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Optical Sensors for Flow Diagnostics II
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Optical Sensors for Flow Diagnostics II

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: 20 July 2024 | Viewed by 3459

Special Issue Editors

Prof. Dr. Yasuhiro Egami

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Guest Editor
Department of Mechanical Engineering, Aichi Institute of Technology,1247 Yachigusa, Yakusa-Cho, Toyota 470-0392, Aichi-Prefecture, Japan
Interests: pressure-sensitive paint; temperature-sensitive paint; optical measurement
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Hiroki Nagai

E-Mail Website
Guest Editor
Institute of Fluid Science, Tohoku University, Sendai 982-8577, Japan
Interests: mars airplane; pressure and temperature-sensitive paint; low reynolds number; hypersonic flow; thermofluid dynamics; spacecraft thermal control
Special Issues, Collections and Topics in MDPI journals
Dr. Yu Matsuda

E-Mail Website
Guest Editor
Department of Modern Mechanical Engineering, Waseda University, 3-4-1 Ookubo, Shinjuku-ku, Tokyo 169-8555, Japan
Interests: pressure- and temperature-sensitive paint (PSP, TSP); pressure-sensitive molecular film (PSMP); single-molecule tracking (SMT)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Following the success of our Sensors Special Issue entitled “Optical Sensors for Flow Diagnostics”, we would like to once again invite our colleagues from across the world to contribute their expertise, insights, and findings in the form of original research articles and reviews for the second edition of the Special Issue, entitled “Optical Sensors for Flow Diagnostics II”. 

The purpose of this Special Issue is to contribute to the state of the art by introducing the latest developments in optical pressure (oxygen) and temperature imaging sensors based on the photochemical reaction and their applications. This Special Issue welcomes submissions of original research, novel developments, and experimental studies on optical sensors and their application in optical sensing of thermofluid dynamics.

In recent years, the development of optical pressure (oxygen) and temperature sensors has been remarkable. A pressure sensor based on oxygen quenching has significantly improved the time response. With the improvement of high-speed cameras and the development of measurement methods and post-measurement image processing, the time and pressure resolutions of the pressure imaging measurements are greatly extended. Optical pressure sensors are also applied to measurements of deformed and free-flight objects. Temperature sensors are used not only to measure the temperature distribution, but also to carry out a wide range of applications such as measuring heat flux and shear stress, and visualizing boundary layer transitions. With the development of sensors, hardware, metrology, and post-image processing, we will be able to apply them to a wider range of measurements. We contribute to the development of new sensing technologies by featuring the latest research cases.

  • Pressure-sensitive paint (PSP);
  • Temperature-sensitive paint (TSP);
  • Pressure (oxygen) sensors;
  • Thermal sensors;
  • Luminescence;
  • Photochemical sensors;
  • Thermofluid dynamics;
  • Unsteady measurement;
  • High-speed imaging.

Optical pressure and temperature sensors, known as pressure- and temperature-sensitive paints, are photochemical sensors based on oxygen quenching and temperature quenching, respectively. These sensors have received increased attention in recent years and are being used by a wider range of researchers and engineers. Therefore, it is of great significance to feature these sensors in Sensors.

Prof. Dr. Yasuhiro Egami
Prof. Dr. Hiroki Nagai
Dr. Yu Matsuda
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (4 papers)

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Research

13 pages, 3801 KiB  
Article
Improvement of Temperature Measurement Accuracy of Hot Airflow Using Ultrafine Thermo-Sensitive Fluorescent Wires of Lumisis Phosphor
by Shumpei Funatani and Yusaku Tsukamoto
Sensors 2024, 24(8), 2510; https://doi.org/10.3390/s24082510 - 14 Apr 2024
Viewed by 289
Abstract
In this study, the fluorescence properties of Lumisis, a phosphor that can be easily applied to ultrafine wires, were evaluated. By evaluating the wavelength characteristics of Lumisis phosphor, we investigated the possibility of applying it to a dual-wavelength laser-induced fluorescence (LIF) measurement system [...] Read more.
In this study, the fluorescence properties of Lumisis, a phosphor that can be easily applied to ultrafine wires, were evaluated. By evaluating the wavelength characteristics of Lumisis phosphor, we investigated the possibility of applying it to a dual-wavelength laser-induced fluorescence (LIF) measurement system and evaluated the accuracy of temperature measurements. The difference between the decrease in the percentage intensities of the red and green fluorescence of Lumisis phosphors showed that two-color LIF was possible. The Lumisis phosphor–mixture ratio was optimized as 1:1.25, and the average measurement error of the fluorescent wire was 0.20 K, as evaluated through uncertainty analysis. Finally, the application of this measurement method to hot air jet phenomena showed that this method accurately captures the temperature changes in hot air, thus proving its validity. Full article
(This article belongs to the Special Issue Optical Sensors for Flow Diagnostics II)
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17 pages, 4478 KiB  
Article
Temperature Dependency Model in Pressure Measurement for the Motion-Capturing Pressure-Sensitive Paint Method
by Daiki Kurihara and Hirotaka Sakaue
Sensors 2023, 23(24), 9714; https://doi.org/10.3390/s23249714 - 08 Dec 2023
Viewed by 552
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Optical Sensors for Flow Diagnostics II)
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14 pages, 4180 KiB  
Article
Development of a Temperature Distribution Measurement System for Transmission Oil for Transportation Equipment
by Shumpei Funatani, Ryoga Takei and Yusaku Tsukamoto
Sensors 2023, 23(12), 5499; https://doi.org/10.3390/s23125499 - 11 Jun 2023
Viewed by 863
Abstract
In this study, an optical sensor using thermo-sensitive phosphor and its measurement system for visualizing and measuring the temperature distribution in an arbitrary cross-section of transmission oil using one type of phosphor, whose peak wavelength changes with temperature, is proposed. Because the intensity [...] Read more.
In this study, an optical sensor using thermo-sensitive phosphor and its measurement system for visualizing and measuring the temperature distribution in an arbitrary cross-section of transmission oil using one type of phosphor, whose peak wavelength changes with temperature, is proposed. Because the intensity of the excitation light is gradually attenuated by the scattering of the laser light owing to microscopic impurities in the oil, we attempted to reduce the scattering effect by increasing the excitation light wavelength. Therefore, Pyrromethene 597 was selected as the optical sensor using thermo-sensitive phosphor, and a DPSS (Diode Pumped Solid State) laser with a wavelength of 532 nm was used as the excitation light. Using this measurement system, we measured the temperature distribution of a vertical buoyant jet of transmission oil and validated the measurement method. In addition, it was shown that this measurement system could be applied to the measurement of the temperature distribution in transmission oil with cavitation foaming. Full article
(This article belongs to the Special Issue Optical Sensors for Flow Diagnostics II)
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13 pages, 1166 KiB  
Article
Photostability Enhancement of Dual-Luminophore Pressure-Sensitive Paint by Adding Antioxidants
by Kazuki Uchida, Yuta Ozawa, Keisuke Asai and Taku Nonomura
Sensors 2022, 22(23), 9470; https://doi.org/10.3390/s22239470 - 04 Dec 2022
Cited by 1 | Viewed by 1290
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Optical Sensors for Flow Diagnostics II)
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