Response time scales of anodized-aluminum pressure-sensitive paints

Sakaue, Hirotaka; Morita, Katsuaki; Iijima, Yoshimi; Sakamura, Yoshitaka

doi:10.1016/j.sna.2013.04.040

Cited by 26 publications

(11 citation statements)

References 11 publications

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“…Since a shock tube generates a large pressure change within a very short time, it also facilitates the study of the effect of non-linearity on response of PC-PSP. Previously, shock tubes or solenoid-valve driven pressure jump devices have been used to quantify the response times of conventional PSPs [ 11 , 12 , 13 ] and Anodized-Aluminum PSP (AA-PSP) [ 14 , 15 , 16 ] and its derivatives [ 17 ]. In [ 18 ], an earlier version of PC-PSP [ 19 ] was tested and its response time was documented as 253 µs using a first order fit (time constant).…”

Section: Introductionmentioning

confidence: 99%

Step Response Characteristics of Polymer/Ceramic Pressure-Sensitive Paint

Pandey

Gregory

2015

Sensors

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Experiments and numerical simulations have been used in this work to understand the step response characteristics of Polymer/Ceramic Pressure-Sensitive Paint (PC-PSP). A recently developed analytical model describing the essential physics in PC-PSP quenching kinetics is used, which includes the effect of both diffusion time scale and luminescent lifetime on the net response of PC-PSP. Step response simulations using this model enables an understanding of the effects of parameters, such as the diffusion coefficient of O2 in the polymer/ceramic coating, attenuation of excitation light, ambient luminescent lifetime, sensitivity, and the magnitude and direction of pressure change on the observed response time scales of PC-PSP. It was found that higher diffusion coefficient and greater light attenuation lead to faster response, whereas longer ambient lifetime and larger sensitivity lead to slower response characteristics. Due to the inherent non-linearity of the Stern-Volmer equation, response functions also change with magnitude and direction of the pressure change. Experimental results from a shock tube are presented where the effects of varying the roughness, pressure jump magnitude and luminophore probe have been studied. Model parameters have been varied to obtain a good fit to experimental results and this optimized model is then used to obtain the response time for a step decrease in pressure, an estimate of which is currently not obtainable from experiments.

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Section: Introductionmentioning

confidence: 99%

Step Response Characteristics of Polymer/Ceramic Pressure-Sensitive Paint

Pandey

Gregory

2015

Sensors

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“…Considering the thickness uncertainty, response times of AA-PSPs can be said on the order of ten microseconds with the anodized-aluminum thickness of 10 μm. Sakaue et al reported that the response time of AA-PSP showed a minimal effect by the luminophore selected [31]. This indicates that the response time of AA-PSP has smaller effect on the luminophore application parameters than the effect on AA-PSP thickness.…”

Section: Response Timementioning

confidence: 99%

“…The output signal from the PMT was amplified by Hamamatsu C1053-03 through an analog low-pass filter with a cutoff frequency of 1 MHz. The filtered signal was then digitized to 12 bits and sampled on an A/D converter (Yokogawa, DL1540C) at a rate of 200 MHz[31].…”

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confidence: 99%

Dipping Deposition Study of Anodized-Aluminum Pressure- Sensitive Paint for Unsteady Aerodynamic Applications

Sakaue¹

2014

Optical Sensors - New Developments and Practical Applications

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In aerospace engineering, anodized-aluminum pressure-sensitive paint AA-PSP has been used in short duration time tests [ -], unsteady flow visualizations, and unsteady pressure measurements [ -]. Because of its nano-open structure Figure , AA-PSP yields high mass diffusion that results in a pressure response time on the order of ten microseconds [ ]. This structure enables oxygen gas to interact directly with luminophores on the pore surface, which provides fast response to pressures. By applying an AA-PSP, we can obtain global surface pressure information instead of pointwise information that may result in wide applications in pressure detection fields. AA-PSP is an optical sensor that consists of a molecular pressure probe luminophore and an anodized aluminum as a supporting matrix. As schematically shown in Figure , 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. Because the gaseous oxygen can be described as a partial pressure of oxygen as well as a static pressure, the luminescence from an AA-PSP can be described as a static pressure. See Section . for a detailed description.The luminophore is directly related to important parameters of AA-PSPs, such as the luminescent signal level, pressure sensitivity, temperature dependency, and response time. Mainly three types of luminophores are commonly used for PSP in general, such as ruthenium complex, porphyrin, and pyrene. Each luminophore has an optimum excitation wavelength, and its peak wavelength of luminescence varies by the luminophore as well. For AA-PSP, the luminophore is applied on the anodized-aluminum surface by the dipping deposition method [ ]. This method requires a luminophore, a solvent, and an anodized-aluminum coating. The

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“…More recent studies have also concluded that the 90% rise time is a more valuable representation of the response time. 24…”

Section: Luminescence and Data Acquisitionmentioning

confidence: 99%

Characterization of multi-dye pressure-sensitive microbeads

Lacroix

Viraye-Chevalier

Seiter

et al. 2013

Review of Scientific Instruments

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The response times of pressure-sensitive particles to passing shockwaves were measured to investigate their ability to accurately determine pressure changes in unsteady flows. The particles tested were loaded with novel pressure-sensitive dyes such as Pt (II) meso-tetra(pentafluorophenyl)porphine, Pt(II) octaethylporphine, bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl))iridium III, and iridium(III) bis(4-phenylthieno[3,2-c] pyridinato-N,C2')acetylacetonate. For this work, porous silicon dioxide pressure-sensitive beads (PSBeads) were used. Two synthetic procedures were used to fabricate the particles. In the first, a one-step method loaded dyes during the synthesis of microbeads, in the second a two-step method synthesized the microbeads first, then loaded the dyes. The shock tube facility was used to measure the response times of microbeads to fast pressure jumps. The study involved testing multiple luminophors loaded in microbeads with various size distributions. Response times for the silica-based microbeads ranged between 26 μs and 462 μs (at 90% of the amplitude response), which are much faster than previously reported polystyrene-based microbead response times, which range from 507 μs to 1582 μs (at 90% of the amplitude response) [F. Kimura, M. Rodriguez, J. McCann, B. Carlson, D. Dabiri, G. Khalil, J. B. Callis, Y. Xia, and M. Gouterman, "Development and characterization of fast responding pressure sensitive microspheres," Rev. Sci. Instrum. 79, 074102 (2008)].

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Response time scales of anodized-aluminum pressure-sensitive paints

Cited by 26 publications

References 11 publications

Step Response Characteristics of Polymer/Ceramic Pressure-Sensitive Paint

Step Response Characteristics of Polymer/Ceramic Pressure-Sensitive Paint

Dipping Deposition Study of Anodized-Aluminum Pressure- Sensitive Paint for Unsteady Aerodynamic Applications

Characterization of multi-dye pressure-sensitive microbeads

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