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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.
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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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Updated: Dec 16, 2025

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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An Infrared Defect Sizing Method Based on Enhanced Phase Images.

Yanjie Wei1,2, Zhilong Su1,2, Shuangshuang Mao1,2

  • 1Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China.

Sensors (Basel, Switzerland)
|July 2, 2020
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Summary
This summary is machine-generated.

This study presents an economical infrared thermography (IRT) system for nondestructive evaluation. The developed system effectively detects small defects in composite materials with enhanced image clarity.

Keywords:
composite structuresimage enhancementinfrared thermography

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Area of Science:

  • Materials Science and Engineering
  • Non-Destructive Testing (NDT)
  • Infrared Imaging

Background:

  • Infrared thermography (IRT) is a valuable non-destructive evaluation technique for materials.
  • Existing IRT systems suffer from limitations such as fuzzy image edges, low contrast, and high cost.
  • There is a need for efficient image post-processing and affordable, portable IRT devices.

Purpose of the Study:

  • To develop a convenient and economical inspection system for identifying defects in materials.
  • To improve image quality in IRT by addressing issues of fuzzy edges and low contrast.
  • To create an affordable alternative to traditional infrared thermography systems.

Main Methods:

  • Construction of an economical inspection system utilizing common halogen lamps.
  • Development of an image-processing scheme incorporating Fourier phase analysis.
  • Implementation of specific image enhancement techniques for improved defect visualization.

Main Results:

  • The developed system successfully identified localized defects in glass-fiber-reinforced composite panels.
  • Defects with an effective diameter as small as 5 mm were detected.
  • The system achieved excellent image quality with sharp, clear edges and good contrast.

Conclusions:

  • The developed system offers an economic and effective alternative to traditional infrared thermography.
  • The image-processing scheme significantly enhances defect detection capabilities.
  • The system demonstrates high potential for practical applications in non-destructive evaluation.