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Dr. TATSUNORI HAYASHI
University of Notre Dame

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Research Keywords & Expertise

0 Aerospace Engineering
0 Pressure Sensors
0 Luminescent Imaging
0 Unsteady Aerodynamics
0 Luminescent polymers, plastic solar collectors, chromogenic polymers, polymer nanocomposites, smart materials, aggregation induced emission

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Journal article
Published: 17 June 2020 in Aerospace
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Polymer-ceramic pressure-sensitive paint (PC-PSP) has been used for capturing unsteady pressure over aerodynamic surfaces. Spatial and temporal pressure information is calculated from the luminescent intensity produced by a PC-PSP, which provides a nonintrusive pressure measurement. Despite its benefits, the temperature dependency of PC-PSP makes extraction of quantitative pressure data challenging. The temperature dependency in terms of the static and dynamic characteristics of a ruthenium-based PC-PSP is studied herein. The impact of temperature dependency on PC-PSP characteristics is also discussed in the context of an unsteady pressure measurement.

ACS Style

Tatsunori Hayashi; Hirotaka Sakaue. Temperature Effects on Polymer-Ceramic Pressure-Sensitive Paint as a Luminescent Pressure Sensor. Aerospace 2020, 7, 1 .

AMA Style

Tatsunori Hayashi, Hirotaka Sakaue. Temperature Effects on Polymer-Ceramic Pressure-Sensitive Paint as a Luminescent Pressure Sensor. Aerospace. 2020; 7 (6):1.

Chicago/Turabian Style

Tatsunori Hayashi; Hirotaka Sakaue. 2020. "Temperature Effects on Polymer-Ceramic Pressure-Sensitive Paint as a Luminescent Pressure Sensor." Aerospace 7, no. 6: 1.

Journal article
Published: 19 February 2020 in Journal of Applied Physics
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Luminescent imaging is an area of active research for obtaining physical and chemical properties of a flow. Oxygen-sensitive luminescent probes are used as pressure-sensitive paints to capture unsteady flow over a fluid dynamic surface. The luminescent output is acquired by a photo-sensitive imaging chip, such as CCD and CMOS. Because these imaging chips acquire a digital signal, luminescent imaging is a poor technique for the measurement of small changes in the signal, which is equivalent to or lower than the noise level. A differential luminescent imaging method is studied to capture small fluctuations in a signal level. A theoretical model to describe the differential method is introduced and validated by experiments. Based on the static characterization, it is shown that the differential method possessed its sensitivity to capture fluctuations as small as 0.002% of the mean signal, which is an improvement in sensitivity by a factor of 81 as compared to the conventional luminescent imaging method.Luminescent imaging is an area of active research for obtaining physical and chemical properties of a flow. Oxygen-sensitive luminescent probes are used as pressure-sensitive paints to capture unsteady flow over a fluid dynamic surface. The luminescent output is acquired by a photo-sensitive imaging chip, such as CCD and CMOS. Because these imaging chips acquire a digital signal, luminescent imaging is a poor technique for the measurement of small changes in the signal, which is equivalent to or lower than the noise level. A differential luminescent imaging method is studied to capture small fluctuations in a signal level. A theoretical model to describe the differential method is introduced and validated by experiments. Based on the static characterization, it is shown that the differential method possessed its sensitivity to capture fluctuations as small as 0.002% of the mean signal, which is an improvement in sensitivity by a factor of 81 as compared to the conventional luminescent imaging method.

ACS Style

Tatsunori Hayashi; Hirotaka Sakaue. Differential luminescent imaging method. Journal of Applied Physics 2020, 127, 074502 .

AMA Style

Tatsunori Hayashi, Hirotaka Sakaue. Differential luminescent imaging method. Journal of Applied Physics. 2020; 127 (7):074502.

Chicago/Turabian Style

Tatsunori Hayashi; Hirotaka Sakaue. 2020. "Differential luminescent imaging method." Journal of Applied Physics 127, no. 7: 074502.

Conference paper
Published: 05 January 2020 in AIAA Scitech 2020 Forum
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Optical measurement techniques have evolved significantly in recent years. Pressure-Sensitive Paints (PSPs) are utilized to provide global surface pressure distributions in steady and unsteady flow. A Motion-capturing PSP method can capture the surface pressure distribution on transient motion objects such as rotating blades, while a conventional intensity method requires the separate measurement of a reference image. The motion-capturing PSP method was applied to a 400 [mm] diameter rotating blade spinning at 100 [Hz]. Time-resolved pressure distributions during the rotation were measured with a blade tip blur less than 10 [%] at 12,000 [fps].

ACS Style

Daiki Kurihara; Tatsunori Hayashi; Hirotaka Sakaue. Surface Pressure Measurement over Rotating Blade using Motion-Capturing PSP Method. AIAA Scitech 2020 Forum 2020, 1 .

AMA Style

Daiki Kurihara, Tatsunori Hayashi, Hirotaka Sakaue. Surface Pressure Measurement over Rotating Blade using Motion-Capturing PSP Method. AIAA Scitech 2020 Forum. 2020; ():1.

Chicago/Turabian Style

Daiki Kurihara; Tatsunori Hayashi; Hirotaka Sakaue. 2020. "Surface Pressure Measurement over Rotating Blade using Motion-Capturing PSP Method." AIAA Scitech 2020 Forum , no. : 1.

Conference paper
Published: 05 January 2020 in AIAA Scitech 2020 Forum
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A differential pressure-sensitive paint (PSP) method is introduced to capture a small fluctuating component of an unsteady measurement. The current PSP measurement uses an absolute luminescent signal. Based on the Stern-Volmer equation, the maximum pressure sensitivity is 100% to a reference pressure. The present study introduces a differential method that enhances the pressure sensitivity. Compared to a conventional absolute method, the pressure sensitivity can be enhanced by a factor of 81. Steady-state characterization, as well as modeling is shown to describe the differential method. Unsteady characterization based on a resonance tube indicates that the frequency response of about 5 kHz obtained by the differential method is the same as the frequency response obtained by the absolute method. As a demonstration of the differential PSP method, periodic pressure fluctuations, which had a 400 Pa amplitude, were captured by the method. Comparing the experimental results and analytical solution, the pressure obtained by the differential method was in good agreement with the analytical solution.

ACS Style

Tatsunori Hayashi; Suguru Hase; Hirotaka Sakaue. Differential Pressure-Sensitive Paint Method. AIAA Scitech 2020 Forum 2020, 1 .

AMA Style

Tatsunori Hayashi, Suguru Hase, Hirotaka Sakaue. Differential Pressure-Sensitive Paint Method. AIAA Scitech 2020 Forum. 2020; ():1.

Chicago/Turabian Style

Tatsunori Hayashi; Suguru Hase; Hirotaka Sakaue. 2020. "Differential Pressure-Sensitive Paint Method." AIAA Scitech 2020 Forum , no. : 1.

Journal article
Published: 13 June 2019 in Journal of Physics D: Applied Physics
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ACS Style

Tatsunori Hayashi; Alec W Houpt; Sergey B Leonov; Hirotaka Sakaue. Motion-capturing pressure-sensitive paint method under transient illumination by plasma source. Journal of Physics D: Applied Physics 2019, 52, 324005 .

AMA Style

Tatsunori Hayashi, Alec W Houpt, Sergey B Leonov, Hirotaka Sakaue. Motion-capturing pressure-sensitive paint method under transient illumination by plasma source. Journal of Physics D: Applied Physics. 2019; 52 (32):324005.

Chicago/Turabian Style

Tatsunori Hayashi; Alec W Houpt; Sergey B Leonov; Hirotaka Sakaue. 2019. "Motion-capturing pressure-sensitive paint method under transient illumination by plasma source." Journal of Physics D: Applied Physics 52, no. 32: 324005.

Conference paper
Published: 07 January 2018 in 2018 AIAA Aerospace Sciences Meeting
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ACS Style

Tatsunori Hayashi; Alec W. Houpt; Brock E. Hedlund; Sergey B. Leonov; Hirotaka Sakaue. Two-Color Polymer-Ceramic Pressure-Sensitive Paint for Transient Plasma in M=2 Airflow. 2018 AIAA Aerospace Sciences Meeting 2018, 1 .

AMA Style

Tatsunori Hayashi, Alec W. Houpt, Brock E. Hedlund, Sergey B. Leonov, Hirotaka Sakaue. Two-Color Polymer-Ceramic Pressure-Sensitive Paint for Transient Plasma in M=2 Airflow. 2018 AIAA Aerospace Sciences Meeting. 2018; ():1.

Chicago/Turabian Style

Tatsunori Hayashi; Alec W. Houpt; Brock E. Hedlund; Sergey B. Leonov; Hirotaka Sakaue. 2018. "Two-Color Polymer-Ceramic Pressure-Sensitive Paint for Transient Plasma in M=2 Airflow." 2018 AIAA Aerospace Sciences Meeting , no. : 1.

Conference paper
Published: 02 June 2017 in 47th AIAA Fluid Dynamics Conference
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ACS Style

Daniel Y. Chin; Kenneth O. Granlund; Tatsunori Hayashi; Hirotaka Sakaue. Unsteady PSP measurements on a cylinder translating out from a supersonic cavity. 47th AIAA Fluid Dynamics Conference 2017, 1 .

AMA Style

Daniel Y. Chin, Kenneth O. Granlund, Tatsunori Hayashi, Hirotaka Sakaue. Unsteady PSP measurements on a cylinder translating out from a supersonic cavity. 47th AIAA Fluid Dynamics Conference. 2017; ():1.

Chicago/Turabian Style

Daniel Y. Chin; Kenneth O. Granlund; Tatsunori Hayashi; Hirotaka Sakaue. 2017. "Unsteady PSP measurements on a cylinder translating out from a supersonic cavity." 47th AIAA Fluid Dynamics Conference , no. : 1.

Article
Published: 15 May 2017 in Sensors
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Polymer-ceramic pressure-sensitive paint (PC-PSP) has been investigated as a surface-pressure sensor for unsteady aerodynamics and short duration measurements. This PSP provides a fast response to a change in pressures with a spray-coating ability. Because it is sprayed onto an aerodynamic surface, the thickness of PC-PSP may play an important role in determining the performance of this sensor. The thickness of other fast PSPs, such as anodized aluminum pressure-sensitive paint, is a major factor in determining its performance. We vary the thickness of PC-PSP from 10 to 240 μm in order to study its effects on PSP measurement characteristics including time response, signal level, pressure sensitivity, and temperature dependency. It is found that the thickness does affect these characteristics. However, a thickness over 80 μm provides uniform performance in these characteristics.

ACS Style

Tatsunori Hayashi; Hirotaka Sakaue. Dynamic and Steady Characteristics of Polymer-Ceramic Pressure-Sensitive Paint with Variation in Layer Thickness. Sensors 2017, 17, 1125 .

AMA Style

Tatsunori Hayashi, Hirotaka Sakaue. Dynamic and Steady Characteristics of Polymer-Ceramic Pressure-Sensitive Paint with Variation in Layer Thickness. Sensors. 2017; 17 (5):1125.

Chicago/Turabian Style

Tatsunori Hayashi; Hirotaka Sakaue. 2017. "Dynamic and Steady Characteristics of Polymer-Ceramic Pressure-Sensitive Paint with Variation in Layer Thickness." Sensors 17, no. 5: 1125.

Conference paper
Published: 05 January 2017 in 55th AIAA Aerospace Sciences Meeting
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ACS Style

Tatsunori Hayashi; Alec Houpt; Brock E. Hedlund; Sergey Leonov; Hirotaka Sakaue. Pressure-Sensitive Paint Measurement under Transient Plasma in M=2 Airflow. 55th AIAA Aerospace Sciences Meeting 2017, 1 .

AMA Style

Tatsunori Hayashi, Alec Houpt, Brock E. Hedlund, Sergey Leonov, Hirotaka Sakaue. Pressure-Sensitive Paint Measurement under Transient Plasma in M=2 Airflow. 55th AIAA Aerospace Sciences Meeting. 2017; ():1.

Chicago/Turabian Style

Tatsunori Hayashi; Alec Houpt; Brock E. Hedlund; Sergey Leonov; Hirotaka Sakaue. 2017. "Pressure-Sensitive Paint Measurement under Transient Plasma in M=2 Airflow." 55th AIAA Aerospace Sciences Meeting , no. : 1.

Journal article
Published: 29 May 2013 in Sensors
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A polymer-ceramic pressure-sensitive paint (PC-PSP) is a fast responding and sprayable PSP which has been applied for capturing global unsteady flows. The luminophore application process is studied to enhance the characterization of the PC-PSP. A dipping deposition method is used to apply a luminophore on a polymer-ceramic coating. The method selects a solvent by its polarity index. The characterization includes the signal level, pressure sensitivity, temperature dependency, and response time. It is found that the luminophore application process affects the steady-state characterizations, such as the signal level, pressure sensitivity, and temperature dependency. A range of change for each characterization, which is based on the minimum quantity, is a factor of 4.7, 9, and 3.8, respectively. A response time on the order of ten microseconds is shown. The application process is not a dominant factor for changing the response time, which is within the uncertainty of the thickness variation. Comparisons of the effects on the luminophore application process and the polymer content are made to discuss the PC-PSP characterization results.

ACS Style

Hirotaka Sakaue; Tatsunori Hayashi; Hitoshi Ishikawa. Luminophore Application Study of Polymer-Ceramic Pressure-Sensitive Paint. Sensors 2013, 13, 7053 -7064.

AMA Style

Hirotaka Sakaue, Tatsunori Hayashi, Hitoshi Ishikawa. Luminophore Application Study of Polymer-Ceramic Pressure-Sensitive Paint. Sensors. 2013; 13 (6):7053-7064.

Chicago/Turabian Style

Hirotaka Sakaue; Tatsunori Hayashi; Hitoshi Ishikawa. 2013. "Luminophore Application Study of Polymer-Ceramic Pressure-Sensitive Paint." Sensors 13, no. 6: 7053-7064.

Book chapter
Published: 01 January 2012 in 28th International Symposium on Shock Waves
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Pressure-sensitive paint (PSP) has been widely used in aerospace applications[1]. It uses a photophysical process of oxygen quenching to relate the luminescent signals to the oxygen pressures in a testing fluid. It is composed of a luminophore, which gives the luminescent signal, and a supporting matrix, which holds the luminophore onto a testing article. PSP can be categorized by the supporting matrix: polymer PSP and porous PSP. The former uses a polymer as a supporting matrix. Gaseous oxygen needs to permeate into this layer to cause oxygen quenching. This limits the time response of this type of PSP on the order of seconds or sub-seconds. The latter uses a porous material as a supporting matrix. Gaseous oxygen can diffuse into a pore to cause oxygen quenching with a luminophore on the porous surface. The time response of this PSP is on the order of ten microseconds[2].

ACS Style

Tatsunori Hayashi; H. Ishikawa; Hirotaka Sakaue. Development of Polymer-Ceramic Pressure-Sensitive Paint and Its Application to Supersonic Flow Field. 28th International Symposium on Shock Waves 2012, 607 -613.

AMA Style

Tatsunori Hayashi, H. Ishikawa, Hirotaka Sakaue. Development of Polymer-Ceramic Pressure-Sensitive Paint and Its Application to Supersonic Flow Field. 28th International Symposium on Shock Waves. 2012; ():607-613.

Chicago/Turabian Style

Tatsunori Hayashi; H. Ishikawa; Hirotaka Sakaue. 2012. "Development of Polymer-Ceramic Pressure-Sensitive Paint and Its Application to Supersonic Flow Field." 28th International Symposium on Shock Waves , no. : 607-613.

Journal article
Published: 04 July 2011 in Sensors
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A pressure-sensitive paint (PSP) with fast response characteristics that can be sprayed on a test article is studied. This PSP consists of a polymer for spraying and a porous particle for providing the fast response. We controlled the polymer content (%) from 10 to 90% to study its effects on PSP characteristics: the signal level, pressure sensitivity, temperature dependency, and time response. The signal level and temperature dependency shows a peak in the polymer content around 50 to 70%. The pressure sensitivity was fairly constant in the range between 0.8 and 0.9 %/kPa. The time response is improved by lowering the polymer content. The variation of the time response is shown to be on the order of milliseconds to ten seconds. A weight coefficient is introduced to optimize the resultant PSPs. By setting the weight coefficient, we can optimize the PSP for sensing purposes.

ACS Style

Hirotaka Sakaue; Takuma Kakisako; Hitoshi Ishikawa. Characterization and Optimization of Polymer-Ceramic Pressure-Sensitive Paint by Controlling Polymer Content. Sensors 2011, 11, 6967 -6977.

AMA Style

Hirotaka Sakaue, Takuma Kakisako, Hitoshi Ishikawa. Characterization and Optimization of Polymer-Ceramic Pressure-Sensitive Paint by Controlling Polymer Content. Sensors. 2011; 11 (7):6967-6977.

Chicago/Turabian Style

Hirotaka Sakaue; Takuma Kakisako; Hitoshi Ishikawa. 2011. "Characterization and Optimization of Polymer-Ceramic Pressure-Sensitive Paint by Controlling Polymer Content." Sensors 11, no. 7: 6967-6977.