超聲波液位傳感器將傳感技術與電信號處理結合在一起,用來測量敞開或密封容器中(zhōng)的液體液位。傳感器裝有超聲波傳感器及(jí)溫度感應元件。傳感器由探頭發射一係列超聲波脈衝,而(ér)超聲波脈衝遇到液麵後返回,被傳感器接收。傳感器中的濾波(bō)裝置可從來自聲(shēng)波、電波噪聲及轉動攪拌器漿葉噪聲的各種 假回波中分辨出從液麵上返回的真回波,脈衝波從發射到(dào)液麵、再返回到傳感器所用的時間經(jīng)溫度補償後,轉換成可(kě)顯示的距離,並(bìng)轉變為電流輸出。
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