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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

1.0K
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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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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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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IR Spectrum01:19

IR Spectrum

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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.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR defect detection in metals.

Chunming Ai1,2, Haichuan Lin1,2, Pingping Sun3

  • 1College of Safety Science and Engineering, Liaoning Technical University, Huludao 125000, China.

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Summary
This summary is machine-generated.

This study demonstrates non-destructive testing using infrared thermal wave technology. Infrared thermography and simulations show temperature changes correlate with component thickness for effective material analysis.

Keywords:
EngineeringHeat transferMaterials scienceNumerical method in materials science

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Area of Science:

  • Materials Science
  • Thermal Physics
  • Non-Destructive Testing

Background:

  • Non-destructive testing (NDT) is crucial for material integrity assessment.
  • Infrared thermal wave technology offers a promising avenue for NDT.
  • Integrating heat transfer theory and image science is key to advancing this technology.

Purpose of the Study:

  • To develop and validate a non-destructive testing method using infrared thermal wave technology.
  • To investigate the relationship between surface temperature distribution and component thickness.
  • To establish the feasibility of using theoretical analysis, numerical simulation, and experimental validation.

Main Methods:

  • Theoretical analysis of heat transfer principles.
  • Finite element numerical simulation using COMSOL.
  • Infrared thermography experiments at varying temperatures (80°C, 106°C, 130°C).
  • Analysis of surface temperature distributions and their correlation with component thickness.

Main Results:

  • Experimental surface temperature distributions were captured and analyzed.
  • A clear correlation between component thickness and temperature response was identified.
  • COMSOL simulations accurately replicated experimental findings, validating the simulation approach.

Conclusions:

  • The integrated approach of heat transfer theory, image science, simulation, and experimentation is effective for NDT.
  • The validated simulation method provides a foundation for promoting infrared thermal wave technology in NDT applications.
  • This research significantly contributes to the field of infrared-based non-destructive testing.