Wireless Passive LC Temperature and Strain Dual-Parameter Sensor.

Ya Wang,Lei Zhang,Zhihong Fan,Qiulin Tan,Meipu Li,Baimao Lin

doi:10.3390/mi12010034

Abstract

There is an increasing demand for bearing temperature and strain monitoring in high-speed rotating systems. This study proposes a new multiresonance, multiplexing, wireless, passive inductance capacitance (LC) temperature and strain sensor. The sensor has two capacitors connected at different locations (turns) on the same inductor to achieve simultaneous temperature and strain measurements. The plate capacitor is connected to the inner part of the inductor and the other interdigital capacitor is connected to the outer part of the inductor to form two LC loops. The structure of the sensor is optimized through High Frequency Structure Simulator (HFSS) simulations to realize frequency separation of the two parameters and avoid mutual interference between the two signals. The sensor is fabricated on a polyimide film using electroplating technology. The experimental results show that the temperature–strain sensor can operate stably from 25 °C to 85 °C with an average sensitivity of 27.3 kHz/°C within this temperature range. The sensor can detect strains in the range of 1000–5000 με with a strain sensitivity of 100 Hz/με at 25 °C. Therefore, the proposed wireless passive LC temperature-strain sensor exhibits stable performance. In addition, the use of a single inductor effectively reduces the sensor’s area. The flexible substrate provides advantageous surface conformal attachment characteristics suitable for monitoring high-temperature rotating parts in adverse environments.

Highlights

There is an increasing demand for monitoring temperature, pressure, strain, and other parameters in high-speed rotating environments [1,2,3,4]
Yang et al [16] studied a super-sensitive wearable temperature sensor made of graphene nanowalls (GNWs), which can monitor body temperature in real time
The strain sensors proposed by Jia et al [17] and Fassler and Majidi [18] detect strength and fracture based on plane strain

Summary

Introduction

There is an increasing demand for monitoring temperature, pressure, strain, and other parameters in high-speed rotating environments [1,2,3,4]. During high-speed rotation of the bearing, the temperature of the bearing can increase abruptly due to friction, affecting the normal operation of the device [5]. The thermometers proposed by Rodriguez and Jia [15] are mainly used for temperature detection of rotating bearings. The strain sensors proposed by Jia et al [17] and Fassler and Majidi [18] detect strength and fracture based on plane strain. Mattmann et al [19] studied sensors for measuring textile strain. These sensors measure only a single physical quantity, which is limiting

Methods

Discussion

Conclusion