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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Measurement technique for determining the temperature distribution in a transparent solid using holographic

A Ito, T Kashiwagi

    Applied Optics
    |May 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Holographic interferometry accurately measures temperature distributions in transparent solids like fused silica and PMMA by analyzing refractive index changes. This method quanties thermal profiles and considers potential errors for reliable results.

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    Area of Science:

    • Materials Science
    • Optical Physics
    • Thermal Analysis

    Background:

    • Accurate temperature measurement is crucial for understanding material behavior under thermal stress.
    • Transparent solids require non-invasive techniques for internal temperature determination.
    • Refractive index is sensitive to temperature variations in materials.

    Purpose of the Study:

    • To demonstrate holographic interferometry for measuring steady-state temperature distributions in transparent solids.
    • To quantify temperature profiles in fused silica and polymethyl methacrylate (PMMA).
    • To analyze and estimate errors in temperature measurements due to optical and thermal effects.

    Main Methods:

    • Utilized holographic interferometry to measure refractive index changes within samples.
    • Applied the technique to fused silica and PMMA samples to determine steady-state temperature distributions.
    • Investigated sources of error, including light refraction and heat losses from the sample surface.

    Main Results:

    • Successfully measured steady-state temperature distributions in fused silica and PMMA.
    • Demonstrated the feasibility of holographic interferometry for thermal profiling of transparent materials.
    • Quantified the impact of refraction and heat losses on measurement accuracy.

    Conclusions:

    • Holographic interferometry is a viable technique for non-invasively mapping temperature distributions in transparent solids.
    • Understanding and estimating errors are essential for precise thermal measurements using this optical method.
    • The technique provides valuable data for material science and thermal engineering applications.