Sub-millimeter resolution pressure measurement on free flight model at Mach 1.5 using novel non-intrusive optical technique

Kurihara, Daiki; Gonzales, Joseph; Claucherty, Steven; Kiritani, Hideki; Fujita, Koji; Jemcov, Aleksandar; Nagai, Hiroki; Sakaue, Hirotaka

doi:10.1016/j.expthermflusci.2020.110243

Cited by 9 publications

(6 citation statements)

References 19 publications

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“…The utilization of optical high-resolution measurement techniques, capitalizing on their non-intrusive and threedimensional measurement advantages, has gained widespread application in observing and investigating intricate flow dynamics [1][2][3] . In plant protection drone spray fields, liquid droplets are propelled from nozzles by high-pressure airflow and subsequently undergo drifting.…”

Section: Introductionmentioning

confidence: 99%

Spray droplet field reconstruction based on synthetic aperture imaging

Qu,

Liu,

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Imaging Detection and Target Recognition

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Quantitative analysis of spray droplet fields plays a pivotal role in various domains, encompassing internal combustion engine combustion diagnostics, equipment spray coating and corrosion prevention, and unmanned aerial vehicle-based agricultural pesticide dispersion. Precise measurement of the spatial distribution of spray droplet fields facilitates accurate control and orientation of spraying, thereby propelling the intelligent evolution of both industrial and agricultural sectors. In light of the substantial dimensions of spray fields, achieving focused imaging of all droplets on the camera imaging plane during reconstruction proves unattainable. Addressing this challenge, this study suggests employing a four-camera array configuration. According to the characteristics of the defocusing blur of spray droplets, the cameras on the array capture images of the droplets from diverse perspectives. Subsequently, these images are merged through a refocusing process. This method offers accurate extraction of out-of-focus droplet centers. Employing three-dimensional cross-correlation analysis, the motion trajectories of the spray droplet field can be inferred with precision.

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Section: Introductionmentioning

confidence: 99%

Spray droplet field reconstruction based on synthetic aperture imaging

Qu,

Liu,

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Imaging Detection and Target Recognition

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“…Sakaue et al introduced the motion-capturing PSP method, which allows for moving, fluttering, and free-flight measurements [ 30 , 31 , 32 , 33 ]. It involves two luminophores: one that is sensitive to pressure (signal) and another that is insensitive to pressure (reference).…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it can be difficult to isolate only a particular wavelength of light i ious experimental measurements. Sakaue et al introduced the motion-capturing PSP method, which allows for mo fluttering, and free-flight measurements [30][31][32][33]. It involves two luminophores: on is sensitive to pressure (signal) and another that is insensitive to pressure (reference emissions from the signal and reference luminophores are captured by means of a camera.…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependency Model in Pressure Measurement for the Motion-Capturing Pressure-Sensitive Paint Method

Kurihara,

Sakaue

2023

Sensors

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Pressure-sensitive paint (PSP) has received significant attention for capturing surface pressure in recent years. One major source of uncertainty in PSP measurements, temperature dependency, stems from the fundamental photophysical process that allows PSP to extract pressure information. The motion-capturing PSP method, which involves two luminophores, is introduced as a method to reduce the measurement uncertainty due to temperature dependency. A theoretical model for the pressure uncertainty due to temperature dependency is proposed and demonstrated using a static pressure measurement with an applied temperature gradient. The experimental validation of the proposed model shows that the motion-capturing PSP method reduces the temperature dependency by 37.7% compared to the conventional PSP method. The proposed model also proves that a PSP with zero temperature dependency is theoretically possible.

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“…AA-PSP is fabricated by adsorbing a dye molecule onto an anodized aluminum model using the dipping method, AA-PSP exhibits good oxygen permeability, owing to the porous surface of AA-PSP and allows for fast time response. AA-PSPs have been employed for the pressure measurements in the transonic and supersonic flows [20][21][22][23][24][25]. Hangai et al investigated the relationship between the type of electrolyte for anodization and the pore size of the model [26].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Formulations on Pyrene-Based Anodized-Aluminum Pressure-Sensitive Paints for Supersonic Phenomena

Yomo

Ikami

Fujita

et al. 2022

Sensors

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Pressure-sensitive paint (PSP) is an optical sensor that can measure global pressure distribution by using the oxygen quenching of dye molecules. In particular, anodized aluminum pressure-sensitive paint (AA-PSP) exhibits a fast time response. AA-PSP has been used in unsteady measurements at supersonic and transonic speeds, such as on the surface of a transonic free-flying sphere or the wall of a shock tube when the shock wave passes. To capture such ultrafast phenomena, the frame rate of the camera must be sufficiently fast, and the exposure time must be sufficiently short. Therefore, it is desirable that the AA-PSP exhibits bright luminescence, high-pressure sensitivity, and fast response time. This study focused on pyrene-based AA-PSPs and investigated their characteristics, such as luminescence intensity and pressure sensitivity, at different anodization times, dipping solvents, and dipping concentrations. Furthermore, a time-response test using a shock tube was conducted on the brightest AA-PSP. Consequently, the time for a 90% rise in pressure was 2.2 μs.

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Sub-millimeter resolution pressure measurement on free flight model at Mach 1.5 using novel non-intrusive optical technique

Cited by 9 publications

References 19 publications

Spray droplet field reconstruction based on synthetic aperture imaging

Spray droplet field reconstruction based on synthetic aperture imaging

Temperature Dependency Model in Pressure Measurement for the Motion-Capturing Pressure-Sensitive Paint Method

Investigation of Formulations on Pyrene-Based Anodized-Aluminum Pressure-Sensitive Paints for Supersonic Phenomena

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