Abstract

A comparison has been made of atmospheric attenuation of brightness contrast data obtained by photographic and by photoelectric processes. The comparison involved the use of a photoelectric telephotometer and a photographic telephotometer of practically the same optical and mechanical design. Atmospheric attenuation of brightness contrast data was obtained for four practically monochromatic regions of the visible spectrum using plane objects subtending the same angle with respect to the point of observation and covering a range of approximately eight miles. The data obtained using the two types of equipment were found to be in close agreement.

© 1949 Optical Society of America

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References

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  1. Coleman, Morris, Rosenberger, and Walker, “A photoelectric method of measuring the atmospheric attenuation of brightness contrast along a horizontal path for the visible region of the spectrum,” J. Opt. Soc. Am. 39, 515–521 (1949).
    [Crossref]

1949 (1)

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Figures (18)

F. 1
F. 1

Schematic diagram of the photoelectric telephotometer.

F. 2
F. 2

Schematic diagram of the photographic telephotometer used in the University of Texas Atmospheric Optics Program.

F. 3
F. 3

Schematic diagram of the grey scale used in the University of Texas Atmospheric Optics Program.

F. 4
F. 4

Telephotograph of the University of Texas visibility targets showing the grey scale used on a day when the meteorological range was 100,000 yards (5:15 p.m., June 27, 1949).

F. 5
F. 5

Data showing linearity of telephotometer.

F. 6
F. 6

Spectral response of photoelectric tube used in telephotometer.

F. 7
F. 7

Light transmission vs. wave-length for violet filter used in telephotometer.

F. 8
F. 8

Light transmission vs. wave-length for blue filter used in telephotometer.

F. 9
F. 9

Light transmission vs. wave-length for green filter used in telephotometer.

F. 10
F. 10

Light transmission vs. wave-length for red filter used in telephotometer.

F. 11
F. 11

Loge of percent apparent contrast vs. range for the violet filter (time—1631 C.S.T.; date—July 18, 1949).

F. 12
F. 12

Loge of percent apparent contrast vs. range for the violet filter (time—1724 C.S.T.; date—July 21, 1949).

F. 13
F. 13

Loge of perent apparent contrast vs. range for the blue filter (time—1701 C.S.T.; date—July 8, 1949).

F. 14
F. 14

Loge of percent apparent contrast vs. range for the blue filter (time—1614 C.S.T.; date—July 8, 1949).

F. 15
F. 15

Loge of percent apparent contrast vs. range for the green filter (time—1645 C.S.T.; date—July 8, 1949).

F. 16
F. 16

Loge of percent apparent contrast vs. range for the green filter (time—1624 C.S.T.; date—July 8, 1949).

F. 17
F. 17

Loge of percent apparent contrast vs. range for the red filter (time—1559 C.S.T.; date—August 13, 1949).

F. 18
F. 18

Loge of percent apparent contrast vs. range for the red filter (time—1632 C.S.T.; date—August 13, 1949).