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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.8K
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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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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Production of a Strain-Measuring Device with an Improved 3D Printer
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High-sensitivity strain sensor based on in-fiber rectangular air bubble.

Shen Liu1, Kaiming Yang1, Yiping Wang1

  • 1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Scientific Reports
|January 6, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created a novel rectangular air bubble in optical fibers for a high-sensitivity strain sensor. This fiber optic sensor achieves the highest reported strain sensitivity for air-cavity Fabry-Perot interferometers.

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Sensor Technology

Background:

  • Fabry-Perot interferometers (FPI) are widely used for sensing applications.
  • Developing high-sensitivity and low-temperature-sensitivity strain sensors is crucial for various industries.
  • Existing in-fiber FPI strain sensors with air cavities have limitations in sensitivity.

Purpose of the Study:

  • To demonstrate a novel method for creating a rectangular air bubble within a single-mode fiber.
  • To develop a high-sensitivity strain sensor utilizing this unique air bubble structure.
  • To characterize the strain and temperature sensitivity of the proposed sensor.

Main Methods:

  • Splicing two sections of standard single-mode fibers.
  • Tapering the splicing joint to form a unique rectangular air bubble.
  • Utilizing Fabry-Perot interference principles for strain sensing.
  • Measuring the sensor's sensitivity to strain and temperature variations.

Main Results:

  • Successfully fabricated a unique rectangular air bubble in an optical fiber.
  • Developed an in-fiber FPI strain sensor with a cavity length of ~61 μm and wall thickness of ~1 μm.
  • Achieved a record high strain sensitivity of 43.0 pm/με, the highest reported for air-cavity FPI strain sensors.
  • Demonstrated a very low temperature sensitivity of 2.0 pm/°C.
  • Exhibited a low temperature-induced strain measurement error (<0.046 με/°C).

Conclusions:

  • The demonstrated rectangular air bubble structure is highly promising for developing advanced optical strain sensors.
  • The proposed sensor offers superior strain sensitivity compared to existing air-cavity FPI sensors.
  • The sensor's low temperature sensitivity ensures accurate strain measurements in environments with temperature fluctuations.