Accession Number : ADA294948

Title :   Comparison of Theoretical Predictions with Field Observations for a Simple Forward Scattering Sensor.

Corporate Author : OREGON STATE UNIV CORVALLIS COLL OF OCEANIC AND ATMOSPHERIC SCIENCES

Personal Author(s) : Kitchen, James C. ; Zaneveld, J. R.

PDF Url : ADA294948

Report Date : 04 NOV 1994

Pagination or Media Count : 21

Abstract : Field measurements with a simple 660 nm forward scattering sensor were analysed by means of a three-layered sphere model of light scattering. The scattering sensor measures a value that represents the scattering function multiplied by a weighting function The geometry of the scattering sensor determines the weighting function. A model was developed that determines the weighting function based on sensor geometry. For the sensor tested the weighting function peaks at 27 degrees with a FWHM of 22 degrees. Measurements with the device were made off the Oregon coast and off San Diego. The device tested displayed segmented linear relationships with the particulate beam attenuation coefficient at 660% and the particulate total scattering coefficient at 488 nm as a function of depth. The slope of the correlation with the particulate beam attenuation coefficient changed by a factor of five over a depth range of 125 meters.

Descriptors :   *LIGHT SCATTERING, *OPTICAL DETECTORS, *FORWARD SCATTERING, MEASUREMENT, COASTAL REGIONS, PREDICTIONS, COMPARISON, THEORY, FIELD TESTS, DEPTH, DISPLAY SYSTEMS, WEIGHTING FUNCTIONS, OCEANOGRAPHIC DATA, CORRELATION, RADIATION ATTENUATION, COEFFICIENTS, SLOPE, GEOMETRY, PARTICULATES, NEPHELOMETERS.

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE