Abstract
Measurement technology for various key parameters in harsh environments (e.g., high-temperature and biomedical applications) continues to be limited. Wireless passive LC resonant sensors offer long service life and can be suitable for harsh environments because they can transmit signals without battery power or wired connections. Consequently, these devices have become the focus of many current research studies. This paper addresses recent research, key technologies, and practical applications relative to passive LC sensors used to monitor temperature, pressure, humidity, and harmful gases in harsh environments. The advantages and disadvantages of various sensor types are discussed, and prospects and challenges for future development of these sensors are presented.
Highlights
Harsh environments can typically be subdivided into high-temperature, biocompatible, corrosive and chemical, etc
Typical commercial wireless passive sensors can be divided into surface acoustic wave (SAW), RF identification (RFID), intermodulation sensor, and RF-powered LC sensor
In 2013, researchers at the North University of China, which has been committed to developing wireless, high-temperature passive LC ceramic pressure sensors, introduced a unique screen-printing process involving a sacrificial layer of ESL 4900 to prevent deformation of a capacitive embedded cavity during lamination and sintering
Summary
Harsh environments can typically be subdivided into high-temperature, biocompatible, corrosive and chemical, etc. Wireless passive sensors used in these harsh-environment applications can be categorized as high-temperature, biocompatible, and humidity and gas sensors (Table 1). In some special industrial applications, wireless sensors are required to measure humidity or detect harmful gases. Wireless passive LC sensors are composed of inductance and capacitance and do not require wired connections to transmit signals. They are potential for complex applications in harsh environments. Numerous studies have investigated passive LC sensors to measure pressure, temperature, and humidity in harsh environments. This paper summarizes the wireless measurement principle, model design, and latest research on passive LC sensors applied to monitor pressure, temperature, humidity, and harmful gases.
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