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Measurement of Fluid Pressure01:16

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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.
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In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
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Fabry-Perot Interferometer Used to Measure Very Low Static Pressure Measurements.

Sergio Calixto1, Roberto Zitzumbo2, Zacarías Malacara Hernandez1

  • 1Centro de Investigaciones en Óptica, Loma del Bosque 115, Leon 37150, Mexico.

Sensors (Basel, Switzerland)
|July 29, 2023
PubMed
Summary
This summary is machine-generated.

This study adapted the Fabry-Perot interferometer to measure low pressures. The instrument detects pressure changes by observing shifts in interference fringes caused by a silicone membrane

Keywords:
Fabry–Perot interferometerhigh sensitivityoptical sensorphysical sensorpolydimethyl siloxanepressure sensorsensor devicesvery low pressure measurements

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Area of Science:

  • Optical Physics
  • Metrology
  • Instrumentation

Background:

  • Accurate measurement of low pressures is crucial in various scientific and industrial applications.
  • Traditional pressure sensors may have limitations in sensitivity or range for very low pressures.

Purpose of the Study:

  • To adapt and utilize a Fabry-Perot interferometer for the precise measurement of very low pressures.
  • To demonstrate the feasibility of using optical interference patterns for pressure sensing.

Main Methods:

  • Constructed a Fabry-Perot interferometer with high-reflectance mirrors and a metallic chamber.
  • Incorporated a flexible silicone membrane on one chamber face, with a mirror attached.
  • Observed and measured the displacement of concentric circular interference fringes generated by light passing through the mirrors.
  • Correlated fringe displacement with pressure changes within the chamber to create a calibration plot.

Main Results:

  • The adapted Fabry-Perot interferometer successfully detected pressure variations.
  • Minimum measurable pressures were achieved in the range of tens of Pascals.
  • Fringe displacement was directly linked to pressure changes, enabling calibration.

Conclusions:

  • The Fabry-Perot interferometer is a viable optical instrument for measuring very low pressures.
  • The design utilizing a silicone membrane offers a sensitive method for pressure transduction.
  • This technique provides a novel approach for low-pressure metrology.