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Related Concept Videos

Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

244
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...
244

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Toward Improvements in Pressure Measurements for Near Free-Field Blast Experiments.

Maylis Lavayssière1, Alexandre Lefrançois1, Bernard Crabos1

  • 1Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Direction des Applications Militaires (DAM), 46500 Gramat, France.

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Summary

This study enhances pressure measurement for air-blast experiments using a modified piezoelectric probe and a deconvolution method. These advancements improve accuracy for high-frequency pressure signals in close-in detonations.

Keywords:
blast experimentclose-in detonationdeconvolutiondynamic calibrationmetrologynear-field experimentationpressure sensorsshock tubetransfer function

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Area of Science:

  • Mechanical Engineering
  • Experimental Physics
  • Shock Wave Phenomena

Background:

  • Accurate pressure measurement is critical in air-blast experiments, especially for close-in detonations (scaled distance < 0.4 m.kg-1/3).
  • Existing pressure probes may face limitations in capturing high-frequency signals characteristic of such events.

Purpose of the Study:

  • To introduce and validate a novel custom-made pressure probe sensor for improved air-blast measurements.
  • To present and evaluate an initial deconvolution method for enhancing pressure signal fidelity.
  • To address the challenges of measuring high-frequency pressure signals in close-in detonation scenarios.

Main Methods:

  • Development of a custom pressure probe with a modified piezoelectric transducer tip.
  • Characterization of the probe's dynamic response (time and frequency) using shock tube and free-field experiments.
  • Implementation of a deconvolution method based on shock tube-determined pencil probe transfer functions.

Main Results:

  • The modified pressure probe demonstrates capability to meet measurement requirements for high-frequency pressure signals.
  • Experimental validation confirms the effectiveness of the probe in laboratory and free-field conditions.
  • Initial results of the deconvolution method show promise for signal processing in air-blast experiments.

Conclusions:

  • The custom-modified probe offers a viable solution for accurate high-frequency pressure measurement in challenging air-blast environments.
  • The deconvolution technique presents a promising approach for further refinement of pressure data.
  • Further research is warranted to fully develop and apply the deconvolution method.