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Related Concept Videos

Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
Phase Transitions01:21

Phase Transitions

A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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Heating and Cooling Curves02:44

Heating and Cooling Curves

When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
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Phase Changes

Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

The Arrhenius equation,

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
09:10

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Physical mechanism underlying temperature effects on phase retardation.

W Chen1, W Wang, Y Zhang

  • 1State Key Laboratory of Precision Measurement Technology and Instrument, Department of Precision Instruments, Tsinghua University, Beijing, China.

Applied Optics
|July 12, 2012
PubMed
Summary

This study details the physical mechanism behind temperature-dependent phase retardation in wave plates. Understanding refractive index and thickness changes allows for precise retardation calculations, benefiting industrial manufacturing.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Phase retardation in wave plates is crucial for optical applications.
  • Temperature variations can significantly alter wave plate performance.

Purpose of the Study:

  • To elucidate the physical mechanism governing the temperature dependence of phase retardation.
  • To develop a predictive model for phase retardation across different temperatures.

Main Methods:

  • Utilized a novel high-precision instrument to measure phase retardation.
  • Analyzed temperature-dependent changes in refractive index and wave plate thickness.
  • Applied Sellmeier's equation, fitting constants to experimental data.

Main Results:

  • Identified refractive index and thickness variations as key contributors to phase retardation changes.
  • Established a fitting equation based on Sellmeier's equation and experimental data.
  • Demonstrated the ability to calculate phase retardation at any temperature.

Conclusions:

  • The developed model accurately predicts phase retardation based on temperature.
  • Findings have direct implications for optimizing wave plate design and manufacturing processes.
  • Ensures consistent optical performance in variable temperature environments.