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Related Concept Videos

Thermal Strain01:19

Thermal Strain

2.7K
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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Thermosensation01:43

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Thermal Stress01:09

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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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...
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Related Experiment Video

Updated: Dec 22, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Discerning Localized Thermal Heating from Mechanical Strain Using an Embedded Distributed Optical Fiber Sensor

R Brian Jenkins1, Peter Joyce2, Adam Kong1

  • 1Department of Electrical and Computer Engineering, US Naval Academy, 105 Maryland Ave., Annapolis, MD 21402, USA.

Sensors (Basel, Switzerland)
|May 7, 2020
PubMed
Summary

Distributed optical fiber sensors (DOFS) can detect high temperatures in composites. This study developed a method to distinguish thermal signals from strain, improving localized temperature measurement for structural health monitoring.

Keywords:
distributed optical fiber sensorshigh energy radiationpolymer matrix compositessmart structuresstrain compensationstrain sensorsstructural health monitoringtemperature sensors

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Composite Engineering

Background:

  • Distributed optical fiber sensors (DOFS) using Rayleigh scattering detect high temperatures (approaching 1000 °C) in composite structures.
  • Mechanical strain in composites interferes with accurate temperature measurements from DOFS.
  • Simultaneous temperature and strain detection by DOFS complicates analysis of thermal events.

Purpose of the Study:

  • To develop a method for isolating and measuring localized thermal responses in carbon fiber/epoxy composites.
  • To mitigate the interference of mechanical strain on temperature measurements using DOFS.
  • To enhance the rapid detection of thermal impulses in structural health monitoring applications.

Main Methods:

  • Embedding a distributed optical fiber sensor (DOFS) network within a carbon fiber/epoxy composite.
  • Subjecting the composite to cyclic bending strain and a localized low-energy laser strike.
  • Implementing a signal processing technique to enhance thermal response while suppressing strain effects.

Main Results:

  • Demonstrated simultaneous detection of temperature and strain by the embedded DOFS.
  • Successfully isolated and measured the localized thermal response under cyclic bending strain.
  • The signal processing technique effectively enhanced the thermal signal and mitigated strain interference.

Conclusions:

  • A novel method allows for accurate, localized temperature measurement in composites under strain.
  • This technique improves the reliability of DOFS for detecting thermal events in structural health monitoring.
  • The approach has potential applications in monitoring temperature-sensitive components and smart structures.