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Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
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Large-Diameter Diaphragm Fabry-Pérot Interferometer for High-Sensitivity Temperature Sensing Using a Hermetically Sealed Tunable Medium: Up to 190 nm/K.

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Fabrication and Qualitative Analysis of an Optical Fibre EFPI-Based Temperature Sensor.

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Related Experiment Video

Updated: Jan 16, 2026

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
07:22

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

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Ultrasensitive Pressure Measurement Using an Extrinsic Fabry-Pérot Interferometer (EFPI) Sensor.

Anthony Weir1, Ben Bartlett1, Gerard Dooly1,2

  • 1Center for Robotics and Intelligent Systems (CRIS), Department of Electronic and Computer Engineering, University of Limerick, V94 T9PX Limerick, Ireland.

Sensors (Basel, Switzerland)
|September 27, 2025
PubMed
Summary

This study presents a novel, large-diameter Extrinsic Fabry-Pérot Interferometry (EFPI) fiber optic pressure sensor. It achieves unprecedented sub-Pascal resolution, advancing high-precision sensing for critical applications.

Keywords:
diaphragmextrinsic Fabry–Pérot interferometryoptical fibre sensorpressure sensor

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Area of Science:

  • Optics and Photonics
  • Sensor Technology
  • Materials Science

Background:

  • Extrinsic Fabry-Pérot Interferometry (EFPI) offers potential for high-precision sensing.
  • Development of large-diameter EFPI sensors has been hindered by complex fabrication techniques.
  • Existing EFPI sensors often lack the sensitivity required for detecting minute pressure variations.

Purpose of the Study:

  • To develop and characterize a novel, large-diameter EFPI fiber optic pressure sensor.
  • To investigate various fabrication and diaphragm reduction techniques for EFPI sensors.
  • To establish a new benchmark for EFPI pressure-based systems in terms of sensitivity and resolution.

Main Methods:

  • Fabrication of an 800 μm diameter EFPI with a 7.4 μm diaphragm.
  • Investigation of resin bonding, fusion splicing, and additive manufacturing.
  • Exploration of manual polishing, automated polishing, and hydrofluoric acid etching for diaphragm reduction.

Main Results:

  • Achieved a sub-Pascal resolution of 3.35 mPa.
  • Demonstrated a high sensitivity of 149 nm/kPa.
  • Positioned the sensor among the most sensitive fiber optic pressure sensors developed.

Conclusions:

  • The developed large-diameter EFPI sensor establishes a new benchmark for high-precision pressure sensing.
  • The study provides insights into fabrication and diaphragm reduction methods for future EFPI development.
  • Sub-Pascal resolution opens possibilities in microfluidics, atmospheric monitoring, and medical diagnostics.