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Simultaneous 3D surface profile and pressure measurement using phase-shift profilometry and pressure-sensitive paint.

Yongzeng Li1, Zhe Dong1, Lei Liang2

  • 1Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

The Review of Scientific Instruments
|April 6, 2021
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Summary

A new method combines 3D surface profiling and pressure measurement using phase-shift profilometry and pressure-sensitive paint (PSP²). This simplified, accurate technique offers high spatial resolution for advanced fluid dynamics research.

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Area of Science:

  • Fluid Dynamics
  • Optical Measurement Techniques
  • Surface Metrology

Background:

  • Traditional 3D pressure-sensitive paint (3D-PSP) methods can be complex and costly.
  • Accurate surface profiling and pressure mapping are crucial for understanding fluid flow phenomena.

Purpose of the Study:

  • To introduce a novel, integrated method for simultaneous 3D surface profile and pressure measurement.
  • To demonstrate the advantages of the new technique over existing 3D-PSP methods, focusing on simplicity, cost-effectiveness, and accuracy.

Main Methods:

  • Integration of phase-shift profilometry with pressure-sensitive paint (PSP) into a single technique, termed PSP².
  • Utilizing a modified digital light-processing (DLP) projector for fringe projection and ultraviolet excitation of PSP.
  • Reconstruction of 3D surface profiles from four phase-shifting emission images and obtaining surface intensity ratio distribution.

Main Results:

  • The PSP² method achieved results comparable to conventional PSP for intensity ratio measurements.
  • High-contrast fringe projection was found to improve surface profile measurement accuracy by mitigating phase distortion.
  • Average total errors between reconstructed 3D surfaces and CAD geometry were consistently below 0.1 mm.

Conclusions:

  • The proposed PSP² method offers a simplified, low-cost, and accurate approach for simultaneous 3D surface and pressure measurement.
  • The technique demonstrates high spatial resolution and minimal interference with PSP coatings.
  • This advancement has significant potential for applications in experimental fluid dynamics and aerodynamic testing.