Development and Characterization of a Variable Aperture Attenuation Meter for the Determination of the Small Angle Volume Scattering Function and System Attenuation Coefficient
WESTERN ENVIRONMENTAL TECHNOLOGY LAB INC (WET LABS INC) PHILOMATH OR
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In an effort to characterize the Volume Scattering Function Betatheta in water, WET Labs undertook development of two instruments which can determine and characterize bq in the near forward and wide angles. The Intermediate and Large Angle Scatter Sensor ILASS was developed to provide characterization of betatheta at large forward angles and in the backward direction. This instrument is described in a separate report. The Variable Aperture Beam Attenuation Meter VABAM characterizes the Betatheta in the near forward direction. Work is nearing completion for this instrument. The purpose of this project was to develop a sensor capable of determining appropriate attenuation coefficients to match with specific radiance measurement applications. Furthermore, the instrument will yield information about the shape of the near-forward volume scattering function. These measurements will be obtained with high spectral resolution throughout the visible part of the spectrum. The resultant instrument will be rugged enough to provide quality data for in situ field deployments.
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