Sensor Yemhando Yevhu

Mungatiudze zvakawanda nezvemhedzisiro yemunyu pamhedzisiro yacho here? Pane here mhando yemhedzisiro ye capacitive effect ye double layer yemaion muvhu?

Zvingava zvakanaka kana mukandiratidza rumwe ruzivo nezvenyaya iyi. Ndiri kuda kuyera hunyoro hwevhu nemazvo.

Fungidzira dai paiva neconductor yakakwana yakakomberedza sensor (semuenzaniso, kana sensor yakanyudzwa mu liquid gallium metal), yaizobatanidza ma sensing capacitor plates kune mumwe nemumwe kuitira kuti insulator chete pakati pavo ive coating yakatetepa pa circuit board.

Aya masensa emagetsi asingadhuri, akavakirwa pamachipisi e555, anowanzo shanda pamafrequencies ari mumakumi ekHz, ayo akaderera zvakanyanya kuti abvise simba remunyu wakanyungudutswa. Anogona kunge akaderera zvakakwana kukonzera mamwe matambudziko akadai sekunyungudutswa kwe dielectric, izvo zvinozviratidza se hysteresis.

Ziva kuti bhodhi re sensor rinenge riri capacitor yakatevedzana ine circuit yakaenzana nevhu, rimwe riri kudivi rimwe nerimwe. Unogona zvakare kushandisa electrode isina chidzitiro isina kana coating kuti ubatanidzwe zvakananga, asi electrode ichanyungudika nekukurumidza muvhu.Kushandiswa kwemunda wemagetsi kunokonzera polarization muvhu + nharaunda yemvura. Kubvumidzwa kwakaoma kunoyerwa sebasa remunda wemagetsi wakashandiswa, saka polarization yezvinhu zvinogara zviri shure kwemunda wemagetsi wakashandiswa. Sezvo frequency yemunda wakashandiswa ichiwedzera kusvika pakakwirira MHz, chikamu chekufungidzira che complex dielectric constant chinoderera zvakanyanya sezvo dipole polarization isingachateveri high-frequency oscillations yemunda wemagetsi.

Pasi pe ~500 MHz, chikamu chekufungidzira che dielectric constant chinodzorwa nemunyu uye, nekudaro, conductivity. Pamusoro pema frequency aya, dipole polarization ichaderera zvakanyanya uye iyo yese dielectric constant inoenderana nehuwandu hwemvura.

Mazhinji masensa ekutengesa anogadzirisa dambudziko iri nekushandisa mafrequency akaderera uye kushandisa calibration curve kuti averenge hunhu hwevhu uye mafrequency aro.