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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...

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Updated: May 13, 2026

Production of a Strain-Measuring Device with an Improved 3D Printer
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Published on: January 30, 2020

Polymer planar Bragg grating sensor for static strain measurements.

M Rosenberger1, G Koller, S Belle

  • 1Applied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Aschaffenburg 63743, Germany. manuel.rosenberger@h‑ab.de

Optics Letters
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

A novel polymer planar Bragg grating (PPBG) optical strain sensor was developed. This sensor exhibits a linear spectral red shift in response to axial strain, offering precise mechanical load detection.

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Last Updated: May 13, 2026

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Area of Science:

  • Photonics and Materials Science
  • Optical Sensing Technologies

Background:

  • Development of advanced optical strain sensors is crucial for real-time structural health monitoring.
  • Polymer-based optical devices offer advantages in flexibility and cost-effectiveness.

Purpose of the Study:

  • To introduce a new optical strain sensor utilizing a polymer planar Bragg grating (PPBG).
  • To characterize the sensor's performance under axial strain, focusing on wavelength shift and intensity response.

Main Methods:

  • Fabrication of a PPBG sensor using bulk polymethylmethacrylate with a UV-inscribed optical waveguide and Bragg grating in a single step.
  • Application of axial strain and measurement of the resulting Bragg wavelength shift and reflected intensity.

Main Results:

  • The PPBG sensor demonstrated a quasi-instantaneous spectral red shift upon axial strain.
  • A linear relationship was observed between the mechanical load and the Bragg wavelength shift.
  • The sensor achieved a strain sensitivity of 2.95 pm/με.
  • The relative reflected intensity remained constant within the tested load range.

Conclusions:

  • The developed PPBG sensor is a promising tool for accurate and sensitive optical strain measurement.
  • The single-step fabrication process offers a potentially streamlined manufacturing approach.
  • The sensor's stable intensity response enhances its reliability for strain monitoring applications.