A previously proposed phenomenological model of the beam spread function in seawater is extended to include dependence on the asymmetry parameter of the scattering phase function.
KEYWORDS: Ocean optics, Signal attenuation, Scattering, Fluctuations and noise, Data modeling, Autoregressive models, Laser scattering, Inspection, Point spread functions, Information operations
A phenomenological model of the beam spread function is fitted to
Duntley's measurements in artificial seawater in the turbidity range 0.60 less than or equal to s/α less than or equal to 0.83 which is constructed by first delineating the angle-dependence of the curves of the irradiance distribution for given radial distance and then obtaining the radial dependence of their scaling by normalizing to the total spherical-cap integral. The paraseters of the sodel are all easily identified graphically and therefore lend themselves readily to physical interpretation. The agreesent of the sodel with the data is excellent, and it is expected that it should extrapolate well not only to all distances and angles but also to values of the turbidity s/u well outside of the range of the data, including the high-turbidity halt 0.9 s/α 1.
The effect of one-dimensional sinusoidal and trochoidal waves on the
imaging of a submerged object is compared, Images were computed for
crest-to-trough wave heights of 1/4 to 1 times the maximum possible value of
1/7, where 1 is the wavelength, and for wavelengths varying from 0.3 to 10
times the diameter of the object d for the passage of one period of the wave
through the imaging frame for looking straight down. It is found that the
slope discontinuity or near-discontinuity at the crest of the trochoidal wave
results in a greater tendency toward fission of the image than is the case for
the sinusoidal wave.
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