傳感器采用了應(ying)力(li)檢測(ce)法,檢測(ce)元(yuan)件(jian)是壓電(dian)晶體(ti),漩渦(wo)發生(sheng)(sheng)體(ti)為(wei)(wei)梯形柱形狀。壓電(dian)晶體(ti)用單片對(dui)分的(de)形式(shi)封裝在(zai)漩渦(wo)發生(sheng)(sheng)體(ti)的(de)內部,優點(dian)是檢測(ce)元(yuan)件(jian)不與被測(ce)流(liu)體(ti)直接接觸。兩(liang)片壓電(dian)晶體(ti)安裝在(zai)漩渦(wo)發生(sheng)(sheng)體(ti)慣性(xing)力(li)零彎矩(ju)端面內,中性(xing)面一(yi)側(ce)為(wei)(wei)壓應(ying)力(li),另一(yi)側(ce)為(wei)(wei)拉應(ying)力(li)。

　　質量流量計兩(liang)部分所產(chan)生(sheng)的電(dian)(dian)(dian)(dian)(dian)荷極性相反(fan),經電(dian)(dian)(dian)(dian)(dian)荷放(fang)(fang)大器(qi)后,兩(liang)部分的信號疊加,除掉共模干擾。放(fang)(fang)大器(qi)輸出與漩(xuan)渦頻(pin)率(lv)f成正比(bi)的信號,同(tong)(tong)時(shi)根據(ju)壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)效應(ying),可求出壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)晶體(ti)(ti)(ti)上產(chan)生(sheng)的電(dian)(dian)(dian)(dian)(dian)荷q為(wei)(wei):q=∫σsd33dA式(shi)(shi)中:d33為(wei)(wei)壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)常(chang)數;σs為(wei)(wei)壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)晶體(ti)(ti)(ti)所承受的力;A為(wei)(wei)壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)晶體(ti)(ti)(ti)的電(dian)(dian)(dian)(dian)(dian)極面積。q與FLf成正比(bi),q=K1FLf。當漩(xuan)渦發(fa)生(sheng)體(ti)(ti)(ti)的形狀、尺(chi)寸、支撐方(fang)式(shi)(shi)固定后,壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)晶體(ti)(ti)(ti)輸出的交變(bian)電(dian)(dian)(dian)(dian)(dian)荷其頻(pin)率(lv)和f相同(tong)(tong),幅值大小(xiao)(xiao)反(fan)映(ying)FLf的大小(xiao)(xiao)。壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)晶體(ti)(ti)(ti)所產(chan)生(sheng)的q包(bao)括兩(liang)部分信號:q的頻(pin)率(lv)是漩(xuan)渦產(chan)生(sheng)的頻(pin)率(lv)f,f的大小(xiao)(xiao)由式(shi)(shi)(1)決定;q的幅值表示FLf的大小(xiao)(xiao),即:q=K1FLf=±CLf×0.5ρv12S0K1

　　通過檢測壓電元件的電荷強度就可以同時得到漩渦頻率和橫向變動升力兩個變量,這種一箭雙雕的作法在流量檢測領域是十分罕見的,同時這也是漩渦式氣體質量流量計的主要特點。

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