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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

1.0K
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...
1.0K
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

414
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...
414

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Related Experiment Video

Updated: Jul 11, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Optical fiber strain sensor with high and tunable sensitivity.

Shiwei Yang1, Qiang Zhang1,2, Xiaobo Li1

  • 1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China.

The Review of Scientific Instruments
|November 8, 2023
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Summary
This summary is machine-generated.

This study presents a novel fiber-optic strain sensor achieving unprecedented sensitivity. The tunable Fabry-Perot interferometer offers a cost-effective and robust solution for precise strain measurement.

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Area of Science:

  • Photonics and Optical Sensing
  • Materials Science and Engineering
  • Mechanical Engineering

Background:

  • Fiber-optic sensors offer advantages in harsh environments.
  • Existing fiber-optic strain sensors have limitations in sensitivity and tunability.
  • Fabry-Perot interferometers are suitable for sensing applications.

Purpose of the Study:

  • To develop a fiber-optic strain sensor with significantly enhanced and tunable sensitivity.
  • To explore the relationship between stretching length and strain sensitivity in a Fabry-Perot interferometer.
  • To demonstrate a cost-effective, robust, and reproducible sensor design.

Main Methods:

  • Constructing a Fabry-Perot interferometer with a tunable stretching length.
  • Optimizing the ratio of stretching length to interference length.
  • Experimentally measuring strain sensitivity at different stretching lengths.

Main Results:

  • Achieved a maximum strain sensitivity of 1932 pm/με, an order of magnitude higher than previous sensors.
  • Demonstrated tunable sensitivity from 1932 to 978 pm/με by adjusting stretching length (12 mm to 6 mm).
  • The sensor design is economical, straightforward, robust, and reproducible.

Conclusions:

  • The proposed tunable Fabry-Perot interferometer fiber-optic strain sensor offers superior performance.
  • The device's high and tunable sensitivity makes it promising for practical strain monitoring applications.
  • This advancement contributes to the field of high-performance optical sensing.