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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

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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...
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Related Experiment Video

Updated: Jan 22, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

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Multipoint Fiber Loop Ringdown Sensors for Large Strain Measurement Using Frequency-Shifted Interferometry.

Chunfu Cheng1,2, Zehao Chen1,2, Yiwen Ou3,4

  • 1Hubei Collaborative Innovation Center for High-Efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, China.

Sensors (Basel, Switzerland)
|July 4, 2019
PubMed
Summary
This summary is machine-generated.

A new fiber optic strain sensing system uses frequency-shifted interferometry (FSI) to measure strain decay rates. This cost-effective multipoint fiber loop ringdown (FLRD) sensor offers a large measuring range and simple structure.

Keywords:
fiber loop ringdownfrequency-shifted interferometrylarge measuring rangestrain sensor

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Area of Science:

  • Optical sensing technologies
  • Fiber optic sensors
  • Strain measurement systems

Background:

  • Conventional multipoint fiber loop ringdown (FLRD) techniques often require expensive equipment.
  • Existing methods may lack the desired sensitivity or measuring range for certain applications.
  • Developing cost-effective and high-performance strain sensors is crucial for structural health monitoring.

Purpose of the Study:

  • To propose and experimentally validate a novel multipoint fiber loop ringdown (FLRD) strain sensing system.
  • To demonstrate a cost-effective alternative to conventional FLRD techniques using frequency-shifted interferometry (FSI).
  • To achieve a large measuring range and high sensitivity in a simple sensing structure.

Main Methods:

  • A multipoint FLRD strain sensing system was developed using frequency-shifted interferometry (FSI).
  • A serial dual-point system with a biconical tapered multimode fiber (MMF) sensor head was constructed.
  • Strain was applied using translation stages, and the decay rate of continuous wave (CW) light was measured in the space domain.

Main Results:

  • A linear relationship was observed between applied strain and induced optical loss.
  • Static strain sensitivities of 0.13676 dB/mε and 0.19665 dB/mε were achieved.
  • A large measuring range of approximately 6 mε and detection limits of 0.0123 dB and 0.0360 dB were demonstrated.

Conclusions:

  • The proposed FSI-based multipoint FLRD system offers a promising low-cost strain sensing solution.
  • The system exhibits advantages including a simple sensing structure and a large measuring range.
  • This technology has potential applications in structural health monitoring and other fields requiring precise strain detection.