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Scattering And Absorption of Light in Planetary Regoliths

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Calibrated near-forward volume scattering function obtained from the LISST particle sizer.

Wayne H Slade, Emmanuel S Boss

|June 12, 2009

Summary

This study calibrates the Laser In Situ Scattering and Transmissometry (LISST) instrument to measure the full volume scattering function (VSF) of aquatic particles. The calibrated LISST provides accurate VSF magnitude and shape for improved optical property measurements.

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Area of Science:

* Aquatic optics
* Optical oceanography
* Particle scattering

Background:

* The volume scattering function (VSF) is a critical inherent optical property governing light scattering by particles in aquatic environments.
* Measuring the full VSF in situ has been challenging due to the lack of commercial instrumentation.
* The Laser In Situ Scattering and Transmissometry (LISST) instrument is commonly used for particle size distribution (PSD) retrieval but not for full VSF measurement.

Purpose of the Study:

* To calibrate the LISST instrument for accurate measurement of the near-forward volume scattering function (VSF).
* To validate the LISST's capability in determining both the magnitude and shape of the VSF.
* To enable field measurements of VSF for aquatic particle characterization.

Main Methods:

* Analysis of light scattering by well-characterized polystyrene bead suspensions.
* Empirical comparison of LISST scattering data with Mie theory predictions.
* Development of instrument-specific scaling factors for VSF retrieval.

Main Results:

* A set of instrument-specific scaling factors were derived to accurately retrieve the VSF magnitude.
* Validation confirmed that the LISST, when calibrated, can accurately represent the shape of the VSF.
* The study provides a method to utilize the LISST for quantitative VSF measurements.

Conclusions:

* The LISST instrument can be calibrated to accurately measure the near-forward volume scattering function (VSF) of aquatic particles.
* This calibration allows for improved characterization of particle optical properties in situ.
* The findings facilitate more reliable VSF measurements in aquatic environments using existing LISST technology.