Compared with modulation based radio sensors, the passive and telemetric surface acoustic wave (SAW) sensors are absolutely necessary in some special environment applications.

• 无线传感系统是传感器的一个研究热点，与基于调制解调的无线传感器相比，基于声表面波的无线传感器在许多特殊场合日益显示出其必要性和重要性。