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Related Concept Videos

Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

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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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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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Highly Sensitive Strain Sensor by Utilizing a Tunable Air Reflector and the Vernier Effect.

Farhan Mumtaz1, Muhammad Roman1, Bohong Zhang1

  • 1Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409-0040, USA.

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|October 14, 2022
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Summary

This study introduces a novel, highly sensitive strain sensor using tunable cascaded Fabry-Perot interferometers (FPIs) that leverage the Vernier effect (VE). The sensor achieves significantly enhanced strain sensitivity compared to traditional FPIs, offering robust performance for high-resolution strain monitoring.

Keywords:
Fabry–Perot interferometersVernier effecthollow core fiberstrain sensor

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Area of Science:

  • Fiber optics
  • Optical sensing
  • Interferometry

Background:

  • Fabry-Perot interferometers (FPIs) are widely used in optical sensing.
  • Enhancing the sensitivity of FPI-based sensors is crucial for advanced applications.
  • Cross-talk from environmental factors like temperature can limit strain sensor accuracy.

Purpose of the Study:

  • To propose and experimentally demonstrate a highly sensitive strain sensor.
  • To utilize tunable cascaded FPIs and the Vernier effect (VE) for enhanced strain detection.
  • To achieve high resolution and low temperature sensitivity in strain sensing.

Main Methods:

  • Fabrication of a sensing FPI using a hollow core fiber (HCF) segment between single-mode fibers (SMFs).
  • Construction of a reference FPI with a tunable air reflector controlled by a programmable fiber holder.
  • Experimental validation of the cascaded FPI sensor's performance across a 1530 nm to 1610 nm bandwidth.

Main Results:

  • The cascaded FPI sensor demonstrated optimum strain sensitivities of 23.9 pm/με, 17.54 pm/με, and 14.11 pm/με for different reference FPI cavity lengths.
  • Achieved strain sensitivities were 8.10 to 13.73 times higher than that of a single sensing FPI (1.74 pm/με).
  • Ultra-low temperature sensitivity of 0.49 pm/°C was observed, ensuring effective isolation from temperature-strain cross-talk.

Conclusions:

  • The tunable cascaded FPI sensor offers a significant improvement in strain sensitivity.
  • The sensor's design provides excellent temperature-strain cross-talk isolation.
  • The proposed sensor is a promising candidate for high-resolution, robust, and cost-effective strain sensing applications.