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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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Frequency-modulated impulse response photothermal detection through optical reflectance. 1: Theory.

A Mandelis, J F Power

    Applied Optics
    |June 12, 2010
    PubMed
    Summary

    This study presents a 3-D theory for photothermal detection in opaque solids using surface temperature optical reflectance. It models impulse response and laser source effects for various solid geometries and backing conditions.

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    Area of Science:

    • Physics
    • Materials Science
    • Optical Engineering

    Background:

    • Photothermal detection relies on surface temperature changes.
    • Understanding impulse response is crucial for accurate measurements.
    • Opaque solids present unique challenges in photothermal analysis.

    Purpose of the Study:

    • To present a 3-D theory for impulse response photothermal detection in opaque solids.
    • To extend the theory to account for the finite spatial extent of the laser source.
    • To derive explicit expressions for the time-dependent temperature field.

    Main Methods:

    • Developed a 3-D theory based on surface temperature optical reflectance.
    • Utilized the Green's function as the mathematical equivalent of an optical impulse.
    • Extended the model to include finite laser source dimensions.
    • Analyzed semi-infinite solids and finite-thickness solids with different backings.

    Main Results:

    • Presented a comprehensive 3-D theory for photothermal detection in opaque solids.
    • Successfully incorporated the effects of finite laser source size.
    • Obtained explicit expressions for time-dependent temperature fields.
    • Addressed various boundary conditions relevant to experimental setups.

    Conclusions:

    • The presented 3-D theory provides a robust framework for photothermal detection in opaque solids.
    • The inclusion of laser source extent enhances the applicability of the theory.
    • The derived expressions are valuable for interpreting experimental data in diverse solid configurations.