This paper aims to solve the problems of traditional active sensors in aerospace, energy exploitation and pipeline transportation, such as high temperature test limit, low sensitivity and large data disturbance. To this end, this paper proposes a metamaterial temperature sensor based on a complementary split-ring resonator (CSRR) for extremely environments.
High-frequency electromagnetic simulation software was used to model and optimize the CSRR-based metamaterial temperature sensor, the key parameters were analyzed and the influence of thermal expansion effect was verified by simulation. The sensor with alumina ceramic substrate was prepared using the high-temperature co-fired ceramic process, and its temperature sensing performance and stability in the range of 25 °C to 1650 °C were verified by an experimental test platform.
The metamaterial temperature sensor based on CSRR structure designed in this study shows excellent stability in the range of 25–1650 °C, and the resonant frequency shows a good linear relationship with temperature. When the temperature was increased from 25 to 1650 °C, the frequency was shifted by 0.43875 GHz and the sensitivity was 270 kHz/°C, which verified its reliability and long-term working ability in an extreme environment.
In this paper, CSRR metamaterial structure is combined with high-temperature alumina ceramic substrate to realize the stable operation of wireless passive microwave temperature sensor under the extreme environment of 1650 °C. Its core value is to break through the high temperature measurement bottleneck of traditional sensor and anti-interference reliable solution for harsh environment monitoring in aerospace, energy, chemical industry and other fields.
