No abstract

Traditional thin-film thermocouples have limitations in measuring real surface temperature changes in aircrafts because the connection between the nanofilm and the leads can easily fail. However, how to improve the weak connection has rarely been mentioned in previous studies. In this study, a lead-embedded alumina ceramic substrate is proposed to improve the durability of thin-film thermocouples. Multilayer two-dimensional nanofilms with different thin-film electrode lengths were prepared on a substrate using DC-pulsed magnetron sputtering. Furthermore, the effect of the thin-film electrode length on the sensitivity, response time, and measurement error of the sensor was investigated. The electrode length did not affect the sensitivity and response time; however, as it increased, the temperature measurement error decreased. In addition, the static and dynamic performance, repeatability, measurement accuracy, and service lifetime of the developed sensor were verified. The results showed that the sensor had high sensitivity and linearity and good repeatability, with the response time being in microseconds. The sensor can continue to operate at 500 ℃ for more than 2 h with no signal interruption. The sensor accuracy was 0.43% at 300 ℃.