Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical Unsteady Pressure Sensor

Yoshinori Oka; Takayuki Nagata; Miku Kasai; Yuta Ozawa; Keisuke Asai; Taku Nonomura

doi:10.3390/s22176401

Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical Unsteady Pressure Sensor

Sensors (Basel). 2022 Aug 25;22(17):6401. doi: 10.3390/s22176401.

Authors

Yoshinori Oka¹, Takayuki Nagata¹, Miku Kasai¹, Yuta Ozawa¹, Keisuke Asai¹, Taku Nonomura¹

Affiliation

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

Abstract

We developed and evaluated an anodized-aluminum pressure-sensitive paint (AA-PSP) with new formulations of free-base porphyrin, H2TCPP, as an optical unsteady pressure sensor. The luminophore H2TCPP has quite a short fluorescent lifetime (2.4 ns on the condition of the AA-PSP). The fluorescence spectroscopy result shows that the excitation wavelength of H2TCPP corresponds to violet-colored (425 nm) and green-colored (longer than 520 nm) lights. The pressure sensitivity is sufficiently high for the pressure sensor (0.33-0.51%/kPa) and the temperature sensitivity is very low (0.07-1.46%/K). The photodegradation of the AA-PSPs is not severe in both excitation light sources of the green LED and the Nd:YAG laser. The resonance tube experiment result shows the cut-off frequency of the AA-PSPs is over 9.0 kHz, and the results of the shock tube experiment show the 10 µs order time constant of the normal shock wave.

Keywords: H2TCPP; anodized aluminum; chemical adsorption; fast responsiveness; pressure-sensitive paint.

Abstract

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