Visualization of two-dimensional temperature field on a plate with normal impingement of a supersonic jet

Thermographic phosphors utilize the luminescence properties of doped ceramic materials and can be used to measure surface temperatures as a non-contact temperature measurement method. These phosphor materials are coated onto the object of interest and are excited by a short UV laser pulse, and exhibit a temperature-sensitive exponential decay in emission when their excitation has stopped. This article first explores the temperature dependence of different binders to fabricate a cost-effective two-dimensional temperature measurement method based on lifetime technique under normal supersonic jet impingement. Different phosphor-coated samples by magnesium fluorogermanate thermographic phosphors were analyzed using a spectrometer and a photomultiplier to study the intensity of emitted light and temperatures at discrete points, respectively. Then, a high-speed camera is used to measure the surface temperature distributions. In the end, the phosphor coating on test specimens was installed under a normal supersonic jet to confirm the coating stability, which is essential for the applications as the temperature sensor.

Automated summary

This article explores a cost-effective two-dimensional temperature measurement method based on the lifetime technique, which utilizes thermographic phosphor materials to measure surface temperatures. The study analyzes different phosphor-coated samples to study emitted light intensity and temperatures at discrete points. Additionally, a high-speed camera is used to measure surface temperature distributions to ensure coating stability for temperature sensing applications.