Abstract
It has since long been known that surface acoustic wave (SAW) devices, resonators as well as delay lines, can be used as passive wireless sensors for physical quantities, like temperature and pressure, as well as gas sensors or identification-tags (ID-tags). The sensors are robust, work passively without a battery, can be applied at high temperatures, and provide a high resolution. Nevertheless, if the devices are used wirelessly in an industrial environment, several constraints have to be taken into account, especially when more than one quantity or device needs to be measured at the same time. The paper addresses the challenges that must be tackled when establishing multi-sensor-wireless-readout for industrial applications. Major issues here are the legal regulations for industrial, scientific and medical frequency bands (ISM-bands), as well as sampling time and costs, which impose severe restrictions to any system design. We describe several design approaches and their constraints. We successfully designed sensors based on reflective delay lines that allow the parallel readout of four independent temperature sensors in the 2.45 GHz ISM-band. These devices were fabricated and positively tested, demonstrating the applicability of SAW sensors for industrial applications.
Highlights
Introduction to surface acoustic wave (SAW) SensorsSAW sensors can provide significant advantages in industrial sensing as they can be readout wirelessly, work passively, and can sustain high temperatures
This paper describes the general design considerations that have to be taken into account if SAW sensors are to be used in industrial applications and demonstrates a successful example for a wireless simultaneous readout of four temperature sensors
The goal of this work was to realize a multi sensor temperature readout based on SAW technology for the operation range from room temperature up to 300 ◦ C and performance estimations for an attached antenna radio frequency (RF) link
Summary
SAW (surface acoustic wave) sensors can provide significant advantages in industrial sensing as they can be readout wirelessly, work passively, and can sustain high temperatures. It has been shown by many groups that different physical and chemical quantities can be measured with these devices [1,2,3,4,5,6,7,8,9,10]. This paper describes the general design considerations that have to be taken into account if SAW sensors are to be used in industrial applications and demonstrates a successful example for a wireless simultaneous readout of four temperature sensors.
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