傳感器采(cai)用(yong)了應(ying)力檢測(ce)法,檢測(ce)元件(jian)是壓(ya)電晶體(ti)(ti)(ti)(ti),漩(xuan)渦(wo)發生體(ti)(ti)(ti)(ti)為(wei)(wei)梯形柱形狀。壓(ya)電晶體(ti)(ti)(ti)(ti)用(yong)單片(pian)對分的(de)形式(shi)封裝在漩(xuan)渦(wo)發生體(ti)(ti)(ti)(ti)的(de)內部,優點是檢測(ce)元件(jian)不與被測(ce)流體(ti)(ti)(ti)(ti)直接(jie)接(jie)觸。兩(liang)片(pian)壓(ya)電晶體(ti)(ti)(ti)(ti)安裝在漩(xuan)渦(wo)發生體(ti)(ti)(ti)(ti)慣性(xing)力零彎矩端面內,中性(xing)面一(yi)側為(wei)(wei)壓(ya)應(ying)力,另(ling)一(yi)側為(wei)(wei)拉(la)應(ying)力。

　　質量流量計兩(liang)部分(fen)所(suo)(suo)產(chan)生(sheng)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)荷(he)極性(xing)相(xiang)(xiang)反,經電(dian)(dian)(dian)(dian)荷(he)放大器后,兩(liang)部分(fen)的(de)(de)(de)(de)信號疊加(jia),除掉共模(mo)干擾(rao)。放大器輸出(chu)與(yu)漩(xuan)渦頻率(lv)(lv)f成(cheng)(cheng)正比的(de)(de)(de)(de)信號,同時根據壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)效應,可求出(chu)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)晶(jing)(jing)(jing)體(ti)(ti)上產(chan)生(sheng)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)荷(he)q為(wei)(wei)(wei):q=∫σsd33dA式中:d33為(wei)(wei)(wei)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)常數;σs為(wei)(wei)(wei)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)晶(jing)(jing)(jing)體(ti)(ti)所(suo)(suo)承受的(de)(de)(de)(de)力;A為(wei)(wei)(wei)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)晶(jing)(jing)(jing)體(ti)(ti)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)極面積(ji)。q與(yu)FLf成(cheng)(cheng)正比,q=K1FLf。當漩(xuan)渦發生(sheng)體(ti)(ti)的(de)(de)(de)(de)形狀、尺寸、支撐方式固定(ding)后,壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)晶(jing)(jing)(jing)體(ti)(ti)輸出(chu)的(de)(de)(de)(de)交(jiao)變電(dian)(dian)(dian)(dian)荷(he)其(qi)頻率(lv)(lv)和f相(xiang)(xiang)同,幅值大小(xiao)(xiao)反映(ying)FLf的(de)(de)(de)(de)大小(xiao)(xiao)。壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)晶(jing)(jing)(jing)體(ti)(ti)所(suo)(suo)產(chan)生(sheng)的(de)(de)(de)(de)q包(bao)括兩(liang)部分(fen)信號:q的(de)(de)(de)(de)頻率(lv)(lv)是漩(xuan)渦產(chan)生(sheng)的(de)(de)(de)(de)頻率(lv)(lv)f,f的(de)(de)(de)(de)大小(xiao)(xiao)由式(1)決(jue)定(ding);q的(de)(de)(de)(de)幅值表示FLf的(de)(de)(de)(de)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。

　　以上內容就是給大家總結的關于氣體質量流量計傳感器(qi)結構的相關內容，大(da)家都有(you)進(jin)一(yi)步的認識了(le)，希望(wang)對大(da)家能有(you)所幫助，如果大(da)家還想了(le)解更多資訊，請繼續關注我們吧。