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

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