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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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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Related Experiment Video

Updated: Jun 1, 2026

Murine Hind Limb Explant Model for Studying the Mechanobiology of Achilles Tendon Impingement
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Path-length resolved reflectance in tendon and muscle.

Chuanmao Fan1, Ali Shuaib, Gang Yao

  • 1Department of Biological Engineering, University of Missouri, Columbia, MO 65211, USA.

Optics Express
|June 7, 2011
PubMed
Summary

Optical reflectance in fibrous tissues like tendons shows angle-independent properties when considering mean path-length, unlike muscles which exhibit additional scattering effects.

Area of Science:

  • Biomedical Optics
  • Tissue Optics
  • Biophysics

Background:

  • Optical diffuse reflectance in fibrous tissues is influenced by fiber orientation and measurement angles.
  • Understanding light propagation in tissues is crucial for optical diagnostic and therapeutic applications.

Purpose of the Study:

  • To investigate the angular dependency of optical diffuse reflectance in tendon and skeletal muscle tissues.
  • To determine if path-length resolved measurements can account for anisotropic scattering in these tissues.

Main Methods:

  • Utilized a low-coherence Mach-Zehnder interferometer to measure path-length resolved optical reflectance.
  • Experimented on ex vivo samples of tendon and skeletal muscle.
  • Analyzed reflectance data as a function of mean optical path-length.

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Last Updated: Jun 1, 2026

Murine Hind Limb Explant Model for Studying the Mechanobiology of Achilles Tendon Impingement
08:19

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Published on: December 8, 2023

Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation
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Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation

Published on: January 27, 2023

Measurement of Healthy and Injured Triceps Surae Morphology
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Main Results:

  • Angular dependency of reflectance was eliminated in tendon tissue when plotted against mean path-length.
  • This observation in tendons aligns with predictions from anisotropic diffuse theory.
  • The same phenomenon was not observed in skeletal muscle, indicating other scattering mechanisms are present.

Conclusions:

  • Mean path-length normalization effectively accounts for angular dependency in anisotropic tendon tissue.
  • Skeletal muscle exhibits more complex light scattering behavior than predicted by simple anisotropic diffusion theory.
  • Further research is needed to elucidate the additional scattering mechanisms in muscle tissue.