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Frequency Response of Pressure-Sensitive Paints under Low-Pressure Conditions
Miku Kasai1, Daisuke Sasaki1, Takayuki Nagata1
1Department of Aerospace Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aramakiaza-Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
Sensors (Basel, Switzerland)
|June 2, 2021
Summary
This study evaluated fast-response pressure-sensitive paints (PSPs) under low pressure. Results show specific PSP formulations offer high sensitivity and reduced degradation, with performance varying by luminophore and binder type.
Area of Science:
- Materials Science
- Aerospace Engineering
- Chemical Engineering
Background:
- Fast-response pressure-sensitive paints (PSPs) are crucial for measuring surface pressure in dynamic environments.
- Understanding PSP behavior under low-pressure conditions is vital for applications like high-altitude flight and vacuum systems.
- Existing PSPs require characterization to optimize their performance and reliability in specific operational regimes.
Purpose of the Study:
- To evaluate the performance of fast-response pressure-sensitive paints (PSPs) under low-pressure conditions.
- To investigate the influence of different porous binders (polymer-ceramic, anodized-aluminum, TLC) and luminophores (PtTFPP, Ru(dpp)3) on PSP characteristics.
- To identify the governing factors affecting the frequency response of PSPs at reduced ambient pressures.
Main Methods:
- Static and dynamic calibration of three PSP types (PC-PSP, AA-PSP, TLC-PSP) using two luminophores (PtTFPP, Ru(dpp)3).
- Measurements conducted in a pressure chamber and acoustic resonance tube to assess pressure sensitivity, temperature sensitivity, photodegradation, and frequency response.
- Estimation of diffusivity coefficients from frequency response and luminescent lifetime data.
Main Results:
- PC-PSP/PtTFPP, AA-PSP/Ru(dpp)3, and TLC-PSP/PtTFPP demonstrated high pressure sensitivities (>4%/kPa) under low pressure.
- Temperature sensitivity and photodegradation rates decreased with decreasing ambient pressure for all PSPs.
- PSPs with PtTFPP showed pressure-dependent dynamic characteristics, while Ru(dpp)3-based PSPs were unaffected by ambient pressure.
Conclusions:
- Specific PSP formulations exhibit excellent performance in low-pressure environments, with reduced sensitivity to temperature and light degradation.
- The dynamic response of PSPs under low pressure is governed by luminophore type, with PtTFPP-based paints showing pressure dependency and Ru(dpp)3-based paints exhibiting independence.
- Binder type influences the dominant factor in frequency response: lifetime for PC-PSP and TLC-PSP, and diffusion for AA-PSP, under low-pressure conditions.
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