Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Study on ultrasonic temperature sensing technology of alumina single crystal
| DOI: | 10.11809/bqzbgcxb2023.06.024 |
| Keywords: | ultrasonic guided wave; temperature measurement; alumina single crystal ultrasonic wave guide; laser heated pedestal growth method |
| Abstract: | In order to solve the problems of poor oxidation resistance, short service life and low temperature measurement accuracy of sensors in the process of temperature measurement for aviation and aerospace engines, this paper firstly establishes an ultrasonic temperature measurement system by using the principle of ultrasonic guided wave temperature measurement, with alumina (α Al2O3) single crystal fiber being used as the ultrasonic wave guide. Secondly, this paper designs the sensitive element parameters of a sensor, and makes an ultrasonic temperature sensor by using the alumina single crystal ultrasonic wave guide grown by the laser heated pedestal growth method. Finally, the ultrasonic temperature sensor is calibrated. In a temperature range of 20 ℃ to 1 800 ℃ , the sensitivity of the sensor is 0.44 m/（s·℃） and the repeatability is 95.27%. A temperature measurement experiment is carried out on a simulated aero engine test platform, and the synthetic uncertainty of the measurement is analyzed to be 7.99 ℃. This method provides a new way to solve the problem of temperature measurement for aviation and aerospace engines in the harsh environment. |
| Published: | 2023-06-28 |
| PDF HTML | |