La 21 Tšitoe 21:38:37 CST 2021
Maekerofounu ea Electret e na le phetoho ea motlakase oa acoustic le phetoho ea impedance.Karolo ea bohlokoa ea phetoho ea acoustoelectric ke electret diaphragm.Ke filimi e tšesaane haholo ea polasetiki, eo ho eona lesela la filimi e hloekileng ea khauta le fetohang mouoane ka lehlakoreng le leng.Joale, ka mor'a electret ea matla a matla a motlakase a phahameng, ho na le litefiso tsa anisotropic mahlakoreng ka bobeli.Sebaka sa khauta se fetohileng mouoane sa diaphragm se ka ntle 'me se hokahane le khetla ea tšepe.Lehlakore le leng la diaphragm le arotsoe ho poleiti ea tšepe ka lesale le tšesaane le sireletsang.Ka tsela ena, capacitance e thehoa pakeng tsa filimi ea khauta e evaporated le poleiti ea tšepe.Ha electret diaphragm e kopana le acoustic vibration, sebaka sa motlakase lintlheng tse peli tsa capacitor se fetoha, e leng se etsang hore ho be le voltage e fapaneng e fapaneng le phetoho ea maqhubu a acoustic.Bokhoni bo pakeng tsa electret diaphragm le poleiti ea tšepe e batla e le nyane, ka kakaretso mashome a PF.Ka hona, boleng ba eona ba ho itšireletsa bo phahameng haholo (XC = 1 / 2 ~ TFC), e ka bang mashome a megaohms kapa ho feta.Tšitiso e phahameng joalo e ke ke ea tsamaisana ka kotloloho le amplifier ea molumo.Ka hona, transistor ea "junction field effect" e hokahane le maekrofono bakeng sa phetoho ea impedance.FET e tšoauoa ka ho kenella ho hoholo ho phahameng le palo e tlase ea lerata.FET e tloaelehileng e na le li-electrode tse tharo: li-electrode tse sebetsang, li-electrode (g) le li-electrode tsa drain (d).Mona, ho sebelisoa FET e khethehileng e nang le diode e 'ngoe pakeng tsa mohloli oa ka hare le marang-rang.Sepheo sa diode ke ho sireletsa FET ho tloha tšusumetsong e matla ea matšoao.Heke ea FET e hokahane le poleiti ea tšepe.Ka tsela ena, ho na le mela e meraro ea tlhahiso ea electret microphone.Ka mantsoe a mang, mohloli s hangata ke terata ea polasetiki e putsoa, draina D hangata ke terata e khubelu ea polasetiki 'me terata e lohiloeng e sireletsang e kopanyang khetla ea tšepe.
Nako ea poso: Aug-28-2023