编码式谐振SAW无源无线温度传感阵列系统

A Coding Resonant Passive Wireless SAW Temperature Sensing System

提出了一种新型编码式谐振声表面波无源无线温度传感系统。该传感系统采用间歇正弦脉冲串信号作为无线激励信号 ,而经谐振式声表面波器件延迟后的反射波是一瞬时变化的振荡波形 ,该反射信号的频率与声表面波器件固有频率相关。温度改变 ,其反射信号的频率也发生变化。该传感阵列系统利用不同延迟线构成编码器 ,可实现大规模的传感器构造。该方法不仅有谐振式无源无线传感器距离远的优点 ,而且 ,还具有延迟型大规模编码的优点。

This paper introduces a new coding SAW passive wireless temperature sensing system. The input signal of the sensing system is constructed by an interval sinusoidal signal and the response of its reflecting signal is an oscillating signal. And the frequency of the reflecting signal is related to the natural frequency of the SAW chip which is changed with temperature. Because using the delay line to construct coder, the sensor array can realize large scale measurement. This method can be employed not only in the long distance, but also in the large scale. Besides, it can be used in passive wireless ID tag.