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Related Concept Videos

Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

The Arrhenius equation,
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Le Chatelier's Principle: Changing Temperature02:19

Le Chatelier's Principle: Changing Temperature

Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:

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Influence of temperature on diffractive lens performance.

G P Behrmann, J P Bowen

    Applied Optics
    |September 8, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Lens thermal properties significantly impact optical system performance. This study compares thermal sensitivity between refractive and diffractive lenses, offering design equations and material data for athermalized lens creation.

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    Area of Science:

    • Optical Engineering
    • Materials Science
    • Thermal Analysis

    Background:

    • Optical system performance is critically dependent on lens thermal properties.
    • Temperature variations, including uniform changes and gradients, can significantly affect lens behavior.
    • Understanding these thermal effects is crucial for designing stable and reliable optical systems.

    Purpose of the Study:

    • To investigate the impact of thermal variations on diffractive lens performance.
    • To compare the thermal sensitivity of diffractive lenses with traditional refractive lenses.
    • To provide practical design equations and material data for thermal management in optical lenses.

    Main Methods:

    • Analysis of uniform temperature changes and thermal gradients on diffractive lens performance.
    • Comparative thermal sensitivity analysis between refractive and diffractive lens types.
    • Development of design equations for focal length, phase coefficients, and diffraction efficiency as functions of temperature.
    • Compilation of thermal data for various lens materials.

    Main Results:

    • Established design equations quantifying the influence of temperature on key lens parameters.
    • Presented comparative data highlighting the thermal sensitivity differences between refractive and diffractive lenses.
    • Identified critical thermal properties of various lens materials.

    Conclusions:

    • Diffractive lenses exhibit distinct thermal behaviors compared to refractive lenses.
    • The presented design equations and material data enable the development of athermalized lenses.
    • Combining refractive and diffractive surfaces using the optothermal expansion coefficient is a viable strategy for thermal compensation.