Lub hauv paus ntsiab lus ntawm Kev Ua Haujlwm ntawm Optical Sensors Lub hauv paus Circuit Court ntawm ib qho khoom siv kho qhov muag tau pom hauv daim duab 2-2.1(a). Lub anode ntawm LED yog txuas nrog lub hwj chim kab VCC ntawm resistor RE thiab cov cathode yog grounded. Forward tam sim no IF yog ntws los ntawm LED thiab yog emitting infrared lub teeb uas tsis pom ntawm lub qhov muag. Tus sau ntawm ib daim duab transistor txuas nrog lub hwj chim kab VCC ntawm resistor RL thiab cov emitter yog grounded. Tsis tas li ntawd, lub collector yuav tsum tau txuas nrog lub input davhlau ya nyob twg ntawm tus piv los yog IC ntawm theem tom ntej. Lub teeb emitting thiab ntes cov cuab yeej raug teeb tsa raws li pom hauv daim duab 2-2.1(b). Thaum lub teeb cutoff phaj, uas yog, lub hom phiaj yuav tsum tau kuaj los ntawm lub emitter thiab ntes cov duab transistor tig tawm thiab lub peev xwm ntawm lub collector nce. Ntawm qhov tod tes, thaum nws raug tshem tawm lub transistor tig rau thiab cov khoom tuaj yeem poob. Hauv lwm lo lus, kev muaj nyob ntawm ib yam khoom raug kuaj pom thiab hloov mus rau hauv lub teeb liab hluav taws xob yam tsis tau hu rau nws. Nquag, cov teeb liab no yog cov tswv yim rau kev ua tiav cov teeb liab ua tiav ntawm theem tom ntej los tswj ntau yam haujlwm peripheral.
Daim duab 2-2.1 - Lub hauv paus ntawm kev ua haujlwm ntawm optical sensor
Tsim cov txheej txheem rau Optical Sensor Circuits Ua ntej, tau txais qhov tseem ceeb ntawm RE thiab RL. Nyob rau hauv daim duab 2-2.1(a), thaum lub pem hauv ntej voltage poob ntawm ib tug LED yog VF, tam sim no IF ntws mus rau lub LED yog muab los ntawm: (1) IF=(VCC-VF) / RE thiab yuav tsum txaus siab (2 ) IF=IF (MAX) (Ta=TOPR (MAX)) Los ntawm (1) thiab (2), RE yog muab los ntawm cov qauv hauv qab no: (3) IF=(VCC-VF) / IF (MAX) Raws li tuaj yeem ua tau. pom nyob rau hauv daim duab 2-2.2, qhov loj dua IF yog, qhov ntau optical tso zis IE yuav raug tsim thiab yog li ntawd, nws yog tsim nyog los xam IF (MIN) los ntawm kev noj qhov hloov pauv ntawm kev tso cai poob ntawm IF thiab IE rau hauv kev txiav txim siab tom qab txiav txim siab RE. Tus nqi tsim nyog ntawm RL: Tau txais qhov txwv siab tshaj tus nqi ntawm RL Hauv daim duab 2-2.1(b), thaum lub teeb hluav taws xob txiav tawm sab hauv, daim duab hluav taws xob tam sim no IL tsim los ntawm lub teeb emissions los ntawm LED tsis ntws mus rau cov duab transistor tab sis cov duab xau tam sim no IL' thiab tsaus nti tam sim no, Id, tsuas yog ntws. Muaj peev xwm ntawm tus neeg sau VOH lub sijhawm no yog: VOH=VCC – RL x (Id +IL') Txawm li cas los xij, nws tau xav tias qhov kev tawm tswv yim / tso tawm tam sim no rau / los ntawm theem tom ntej tuaj yeem tsis lees paub.
Daim duab 2-2.2
Txij li thaum Id nce sai nrog ambient kub nce raws li qhia hauv daim duab 2-1.5, piv txwv li cov theem siab input voltage ntawm theem tom ntej yog VIH, nws yog ib qho tsim nyog yuav tsum tau ua raws li cov hauv qab no: VIH< voh="" ntawm="" ta="Topr" (max)="" rl="(VCC" –="" vih)="" (id="" +="" il="" tom="" qab="" ntawd,="" tau="" txais="" tus="" nqi="" qis="" dua="" ntawm="" rl.="" thaum="" lub="" teeb="" hlais="" phaj="" tsis="" nyob="" hauv,="" lub="" teeb="" tau="" txais="" los="" ntawm="" daim="" duab="" transistor="" thiab="" lub="" teeb="" tam="" sim="" no="" il="" thiab="" cov="" hais="" saum="" toj="" no="" id="" +="" il'="" ntws="" mus="" rau="" cov="" duab="" transistor.nquag,="" tshwj="" tsis="" yog:="" il="Id" +="" il'="" nws="" nyuaj="" rau="" kev="" ntxub="" ntxaug="" hav="" zoov="" ntawm="" lub="" teeb="" txiav="" tawm="" ntawm="" qhov="" pom.="" ntawm="" s/n="" piv,="" tus="" collector="" muaj="" peev="" xwm="" vol="" nyob="" rau="" lub="" sij="" hawm="" no="" yog="" (4)="" vol="VCC" –="" rl="" (il="" +="" id="" +="" il')="" piv="" txwv="" tias="" cov="" theem="" qis="" input="" voltage="" mus="" rau="" theem="" tom="" ntej="" yog="" vil'="" nws="" yog="" ib="" qho="" tsim="" nyog="" kom="" txaus="" siab="" (5)="" vil=""> VOL Formulas (4) thiab (5) yuav tsum txaus siab txawm tias tus nqi qis tshaj ntawm IL. Qhov qis tshaj tus nqi IL (MIN) yog: IL (MIN )=CTR (MIN) x Dt x DTa x Dn
Daim duab 2-1.5
Dt: CTR degradation factor thaum lub sijhawm ua haujlwm (Fig. 2-1.7) DTa: CTR kub variation (Fig. 2-1.6) Dn: CTR variation ntawm hmoov av thiab av Los ntawm cov qauv (4) thiab (5), RL=(VCC – VIL ) / (IL(MIN) + Id + IL') Lub RL me dua, lub sijhawm hloov pauv yuav luv dua. YUAV UA LI CAS YUAV UA LI CAS YUAV UA LI CAS YUAV TSUM TAU TXAIS KEV TXAUS SIAB THIAB RECEIVING Devices Hauv cov hauv qab no, coupling yam ntxwv ntawm lub teeb emitting thiab ntes cov cuab yeej raug xam raws li qhov pib tsim los saib seb lawv puas siv tau. Tom qab ntawd, raws li cov kauj ruam thib ob ib txoj hauv kev los xyuas cov haujlwm tiag tiag, thiab lwm yam tau nthuav tawm. Initial Design Coupling yam ntxwv ntawm cov khoom sawv cev yog pom nyob rau hauv cov duab 2-4.1 ~ 2-4.3. Cov yam ntxwv zoo li no yog qhov txawv me ntsis raws li kev sib xyaw ntawm lub teeb emitting thiab ntes cov cuab yeej. Feem ntau, thaum d> 1 cm lossis ntau dua hauv cov qauv hauv qab no suav nrog, cov yam ntxwv no tuaj yeem tau txais roughly yam tsis tau tshawb xyuas lawv tus kheej.
(sab laug) Daim duab 2-4.1 - Coupling yam ntxwv ntawm TLN108 thiab TPS601A (txoj cai) Daim duab 2-4.2 - Coupling yam ntxwv ntawm TLN105B thiab TPS703
Daim duab 2-4.3 - Coupling yam ntxwv ntawm TLN107A thiab TPS608A
Ua ntej, nyeem radiant siv IE (MIN) ntawm lub teeb emitting ntaus ntawv thiab lub teeb tam sim no IL (MIN) ntawm lub teeb pom kev zoo raws li tej yam kev mob qhia nyob rau hauv daim ntawv teev cov ntaub ntawv. Raws li radiant siv IE (mW / sr) yog sib npaug rau radiant tshwm sim EO (mW / cm2) radiated ntawm ib cheeb tsam 1 cm2 ntawm qhov deb 1 cm, tau txais radiant teeb meem E (tiag tiag) ntawm ib tug deb d cm yog tau los ntawm cov nram qab no mis: E (Qhov Tseeb) ~ IE / d2 (mW / cm2) Piv txwv tias qhov tshwm sim radiant ntawm lub teeb pom kev ntawm lub teeb pom kev rhiab heev yog E lub teeb tam sim no IL (qhov tseeb) hauv lub xeev ua ke tau txais raws li hauv qab no: IL (qhov tseeb)=IL x (E (qhov tseeb) / E) Thaum lub teeb tau txais tam sim no me me heev thiab nws nyuaj rau tsim cov theem tom ntej Circuit Court, nce DC rau pem hauv ntej tam sim no IF ntawm lub teeb emitting ntaus ntawv lossis nce radiant siv IE (mW / sr ) los ntawm pulse forward tam sim no. Ua piv txwv ua ib qho kev ntsuam xyuas raws li hauv qab no: Emitter: IE(MIN)=1 mW / sr ntawm IF=20 mA Detector: IL(MIN)=20 μA ntawm E=0.1 mW / cm2, VCE=3V nrug ntawm Emitter thiab Detector: d=1.5 cm E (qhov tseeb) (MIN)=IE / d2=1 x (1/1.52)=0.44 mW / cm2 (MIN) IL (actual) (MIN) ~ (E (tuaj yeem) / E) x IL (MIN)=(0.44 / 0.1) x 20 μA=88 μA Raws li IL (qhov tseeb) (MIN) yog 88 μA, nws tsis tuaj yeem tsav TTL ncaj qha, tab sis C-MOS IC tuaj yeem txuas tau. Tom qab ntawd, thaum lub sij hawm thauj khoom ntawm lub teeb tau txais cov cuab yeej txiav txim siab raws li cov khoom siv hluav taws xob, nws qhov kev hloov pauv ceev yog nyob ntawm tus nqi thauj khoom thiab nws yuav tsum tau kuaj xyuas ua ntej. Daim ntawv thov Circuits ntawm Diam duab Sensors Daim ntawv thov Circuits ntawm Infrared LEDs Txij li thaum lub zog tso zis Po, ntawm ib qho khoom siv infrared nyob ntawm LED rau pem hauv ntej tam sim no, IF, On-Off txheej xwm ntawm cov zis tuaj yeem hais los ntawm kev tswj cov khoom tam sim no. Cov txheej txheem teeb pom kev zoo xws li DC teeb pom kev zoo, thiab lwm yam thiab kev ceev faj rau kev tsim tau piav qhia ntawm no. Qhia hauv daim duab 3-1.1 yog lub hauv paus Circuit Court rau teeb pom kev zoo thaum siv DC fais fab. IF nyob rau hauv cov ntaub ntawv no yog qhia los ntawm cov mis mos hauv qab no: IF=(VCC – VF) / R VCC: Supply voltage VF: Forward voltage ntawm LED IF: Forward tam sim no ntws mus rau LED PHO teeb pom kev zoo Circuit Court DC
(Sab laug mus rau sab xis) Daim duab 3-1.1 - DC Drive unit Daim duab 3-1.2 - Tsis tu ncua tsav tam sim no circuit Daim duab 3-1.3 - Ntau LED tsav Circuit Court
Qhia nyob rau hauv daim duab 3-1.2 yog ib lub voj voog uas npog cov variations ntawm VF ntawm ib qho LED nrog Transistor. Yog hais tias nyob rau hauv lub Circuit Court no yog qhia los ntawm cov mis nyuj hauv qab no: IF=(VB – VBE) / R3 VB : Base voltage VBE : Base rau emitter voltage R3 : Emitter kuj Tsis tas li ntawd, nws muaj peev xwm txo qhov kub ntawm qhov tso zis los ntawm kev teeb tsa kom raug. VBE thiab VB hauv Circuit Court no. Thaum cov zis hluav taws xob tsis txaus lossis lub teeb tau txais lub teeb nyob deb dhau lawm, nws tuaj yeem ua kom tiav Circuit Court los ntawm kev sib txuas los yog sib txuas raws li qhia hauv daim duab 3-1.3. Nyob rau hauv cov ntaub ntawv no, IF=(VCC – nVF) / R (series kev twb kev txuas) IF=(VCC – VF) / R (parallel kev twb kev txuas) AC Tsav Qhia nyob rau hauv daim duab 3-1.4 yog lub hauv paus circuits rau ze li ntawm ib nrab-yoj AC teeb pom kev zoo. . Feem ntau, muaj ob txoj kev tsav tsheb. Ob leeg siv lub diode tiv thaiv los tiv thaiv LED ntawm qhov hluav taws xob rov qab. Hauv (a), qhov kev tiv thaiv diode no yog hom hluav taws xob rov qab sib txuas rau cov khoom siv hluav taws xob VCC, thiab hauv (b), qhov hluav taws xob rov qab ntawm cov hluav taws xob tiv thaiv yuav tsum yog kwv yees li ob npaug ntawm qhov hluav taws xob tom ntej ntawm ib qho infrared LED.
Nyob rau hauv lub Circuit Court saum toj no, ib qho tas li R uas haum rau qhov ntsuas hluav taws xob yog siv raws li cov khoom siv hluav taws xob VCC. Tsis tas li ntawd, R raug xaiv kom nws raug txwv rau tus nqi ntsuas ntawm qhov tam sim no IF ntawm ib qho infrared LED ntawm ib qho chaw uas cov khoom siv hluav taws xob, VCC, ua siab tshaj.
Daim duab 3-1.4 - AC tsav Circuit Court
Kev Tsav Tsheb Pulse Ntau qhov zoo tau txais thaum lub teeb liab kho qhov muag hloov mus rau lub teeb mem tes modulated. Cov nram qab no yog xam: Thaum lub luag hauj lwm piv ntawm ib tug mem tes modulated teeb liab yog me me, lub instantaneous lub teeb tso zis ntawm lub teeb emitting ntaus ntawv nce, lub optical teeb liab yog cais los ntawm ambient teeb thiab S / N ratio yog guaranteed. Thaum lub roj teeb siv los ua lub zog siv hluav taws xob, kev siv hluav taws xob ntawm lub cuab yeej tuaj yeem txo qis thiab yog li ntawd, roj teeb kev pab cuam lub neej txuas ntxiv mus. RC coupling nrog rau theem tom ntej nyob rau hauv qhov chaw txais lub teeb yuav ua tau thiab cov teebmeem ntawm qhov tsaus ntuj tam sim no nce los ntawm qhov kub thiab txias tuaj yeem zam tau. Qhov kev tsav tsheb mem tes no yog tsim los ua ke nrog TTL lossis C-MOS thiab Tr, thiab lwm yam hauv Circuit Court uas qhia hauv daim duab 3-1.5, nws yuav tsum tau them sai sai rau cov yam ntxwv hluav taws xob ntawm IOL ntawm TTL lossis C-MOS ntaus ntawv. txij li cov dej ntws loj heev tsis tuaj yeem siv los ua kom txaus siab IF< iol.="" txhawm="" rau="" siv="" qhov="" tam="" sim="" no="" siab="" dua,="" nws="" yuav="" tsum="" siv="" lub="" tshuab="" tsis="" siv="" ic="" nrog="" lub="" peev="" xwm="" tso="" zis="" siab="" tam="" sim="" no="" raws="" li="" qhia="" hauv="" daim="" duab="" 3-1.6="" lossis="" txhawm="" rau="" nruab="" ib="" lub="" transistor="" sab="" nraud.="" iol="" thiab="" vol="" yam="" ntxwv="" ntawm="" ttl,="" c-mos="" thiab="" tsis="" ic="" yog="" qhia="" rau="">
Daim duab 3-1.5
Daim ntawv thov Circuits ntawm Diam duab Transistors Basic Circuit Ib qho yooj yim Circuit Court rau ib Diam duab transistor yog qhia nyob rau hauv daim duab 3-2.1 Load resistance RL yog xaiv los ntawm kev noj qhov tsaus ntuj tam sim no kub yam ntxwv ntawm lub photo transistor rau hauv kev txiav txim. Yog tias RL loj dhau lawm, daim duab transistor tuaj yeem qhib tsuas yog los ntawm qhov tsaus ntuj tam sim no ntawm qhov kub siab. Piv txwv li, thaum Photo Transistor TPS601A ua haujlwm ntawm Ta=100 ° C, tam sim no tsaus nti yuav dhau los txog 100 μA. Thaum RL tau teeb tsa ntawm 50 kW ntawm VCC=5V, TPS601A tag nrho tig mus rau ON lub xeev los ntawm kev nce hauv qhov tsaus ntuj tam sim no.
Daim duab 3-2.1 – Basic circuit of photo transistor
Bias Circuit Court ntawm Diam duab Transistor nrog Base Terminal Cov teebmeem ntawm lub hauv paus rau emitter resistor RBE ntawm qhov tsaus ntuj tam sim no nrog rau lub teeb tam sim no tau qhia hauv daim duab 3-2.2 (a) thiab (b). Nquag, qhov tsaus ntuj tam sim no ntawm cov duab transistor yog me me li ob peb nA ntawm qhov kub thiab txias thiab nws tuaj yeem txo qhov tam sim no tsaus nti ntxiv los ntawm kev ntxig lub resistor RBE ntawm lub hauv paus thiab emitter kom dhau los ntawm cov xau tam sim no los ntawm cov khoom siv mus rau qhov chaw sib tshuam. Yog tias RBE raug tsim ntau dhau me me, qhov pom tseeb hFE ntawm cov duab transistor raug txo qis thiab qhov xav tau lub teeb tam sim no IL tsis tuaj yeem tau, yog li, RBE ntawm ntau dua 1 MW yog qhov tsim nyog.
Daim duab 3-2.2 (a) - Txo qhov tsaus nti tam sim no los ntawm RBE / Daim duab 3-2.2 (b) - Hloov lub teeb tam sim no los ntawm RBE
Tsis tas li ntawd, nws muaj peev xwm teeb tsa qhov chaw ua haujlwm ntawm cov duab transistor nyob rau theem tsim nyog los ntawm kev siv lub hauv paus davhlau ya nyob twg. Linearity ntawm illumination-lub teeb tam sim no cov yam ntxwv nyob rau hauv cov ntaub ntawv no tau txhim kho considerably thaum piv nrog rau cov ntaub ntawv uas lub hauv paus bias tam sim no yog xoom. Tsis tas li ntawd, muaj ib txoj kev bleeder hom bias qhia nyob rau hauv daim duab 3-2.4, uas txhim kho thermal stability ntawm DC kev khiav hauj lwm taw tes xyaum, 2 ~ 10 MW yog xam tias tsim nyog rau tus nqi ntawm RB. Qhov no yog siv yuav luag tag nrho lub teeb tam sim no IL ntawm lub photodiode ntawm cov khoom siv thiab cov ntsiab lus sib txuas rau lub hauv paus ntawm daim duab transistor los ntawm kev txhawb nqa impedance ntawm lub hauv paus.
Daim duab 3-2.4 (b) – Bleeder type bias method
Temperature Compensating Circuit Lub teeb tam sim no IL thiab tsaus nti tam sim no ID ntawm daim duab transistor muaj qhov zoo kub coefficient. Tshwj xeeb, tam sim no tsaus nti nce exponentially raws li qhia nyob rau hauv cov ntaub ntawv qhia txog tus kheej. Yog li ntawd, kom tau txais kev ua haujlwm ruaj khov ntawm ambient kub ntawm 50 ~ 60 ° C, kub them rau qhov tsaus ntuj tam sim no thiab cov duab hluav taws xob tam sim no ntawm daim duab transistor yuav tsim nyog. Lub voj voog qhia hauv daim duab 3-2.5, siv qhov tsis zoo kub coefficient khaws cia los ntawm lub zog pem hauv ntej VF ntawm lub diode. Thaum siv cov duab transistor uas tsis muaj lub hauv paus davhlau ya nyob twg, ib txoj hauv kev los them nyiaj rau qhov tso zis hluav taws xob yuav txo tau qhov kev tiv thaiv ntawm cov duab transistor los ntawm kev siv lub thermistor raws li qhia hauv daim duab 3-2.6.
Daim duab 3-2.5 - Kub them nyiaj hluav taws xob siv hluav taws xob diode
Daim duab 3-2.6 - Kub them nyiaj Circuit Court siv thermister
Basic Amplifier Circuit Qhia hauv daim duab 3-2.7 (a) yog kev sib txuas ntawm Darlington siv NPN transistor thiab daim duab 3-2.7 (b) yog Darlington kev sib txuas siv PNP transistor. Hauv ob lub voj voog, lub teeb tam sim no tau nce los ntawm hFE lub sij hawm thiab cov zis tam sim no IC dhau los ua hFE. IL
Daim duab 3-2.7 - Amplifier circuit rau photo transistor
Fig. 3-2.8 qhia cov piv txwv ntawm cov kab hluav taws xob yooj yim uas siv lub suab nrov los ntawm kev ua haujlwm amplifier.
Daim duab 3-2.8 - Amplifier Circuit Court nrog ua haujlwm thermal
Kev txhim kho ntawm Switching Speed Thaum voltage amplification yog nce los ntawm kev nce load impedance raws li lub teeb tam sim no ntawm ib tug yees duab transistor me me, hloov ceev tus yam ntxwv tej zaum yuav txi raws li ib tug rov qab nyhuv. Raws li kev kho mob, muaj cov txheej txheem kom tau txais cov yam ntxwv hloov ceev uas muaj kev ywj pheej ntawm qhov loj ntawm qhov thauj khoom los ntawm kev hloov pauv impedance los ntawm PNP transistor raws circuits (Fig. 3-2.9 (a)) lossis cascade kev twb kev txuas ntawm NPN transistor (Fig 3- 2.9 (b)). Cov kev sim no muaj feem xyuam rau lub siab ceev pulse modulated lub teeb pom kev Circuit Court rau daim duab hluav taws xob hloov / siab ceev daim kab xev nyeem.
Daim duab 3-2.9 – Piv txwv ntawm kev txhim kho tus cwj pwm zaus
Analog Siv Diam duab transistors muab rhiab heev dua li yees duab diodes raws li lawv tau nruab nrog ib tug amplification muaj nuj nqi nyob rau hauv; Txawm li cas los xij, qhov rhiab heev fluctuates nyob ntawm qhov sib txawv ntawm amplification yam. Yog li ntawd, nws yog ib qho tsim nyog los siv ib qho kev sib txawv ntawm cov resistor los kho qhov rhiab heev los yog yuav ib yam khoom uas tau xaiv ua ntej rau qhov kev ntsuas tshwj xeeb.
Daim duab 3-2.14
Qhia nyob rau hauv daim duab 3-2.14 (a) yog lub Circuit Court tswj cov tam sim no ntawm transistor amplifier. Lub collector tam sim no ntawm ib daim duab transistor tswj lub hauv paus ntawm theem tom ntej transistor uas emitter yog grounded. Kev hloov pauv hauv cov duab transistor qhov rhiab heev yog tswj los ntawm kev tawm tswv yim resistor RE nyob rau hauv lub emitter circuit. Qhia nyob rau hauv daim duab 3-2.14 (b) yog ib tug Circuit Court tswj qhov voltage ntawm lub transistor amplifier. Lub collector tam sim no ntawm ib daim duab transistor generates ib qhov hluav taws xob rau kev tswj ib theem tom ntej transistor los ntawm ib tug sib txawv resistor. Tus transistor yog tus ua raws thiab qhov hloov pauv ntawm tus kheej cov duab transistors raug kho los ntawm qhov sib txawv ntawm cov resistor RA. Yog li ntawd, photo transistor lub sijhawm hloov pauv hloov los ntawm RA. Daim ntawv thov Circuits ntawm Diodes Diodes Ua ke nrog infrared LEDs, yees duab diodes yog siv nyob rau hauv ob txoj kev; digitally txhawm rau txheeb xyuas qhov muaj nyob ntawm lub teeb thiab analog kom pom qhov ntau ntawm lub teeb. Kev Siv Digital Raws li cov lus teb ceev ceev, cov duab diodes tsim nyog rau kev hloov pauv ceev. Ntawm qhov tod tes, txawm li cas los xij, txij li lub teeb tam sim no me me, nws yog ib qho tsim nyog yuav tsum siv lub FET nrog lub siab input impedance raws li qhia hauv daim duab 3-3.1 (a) lossis ib lub voj voog uas muaj lub zog loj raws li qhia hauv daim duab 3-3.1 ( b). Txhawm rau txhim kho kev ua haujlwm, ib qho kev ua haujlwm amplifier yog siv. Thaum cov lus teb ceev ceev yog xav tau, nws yuav tsum xaiv lub amplifier rau cov ntawv thov kev kub ceev uas tsim nyog.
Daim duab 3-3.1 - Amplifier Circuit Court ntawm phoro diode (kev siv digital)
Analog Usage Illuminance thiab yees duab hluav taws xob tam sim no cov yam ntxwv ntawm cov duab diodes yog ze rau linear tshaj li cov duab transistors thiab yees duab diodes tuaj yeem hais tias yog ib yam khoom uas yooj yim siv hauv kev siv analog. Rau hom kev siv no, muaj linear amplification thiab logarithmic amplification.
Daim duab 3-3.2 - Amplifier circuits ntawm Diode Diode (kev siv analog)
Daim ntawv thov Circuits Ntawm Reflective Hom Yees Duab Sensors Lub ntsej muag hom duab sensor muaj nyob rau hauv ob hom; hom tsom xam thiab hom tsis-focus. Hom tsim nyog yuav tsum raug xaiv raws li daim ntawv thov. Raws li tuaj yeem pom los ntawm kev txheeb xyuas qhov tseem ceeb ntawm txoj hauj lwm yam ntxwv qhia hauv Fig. 3-5.1 thiab 3-5.2, dub thiab dawb ciam teb nto qhov chaw kuaj pom tus yam ntxwv ntawm hom tsom xam yog sharper dua li ntawm hom tsis-focus. Yog li ntawd, hom tsom xam yog superior rau hom tsis-focus rau bar code nrhiav kom tau daim ntaub ntawv. Txawm li cas los xij, hom me me uas tsis muaj kev tsom xam muaj txiaj ntsig zoo rau kev tshawb nrhiav cov khoom.
Daim duab 3-5.1 - Piv txwv ntawm cov yam ntxwv tsis pom kev nrhiav pom txoj haujlwm
Daim duab 3-5 – Reflection type photo sensor basic detection circuit
Txij li thaum nws yog ib qho tsim nyog rau hom kev xav ntawm cov duab sensor kom digitally tso tawm qhov muaj nyob ntawm cov khoom kuaj pom, ib qho kev sib piv Circuit Court txuas rau ntawm cov zis tom ntej ntawm qhov kev xav ntawm hom duab sensor raws li qhia hauv daim duab 3.5-4.
Daim duab 3-5.4 Kev sib txuas hauv Circuit Court ntawm kev xav txog hom duab sensor nrog kev sib piv
Daim ntawv thov tsim ntawm qhov kev xav ntawm hom duab sensor yog qhov nyuaj dua li kev sib kis hom duab sensor vim:
Reflection yam ntawm kev xav ntawm cov khoom sib txawv ntawm ib leeg
Qhov deb ntawm kev cuam tshuam cov khoom yog tswj tau yooj yim
Ob lub teeb emitting thiab kuaj pom qhov chaw yog nyob rau tib lub dav hlau thiab raug cuam tshuam los ntawm cov teeb pom kev sab nraud, thiab cov xau tam sim no nce.
Yog li ntawd, tej zaum nws yuav hais tias nws yog qhov zoo dua los tsim kev sib kis hom duab sensor yog tias ua tau.
