Work

Upconverting thermal history paint for investigations of short thermal events

Year: 2024

Type: article

Abstract: The paper studies application of upconverting nanoparticles as thermal history sensor. The main goal of the work is to develop phosphorescent coating for investigations of surface temperature distribution resulted from short duration and high energy thermal events such as small rocket engine testing. For that purpose, we developed thermal history paint with Gd2O3: Er3+, Yb3+, Mg2+ upconverting nanopowder. The developed paint was heated by Joule effect with precise control over temperature and heating time. Photoluminescence signal of cooled samples was excited with 980 nm laser and collected in automatic manner with use of an optical fibre probe connected to photospectrometer. The results show that irreversible changes of paint emission are temperature and heating time specific in range from 700 °C to 1150 °C. Calibration curves were prepared for investigated upconverting paint for heating times of 10, 60 and 180 seconds. Finally, 2D surface temperature samples were determined with use of upconverting thermal history paint and compared to IR camera and pyrometric measurements. The results indicate that uncertainty of temperature measurement below 10 °C was achieved for temperatures above 1000 °C. It has been demonstrated that developed thermal history paint allows for measurements of 2D surface temperature filed with high spatial resolution and good agreement to standard measurements techniques.

Source: Sensors and Actuators A Physical

DOI: 10.1016/j.sna.2024.115980