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Related Concept Videos

Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Thermal Stress01:09

Thermal Stress

If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
Thermal Strain01:19

Thermal Strain

Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...

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Related Experiment Video

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Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
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Adaptive optics model for thermal blooming.

D E Novoseller

    Applied Optics
    |May 22, 2010
    PubMed
    Summary

    A new phenomenological model corrects near-field thermal blooming effects. This research advances understanding and mitigation of thermal blooming in optical systems.

    Area of Science:

    • Optics and Photonics
    • Thermal Physics

    Background:

    • Thermal blooming is a significant issue in high-power optical systems.
    • Near-field effects can complicate blooming predictions and corrections.

    Purpose of the Study:

    • To develop a phenomenological model for correcting near-field thermal blooming.
    • To provide a framework for understanding and mitigating thermal blooming in specific optical regimes.

    Main Methods:

    • Development of a phenomenological model based on physical principles.
    • Mathematical formulation and analysis of thermal blooming phenomena.

    Main Results:

    • The proposed model effectively describes and allows for correction of near-field thermal blooming.
    • Validation of the model against theoretical predictions and experimental data (if applicable).

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    Last Updated: Jun 12, 2026

    Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
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    Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

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    Conclusions:

    • The developed phenomenological model offers a practical approach to near-field thermal blooming correction.
    • This work contributes to improved performance and reliability of optical systems affected by thermal blooming.