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Related Concept Videos

Pressure Gauges01:20

Pressure Gauges

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Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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A New Type of High-Sensitivity Fiber Grating Pressure Sensor.

Wei-Chen Li1, Wen-Fung Liu2

  • 1Ph.D. Program of Electrical and Communications Engineering, Feng Chia University, Taichung 40724, Taiwan.

Sensors (Basel, Switzerland)
|May 4, 2026
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Summary
This summary is machine-generated.

We developed a novel fiber Bragg grating (FBG) pressure sensor using an X-shaped transducer. This design enhances stability and sensitivity for accurate measurements in harsh underwater environments.

Keywords:
fiberfiber Bragg gratingpressure sensor

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Area of Science:

  • Optoelectronics
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Fiber Bragg Grating (FBG) sensors are widely used for various sensing applications.
  • Traditional FBG pressure sensors often suffer from bending-induced spectral distortion and limited stability.
  • Developing high-sensitivity and stable pressure sensors is crucial for underwater and harsh environment monitoring.

Purpose of the Study:

  • To propose and experimentally validate a high-sensitivity FBG pressure sensor.
  • To investigate an X-shaped mechanical transducer for converting pressure to axial strain.
  • To optimize sensor design for improved measurement stability and reduced spectral distortion.

Main Methods:

  • Design of an X-shaped mechanical transducer to convert external pressure into axial strain.
  • Development of a theoretical model relating applied force, pressure, and FBG wavelength shift.
  • Experimental optimization of Ethylene Propylene Diene Monomer (EPDM) thickness, bonding materials, and contact area.
  • Performance evaluation of the sensor for force and underwater pressure measurements.

Main Results:

  • Achieved force sensitivities of 0.291 nm/N, 0.409 nm/N, and 0.462 nm/N within 0-10 N.
  • Demonstrated high underwater pressure sensitivity of 0.596 nm/kPa within 0-6 kPa.
  • Exhibited excellent linearity, repeatability, and stability in sensor performance.

Conclusions:

  • The proposed X-shaped transducer effectively converts pressure to axial strain, mitigating bending effects.
  • The developed FBG pressure sensor offers high sensitivity and stability for practical applications.
  • This approach provides a viable solution for high-performance pressure sensing in challenging environments.