Lub capacitive siab sensor yog tsim los ntawm ob daim txav (elastic hlau diaphragm), ob daim ruaj khov (hlau txheej ntawm cov iav concave nyob rau sab sauv thiab qis elastic diaphragm), tso zis terminals thiab vaj tse, thiab lwm yam. Ob lub capacitors yog tsim los ntawm kev txav mus los. phaj thiab ob daim hlau ruaj.Thaum cov khoom siv siab ua rau ntawm lub diaphragm elastic, lub diaphragm elastic ua rau kev hloov pauv, uas yog khi kom txo qhov kev ncua deb nrog ib daim taag, thiab nce qhov kev ncua deb nrog rau lwm daim (tuaj yeem pom los ntawm ib daim ntawv).Qhov kev ncua deb ntawm ob hlau electrodes yog ib qho tseem ceeb cuam tshuam rau lub capacitance, qhov kev ncua deb nce, lub capacitance txo, qhov kev ncua deb txo, lub capacitance nce.Cov qauv no yog hu ua cov qauv sib txawv uas qhov tsis sib xws ntawm ob lub ntsiab lus tau hloov pauv los ntawm tib tus nqi tab sis rov qab vim qhov ntsuas ntau.
Yog hais tias lub elastic diaphragm muab tso rau nruab nrab ntawm sab siab thiab atmospheric siab (lub sab sauv kab noj hniav ntawm elastic diaphragm yog atmospheric), qhov ntsuas siab yog lub rooj;Yog hais tias lub elastic diaphragm muab tso rau nruab nrab ntawm lub siab sab thiab lub nqus tsev vacuum (lub sab sauv kab noj hniav ntawm elastic diaphragm dhau los ntawm lub tshuab nqus tsev), lub siab siab yog ntsuas.Lub peev xwm ntawm lub capacitor yog proportional rau dielectric thiab nws cov txheeb ze zoo cheeb tsam ntawm ob daim hlau ntawm lub capacitor, thiab inversely proportional rau qhov kev ncua deb ntawm ob daim hlau, uas yog, C = ε A / D, qhov twg ε yog dielectric tas li. ntawm dielectric, A yog qhov sib txheeb zoo thaj tsam ntawm ob lub hlau electrodes, D yog qhov kev ncua deb ntawm ob hlau electrodes.Los ntawm qhov kev sib raug zoo no, nws tuaj yeem pom tau tias thaum ob qho ntawm qhov tsis hloov pauv thiab lwm qhov kev ntsuas yog siv los ua qhov sib txawv, lub capacitance yuav hloov nrog qhov hloov pauv.
Muaj ntau hom kev ntsuas hluav taws xob siv nrog lub capacitive siab sensor.Cia peb coj tus choj Circuit Court ua piv txwv los piav qhia txog lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm lub peev xwm sib txawv sensor ntsuas Circuit Court.Vim tias lub capacitance yog AC parameter, tus choj zoo siab los ntawm AC los ntawm kev hloov pauv.Transformer ob coil thiab capacitance ntawm ib tug choj, thaum tsis muaj inlet siab, ib tug choj nyob rau hauv tshuav nyiaj li cas, thiab ob capacitance qhov tseem ceeb yog sib npaug zos rau C0, thaum lub siab nyhuv, ib tug capacitance tus nqi ntawm C0 + delta C, lwm capacitance tus nqi ntawm C0 - delta , C (delta C rau sab nraud siab tshwm sim los ntawm kev hloov pauv ntawm lub peev xwm), yog tus choj tawm ntawm qhov sib npaug, Qhov twg tus nqi capacitance siab, qhov voltage kuj tseem siab, thiab qhov sib txawv voltage yog tsim los ntawm ob lub capacitors, los ntawm qhov uas tus nqi capacitance yog siab. choj tsim ib qhov hluav taws xob tso zis U uas sawv cev rau lub siab kom tsawg.
Post lub sij hawm: Sep-02-2022