Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical Unsteady Pressure Sensor
Abstract
:1. Introductions
2. Pressure-Sensitive Paint
2.1. Basic Principles of PSP
2.2. Anodized-Aluminum Pressure-Sensitive Paint Characteristics
3. Experimental Apparatus
3.1. Materials and Luminophore Solution
- (1)
- Pre-treatmentPure aluminum samples were soaked into 3% sodium hydroxide solution a few minutes. Pure aluminum plates were rinsed with distilled water after the soaking process. Then, the plates were dried in vacuum desiccators for several hours.
- (2)
- AnodizationTwo types of electrolytes, sulfuric acid and phosphoric acid, were used in the anodizing process. The post-treatment process is different for the electrolyte. The samples were anodized with a constant current density of 12.5 mA/cm. The sample was connected to the anode in 1 molar sulfuric acid in 10 or 1 molar phosphoric acid in 30 . After the anodization process, the samples were rinsed with distilled water and dried in vacuum desiccators for several hours in a vacuum desiccator.
- (3)
- Post-treatmentThe anodized samples were soaked into 3% phosphoric acid for 20 min at a constant temperature (20–30 ) in the case of fabrication by using the sulfuric acid electrolyte or 60 min at a constant temperature (20–30 ) in the case of fabrication by using the phosphoric acid electrolyte. Then, the samples were then rinsed with distilled water and dried in vacuum desiccators for several hours.
- (4)
- Luminophore adsorptionThe sample is dipped into the luminophore () solution for 100 s. Then, the sample is quickly rinsed with pure acetone and the inhomogeneous adsorption of luminophore is reduced. Finally, it is dried at least overnight in a vacuum desiccator.
3.2. Fluorescence Spectroscopy
3.3. Static Calibration Chamber
3.4. Laser and Camera for Laser Photodegradation
3.5. Picosecond Laser and Streak Camera
3.6. Resonance Tube
3.7. Shock Tube
4. Results and Discussions
4.1. Static Characteristics
4.1.1. Excitation and Emission Spectrum
4.1.2. Luminescence Lifetime
4.1.3. Signal Intensity
4.1.4. Pressure and Temperature Sensitivities
4.1.5. Photodegradation
4.1.6. Solvent Resistance
4.2. Dynamic Characteristics
4.2.1. Resonance Tube
4.2.2. Shock Tube Experiment
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample Name | |||||||||
---|---|---|---|---|---|---|---|---|---|
Electrolyte | Sulfuric acid | Phosphoric acid | |||||||
Pores diameter (nm) | 20–100 | 165 | |||||||
Anodization time (min) | 20 | 10 | 20 | 30 | 20 | 20 | 20 | 30 | 60 |
Layer thickness (µm) | 4.9 | 1.7 | 4.9 | 8.5 | 4.9 | 4.9 | 4 | 4.9 | 9.8 |
Luminophore | Ru(dpp)3 | ||||||||
Luminophore concentration (mM *) | 0.1 | 0.01 | 0.9 | 0.1 |
Sample | ||||||||
---|---|---|---|---|---|---|---|---|
0.437 | 0.499 | 0.544 | 0.505 | 0.485 | 0.331 | 0.377 | 0.505 | |
1.461 | 0.526 | 0.815 | 0.726 | 0.774 | 0.104 | 0.072 | 0.091 | |
Sample | ||||||||
---|---|---|---|---|---|---|---|---|
0.010 | 0.051 | −0.009 | 0.062 | 0.066 | 0.146 | 0.152 | 0.034 | |
1,000,000 | 0.93 | 1.07 | 1.31 | 1.26 | 1.28 | 1.59 | 1.77 | 1.29 |
2,000,000 | 0.57 | 0.63 | 0.87 | 0.78 | 0.77 | 1.04 | 1.12 | 0.81 |
Sample No. | ||||
---|---|---|---|---|
0.482 | 0.644 | 0.520 | 0.624 | |
9.32 × | 2.35 × | 0.839 | 0.125 | |
Signal intensity | 1 | 0.81 | 1 | 0.80 |
Sample | ||||
---|---|---|---|---|
Estimated cut-off frequency (kHz) | 15.0 | 12.5 | 9.0 | 15.2 |
Diffusion coefficient (m/s) | ||||
Theoretical diffusion coefficient (m/s) |
Sample | Mach Number of Normal Shock Wave | The Time Constant (µs) | The 90% Rise Time (µs) |
---|---|---|---|
1.41 | 4.87 | 11.2 | |
1.63 | 2.60 | 5.99 |
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Oka, Y.; Nagata, T.; Kasai, M.; Ozawa, Y.; Asai, K.; Nonomura, T. Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical Unsteady Pressure Sensor. Sensors 2022, 22, 6401. https://doi.org/10.3390/s22176401
Oka Y, Nagata T, Kasai M, Ozawa Y, Asai K, Nonomura T. Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical Unsteady Pressure Sensor. Sensors. 2022; 22(17):6401. https://doi.org/10.3390/s22176401
Chicago/Turabian StyleOka, Yoshinori, Takayuki Nagata, Miku Kasai, Yuta Ozawa, Keisuke Asai, and Taku Nonomura. 2022. "Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical Unsteady Pressure Sensor" Sensors 22, no. 17: 6401. https://doi.org/10.3390/s22176401
APA StyleOka, Y., Nagata, T., Kasai, M., Ozawa, Y., Asai, K., & Nonomura, T. (2022). Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical Unsteady Pressure Sensor. Sensors, 22(17), 6401. https://doi.org/10.3390/s22176401