Cov keyboards sib thooj yog cov sensors uas kuaj pom muaj lub hom phiaj yam tsis muaj kev sib cuag ntawm lub cev. Lawv tau siv dav hauv kev lag luam automation, kev ruaj ntseg tshuab, thiab cov khoom siv hluav taws xob. Nyob ntawm lawv txoj kev khiav hauj lwm thiab cov khoom uas lawv ntes tau, cov kev sib thooj sib thooj tuaj yeem raug categorized li inductive, capacitive, photoelectric, thiab magnetic. Cov hom keyboards no txawv heev ntawm lawv cov yam ntxwv, cov xwm txheej siv tau, thiab kev ua haujlwm.
Inductive sib thooj keyboards siv lub hauv paus ntsiab lus ntawm electromagnetic induction kom ua tiav kev sib cuag tsis tau los ntawm kev txheeb xyuas cov kev hloov pauv hauv cov hlau nplaum los ntawm cov khoom hlau. Lawv qhov zoo muaj xws li cov lus teb ceev ceev thiab muaj zog tiv thaiv - muaj peev xwm cuam tshuam, tab sis lawv tsuas yog tsim nyog rau cov ntaub ntawv hlau thiab muaj qhov ntsuas pom luv luv (feem ntau yog ob peb millimeters mus rau ob peb centimeters). Cov keyboards no feem ntau siv los nrhiav cov khoom hlau hauv cov cuab yeej siv tshuab thiab cov kab ntau lawm.
Capacitive sib sib zog nqus keyboards ua haujlwm los ntawm kev kuaj xyuas cov kev hloov pauv ntawm cov khoom siv los ntawm kev txav mus los thiab tuaj yeem paub qhov txawv ntawm cov hlau thiab tsis yog{0}}hlau (xws li yas, kua, lossis hmoov). Lawv muaj ntau yam kev tshawb nrhiav pom tab sis muaj kev cuam tshuam rau lwm yam xws li ambient humidity thiab kub. Lawv tsim nyog rau kev soj ntsuam cov kua dej los yog tsis yog- kuaj pom cov khoom hlau.
Photoelectric sib thooj keyboards cia siab rau qhov cuam tshuam los yog kev xav ntawm infrared lossis laser beams los ntes cov khoom. Lawv tau categorized li los ntawm -beam, diffuse reflective, thiab specular reflective hom. Lawv qhov zoo nyob hauv lawv qhov tsis yog-kev sib cuag thiab qhov ntev- nrhiav pom ntau yam (txog li ob peb meters). Txawm li cas los xij, lawv raug cuam tshuam los ntawm kev cuam tshuam los ntawm cov plua plav thiab lub teeb thiab yog li tsim nyog rau kev kuaj pom cov khoom pob tshab lossis cov khoom cuam tshuam.
Sib nqus sib sib zog nqus keyboards (xws li Hall sensors) ua rau cov teeb liab raws li kev hloov pauv hauv qhov chaw sib nqus. Lawv tau tsim tshwj xeeb los tshawb xyuas cov khoom sib nqus lossis cov khoom siv nrog cov hlau nplaum thiab feem ntau yog siv rau hauv kev tswj hwm kev tswj hwm thiab kev siv tsheb.
Txhua hom kev sib txuas sib txuas muaj nws qhov zoo thiab qhov tsis zoo, thiab kev xaiv yuav tsum ua raws li cov khoom siv ntawm cov khoom tshawb nrhiav, ib puag ncig, thiab cov kev cai raug. Piv txwv li, inductive sensors yog nyiam rau kev tshawb nrhiav hlau, thaum capacitive sensors zoo dua rau kev kuaj kua. Kev nkag siab txog qhov sib txawv no tuaj yeem pab txhim kho kev ntseeg siab thiab kev ua haujlwm ntawm automation systems.
