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Solid state line scan cameras for measuring strain in soft tissues and implants.

S F Stewart1, D J Lyman, R Benner

  • 1Department of Materials Science and Engineering, University of Utah, Salt Lake City 84112.

Annals of Biomedical Engineering
|January 1, 1989
PubMed
Summary

The line scan camera (LSC) offers an affordable and effective method for optical strain measurement in soft biomaterials. This technique provides accurate, real-time data for various biological and engineering applications.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Optical Measurement Techniques

Background:

  • Soft biomaterials require precise strain measurement for understanding their mechanical properties.
  • Existing optical strain measurement techniques can be costly or complex.

Purpose of the Study:

  • To introduce and evaluate the line scan camera (LSC) as an accessible tool for optical strain measurement.
  • To highlight the advantages and applications of LSC in soft biomaterial analysis.

Main Methods:

  • Utilizing a line scan camera with a linear array of photodiodes for digital image capture.
  • Exploiting the digital nature of the photodiode array for measurements at dark/light interfaces.
  • Conducting mechanical tests on soft biomaterials and elastic models.

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Main Results:

  • LSC demonstrated low cost, high frequency response, and robustness to lighting variations.
  • Achieved relative resolution theoretically limited to 0.1%, with practical results slightly lower.
  • Successfully measured diameter and longitudinal strain in vascular grafts and elastic tubes.

Conclusions:

  • The line scan camera is a versatile, cost-effective, and reliable technique for optical strain measurement of soft biomaterials.
  • LSC is suitable for diverse applications, including vascular biomechanics and pulsatile flow studies.