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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

1.9K
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...
1.9K

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Coaxial Mach-Zehnder Digital Strain Sensor Made from a Tapered Depressed Cladding Fiber.

Sergio Celaschi1, Nicolas Grégoire2, Younès Messaddeq2

  • 1Centro de Tecnologia da Informação Renato Archer, Campinas 13069-901, Brazil.

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|October 14, 2022
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Summary

A novel digital optical sensor using a tapered fiber Mach-Zehnder interferometer was developed. This sensor accurately measures strain by counting optical power transfer turning points (PTTP), offering a high-resolution digital output.

Keywords:
Mach–Zehnder interferometerdigital optical sensorsfiber opticsfiber optics componentsstrain sensor

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Area of Science:

  • Photonics and Optical Engineering
  • Fiber Optic Sensors
  • Interferometry

Background:

  • Traditional optical sensors often provide analog outputs, requiring complex signal processing.
  • Developing digital optical sensors offers advantages in direct data interpretation and integration.

Purpose of the Study:

  • To propose and demonstrate an in-line digital optical sensor based on a coaxial Mach-Zehnder interferometer.
  • To characterize the performance of biconic tapers for digital optical sensing applications.
  • To fabricate and test a proof-of-concept digital strain sensor.

Main Methods:

  • Modeling and fabrication of a tapered depressed-cladding single-mode fiber as a Mach-Zehnder interferometer.
  • Utilizing optical power transfer turning points (PTTP) in transmission data for digital sensing.
  • Characterization of biconic tapers for PTTP, spectral resolution, extinction ratio, and insertion loss.
  • Experimental validation of an in-line digital strain sensor under tensile load.

Main Results:

  • Successfully modeled and fabricated biconic tapers with desirable optical characteristics.
  • Demonstrated an in-line digital strain sensor with a free spectral range of 1.3 nm.
  • Achieved 96 PTTP under a strain of 707 µm at 1.55 μm wavelength.
  • Obtained a digital resolution of 7.4 µm/PTTP with a quasi-symmetric response to stretch and compression.

Conclusions:

  • The proposed in-line digital optical sensor effectively utilizes PTTP for digital strain measurement.
  • The fabricated sensor demonstrates high resolution and a symmetric response, suitable for practical applications.
  • Tapered fiber Mach-Zehnder interferometers are a viable platform for developing advanced digital optical sensing systems.