Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm capacitive sensor
Capacitive sensors are based on various types of capacitors as sensing elements, because the measured changes will lead to capacitor capacitance changes, through the measurement circuit, the capacitance changes can be converted into electrical signal output. Measure the size of electrical signal, can judge the measured size. That's how capacitive sensors work.
Qhov zoo ntawm capacitive sensors
1, zoo kub stability
Tus nqi capacitance ntawm lub capacitive sensor feem ntau yog ywj siab ntawm cov khoom siv electrode, uas yog qhov tsim nyog rau kev xaiv cov ntaub ntawv uas tsis tshua muaj kub coefficient, thiab vim nws cov cua sov me me, me ntsis cuam tshuam rau kev ruaj ntseg. Lub sensor kuj muaj tooj liab poob, yooj yim rau cua sov xoom drift.
2. Cov qauv yooj yim
Capacitive sensors yog qhov yooj yim hauv cov qauv, yooj yim rau kev tsim thiab ua kom raug siab, thiab tuaj yeem ua me me kom ua tiav qee qhov kev ntsuas tshwj xeeb; tuaj yeem ua haujlwm hauv qhov kub thiab txias, muaj zog hluav taws xob thiab muaj zog sib nqus thiab lwm qhov chaw hnyav, tuaj yeem tiv taus qhov kub thiab txias hloov, tiv taus kev kub siab, kev cuam tshuam siab, overload, thiab lwm yam tuaj yeem ntsuas qhov sib txawv ntawm qhov kub thiab txias thiab tsis tshua muaj siab, kuj tuaj yeem ntsuas qhov sib nqus. ua haujlwm.
3. Zoo dynamic teb
Capacitive sensors vim lub electrostatic attraction ntawm lub phaj them yog me me (kwv yees li ob peb 10 (5) N), rau lub luag hauj lwm ntawm lub zog, thiab vim hais tias ntawm nws txav ib feem yuav ua tau heev me me yog nyias nyias, qhov zoo yog lub teeb heev, yog li nws qhov zaus ntawm lub hauv paus yog siab heev, lub sij hawm dynamic teb yog luv, tuaj yeem ua haujlwm raws li ob peb MHZ zaus, tshwj xeeb tshaj yog haum rau kev ntsuas dynamic. Thiab vim hais tias nws qhov nruab nrab poob yog me me tuaj yeem siv cov khoom siv hluav taws xob ntau dua, yog li lub kaw lus ua haujlwm ntau zaus. Nws tuaj yeem siv los ntsuas qhov ntsuas nrog kev hloov pauv ceev.
4, tsis yog -kev ntsuas kev sib cuag thiab siab rhiab heev
Tsis yog -kev ntsuas kev vibration lossis eccentricity ntawm rotating ncej, radial clearance ntawm me me pob bearings, thiab lwm yam. Thaum tsis siv -kev ntsuas kev sib cuag, capacitive sensor muaj qhov nruab nrab cov nyhuv thiab tuaj yeem txo qhov cuam tshuam ntawm workpiece nto roughness ntawm kev ntsuas.
Capacitance sensor in addition to the advantages of the above, but also because of the electrostatic attraction between the charged plate is very small, the required input force and input energy is very small, so it can measure very low pressure, force and very small acceleration, displacement, etc., can do very sensitive, high resolution, can sense 0.01μm or even smaller displacement. Due to the small loss of air and other media, the zero residual generated by the differential structure and connected to the bridge type is very small, so the circuit is allowed to carry out high magnification, so that the instrument has a high sensitivity.
Disadvantages ntawm capacitive sensors
1, siab tso zis impedance, tsis muaj peev xwm load.
No matter what type of capacitive sensor, limited by the geometric size of the electrode plate, its capacitance is very small, generally dozens to hundreds of skin method (pF), so that the output impedance of the capacitive sensor is very high, up to ω. Due to the high output impedance, the output power is small, the load capacity is poor, vulnerable to external interference and unstable phenomenon, and even can not work seriously.
2. Parasitic capacitance muaj txiaj ntsig zoo.
Tus thawj capacitance ntawm lub capacitive sensor yog me me, tab sis lub capacitance ntawm cov hlau lead cable txuas lub sensor thiab hluav taws xob Circuit Court, lub stray capacitance ntawm hluav taws xob Circuit Court thiab lub capacitance ntawm lub capacitor phaj thiab ib puag ncig tus neeg xyuas pib thiab lwm yam parasitic capacitance yog loj. . Lub hav zoov ntawm parasitic capacitance tsis tsuas yog txo qhov rhiab heev ntawm kev ntsuas, tab sis kuj ua rau cov zis tsis tawm. Vim hais tias tus kab mob parasitic capacitance yog random. Yog li ntawd, lub sensor yog nyob rau hauv ib tug tsis ruaj tsis khov ua hauj lwm lub xeev. cuam tshuam qhov ntsuas qhov tseeb.