Development of Bi-Luminophore Pressure-Sensitive Paint Systems

Koshi, Mitsuo; Kurita, Minoru; Nakakita, Kazuyuki; Fujii, Keisuke; Watanabe, Shigeya; Katagiri, Shinya; Wada, Yuji

doi:10.1109/iciasf.2007.4380885

Cited by 8 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mixing two luminophores accelerated the photodegradation of the tetranuclear Eu(III) complex under the air atmosphere as reported in the previous studies by Mitsuo et al [ 40 ] and Mochizuki et al [ 41 ]. They used PdTFPP, a palladium porphyrin, as a pressure sensor and poly-IBM-co-TFEM as a binder.…”

Section: Results and Discussionsupporting

confidence: 72%

“…Table 3 compares the present study with those two previous studies by focusing on the degradation rate of the temperature sensor. Mitsuo et al [ 40 ] did not provide the specific value of the degradation rate. Because Mochizuki et al [ 41 ] performed their aging test for only 30 min, the degradation rates at 30 min are shown in the table.…”

Section: Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Photostability Enhancement of Dual-Luminophore Pressure-Sensitive Paint by Adding Antioxidants

Uchida

Ozawa

Asai

et al. 2022

Sensors

View full text Add to dashboard Cite

Antioxidants were applied to a dual-luminophore pressure-sensitive paint (PSP), and the effects on photodegradation caused by exposure to excitation light were studied. Three types of antioxidants that are commonly used for the photostability enhancement of polymers were added to a dual-luminophore PSP, and degradation rates and pressure/temperature sensitivities were investigated by coupon-based tests. One-hour-long aging tests were performed in a pressure chamber with a continuous excitation light source under dry air and argon atmospheres at 100 kPa and 20 ∘C. As a result of the aging tests, a singlet oxygen quencher type antioxidant was found to reduce the degradation rate by 91% when compared with the dual-luminophore PSP without antioxidants. This implies that singlet oxygen has a dominant role in the photodegradation mechanism of the dual-luminophore PSP.

show abstract

Section: Results and Discussionsupporting

confidence: 72%

Section: Results and Discussionmentioning

confidence: 99%

Photostability Enhancement of Dual-Luminophore Pressure-Sensitive Paint by Adding Antioxidants

Uchida

Ozawa

Asai

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…From the point of view of the measurement procedure, Bell et al 8) , Mitsuo et al 7,9) , Yamashita et al 12) and Asai et al 13) reported the modification of the image acquisition procedure in PSP measurements by means of the intensity method. Especially, it is well known that a significant temperature change between reference (wind-off) -and run (wind-on) data is a major source of error.…”

Section: Introductionmentioning

confidence: 98%

“…Especially at low speed testing, high accurate PSP measurements are hardly possible without temperature correction because the change of the luminescence intensity by the pressure change is almost the same magnitude with that by a temperature change of a few degrees. To increase the accuracy of PSP measurement, researchers have developed low temperature-dependent dyes and polymers for PSP [1][2] and temperature-correction method with an infrared camera 3) or Temperature-Sensitive Paint (TSP) [4][5][6][7][8][9] . Furthermore, Yorita et al 10) and Matsuda et al 11) .…”

Section: Introductionmentioning

confidence: 99%

Reduction of Temperature Effect in Pressure-Sensitive Paint Measurements by Model Materials and Coatings

Egami

Fujii

Takagi

et al. 2012

28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference

View full text Add to dashboard Cite

Pressure-Sensitive Paint (PSP) generally changes its luminescence intensity not only with pressure but also with temperature. The effect of temperature variations on a model surface decreases the measurement accuracy of PSP. Therefore, it is important to minimize temperature variations on the surface during wind tunnel testing. In this study, we have investigated the effect of model materials and coatings on the temperature variations on a model surface. Plate models made of three different materials: aluminium alloy, stainless steel, and wood with two thicknesses: 2 and 10 mm were prepared and then coated with PSP. Temperature variations on the model surfaces heated with hot air flow was measured by means of an infrared camera. The results revealed that the magnitude of the temperature variations on the model surface strongly depends on the model material and thickness, and applied coatings. The model with a higher heat capacity showed a smaller rate of temperature change on the model surface. Moreover, the models coated with PSP showed 2-3 times higher temperature change rates than those without the coating due to the low thermal conductivity of the applied layer. To resolve this problem, a high thermal conductive PSP has been developed by mixing high thermal conductive particles. This novel PSP successfully reduced the rate of the temperature change to almost the same level as a non-coated metal model surface. omenclature A, B = Stern-Volmer constants AA = aluminum alloy As = surface area, m 2 Bi = Biot number (= hL/ λ) C = heat capacity (C V V ), J/K C V = volumetric heat capacity, kJ/(K⋅m 3 ) Fo = Fourier Number (= ‫ܮ/ݐߙ‬ ଶ ) I = luminescence intensity, counts L = plate thickness, m P = pressure, kPa R = rate of temperature increase/decrease, K/min SS = stainless steel T = temperature, K 2 V = volume, m 3 c = specific heat, J/(kg⋅K) h = convective heat transfer coefficient, W/(m 2 ⋅K) t = time, sec x = distance, m α = heat diffusivity (=λ/(cρ)), m 2 /s δ i = eigenvalue, positive root of ߜ tan ߜ = ‫݅ܤ‬ ε = heat emissivity λ = thermal conductivity, W/(m⋅K) ρ = density, kg/m 3 Subscripts 0 = initial value max = maximum ref = reference ∞ = circumstance

show abstract

“…However, this symmetrical painting cannot be applied to an asymmetric flow field. Since most actual flow fields are asymmetric, the following three methods have been developed in which PSP and TSP measurements are applied to the same place: biluminophore paint [9][10][11][12][13][14], multilayer paint [15,16], and dotarray [17][18][19][20][21] sensors.…”

Section: Introductionmentioning

confidence: 99%

Optimal gate selection method for simultaneous lifetime-based measurement of PSP and TSP

Kasai¹,

Nagata²,

Nonomura³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

In this study, a new method that optimizes a measurement condition in a lifetime-based simultaneous measurement of a pressure-sensitive paint (PSP) and a temperature-sensitive paint (TSP) is proposed for the improvement of the accuracy of the pressure measurement. An optimal gate is selected based on a pressure measurement error when calculating the pressure and the temperature simultaneously from measurement values of a PSP and a TSP. A shot noise of a PSP, a temperature error, and a fluctuation in an emission intensity ratio due to blurring were considered error factors of the PSP measurement. The pressure measurement error propagated from each error source was considered as an evaluation index in an optimization of a measurement condition. We evaluated 17 types of TSP characteristics and selected an optimal TSP and a measurement condition for the PSP measurement. Further, the optimized measurement condition was evaluated in a PSP/TSP simultaneous measurement using a coupon-based test. The optimal measurement condition obtained based on the proposed method and an empirical selection method were compared by a PSP/TSP simultaneous measurement using a coupon-based test. A small-pressure measurement error, i.e., high pressure-measurement accuracy, was realized by the proposed method in the simultaneous lifetime-based method of a PSP and a TSP. In addition to the analyses above, the blurring effects were found to be minor and briefly summarized in Appendices.

show abstract

Development of Bi-Luminophore Pressure-Sensitive Paint Systems

Cited by 8 publications

References 10 publications

Photostability Enhancement of Dual-Luminophore Pressure-Sensitive Paint by Adding Antioxidants

Photostability Enhancement of Dual-Luminophore Pressure-Sensitive Paint by Adding Antioxidants

Reduction of Temperature Effect in Pressure-Sensitive Paint Measurements by Model Materials and Coatings

Optimal gate selection method for simultaneous lifetime-based measurement of PSP and TSP

Contact Info

Product

Resources

About