Txoj Kev Xav thiab Kev Siv Hluav Taws Xob Static
Pendahuluuan
Hluav taws xob zoo li qub yog ib qho xwm txheej hluav taws xob uas tshwm sim thaum lub zog hluav taws xob sib sau ua ke rau ntawm qhov chaw ntawm ib yam khoom thiab tsis ntws mus tam sim ntawd, zoo li thaum muaj hluav taws xob tam sim no. Qhov xwm txheej no paub zoo rau lub neej txhua hnub: cov plaub hau sawv ntawm qhov kawg tom qab txhuam, cov npas dej lo rau ntawm phab ntsa, lossis qhov poob siab me ntsis uas koj tau txais thaum koj kov lub qhov rooj tom qab taug kev saum daim ntaub pua plag. Txawm hais tias zoo li yooj yim, hluav taws xob zoo li qub muaj lub hauv paus kev xav zoo hauv physics thiab muab cov txiaj ntsig zoo hauv ntau yam thev naus laus zis niaj hnub no.
Cov Ntsiab Lus Tseem Ceeb ntawm Hluav Taws Xob Static
Nyob rau theem microscopic, txhua yam khoom yog tsim los ntawm cov atoms, uas muaj ib lub nucleus (protons thiab neutrons) thiab cov electrons nyob ib puag ncig nws. Protons muaj cov nqi zoo, cov electrons muaj cov nqi tsis zoo, thiab neutrons yog nruab nrab. Nyob rau hauv cov xwm txheej ib txwm, tus naj npawb ntawm cov nqi zoo thiab tsis zoo yog sib npaug, ua rau ib yam khoom nruab nrab. Hluav taws xob static tshwm sim thaum muaj kev tsis sib npaug ntawm cov nqi vim yog kev hloov pauv ntawm cov electrons ntawm ib yam khoom mus rau lwm yam.
Qhov kev hloov pauv hluav taws xob no tuaj yeem tshwm sim vim muaj ntau yam txheej txheem. Qhov feem ntau yog kev sib txhuam (triboelectricity), piv txwv li, thaum siv tus pas ntsuas yas txhuam rau ntawm cov plaub hau. Lwm cov txheej txheem suav nrog kev sib txuas lus (kev sib cuag ncaj qha nrog cov khoom uas raug them) thiab kev sib txuas lus (kev cuam tshuam ntawm lub zog hluav taws xob ntawm cov khoom uas raug them yam tsis muaj kev sib cuag ncaj qha). Qhov tseem ceeb, hluav taws xob zoo li qub yog kev txhawj xeeb txog seb cov nqi raug khaws cia, hloov pauv, thiab cuam tshuam rau cov khoom nyob ib puag ncig li cas.
Coulomb Txoj Cai thiab Electrostatic Force
Qhov kev sib cuam tshuam ntawm cov nqi hluav taws xob yog piav qhia los ntawm Coulomb's Law. Txoj cai no hais tias lub zog ntawm kev rub lossis kev thawb ntawm ob lub nqi yog ncaj qha proportional rau cov khoom ntawm lawv qhov loj thiab inversely proportional rau lub square ntawm qhov deb ntawm lawv. Feem ntau, cov nqi zoo sib xws thawb ib leeg, thaum cov nqi tsis zoo sib xws rub ib leeg.
Txoj cai Coulomb yog qhov tseem ceeb vim nws tsim lub hauv paus rau kev nkag siab txog ntau yam teeb meem electrostatic, los ntawm kev nplaum ntawm hmoov av rau cov ntxaij vab tshaus TV mus rau kev tsim cov khoom siv hauv kev lag luam uas siv lub zog rub kom txav cov khoom tshwj xeeb.
Lub zog hluav taws xob thiab lub zog hluav taws xob
Ntxiv rau lub zog, hluav taws xob zoo li qub kuj nkag siab los ntawm lub tswv yim ntawm cov teb hluav taws xob. Lub teb hluav taws xob yog "cheeb tsam ntawm kev cuam tshuam" nyob ib puag ncig lub zog, qhov twg lwm cov nqi ntsib lub zog. Lub teb hluav taws xob yog piav qhia los ntawm cov kab teb uas tawm mus los ntawm lub zog zoo thiab mus rau hauv lub zog tsis zoo. Qhov ceev ntawm cov kab teb qhia txog lub zog ntawm lub teb: qhov ntau cov kab, qhov muaj zog dua.
Lub zog hluav taws xob yog qhov ntsuas ntawm lub zog muaj peev xwm ib chav them ntawm ib qho chaw. Qhov sib txawv ntawm lub zog (voltages) ua lub luag haujlwm tseem ceeb hauv kev tso hluav taws xob, piv txwv li hauv xob laim. Cov huab uas them tuaj yeem muaj qhov sib txawv loj heev ntawm lub zog hauv av, yog li thaum dhau qhov txwv, qhov dhia ntawm lub zog uas peb pom thaum xob laim tshwm sim.
Cov Txheej Txheem Them Nqi: Kev Sib Txhuam, Kev Sib Txuas Lus, thiab Kev Sib Tsoo
1. Kev them los ntawm kev sib txhuam
Thaum ob yam khoom raug txhuam ua ke, cov hluav taws xob tuaj yeem txav mus los ntawm ib qho chaw mus rau lwm qhov nyob ntawm seb cov khoom ntawd nyiam cov hluav taws xob li cas. Ib yam khoom muaj hluav taws xob tsis zoo (muaj cov hluav taws xob ntau dhau), thaum lwm yam muaj hluav taws xob zoo (muaj cov hluav taws xob tsis txaus).
2. Kev them los ntawm kev coj mus los
Yog tias ib yam khoom uas muaj hluav taws xob kov ib lub xov hlau uas tsis muaj hluav taws xob, qee yam ntawm cov hluav taws xob tuaj yeem hloov pauv, ua rau yam khoom tsis muaj hluav taws xob raug hluav taws xob. Cov xov hlau pab txhawb kev txav mus los ntawm cov hluav taws xob, ua rau cov hluav taws xob nkag mus rau hauv lawv qhov chaw.
3. Them nqi ntawm induction
Kev induction tshwm sim yam tsis muaj kev sib cuag. Ib yam khoom uas muaj charged raug coj los ze rau tus conductor neutral, ua rau cov electrons hauv tus conductor txav thiab sib cais (polarization). Yog tias tus conductor txuas nrog av thiab cov kev sib txuas raug tshem tawm raws li qhov sib lawv liag, tus conductor tuaj yeem tau txais net charge.
Cov Conductors, Insulators, thiab Charge Polarity
Cov ntaub ntawv muaj peev xwm muab faib ua pawg raws li lawv lub peev xwm los coj hluav taws xob. Cov khoom siv hluav taws xob xws li hlau (tooj liab, txhuas) muaj cov hluav taws xob dawb, uas ua rau cov nqi txav tau yooj yim. Cov khoom rwb thaiv tsev xws li yas, roj hmab, thiab iav muaj cov hluav taws xob khi nruj nreem, ua rau cov nqi "tuav" rau hauv cov chaw tshwj xeeb. Cov khoom siv semiconductor kuj muaj cov khoom nyob nruab nrab thiab tseem ceeb heev hauv kev siv hluav taws xob.
Hauv hluav taws xob static, cov insulators feem ntau yog qhov ua rau muaj hluav taws xob ntau vim tias cov hluav taws xob tsis yooj yim ntws mus rau lwm qhov. Qhov no yog vim li cas cov kev poob siab static feem ntau tshwm sim hauv huab cua qhuav: qhov av noo qis ua rau nws nyuaj rau cov hluav taws xob xau los ntawm cov chaw lossis huab cua.
Cov Teeb Meem Hluav Taws Xob Static hauv Lub Neej Txhua Hnub
Feem ntau suav tias hluav taws xob zoo li qub yog qhov ua rau neeg ntxhov siab, tab sis qhov tseeb nws yog ib qho uas tshwm sim ntau heev thiab kwv yees tau. Piv txwv li:
- Kev poob siab thaum kov ib yam khoom hlau, vim yog qhov tso tawm ntawm lub cev mus rau tus neeg coj hluav taws xob.
- Cov hmoov av lo rau ntawm cov ntxaij vab tshaus lossis cov yas vim tias cov hluav taws xob nyiam cov khoom me me uas raug them lossis polarized.
- Cov plaub hau sawv ntsug vim tias cov plaub hau uas muaj tib lub zog sib txhuam tawm tsam ib leeg tom qab txhuam rau ntawm lub zuag.
Xob laim, yog ib qho xwm txheej loj heev uas yog kev tawm ntawm cov huab thiab lub ntiaj teb lossis ntawm cov huab.
Cov Kev Siv Hluav Taws Xob Static hauv Ntau Qhov Chaw
Txawm hais tias qee zaum ua rau chim siab, hluav taws xob static siv rau hauv ntau daim ntawv thov:
1. Cov Tshuab Luam Ntawv thiab Cov Tshuab Luam Ntawv Laser
Cov thev naus laus zis ntawm lub tshuab luam ntawv thiab lub tshuab luam ntawv laser siv cov ntsiab cai electrostatic los xa cov toner (hmoov kua mem) mus rau ntawm daim ntawv. Lub nruas photoconductor raug them, tom qab ntawd qee qhov chaw raug tshem tawm los ntawm lub teeb (los ntawm daim ntawv lossis laser), tsim cov qauv them. Cov toner uas raug them raug rub mus rau qee qhov chaw, tom qab ntawd xa mus thiab cua sov kom lo rau ntawm daim ntawv tas mus li. Cov ntsiab cai no ua rau kev luam ntawv sai, ntse, thiab meej.
2. Kev Pleev Xim Hluav Taws Xob
Hauv kev lag luam tsheb thiab kev tsim khoom, kev pleev xim electrostatic yog siv los txhim kho kev ua haujlwm zoo thiab zoo ntawm cov xim pleev. Cov xim raug them, thaum cov khoom uas raug pleev xim raug muab qhov them rov qab lossis av. Yog li ntawd, cov xim pleev xim raug rub kom sib npaug rau ntawm qhov chaw ntawm cov khoom, txo cov khib nyiab thiab tsim cov txheej du. Txoj kev no kuj tseem muaj peev xwm ncav cuag cov chaw uas nyuaj rau ncav cuag nrog cov tshuaj tsuag ib txwm muaj.
3. Cov Khoom Siv Ua Kom Huv Si
Hauv cov chaw tsim khoom thiab cov chaw tsim hluav taws xob, cov khoom siv electrostatic precipitators siv los txo cov pa phem. Cov hmoov av lossis cov hmoov av hauv cov pa tawm raug them los ntawm ionization thiab tom qab ntawd nyiam rau cov phaj nrog cov nqi sib txawv. Cov khoom me me lo rau cov phaj thiab tom qab ntawd raug ntxuav tas li. Cov thev naus laus zis no muaj txiaj ntsig zoo hauv kev ntes cov khoom me me thiab pab ua raws li cov qauv pa phem.
4. Kev Sib Cais thiab Kev Rov Siv Dua Cov Khoom Siv
Hluav taws xob zoo li qub kuj siv los cais cov khoom sib xyaw raws li lawv lub peev xwm los txais lossis tso cov hluav taws xob. Hauv cov txheej txheem rov ua dua tshiab, piv txwv li, qee cov yas sib xyaw tuaj yeem cais tau siv cov hluav taws xob thiab qhov sib txawv ntawm kev them nyiaj los ntawm kev sib txhuam. Qhov no pab ua kom muaj kev ua haujlwm zoo ntawm kev cais cov khoom yam tsis tas yuav siv cov txheej txheem tshuaj lom neeg nyuaj.
5. Cov Ntawv Thov Hauv Kev Kho Mob thiab Kev Tshawb Fawb
Qee cov cuab yeej siv hauv chav kuaj siv cov zog electrostatic los tswj cov khoom me me, suav nrog cov aerosols thiab cov hmoov zoo. Hauv kev tshawb fawb microfluidic, cov ntsiab cai ntawm cov nqi hluav taws xob thiab cov teb tuaj yeem cuam tshuam rau kev txav mus los ntawm cov khoom me me lossis cov tee dej. Txawm hais tias ntau yam thev naus laus zis kho mob feem ntau cuam tshuam nrog hluav taws xob dynamic, lub tswv yim ntawm electrostatics tseem ceeb rau kev nkag siab txog kev sib cuam tshuam ntawm cov khoom them hauv cov chaw tshwj xeeb.
Kev Pheej Hmoo thiab Kev Tiv Thaiv: ESD thiab Kev Nyab Xeeb
Hauv cov khoom siv hluav taws xob, hluav taws xob zoo li qub tuaj yeem ua rau muaj kev phom sij loj heev los ntawm ESD (Electrostatic Discharge). Cov khoom siv rhiab heev xws li cov circuits sib xyaw thiab transistors tuaj yeem raug puas tsuaj los ntawm cov hluav taws xob me me uas tib neeg tsis pom. Yog li ntawd, cov tuam txhab tsim khoom siv hluav taws xob siv cov txheej txheem xws li cov hlua khi dab teg tiv thaiv hluav taws xob, cov chaw ua haujlwm tshwj xeeb, thiab kev tswj cov av noo.
Hauv cov lag luam uas siv cov khoom siv hluav taws xob uas yooj yim hlawv, hluav taws xob static kuj tuaj yeem ua rau muaj hluav taws xob txaus ntshai. Kev tiv thaiv yog ua tiav los ntawm kev sib txuas av kom zoo, siv cov khoom tiv thaiv static, thiab kev tswj cov kua lossis roj ntws kom tiv thaiv cov nqi hluav taws xob.
Xaus
Hluav taws xob zoo li qub yog ib qho tshwm sim los ntawm kev tsis sib npaug ntawm cov nqi uas tuaj yeem tshwm sim los ntawm kev sib txhuam, kev coj mus los, thiab kev coj mus los. Hauv kev xav, qhov tshwm sim no tau piav qhia los ntawm Coulomb Txoj Cai, lub tswv yim ntawm cov teb hluav taws xob, thiab lub zog hluav taws xob. Txawm hais tias feem ntau pom tias yog qhov teeb meem me me xws li kev poob siab lossis cov hmoov av, hluav taws xob zoo li qub yog lub hauv paus ntawm ntau yam thev naus laus zis tseem ceeb: cov tshuab luam ntawv laser, cov tshuab luam ntawv, cov xim pleev xim electrostatic, cov khoom ua kom muaj kuab paug, thiab kev sib cais cov khoom siv hauv cov txheej txheem kev lag luam. Kev nkag siab txog hluav taws xob zoo li qub tsis yog tsuas yog ua rau peb nkag siab dav txog physics xwb tab sis kuj pab peb tswj nws cov txiaj ntsig thiab kev pheej hmoo hauv lub neej niaj hnub no.
Yog tias koj xav tau, kuv tuaj yeem hloov kho tsab xov xwm no rau: (1) ib hom kev tshawb fawb rau cov haujlwm hauv tsev kawm ntawv/tsev kawm qib siab, (2) ib hom uas yooj yim dua, lossis (3) ntxiv cov qauv xam lej yooj yim thiab cov piv txwv raws li cov ntawv kawm.
