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Development and characterization of fast responding pressure sensitive microspheres.

Fletcher Kimura1, Miguel Rodriguez, Jesse McCann

  • 1Department of Chemistry, University of Washington, Seattle, Washington 98195, USA.

The Review of Scientific Instruments
|August 7, 2008
PubMed
Summary

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New pressure sensitive paints and microspheres show fast response times for unsteady flow pressure measurements. Osmium-based materials offer promising alternatives for accurate transient pressure determination.

Area of Science:

  • Fluid Dynamics
  • Materials Science
  • Optical Measurement Techniques

Background:

  • Accurate pressure measurement in unsteady flows is crucial for aerodynamic analysis.
  • Traditional pressure sensors can be limited by response time and intrusive nature.
  • Pressure-sensitive paints (PSPs) and microspheres offer non-intrusive optical methods for pressure mapping.

Purpose of the Study:

  • To evaluate the response times of novel pressure-sensitive materials to shockwaves.
  • To determine the suitability of platinum- and osmium-based PSPs and microspheres for unsteady flow applications.
  • To compare the performance of different luminophor-polymer matrix combinations.

Main Methods:

  • Synthesized platinum- and osmium-based PSPs using various polymer matrices (siloxane-polycarbonate, polystyrene).

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  • Prepared PtOEP-doped polystyrene microspheres (PSBeads) and osmium-doped silica microspheres.
  • Measured response times of these materials to transient shockwave-induced pressure changes using high-speed techniques.

    • Main Results:

    • Platinum-based PSPs exhibited response times between 47.2–53.0 µs.
    • Osmium-based PSPs showed response times ranging from 37.6–58.9 µs.
    • Osmium-based silica microspheres had response times of 13.6–18.9 µs, significantly faster than PSBeads (3.15 ms).

    Conclusions:

    • Osmium-based organometallic complexes demonstrate rapid pressure response in both paint and microsphere formulations.
    • The developed osmium-based silicon dioxide microspheres offer a high-speed pressure sensing capability for unsteady flows.
    • These advanced materials show potential for improved transient pressure measurement in aerodynamic and fluid dynamic studies.