Abstract
Anodized-aluminum pressure-sensitive paint (AA-PSP) has been used as a global pressure sensor for unsteady flow measurements. We use a dipping deposition method to apply a luminophore on a porous anodized-aluminum surface, controlling the luminophore concentration of the dipping method to optimize AA-PSP characteristics. The concentration is varied from 0.001 to 10 mM. Characterizations include the pressure sensitivity, the temperature dependency, and the signal level. The pressure sensitivity shows around 60 % at a lower concentration up to 0.1 mM. Above this concentration, the sensitivity reduces to a half. The temperature dependency becomes more than a half by setting the luminophore concentration from 0.001 to 10 mM. There is 3.6-fold change in the signal level by varying the concentration. To discuss an optimum concentration, a weight coefficient is introduced. We can arbitrarily change the coefficients to create an optimized AA-PSP for our sensing purposes.
Highlights
In aerospace engineering, anodized-aluminum pressure-sensitive paint (AA-PSP) has been used in unsteady flow measurements [1]
Because the gaseous oxygen can be described as a partial pressure of oxygen as well as a static pressure, the luminescence from an AAPSP can be described as a static pressure
The luminophore is applied on the anodized-aluminum surface by the dipping deposition method [3]
Summary
In aerospace engineering, anodized-aluminum pressure-sensitive paint (AA-PSP) has been used in unsteady flow measurements [1]. The luminophore on the anodized-aluminum surface is excited by an illumination source and gives off luminescence. This luminescence is related to gaseous oxygen in a test gas, a process called oxygen quenching. The luminophore is applied on the anodized-aluminum surface by the dipping deposition method [3]. The luminophore concentration may influence the AA-PSP characteristics, because the amount of luminophore on an anodized-aluminum surface may change with the concentration used in the dipping deposition, but the effects of this parameter on AA-PSP have not been studied. Those resultant AA-PSPs can be applied to global measurements in the fields of fluid dynamics, biology, and environmental science. Because PSP in general has a temperature dependency, its relationship to the luminophore concentration was included [4]
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