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Related Concept Videos

Thermal Strain01:19

Thermal Strain

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...
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...
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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...

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Related Experiment Video

Updated: Jun 1, 2026

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
10:52

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

Published on: March 8, 2020

[Development of a simultaneous strain and temperature sensor with small-diameter FBG].

Rong-mei Liu1, Da-kai Liang

  • 1College of Aerospace, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. romme@nuaa.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|May 21, 2011
PubMed
Summary

This study presents a novel fiber Bragg grating (FBG) sensor capable of simultaneously measuring strain and temperature. This small-diameter FBG sensor overcomes cross-sensitivity issues, enabling accurate structural health monitoring.

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Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
10:52

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

Published on: March 8, 2020

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures
04:41

Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures

Published on: September 2, 2019

Area of Science:

  • Optical Engineering
  • Materials Science
  • Sensor Technology

Context:

  • Fiber Bragg gratings (FBGs) are widely used for structural health monitoring.
  • A key challenge is the cross-sensitivity between strain and temperature measurements.
  • Existing FBG sensors often struggle to decouple these two parameters accurately.

Purpose:

  • To design and manufacture a small-diameter FBG (phi80FBG) with reduced cladding diameter (80 microm).
  • To develop a novel scheme for simultaneous strain and temperature sensing using a pair of phi80FBGs.
  • To experimentally validate the sensor's ability to discriminate between strain and temperature.

Summary:

  • A novel scheme utilizing a pair of small-diameter FBGs (phi80FBGs) was developed to overcome the cross-sensitivity between strain and temperature.
  • By strategically placing two FBGs on a uniform strength cantilever (one on the upper surface, one on the lower), strains of equal magnitude but opposite signs were achieved.
  • A matrix equation was employed to decouple and accurately determine both strain and temperature at the sensing point, with experimental errors of 5% for strain and 6% for temperature.

Impact:

  • This research offers a robust solution for accurate, simultaneous strain and temperature measurement in structural health monitoring.
  • The developed phi80FBG sensor technology enhances the reliability of deformation analysis in various engineering applications.
  • The successful experimental validation demonstrates the practical feasibility and effectiveness of the proposed sensing scheme.