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Hydrostatic force is a fluid's total force at rest on a surface. For a horizontal surface submerged at a fixed depth, the pressure is constant and calculated as the product of fluid density, gravitational acceleration, and depth. In the case of a vertical dam wall submerged in water, this force is not evenly distributed due to the increasing pressure with depth. This variation arises from the cumulative weight of the water above each point. Integration is used to account for the continuous...
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Integration of pressure-sensitive paint with persistent phosphor: A light-charged pressure-sensing system.

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A new light-charged pressure-sensitive paint (LC-PSP) uses long afterglow phosphors for measurements without external light. This innovation simplifies optical systems and enhances pressure measurement accuracy in challenging environments.

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Fluid Dynamics

Background:

  • Traditional pressure-sensitive paints (PSPs) require external light sources for excitation.
  • Inconsistent illumination fields can introduce errors in PSP measurements.
  • Limited optical access in some facilities complicates PSP implementation.

Purpose of the Study:

  • To develop a novel pressure-sensitive paint (PSP) that can be charged by light in advance and measured without an external light source.
  • To optimize the formulation of this light-charged PSP (LC-PSP) for maximum signal level and pressure sensitivity.
  • To demonstrate the capability of the LC-PSP in a practical fluid dynamics experiment.

Main Methods:

  • A new PSP formulation was created by mixing Sr4Al14O25:Eu,Dy phosphor with PtTFPP luminophore in a polyethylene binder.
  • The phosphor particles act as hosts and provide excitation light through their luminescence.
  • Persistent luminescence (green channel) and pressure-sensitive signal (red channel) were utilized, with an intensity ratio correcting for time-varying luminescence.

Main Results:

  • The developed LC-PSP demonstrated pressure sensitivity comparable to typical PSPs.
  • The paint can be charged by UV-LED or sunlight and measured without an external light source.
  • An intensity ratio method effectively removed errors from time-varying persistent luminescence.

Conclusions:

  • The developed LC-PSP offers a simplified optical system for pressure measurements.
  • This technology eliminates errors associated with inconsistent illumination fields.
  • LC-PSP provides a viable solution for PSP applications in environments with limited optical access.