NgoLwesibini Dec 21 21:38:37 CST 2021
Imakrofoni ye-Electret ibandakanya ukuguqulwa kombane we-acoustic kunye nokuguqulwa kwe-impedance.Into ephambili yokuguqulwa kwe-acoustoelectric yi-electret diaphragm.Yifilimu yeplastiki ecekeceke kakhulu, apho umaleko wefilimu yegolide esulungekileyo uguquke ube ngumphunga kwelinye icala.Emva koko, emva kwe-electret yendawo yombane yamandla aphezulu, kukho iintlawulo ze-anisotropic kumacala omabini.Umphezulu wegolide okhutshiweyo we-diaphragm ungaphandle kwaye udibene neqokobhe lesinyithi.Elinye icala le-diaphragm lahlulwe kwipleyiti yentsimbi ngendandatho encinci ekhuselayo.Ngale ndlela, i-capacitance yenziwa phakathi kwefilimu yegolide ephuhliweyo kunye nepleyiti yesinyithi.Xa i-electret diaphragm idibana ne-acoustic vibration, indawo yombane kwiziphelo zombini ze-capacitor iyatshintsha, okukhokelela ekutshintsheni kwe-voltage eguquguqukayo kunye nokutshintsha kwe-acoustic wave.I-capacitance phakathi kwe-electret diaphragm kunye nepleyiti yensimbi incinci, ngokuqhelekileyo amashumi e-PF.Ngoko ke, ixabiso layo lemveliso ye-impedance liphezulu kakhulu (XC = 1 / 2 ~ TFC), malunga namashumi e-megaohms okanye ngaphezulu.I-impedance ephezulu enjalo ayinakuhambelana ngokuthe ngqo nesandisi somsindo.Ke ngoko, i-junction field effect transistor iqhagamshelwe kwi-microphone yokuguqulwa kwe-impedance.I-FET iphawulwa ngokuphazamiseka kwegalelo eliphezulu kunye nenani eliphantsi lengxolo.I-FET eqhelekileyo inee-electrode ezintathu: i-electrode esebenzayo (s), i-electrode yegridi (g) kunye ne-drain electrode (d).Apha, i-FET ekhethekileyo kunye nenye i-diode phakathi komthombo wangaphakathi kunye negridi isetyenziswa.Injongo ye-diode kukukhusela i-FET kwimpembelelo yesignali enamandla.Isango leFET liqhagamshelwe kwipleyiti yentsimbi.Ngale ndlela, kukho imigca emithathu yokukhupha imakrofoni ye-electret.Oko kukuthi, umthombo s ngokubanzi lucingo lweplastiki eluhlaza okwesibhakabhaka, idreyini D ngokuqhelekileyo lucingo lweplastiki olubomvu kunye nocingo olulukiweyo olukhuselayo oludibanisa iqokobhe lesinyithi.
Ixesha lokuposa: Aug-28-2023