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1. AN EMBEDDED PASSIVE RESONANT SENSOR USING FREQUENCY DIVERSITY
TECHNOLOGY FOR HIGH-TEMPERATURE WIRELESS MEASUREMENT
ABSTRACT
This paper presents an embedded wireless passive temperature sensor for measurements
in high-temperature applications, such as compressors and turbine engines. The performance of
the sensor was improved by optimizing its performance parameters. A high-temperature-resistant
material was used, and an embedded structure design was introduced to enable the sensor to
operate in high-temperature environments. A series LC resonant circuit containing a fixed
inductance coil and variable capacitance that varies with temperature was embedded in an
alumina ceramic substrate using high-temperature cofired ceramic technology. The temperature
in the high-temperature environment was detected wirelessly via the frequency diversity of the
sensor. Furthermore, the experimental results showed that the sensor can measure temperatures
ranging from room temperature to 1000 °C, and the average sensitivity of the sensor is ∼2
KHz/°C.