Abstract

Luminous line filaments were photographed at the Diamond Island (Lake Winnipesaukee) Station of the Visibility Laboratory at ranges up to 712 water-attenuation lengths. Image widths were 13 mrad or less at ranges from three to six attenuation lengths. It is concluded that optical transmission in natural surface waters may be considered to consist of separable scattered and unscattered light components, and signal processing may be used to alleviate the image deterioration caused by scattering in the water.

© 1965 Optical Society of America

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References

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  1. From data not presented here.
  2. An attenuation length is defined as the distance at which the undisturbed total flux in a beam is reduced to 1/e times its initial value.
  3. S. Q. Duntley, J. Opt. Soc. Am. 53, 214 (1963).
    [Crossref]

1963 (1)

J. Opt. Soc. Am. (1)

Other (2)

From data not presented here.

An attenuation length is defined as the distance at which the undisturbed total flux in a beam is reduced to 1/e times its initial value.

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Figures (6)

F. 1
F. 1

Arrangement used for recording narrow-field images.

F. 2
F. 2

Enlargements of filament images recorded at various ranges, filament length 3 1 4 in.

F. 3
F. 3

Recorded exposure profiles. Curve numbers refer to range in water. 4.0 ft correspond to one attenuation length.

F. 4
F. 4

Absolute values of the volume-scattering function as function of scattering angles for three water samples.

F. 5
F. 5

Integrated scattered flux as a function of cone half-angle for single scattering.

F. 6
F. 6

Ratios of total scattered (solid curves) and total unscattered flux (straight line) on a plane, to initial flux coming from a collimating projector in “clear” sea water, n signifies number of times flux has been scattered. The curves were derived for the case where scattering and absorption coefficients are 60% and 40% of the total attenuation coefficient.