介紹了一種新型的無源、無線聲表面波傳感系統(tǒng)。傳感器單元無電源供電,傳感的能量來自外界的無線電磁波。傳感器單元間,輸入和輸出均采用非接觸的無線方式,無需電線連接。在聲表面波傳感器中,特殊叉指換能器構(gòu)造了無源無線編碼器和解碼器,它能對眾多傳感器單元編碼。該傳感器可廣泛應(yīng)用于各種智能結(jié)構(gòu)系統(tǒng)和工程應(yīng)用中。
關(guān)鍵詞:聲表面波;無源無線傳感;編碼傳感器;傳感系統(tǒng)
Abstract :A new passive and wireless Surface Acoustic Wave (SAW) sensor array is introduced. The energy of sensing comes from external radio electromagnetic wave. The sensing output is also transmitted in a contactless way ,so there is no2 cable connection for signal readout and power supply to the array or between the elements in the array. In the SAW sen2 sor ,special Inter2Digital transducer ( IDT) on a piezoelectric substrate constructs passive SAW encoding and decoding ele2 ment. The sensor elements are available to be embedded in various engineering materials to construct distributed wireless sensor array to realize the sensory function of smart material and structure.
Key words :SAW;passive wireless sensor ;coding sensor ; sensing system