Micro/Nano Systems Integration R&D Centre, School of Microelectronics, University of Science and Technology of China, Hefei 230026, China.
School of Electrical Engineering, Southeast University, Nanjing 210096, China.
Sensors (Basel). 2022 Apr 14;22(8):3024. doi: 10.3390/s22083024.
This paper presents the LC-type passive wireless sensing system for the simultaneous and independent detection of triple parameters, featuring three different capacitive sensors controlled by two mechanical switches. The sensor coil was connected with three different capacitors in parallel and two mechanical switches were in series between every two capacitors, which made the whole system have three resonant frequencies. The readout coil was magnetically coupled with the sensor coil to interrogate the sensor wirelessly. The circuit was simulated advanced design system (ADS) software, and the LC sensor system was mathematically analyzed by MATLAB. Results showed that the proposed LC sensing system could test three different capacitive sensors by detecting three different resonant frequencies. The sensitivity of sensors could be determined by the capacitance calculated from the detected resonant frequencies, and the resolution of capacitance was 0.1 PF and 0.2 PF when using the proposed sensor system in practical applications. To validate the proposed scheme, a PCB inductor and three variable capacitors were constructed with two mechanical switches to realize the desired system. Experimental results closely verified the simulation outputs.
本文提出了一种 LC 型无源无线传感系统，用于同时、独立地检测三个参数，该系统由三个不同的电容传感器组成，由两个机械开关控制。传感器线圈与三个不同的电容并联，两个机械开关串联在每两个电容之间，这使得整个系统具有三个谐振频率。读取线圈与传感器线圈磁耦合，以无线方式询问传感器。该电路在先进设计系统（ADS）软件中进行了模拟，并使用 MATLAB 对 LC 传感器系统进行了数学分析。结果表明，所提出的 LC 传感系统可以通过检测三个不同的谐振频率来测试三个不同的电容传感器。通过检测到的谐振频率计算电容，可以确定传感器的灵敏度，在实际应用中，使用所提出的传感器系统时，电容的分辨率为 0.1PF 和 0.2PF。为了验证所提出的方案，用两个机械开关构建了一个 PCB 电感器和三个可变电容，以实现所需的系统。实验结果与模拟结果吻合较好。
