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Dielectric Polarization in a Capacitor

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...

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Updated: Apr 6, 2026

Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes

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Published on: June 30, 2019

Surface roughness measurement by depolarization method.

Zhuang Liu, Qize Zhong, Xia Yu

|July 21, 2015

Summary

This summary is machine-generated.

A novel fiber profilometer uses polarization to measure surface roughness and profile simultaneously. This method leverages surface scattering depolarization to accurately quantify roughness characteristics.

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Area of Science:

Optical Engineering
Surface Metrology
Materials Science

Background:

Surface characterization is crucial in various scientific and industrial applications.
Traditional methods for measuring surface profile and roughness are often separate processes.
Developing integrated techniques for simultaneous measurement is highly desirable.

Purpose of the Study:

To develop a fiber profilometer capable of simultaneously measuring surface profile and roughness.
To utilize polarization manipulation and surface scattering depolarization for roughness characterization.
To establish a theoretical model and experimental verification for the proposed technique.

Main Methods:

Development of a fiber profilometer system incorporating polarization manipulation.
Utilizing the depolarization effect of surface scattering to analyze roughness.
Formulating a theoretical model to study the second-order dependence of depolarization on roughness.
Conducting experiments to validate the correlation between depolarization and surface roughness.

Main Results:

Demonstrated the capability of the fiber profilometer to measure both surface profile and roughness concurrently.
Established a quantifiable relationship between surface roughness and the depolarization effect.
Verified the theoretical model through experimental data, confirming the accuracy of the technique.

Conclusions:

The developed fiber profilometer effectively measures surface profile and roughness simultaneously.
Polarization manipulation and depolarization analysis offer a robust method for surface roughness characterization.
This integrated approach provides an efficient and accurate solution for comprehensive surface analysis.