Okudera Tomohiro, Nagata Takayuki, Kasai Miku, Saito Yuji, Nonomura Taku, Asai Keisuke
Department of Aerospace Engineering, Tohoku University, Sendai 980-8579, Japan.
Sensors (Basel). 2021 Feb 4;21(4):1062. doi: 10.3390/s21041062.
The effects of the oxygen mole fraction on the static properties of pressure-sensitive paint (PSP) were investigated. Sample coupon tests using a calibration chamber were conducted for poly(hexafluoroisopropyl methacrylate)-based PSP (PHFIPM-PSP), polymer/ceramic PSP (PC-PSP), and anodized aluminum PSP (AA-PSP). The oxygen mole fraction was set to 0.1-100%, and the ambient pressure (Pref) was set to 0.5-140 kPa. Localized Stern-Volmer coefficient Blocal increased and then decreased with increasing oxygen mole fraction. Although Blocal depends on both ambient pressure and the oxygen mole fraction, its effect can be characterized as a function of the partial pressure of oxygen. For AA-PSP and PHFIPM-PSP, which are low-pressure- and relatively low-pressure-type PSPs, respectively, Blocal peaks at PO2ref<12 kPa. In contrast, for PC-PSP, which is an atmospheric-pressure-type PSP in the investigated range, Blocal does not have a peak. Blocal has a peak at a relatively high partial pressure of oxygen due to the oxygen permeability of the polymer used in the binder. The peak of SPR, which is the emission intensity change with respect to normalized pressure fluctuation, appears at a lower partial pressure of oxygen than that of Blocal. This is because the intensity of PSP becomes quite low at a high partial pressure of oxygen even if Blocal is high. Hence, the optimal oxygen mole fraction depends on the type of PSP and the ambient pressure range of the experiment. This optimal value can be found on the basis of the partial pressure of oxygen.
研究了氧摩尔分数对压敏漆（PSP）静态性能的影响。使用校准室对基于聚（甲基丙烯酸六氟异丙酯）的PSP（PHFIPM - PSP）、聚合物/陶瓷PSP（PC - PSP）和阳极氧化铝PSP（AA - PSP）进行了样品试片测试。氧摩尔分数设定为0.1 - 100%，环境压力（Pref）设定为0.5 - 140 kPa。局部斯特恩 - 沃尔默系数Blocal随氧摩尔分数增加先增大后减小。尽管Blocal既取决于环境压力又取决于氧摩尔分数，但其影响可表征为氧分压的函数。对于分别为低压型和相对低压型的AA - PSP和PHFIPM - PSP，Blocal在PO2ref < 12 kPa时出现峰值。相比之下，对于在所研究范围内为大气压型的PC - PSP，Blocal没有峰值。由于粘合剂中使用的聚合物的氧渗透性，Blocal在相对较高的氧分压下出现峰值。SPR（即相对于归一化压力波动的发射强度变化）的峰值出现在比Blocal更低的氧分压下。这是因为即使Blocal较高，在高氧分压下PSP的强度也会变得相当低。因此，最佳氧摩尔分数取决于PSP的类型和实验的环境压力范围。这个最佳值可以根据氧分压来确定。
