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Updated: Jul 12, 2026

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

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Dual-luminophore pressure-sensitive paint measurement using three-gate lifetime method with photodegradation

Kazuki Uchida¹, Kazuyuki Nakakita², Yosuke Sugioka²

¹Department of Aerospace Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan.

The Review of Scientific Instruments

|June 3, 2024

Summary

This study introduces a new method to correct photodegradation in dual-luminophore pressure-sensitive paint (PSP) measurements. The technique improves pressure measurement accuracy by accounting for paint degradation, enhancing the reliability of PSP applications.

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Area of Science:

Aerospace Engineering
Materials Science
Optical Measurement Techniques

Background:

Dual-luminophore pressure-sensitive paint (PSP) is used for aerodynamic measurements.
Previous lifetime-based imaging methods for PSP corrected temperature errors but were susceptible to photodegradation.
Photodegradation compromises the accuracy of PSP measurements over time.

Purpose of the Study:

To develop and validate a photodegradation correction method for dual-luminophore PSP measurements.
To introduce a parameter quantifying PSP photodegradation based on luminophore intensity ratio.
To improve the accuracy of pressure and temperature measurements affected by PSP photodegradation.

Main Methods:

A parameter was introduced to characterize dual-luminophore PSP photodegradation using the intensity ratio of the two luminophores.
Coupon-based calibration tests were conducted to investigate luminescence characteristics and photodegradation.
The proposed correction method was applied to coupon validation and jet impingement tests.

Main Results:

The intensity ratio of the two luminophores effectively characterized PSP photodegradation.
Calibration coefficients for pressure and temperature were corrected using the photodegradation parameter.
Significant improvement in pressure measurement accuracy was observed after applying the correction method.

Conclusions:

The proposed photodegradation correction method effectively enhances the accuracy of dual-luminophore PSP measurements.
The intensity ratio parameter provides a reliable way to quantify PSP paint degradation.
This advancement is crucial for maintaining the integrity of PSP-based aerodynamic and structural health monitoring.