Abstract
Inductor–capacitor (LC) passive wireless sensors are widely used for remote sensing. These devices are limited in applications where multiparameter sensing is required, because of the mutual coupling between neighboring sensors. This article presents two effective decoupling techniques for multiparameter sensing, based on partially overlapped sensors and decoupling coils, which, when combined, reduce the mutual coupling between sensors to near zero. A multiparameter LC sensor prototype with these two decoupling mechanisms has been designed, simulated, and measured. This prototype is capable of simultaneously measuring four parameters. The measurements demonstrate that the changes in capacitance in one individual sensor do not affect the measurements of the other sensors. This principle has been applied to simultaneous wear sensing using four identical wear sensors.
Highlights
Wireless sensors are useful and desirable in many emerging and industrial applications
The implementation of wireless multiparameter passive sensors would increase the density of sensing, and simplify monitoring and processing, which are key issues in the Internet of Things (IoT) world
When the overlap is not possible, another alternative and simple way is by using an additional decoupling coil [16,17,18,19] that transfers and inverts a small portion of the magnetic flux from one LC sensor to the other (Figure 3b)
Summary
Wireless sensors are useful and desirable in many emerging and industrial applications. A special inductor structure for stacked inductors based on the partial inductance theory has been proposed [7,12] in order to minimize magnetic coupling between stacked inductances This concept achieves a compact design, but the magnetic coupling between each individual LC sensor and the readout coil antenna is drastically reduced; its sensitivity and read range are shortened. Another option is to integrate a switch into the LC sensor system [13], and making a time-domain measurement. The proposed configuration allows for reading multiple sensors using the same readout coil antenna
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