An Impedance-Loaded Orthogonal Frequency-Coded SAW Sensor for Passive Wireless Sensor Networks

Abstract

A passive wireless impedance-loaded orthogonal frequency-coded (OFC) surface acoustic wave (SAW) sensor for wireless sensor networks was proposed in this paper. One of the chips on OFC SAW tag is connected to an external sensor, which could cause a phase shift in the time response of the corresponding part on the SAW device. The phase shift corresponds to the sensed quantity, which could be temperature, strain, vibration, pressure, etc. The OFC SAW tag is isolated by a proper package from the direct effect of the measurand on the device’s response which could avoid the multiple measurands coupling. The simultaneous work of multiple sensors is guaranteed by orthogonal frequency coding. By processing the response based on an extended matched filter algorithm, sensing information of the specific coded OFC device can be extracted from the superimposed response of multiple independent encoded sensors. Compared to previous methods, the proposed method can produce a more flexible passive (battery-free) wireless sensor suitable for large-scale wireless sensor networks. Simulation and experimental results demonstrate the effectiveness of the sensor.

3D Printed Pressure Sensor Based on Surface Acoustic Wave Resonator

“…Surface acoustic wave (SAW) gas pressure sensors are a good candidate for the gas pressure sensing application with the requirements of high accuracy and sensitivity [8]- [9]. The SAW sensors have the properties of small size, high accuracy and sensitivity, radiation hard and low cost, which can be operated with variable frequency and bandwidth in passive wireless mode [10]. SAW is a kind of wave that propagates on the surface of elastic solids.…”