Accurate Real-Time Temperature Measurement Method in Ultra-High Temperature Rotational Environments for Aero Engines/Turbines

This study proposes an innovative method to wirelessly measure the ultra-high temperatures of rotational parts in aero-engines/turbines. The upper measurement limit of this proposed sensor is
$1100 ^\circ \text{C}$
. Based on the thick film integration process, the inductor and capacitor are integrated in-situ on the ceramic turntable and ceramic blade. The inductor and capacitor operate in the high temperature and ultra-high temperature areas, respectively, and the temperature signal is transmitted through the electromagnetic coupling between the inductor coil and the antenna. The design of the structure separating the capacitor and inductors is important and can improve the sensor’s high temperature signal reading performance. The designed sensor is tested in the temperature range of 25–
$1100 ^\circ \text{C}$
and the rotational speed range of 0–400 rpm. The results show that the minimum sensitivity of the sensor at different rotational speeds is 7.66 kHz/
$^\circ \text{C}$
, and the minimum sensitivity of the sensor at different rotational speeds is 7.83 kHz/
$^\circ \text{C}$
. The maximum standard deviation and repeatability of the sensor measured across different temperatures and rotational speeds are 0.11(400 rpm, 900 °C)and 0.389%(400 rpm, 900 °C), respectively. The interference of the rotational speed on the temperature test of the sensor is negligible. The experimental results show that the sensor has strong signal strength in ultra-high temperature rotational environments and is suitable for ultra-high temperature testing.