Coupled turbidity and spectroscopy problems: a simple algorithm for the volumetric analysis of optically thin or...

Area of Science:

• Optical Physics
• Biophysical Measurement
• Spectroscopy

Background:

• Accurate measurement of phase volume fraction and solute concentration is crucial in various scientific fields.
• Existing methods may have limitations in optically thin or dilute systems.
• Noninvasive in vivo probing requires robust analytical techniques.

Purpose of the Study:

• To develop and validate a novel algorithm for quantifying phase volume fraction and solute concentration in two-phase systems.
• To establish a method applicable to optically thin or dilute, spatially homogeneous systems.
• To explore the algorithm's performance under non-ideal conditions like spatial inhomogeneity and photochemistry.

Main Methods:

• An algorithm based on radiation transfer theory was developed.
• The method utilizes measurements of elastically scattered light (EE) and inelastically scattered light (IE) from probing light.
• Parameters for the algorithm are derived from a training set of measurements.

Main Results:

• The algorithm demonstrates that phase volume and concentration are linear functions of EE and IE signals.
• The study validates the algorithm's applicability to optically thin or dilute homogeneous systems.
• Performance was assessed under conditions of spatial inhomogeneity and light-induced photochemistry.

Conclusions:

• The developed algorithm provides a reliable method for measuring phase volume fraction and solute concentration.
• The linearity of phase volume and concentration with EE and IE signals is a key finding.
• The algorithm shows potential for applications in noninvasive in vivo analysis, such as human skin and tissue analysis.