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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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A High-Strength Strain Sensor Based on a Reshaped Micro-Air-Cavity.

Yanping Chen1,2, Junxian Luo1,2, Shen Liu1,2,3

  • 1Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Sensors (Basel, Switzerland)
|August 23, 2020
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Summary

We developed a robust micro-air-cavity strain sensor using arc discharge. This sensor offers high strength and low thermal sensitivity for accurate strain measurement.

Keywords:
Fabry–Perot interferometerfiber optics sensorsoptical sensing and sensorsstrain sensor

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Area of Science:

  • Optical Fiber Sensors
  • Strain Measurement
  • Micro-Optics

Background:

  • Strain sensors are crucial for structural health monitoring and various industrial applications.
  • Existing sensors often face limitations in terms of strength, measurement range, and thermal cross-sensitivity.

Purpose of the Study:

  • To demonstrate a novel high-strength strain sensor.
  • To investigate the performance characteristics of a micro-air-cavity sensor reshaped via arc discharge.

Main Methods:

  • Fabrication of a micro-air-cavity within a single-mode fiber using repeating arc discharge.
  • Characterization of the sensor's optical properties, including free spectrum range and fringe contrast.
  • Evaluation of strain sensing performance, including sensitivity and measurement range.
  • Assessment of mechanical robustness and thermal sensitivity.

Main Results:

  • The sensor exhibits a broad free spectrum range (~36 nm) and high fringe contrast (~38 dB).
  • Achieved a sensitivity of ~2.39 pm/με and a wide measurement range of 0 to 9800 με.
  • Demonstrated super-high mechanical robustness, withstanding tensile strain up to 10,000 με.
  • Exhibited low thermal sensitivity (<1.0 pm/°C), minimizing temperature cross-sensitivity.

Conclusions:

  • The developed micro-air-cavity strain sensor offers a compelling combination of high strength, wide measurement range, and low thermal sensitivity.
  • The arc discharge reshaping technique is effective for creating robust and high-performance optical strain sensors.