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Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared

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Absorption coefficient instrument for turbid natural waters.

E Friedman, L Poole, A Cherdak

|March 12, 2010

Summary

A new instrument directly measures the multispectral absorption coefficient in turbid water. This advancement allows for accurate optical property analysis in natural aquatic environments.

Area of Science:

Environmental Science
Optical Physics
Water Quality Monitoring

Background:

Accurate measurement of water optical properties is crucial for understanding aquatic ecosystems.
Existing methods for measuring absorption and scattering coefficients in turbid waters have limitations.
Turbidity and varying light conditions complicate in-situ optical measurements.

Purpose of the Study:

To develop and validate an instrument for direct measurement of the multispectral absorption coefficient in turbid natural waters.
To enable the derivation of spectrally dependent scattering coefficients.
To quantify and correct for systematic errors in optical measurements.

Main Methods:

Development of a novel instrument incorporating compensation for light source intensity variations.

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Implementation of corrections for spectrally dependent optical elements and background light levels.

Utilizing Monte Carlo simulations to estimate systematic errors from multiple scattering.

Main Results:

The developed instrument directly measures the multispectral absorption coefficient in turbid waters.
The system allows for the derivation of spectrally dependent scattering coefficients when coupled with a total attenuation instrument.
Systematic errors, particularly those from multiple scattering, were quantified.

Conclusions:

The new instrument provides a reliable method for assessing the optical properties of turbid natural waters.
Accurate absorption and scattering data are essential for water quality assessment and ecological modeling.
The developed methodology addresses key challenges in in-situ optical measurements of aquatic systems.