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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

57
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Doppler Effect - II01:05

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Doppler Effect - I00:56

Doppler Effect - I

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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
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Related Experiment Video

Updated: Mar 21, 2026

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Sizing charged particles by phase Doppler anemometry.

L Xie, X Q Dou, Jùn Zhou

    Applied Optics
    |May 4, 2016
    PubMed
    Summary

    Phase Doppler Anemometry (PDA) measurements of charged particles require specific layout configurations. This study identifies effective regions for PDA parameters, enabling accurate particle size and surface conductivity determination.

    Area of Science:

    • Fluid Dynamics
    • Optical Measurement Techniques
    • Particle Characterization

    Background:

    • Phase Doppler Anemometry (PDA) is a widely used optical technique for particle size measurement.
    • Accurate PDA measurements depend critically on the correct configuration of the instrument's layout.
    • Particles frequently acquire electrical charges from various environmental or process-related factors.

    Purpose of the Study:

    • To investigate the optimal selection of PDA layout parameters for accurate measurements of charged particles.
    • To determine the effective regions within the PDA receiver's parameter plane for charged particle analysis.
    • To develop a method for identifying charged particles and quantifying their surface conductivity.

    Main Methods:

    • Analysis of PDA configuration parameter planes for charged particle scenarios.

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  • Theoretical investigation of scattered power attenuation for charged particles.
  • Development of a novel method for identifying charged particles and their surface conductivity.

    • Main Results:

    • Identification of specific effective regions in the PDA receiver's parameter plane for charged particles.
    • Demonstration that linear phase-diameter curves are achieved when parameters are selected from these effective regions.
    • Observation that scattered power attenuation in charged particles is primarily governed by surface conductivity, with minor oscillations related to particle diameter.

    Conclusions:

    • Optimal PDA layout configurations are crucial for accurate measurement of charged particles.
    • The proposed method allows for the identification of charged particles and the estimation of their surface conductivity.
    • This research enhances the capability of PDA for characterizing particles in environments where charging is prevalent.