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Development of electroluminescence based pressure-sensitive paint system.

Yoshimi Iijima¹, Hirotaka Sakaue

¹Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency, Chofu, Tokyo, Japan. iijima.yoshimi@jaxa.jp

The Review of Scientific Instruments

|February 2, 2011

Summary

A novel electroluminescence-based pressure-sensitive paint (EL-PSP) system offers improved accuracy by reducing temperature dependency. This advanced measurement technique enhances pressure readings and minimizes image errors in aerodynamic studies.

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Area of Science:

Aerodynamics and Fluid Mechanics
Optical Measurement Techniques
Materials Science

Background:

Conventional pressure-sensitive paint (PSP) systems often suffer from temperature dependency, affecting measurement accuracy.
Surface illumination methods, like xenon lamps, can lead to non-uniform lighting and increased temperature effects.
Platinum-porphyrin based PSPs are sensitive to luminescence quenching by oxygen, which is pressure-dependent.

Purpose of the Study:

To introduce and evaluate a new pressure-sensitive paint (PSP) measurement system utilizing electroluminescence (EL) for surface illumination.
To assess the effectiveness of the EL-PSP system in reducing temperature dependency compared to traditional PSP setups.
To demonstrate the system's performance in a practical aerodynamic application, specifically sonic jet impingement.

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Main Methods:

Development of an EL-PSP system comprising an inorganic electroluminescent (EL) light source, a short-pass filter (<500 nm), and a platinum-porphyrin PSP.
Utilizing the short-pass filter to spectrally separate EL illumination from PSP emission.
Characterizing the temperature dependency of both the EL illumination and the PSP under atmospheric conditions.

Main Results:

The EL illumination exhibits an inverse temperature dependency relative to the PSP, aiding in compensation.
The EL source provides uniform illumination, superior to point sources like xenon lamps.
The developed EL-PSP system achieved a 54% reduction in temperature dependency under atmospheric conditions compared to conventional PSP.
Application to sonic jet impingement demonstrated a 75% reduction in temperature dependency for pressure measurements and reduced image misalignment.

Conclusions:

The novel EL-PSP system effectively mitigates temperature-induced errors in pressure measurements.
Uniform illumination from EL sources enhances measurement consistency and accuracy.
This technology shows significant promise for improved aerodynamic testing and flow visualization.