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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

1.8K
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...
1.8K
Thermal Strain01:19

Thermal Strain

2.1K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
4.0K
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

273
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
273
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

473
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
473
Stress-Strain Diagram01:10

Stress-Strain Diagram

742
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Updated: Aug 10, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Simultaneous Measurement of Strain and Temperature Distributions Using Optical Fibers with Different GeO2 and B2O3

Shinsaku Hisada1, Utanori Kodakamine2, Daichi Wada1

  • 1Japan Aerospace Exploration Agency, Tokyo 181-0015, Japan.

Sensors (Basel, Switzerland)
|February 11, 2023
PubMed
Summary

This study addresses temperature effects in optical fiber sensors for structural health monitoring. Optimized sensor combinations achieved low errors in simultaneous strain and temperature measurements, validated by error propagation analysis.

Keywords:
distributed measurementerror propagationfiber Bragg gratingoptical fiberstrain and temperature

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Structural Health Monitoring

Background:

  • Temperature fluctuations significantly impact optical fiber sensor accuracy in structural health monitoring.
  • GeO2 and B2O3 doping levels influence sensor sensitivity and cross-sensitivity to strain and temperature.

Purpose of the Study:

  • To investigate the effect of GeO2 and B2O3 doping on optical fiber sensor sensitivity.
  • To develop and validate a method for simultaneous strain and temperature measurement with high accuracy.
  • To analyze error sources affecting simultaneous measurements using error propagation analysis.

Main Methods:

  • Utilized four types of optical fiber sensors with varying doping concentrations.
  • Performed four-point bending tests to measure strain and temperature distributions.
  • Applied error propagation analysis to experimental data to identify and quantify error factors.

Main Results:

  • The optimal sensor combination yielded low errors: 28.4 μϵ for strain and 1.52 °C for temperature.
  • Experimental results showed good agreement with predictions from the error propagation analysis.
  • Identified key error factors influencing the accuracy of simultaneous measurements.

Conclusions:

  • The developed method effectively compensates for temperature effects in optical fiber sensing.
  • Error propagation analysis is a reliable tool for validating accuracy and understanding error sources.
  • Optimized optical fiber sensor configurations are crucial for precise structural health monitoring.