Phase maps based on the Lorenz-Mie theory to optimize phase Doppler particle-sizing systems

Area of Science:

• Optical Engineering
• Particle Characterization
• Scattering Theory

Background:

• Phase Doppler particle sizing systems utilize laser interferometry to measure particle size.
• Accurate system setup requires careful selection of parameters like off-axis and elevation angles.
• Existing methods for system optimization can be complex.

Purpose of the Study:

• To develop and validate a theoretical method for optimizing phase Doppler particle sizing systems.
• To demonstrate the utility of phase maps derived from Lorenz-Mie scattering theory for system design.

Main Methods:

• Utilized Lorenz-Mie scattering theory to generate phase maps.
• Theoretically optimized receiving system parameters (off-axis angle, elevation angle, aperture parameters).
• Applied the method to model water droplets, metal particles, and weakly absorbing fluid droplets.

Main Results:

• Phase maps offer a direct, simple, and unambiguous interpretation for system optimization.
• The developed method proved effective for various particle types.
• Optimized system parameters were determined through phase map analysis.

Conclusions:

• Phase maps are a powerful and effective tool for designing and setting up phase Doppler particle sizing systems.
• This theoretical optimization approach simplifies the process of configuring laser-based particle characterization instruments.
• The method is broadly applicable to different particle compositions and optical properties.