A Resonant Coding Passive Wireless SAW Sensor Array System

摘要

This paper introduces a novel coding resonant SAW passive wireless sensing system. A composite sensor structure with a resonator, a delay line and matching circuit is designed and the sensor system is constructed. It analyses sensor impulse response and response to sinusoidal burst signal input. The frequency of the response signal is related to sensing parameter. The delay time of the response signal is used to encode sensor elements. The duration of input signal has a significant effect to waveform and amplitude of response. An optimal duration of exciting burst signal can be selected. Because the composite structure can combine both sensitivity of high Q SAW resonator and massive coding ability of delay line, this coding resonant sensor can be used in long distance and large-scale distributed measurement as well.