Yuav Ua Li Cas Noise Meter Sensors Ua Haujlwm
Lub suab nrov sensor muaj built-in condenser electret microphone uas rhiab rau lub suab. Electret nto yog qhov sib txawv ntawm lub nraub qaum electrode, thiab muaj qhov sib txawv me me hauv nruab nrab, tsim ib qho nruab nrab insulating nrog cov pa sib txawv thiab cov hluav taws xob, thiab cov electrode rov qab thiab cov hluav taws xob. Cov hlau txheej ntawm tus ncej lub cev ua raws li ob lub electrodes los tsim lub phaj capacitor. Nws muaj qhov tso zis electrode ntawm ob tug ncej ntawm lub capacitor. Vim tias muaj cov nqi pub dawb faib rau ntawm cov yeeb yaj kiab electret. Thaum lub suab nthwv dej ua rau cov yeeb yaj kiab electret vibrate thiab ua rau muaj kev hloov pauv, qhov kev ncua deb ntawm ob daim hlau ntawm lub capacitor hloov, ua rau lub capacitance hloov. Txij li tus naj npawb ntawm cov nqi ntawm cov hluav taws xob ib txwm nyob tas li, raws li cov qauv: Q=CU, Yog li, thaum C hloov pauv, nws yuav ua rau muaj kev hloov pauv hauv qhov hluav taws xob U hla lub capacitor, yog li tso tawm hluav taws xob teeb liab. thiab paub qhov hloov dua siab tshiab ntawm lub suab teeb liab mus rau hauv lub teeb liab hluav taws xob.
Tshwj xeeb, tag nrho cov nqi ntawm cov hluav taws xob tseem tsis hloov pauv. Thaum lub phaj retreats nyob rau hauv lub siab ntawm lub suab yoj, lub capacitance txo, thiab qhov voltage ntawm ob tug ncej ntawm lub capacitor yuav nce inversely. Ntawm qhov tsis sib xws, thaum lub capacitance nce, qhov voltage ntawm ob tug ncej ntawm lub capacitor yuav nce. Qhov hluav taws xob nruab nrab ntawm lawv yuav txo qis hauv qhov sib piv. Tom qab ntawd qhov hluav taws xob thoob plaws lub capacitor raug coj tawm los ntawm qhov ua haujlwm siab impedance, thiab lub suab nrov sensor ua kom nws nrov nyob rau tib lub sijhawm, kom cov hluav taws xob sib txuas nrog lub suab tuaj yeem tau txais. Txij li thaum lub teb cov nyhuv transistor yog ib qho khoom siv thiab yuav tsum muaj qee yam kev tsis ncaj ncees thiab tam sim no los ua haujlwm hauv lub xeev amplified, lub electret microphone yuav tsum ntxiv DC kev tsis ncaj ncees ua haujlwm.
Nws tuaj yeem pom los ntawm tsab ntawv tshaj tawm los ntawm Lub Koom Haum Saib Xyuas Kev Noj Qab Haus Huv (World Health Organization) tias lub suab nrov tau dhau los ua qhov txaus ntshai zais cia rau pej xeem kev noj qab haus huv tom qab huab cua muaj kuab paug, uas yog qhov hnyav dua li yav dhau los xav. Nrog rau qhov tsis sib xws ntawm kev npaj hauv nroog, lub suab nrov hauv ntau lub nroog tseem tsis tuaj yeem tswj tau zoo, tab sis kuv ntseeg tias nrog kev pab ntawm kev tshawb fawb thiab thev naus laus zis, kev tsim txom ntawm lub suab nrov tuaj yeem txo qis.
