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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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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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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Applications of IR Spectroscopy: Overview01:11

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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IR Spectrum01:19

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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High-definition Fourier Transform Infrared FT-IR Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology
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3D infrared thermospectroscopic imaging.

A Aouali1,2, S Chevalier1, A Sommier2

  • 1Arts et Métiers Institute of Technology, Université de Bordeaux, CNRS, INRA, INP, I2M, HESAM, Esplanade des Arts et Métiers, 33400, Talence, France.

Scientific Reports
|December 19, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces 3D Infrared Thermospectroscopic Imaging (3DITI), a novel multispectral tomography technique. 3DITI reconstructs 3D thermo-chemical information from complex semi-transparent media, enabling detailed material analysis.

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Area of Science:

  • Spectroscopy
  • Tomography
  • Infrared Imaging

Background:

  • Multispectral imaging provides detailed spectral information.
  • Tomography reconstructs 3D structures from 2D projections.
  • Infrared thermography offers non-contact temperature and chemical composition analysis.

Purpose of the Study:

  • To develop and validate a 3D multispectral tomography technique in the middle wavelength infrared (MWIR) range.
  • To reconstruct 3D spatial cubes of absorptivity and proper emission from semi-transparent materials.
  • To demonstrate the capability of the technique for rapid, high-resolution 3D thermo-chemical imaging.

Main Methods:

  • Utilized a middle wavelength infrared (MWIR) camera (1.5–5.5 μm) and a multispectral IR monochromator (400 nm–20 μm).
  • Employed a sample on a rotary stage to acquire transmittance projections at multiple angular positions.
  • Reconstructed 3D absorptivity and emission cubes using a back-projection method based on inverse Radon transform.

Main Results:

  • Successfully performed rapid IR absorptivity tomography of a metallic screw in under 1 minute.
  • Obtained 3D absorptivity and emission tomographies of a burner flame and microfluidic PFA tubing with water and ethanol.
  • Demonstrated the ability to capture detailed 3D thermo-chemical information in complex semi-transparent media.

Conclusions:

  • The 3D Infrared Thermospectroscopic Imaging (3DITI) method effectively provides 3D thermo-chemical data for complex semi-transparent media.
  • The technique enables rapid, high-resolution 3D reconstruction of material properties.
  • The method generates large datasets, presenting challenges in data acquisition, storage, and processing.