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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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A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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An embeddable optical strain gauge based on a buckled beam.

Yang Du1, Yizheng Chen1, Chen Zhu1

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

The Review of Scientific Instruments
|December 3, 2017
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Summary

We developed a novel optical fiber sensor using an extrinsic Fabry-Perot interferometer (EFPI) with a unique strain amplification mechanism. This compact, low-cost sensor accurately measures strain in materials, even in harsh environments.

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Area of Science:

  • Optical Fiber Sensing
  • Mechanical Engineering
  • Materials Science

Background:

  • Accurate strain measurement is crucial for structural health monitoring.
  • Existing sensors can be costly, bulky, or unsuitable for harsh environments.

Purpose of the Study:

  • To develop a low-cost, compact optical fiber sensor for strain measurement.
  • To incorporate a novel strain amplification mechanism for enhanced sensitivity.

Main Methods:

  • Designed an extrinsic Fabry-Perot interferometer (EFPI) sensor utilizing a buckled beam with a gold coating.
  • Integrated the EFPI with a single-mode fiber (SMF) and a ceramic ferrule for support.
  • Implemented a strain amplification mechanism where vertical deflection is 6-17 times axial displacement.

Main Results:

  • Achieved a user-configurable strain amplification mechanism based on buckling beam geometry.
  • Demonstrated a wide range of strain measurement sensitivities.
  • Successfully monitored mortar shrinkage during the drying/curing stage.

Conclusions:

  • The developed EFPI sensor offers a cost-effective and compact solution for strain measurement.
  • The strain amplification mechanism enhances sensor performance and adaptability.
  • The sensor is suitable for long-term embedding in civil materials and structures in harsh environments.