A measurement system of high-temperature oxidation environment with ultrasonic Ir0.6Rth0.4 alloy thermometry

Ultrasonics. 2018 Sep:89:102-109. doi: 10.1016/j.ultras.2018.04.001. Epub 2018 Apr 3.

Abstract

Iridium-rhodium is generally applied as a thermocouple material, with max operating temperature about 2150 °C. In this study, a ultrasonic temperature measurement system was designed by using Iridium-rhodium (60%Ir-40%Rh) alloy as an acoustic waveguide sensor material, and the system was preliminarily tested in a high-temperature oxidation environment. The result of ultrasonic temperature measurement shows that this system can indeed work stably in high-temperature oxidation environments. The relationship between temperature and delay time of ultrasonic thermometry up to 2200 °C was illustrated. Iridium-rhodium materials were also investigated in order to fully elucidate the proposed waveguide sensor's performance in a high-temperature oxidation environment. This system lays a foundation for further application of high-temperature measurement.

Keywords: Delay time; High-temperature oxidation; Iridium-rhodium (60%Ir–40%Rh); Ultrasonic concentrator; Ultrasonic thermometry; Ultrasonic wavelets.