sensors-logo

Journal Browser

Journal Browser

Special Issue "Optical Sensors for Flow Diagnostics"

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

Deadline for manuscript submissions: 20 November 2021.

Special Issue Editors

Dr. Yasuhiro Egami
E-Mail Website
Guest Editor
Department of Mechanical Engineering, Aichi Institute of Technology,1247 Yachigusa, Yakusa-Cho, Toyota, Aichi-prefecture, 470-0392 Japan
Interests: pressure-sensitive paint; temperature-sensitive paint; optical measurement
Prof. Hiroki Nagai
E-Mail Website
Guest Editor
Institute of Fluid Science, Tohoku University, Sendai, Japan
Interests: Mars air plane; pressure-sensitive paint; thermofluid dynamics; spacecraft thermal control
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 Issue Information

Dear Colleagues,

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 measurement on deformed and free-flight objects. Temperature sensors are used not only to measure temperature distribution, but also for a wide range of applications such as to measure heat flux and shear stress, and visualize 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) sensor;
  • Thermal sensor;
  • Luminescence;
  • Photochemical sensor;
  • 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 are receiving more and more 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.

Dr. Yasuhiro Egami
Prof. 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 papers will be 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 2200 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 (2 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

Open AccessArticle
Frequency Response of Pressure-Sensitive Paints under Low-Pressure Conditions
Sensors 2021, 21(9), 3187; https://doi.org/10.3390/s21093187 - 04 May 2021
Viewed by 285
Abstract
The characteristics of fast-response pressure-sensitive paints (PSPs) in low-pressure conditions were evaluated. Three representative porous binders were investigated: polymer-ceramic PSP (PC-PSP), anodized-aluminum PSP (AA-PSP), and thin-layer chromatography PSP (TLC-PSP). For each PSP, two types of luminophores, Pt(II) meso-tetra (pentafluorophenyl) porphine (PtTFPP) and tris(bathophenanthroline) [...] Read more.
The characteristics of fast-response pressure-sensitive paints (PSPs) in low-pressure conditions were evaluated. Three representative porous binders were investigated: polymer-ceramic PSP (PC-PSP), anodized-aluminum PSP (AA-PSP), and thin-layer chromatography PSP (TLC-PSP). For each PSP, two types of luminophores, Pt(II) meso-tetra (pentafluorophenyl) porphine (PtTFPP) and tris(bathophenanthroline) ruthenium dichloride (Ru(dpp)3), were used as sensor molecules. Pressure sensitivities, temperature sensitivities, and photodegradation rates were measured and evaluated using a pressure chamber. The effect of ambient pressure on the frequency response was investigated using an acoustic resonance tube. The diffusivity coefficients of PSPs were estimated from the measured frequency response and luminescent lifetime, and the governing factor of the frequency response under low-pressure conditions was identified. The results of static calibration show that PC-PSP/PtTFPP, AA-PSP/Ru(dpp)3, and TLC-PSP/PtTFPP have high pressure sensitivities that exceed 4%/kPa under low-pressure conditions and that temperature sensitivity and photodegradation rates become lower as the ambient pressure decreases. Dynamic calibration results show that the dynamic characteristics of PSPs with PtTFPP are dependent on the ambient pressure, whereas those of PSPs with Ru(dpp)3 are not influenced by the ambient pressure. This observation indicates that the governing factor in the frequency response under low-pressure conditions is the lifetime for PC-PSP and TLC-PSP, whereas the governing factor for AA-PSP is diffusion. Full article
(This article belongs to the Special Issue Optical Sensors for Flow Diagnostics)
Show Figures

Figure 1

Open AccessArticle
Effect of Oxygen Mole Fraction on Static Properties of Pressure-Sensitive Paint
Sensors 2021, 21(4), 1062; https://doi.org/10.3390/s21041062 - 04 Feb 2021
Cited by 1 | Viewed by 348
Abstract
The effects of the oxygen mole fraction on the static properties of pressure-sensitive paint (PSP) were investigated. Sample coupon tests using a calibration chamber were conducted for poly(hexafluoroisopropyl methacrylate)-based PSP (PHFIPM-PSP), polymer/ceramic PSP (PC-PSP), and anodized aluminum PSP (AA-PSP). The oxygen mole fraction [...] Read more.
The effects of the oxygen mole fraction on the static properties of pressure-sensitive paint (PSP) were investigated. Sample coupon tests using a calibration chamber were conducted for poly(hexafluoroisopropyl methacrylate)-based PSP (PHFIPM-PSP), polymer/ceramic PSP (PC-PSP), and anodized aluminum PSP (AA-PSP). The oxygen mole fraction was set to 0.1–100%, and the ambient pressure (Pref) was set to 0.5–140 kPa. Localized Stern–Volmer coefficient Blocal increased and then decreased with increasing oxygen mole fraction. Although Blocal depends on both ambient pressure and the oxygen mole fraction, its effect can be characterized as a function of the partial pressure of oxygen. For AA-PSP and PHFIPM-PSP, which are low-pressure- and relatively low-pressure-type PSPs, respectively, Blocal peaks at PO2ref<12 kPa. In contrast, for PC-PSP, which is an atmospheric-pressure-type PSP in the investigated range, Blocal does not have a peak. Blocal has a peak at a relatively high partial pressure of oxygen due to the oxygen permeability of the polymer used in the binder. The peak of SPR, which is the emission intensity change with respect to normalized pressure fluctuation, appears at a lower partial pressure of oxygen than that of Blocal. This is because the intensity of PSP becomes quite low at a high partial pressure of oxygen even if Blocal is high. Hence, the optimal oxygen mole fraction depends on the type of PSP and the ambient pressure range of the experiment. This optimal value can be found on the basis of the partial pressure of oxygen. Full article
(This article belongs to the Special Issue Optical Sensors for Flow Diagnostics)
Show Figures

Figure 1

Back to TopTop