Abstract
In this study, an ultrasonic temperature measurement system was designed with Al2O3 high-temperature ceramic as an acoustic waveguide sensor and preliminarily tested in a high-temperature oxidation environment. The test results indicated that the system can indeed work stably in high-temperature environments. The relationship between the temperature and delay time of 26 °C–1600 °C ceramic materials was also determined in order to fully elucidate the high-temperature oxidation of the proposed waveguide sensor and to lay a foundation for the further application of this system in temperatures as high as 2000 °C.
Highlights
IntroductionHigh-temperature measurement is critically necessary in many fields including aerospace, production, energy, metallurgy, and various sectors of the chemical industry
High-temperature measurement is critically necessary in many fields including aerospace, production, energy, metallurgy, and various sectors of the chemical industry. It is crucial for the development of advanced engines and hypersonic missiles, for example, and other pieces of equipment subjected to ultra-high temperature environments due to combustion or high-speed friction
Based on the basic principles of ultrasonic temperature measurement, this paper examined several ultrasonic high temperature measurement methods
Summary
High-temperature measurement is critically necessary in many fields including aerospace, production, energy, metallurgy, and various sectors of the chemical industry. It is crucial for the development of advanced engines and hypersonic missiles, for example, and other pieces of equipment subjected to ultra-high temperature environments due to combustion or high-speed friction. Existing approaches to high-temperature measurement include the traditional thermocouple, thermal resistance, and other contact-type and non-contact type measurement instruments. Non-contact instruments work by measuring the thermal radiation of a detection target and obtaining the temperature parameters, but they do not work perfectly. Any non-contact temperature measurement process is affected by both the surrounding environment and the emissivity of the material object being tested. To accurately measure the temperature of different objects, it is necessary to first calibrate material emissivity through a high-precision device to ensure that the temperature measurement precision is lower than that of the sensor
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