Nighttime/daytime diffuse attenuation coefficient device for sea

Details Nighttime/daytime diffuse attenuation coefficient device for sea Nighttime/daytime diffuse attenuation coefficient device for sea

1981-06-15

1983-11-22

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

By comparison

250573, 356442, G01N 2117

Patent

active

044165420

ABSTRACT:
An apparatus and method for measuring the diffuse absorption coefficient of seawater provides reliable readings. An emitter of pulsed light is disposed below the water's surface and an irradiance receiver is located between the pulsed light emitter and the water's surface. Because the irradiance receiver is facing downward, is separated from the light emitter a given amount and may be disposed a suitable distance below the water's surface, reliable day and nighttime readings are obtained that are unaffected by atmospheric or surface conditions.

REFERENCES:
patent: 3619624 (1971-11-01), Sorenson
patent: 4037973 (1977-07-01), Carr
patent: 4290695 (1981-09-01), Schmitt
"An Instrument for the Measurement of Spectral Attenuation Coefficient and arrow Angle Volume Scattering Function of Ocean Waters", Austin et al., SPIE, vol. 64, (1975), Ocean Optics, pp. 50-61.

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