Disadvantages ntawm sensors capacitive
1 siab tso tawm impedance, pluag load peev
Txawm tsis muaj lub hom capacitive sensor, lub capacitance yog me me, feem ntau kaum rau pua pua ntawm picofarads (pF), yog li cov zis impedance ntawm lub capacitive sensor yog siab heev. ~ Ω. Vim tias muaj siab tso tawm impedance, lub zog tso zis me me, lub peev xwm ua tsis zoo, thiab nws yog susceptible rau sab nraud disturbances, uas yuav ua rau instability. Nyob rau ntau zaus, nws yuav tsis ua haujlwm.
2 Cov kab mob parasitic muaj peev xwm loj tuaj
Lub peev txheej ntawm lub capacitance pib me me, thiab cov kab ua lag luam ntawm cov hlau lead uas siv lub tshuab ua hluav taws xob txuas thiab lub xov tooj hluav taws xob, qhov hluav taws xob hluav taws xob ntawm qhov hluav taws xob, thiab qhov muaj peev xwm ua los ntawm cov phaj capacitor thiab cov neeg ua haujlwm nyob ib puag ncig. Lub xub ntiag ntawm cov kab mob parasitic tsis tsuas yog txo cov kev ntsuas, tab sis kuj ua rau cov zis nonlinear. Vim hais tias lub cev tsis muaj peev xwm hloov tsis tau zoo dua. Yog li no, tus sensor yog nyob rau hauv ib qho chaw ua haujlwm tsis ruaj nreg. Cuam tshuam kev ntsuas.