soc. Am. (1)

J. Psych. (1)

Williams, Bartlett, and King, J. Psych. 25, 455–466 (1948).
[Crossref]

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Figures (3)

F. 1
F. 1

Illustration of mechanical technique for varying duration of exposure of the pip (frontal view).

F. 2
F. 2

Visibility, at different times of exposures, for two CRT biases and two rotational speeds.

F. 3
F. 3

Presumed form of the relationship between visibility and exposure time for 7BP7 scope operated with sweep rotating at 6 r.p.m. for two CRT bias levels.

Tables (2)

Tables Icon

Table I Times of exposure, exposure arcs, and turning rates.

Tables Icon

Table II Mean threshold readings for five subjects, expressed as number of decibels of attenuation for a reference signal voltage.