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Effect of Oxygen Mole Fraction on Static Properties of Pressure-Sensitive Paint
Open AccessArticle

Frequency Response of Pressure-Sensitive Paints under Low-Pressure Conditions

Department of Aerospace Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aramakiaza-Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan
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Authors to whom correspondence should be addressed.
Academic Editor: Chelakara S. Subramanian
Sensors 2021, 21(9), 3187; https://doi.org/10.3390/s21093187
Received: 17 March 2021 / Revised: 28 April 2021 / Accepted: 29 April 2021 / Published: 4 May 2021
(This article belongs to the Special Issue Optical Sensors for Flow Diagnostics)
The characteristics of fast-response pressure-sensitive paints (PSPs) in low-pressure conditions were evaluated. Three representative porous binders were investigated: polymer-ceramic PSP (PC-PSP), anodized-aluminum PSP (AA-PSP), and thin-layer chromatography PSP (TLC-PSP). For each PSP, two types of luminophores, Pt(II) meso-tetra (pentafluorophenyl) porphine (PtTFPP) and tris(bathophenanthroline) ruthenium dichloride (Ru(dpp)3), were used as sensor molecules. Pressure sensitivities, temperature sensitivities, and photodegradation rates were measured and evaluated using a pressure chamber. The effect of ambient pressure on the frequency response was investigated using an acoustic resonance tube. The diffusivity coefficients of PSPs were estimated from the measured frequency response and luminescent lifetime, and the governing factor of the frequency response under low-pressure conditions was identified. The results of static calibration show that PC-PSP/PtTFPP, AA-PSP/Ru(dpp)3, and TLC-PSP/PtTFPP have high pressure sensitivities that exceed 4%/kPa under low-pressure conditions and that temperature sensitivity and photodegradation rates become lower as the ambient pressure decreases. Dynamic calibration results show that the dynamic characteristics of PSPs with PtTFPP are dependent on the ambient pressure, whereas those of PSPs with Ru(dpp)3 are not influenced by the ambient pressure. This observation indicates that the governing factor in the frequency response under low-pressure conditions is the lifetime for PC-PSP and TLC-PSP, whereas the governing factor for AA-PSP is diffusion. View Full-Text
Keywords: pressure-sensitive paint; frequency response; low pressure pressure-sensitive paint; frequency response; low pressure
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MDPI and ACS Style

Kasai, M.; Sasaki, D.; Nagata, T.; Nonomura, T.; Asai, K. Frequency Response of Pressure-Sensitive Paints under Low-Pressure Conditions. Sensors 2021, 21, 3187. https://doi.org/10.3390/s21093187

AMA Style

Kasai M, Sasaki D, Nagata T, Nonomura T, Asai K. Frequency Response of Pressure-Sensitive Paints under Low-Pressure Conditions. Sensors. 2021; 21(9):3187. https://doi.org/10.3390/s21093187

Chicago/Turabian Style

Kasai, Miku; Sasaki, Daisuke; Nagata, Takayuki; Nonomura, Taku; Asai, Keisuke. 2021. "Frequency Response of Pressure-Sensitive Paints under Low-Pressure Conditions" Sensors 21, no. 9: 3187. https://doi.org/10.3390/s21093187

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