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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.
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.
