PIN Diode Raws Li Hluav Taws Xob Sensor: 4 Cov Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:26

Nov yog tus lej PIN diode raws li lub ntsuas hluav taws xob uas qhib lub tswb thaum nws pom hluav taws. Thermistor raws hluav taws tswb muaj qhov tsis zoo; lub tswb qhib tsuas yog tias qhov hluav taws kub rhaub lub thermistor nyob ze ze. Hauv kab lus no, tus lej PIN tus lej nkag siab tau siv ua lub ntsuas hluav taws kom pom qhov hluav taws kub ntev dua.

Nws pom lub teeb pom kev zoo thiab infrared (IR) hauv thaj tsam ntawm 430nm - 1100nm. Yog li pom lub teeb thiab IR los ntawm qhov hluav taws tuaj yeem qhib lub sensor kom ua rau lub tswb nrov. Nws kuj tseem pom cov teeb pom kev hauv cov xov hluav taws xob thiab, yog tias cov no txuas ntxiv, nws muab lub tswb ceeb toom. Nws yog cov cuab yeej tiv thaiv zoo tshaj plaws rau chav tso khoom, tub rau khoom, kaw chav thiab lwm yam.

Kauj Ruam 1: Daim Ntawv Teev Npe

Semiconductors:

_ IC1 (CA3140 op-amp);

_ IC2 (CD4060 txee);

_T1, T2 (BC547 npn transistor);

_ LED1, LED2, LED3, (5mm Coj);

_ D1 (BPW34 PIN photodiode)

Resistors (txhua 1/4 watt, ± 5% carbon):

_ R1, R5, R6 (1 mega-ohm);

_R2, R3 (1 kilo-ohm);

R4, R7, R8 (100 ohm)

Capacitors:

_ C1 (0, 22 μF ceramic disk)

Lwm yam:

_ BATT.1 (9, 0V roj teeb);

_ PZ1 (piezo buzzer)

Yog li, tus lej PIN diode BPW34 tau siv hauv Circuit Court ua lub teeb thiab IR sensor. BPW34 yog 2-pin photodiode nrog anode (A) thiab cathode (K). Qhov kawg anode tuaj yeem txheeb xyuas tau yooj yim los ntawm sab saum toj-saib tiaj tus ntawm photodiode. Ib qho taw tes me me uas txuas nrog cov xaim xaim txuas yog anode thiab lwm qhov yog cathode davhlau ya nyob twg.

BPW34 yog tus PIN me me photodiode lossis lub hnub ci me me uas muaj lub ntsej muag ci ntsa iab uas ua rau 350mV DC qhib hluav taws xob hluav taws xob thaum raug rau 900nm lub teeb. Nws yog rhiab rau ntuj tshav ntuj thiab tseem pom los ntawm hluav taws. Yog li nws yog qhov zoo tshaj plaws rau kev siv ua lub teeb pom kev zoo. PPW34 photodiode tuaj yeem siv rau hauv xoom-kev tsis txaus siab nrog rau kev rov qab tsis ncaj ncees. Nws tsis kam txo qis thaum lub teeb ntog rau nws.

Kauj Ruam 2: Daim duab Circuit Court

Daim duab qhia chaw ntawm tus PIN diode raws li lub ntsuas hluav taws xob tau qhia hauv daim duab 3. Nws tau tsim nyob ib puag ncig 9V roj teeb, PIN diode BPW34 (D1), op-amp CA3140 (IC1), txee CD4060 (IC2), transistors BC547 (T1 thiab T2)), piezo buzzer (PZ1) thiab ob peb yam ntxiv.

Hauv Circuit Court, tus lej PIN photodiode BPW34 txuas nrog kev hloov pauv thiab tsis hloov pauv ntawm op-amp IC1 hauv qhov rov qab-tsis ncaj ncees rau hom kom pub yees duab tam sim no rau hauv kev nkag ntawm op-amp. CA3140 yog 4.5MHz BiMOs op-amp nrog MOSFET inputs thiab bipolar output. Gate-tiv thaiv MOSFET (PMOS) transistors hauv cov kab hluav taws xob muab cov tswv yim siab heev, feem ntau nyob ib ncig ntawm 1.5T ohms. IC xav tau cov tswv yim tam sim no qis heev, qis li 10pA, txhawm rau hloov pauv cov xwm txheej kom siab lossis qis. Hauv Circuit Court, IC1 yog siv los ua transimpedance amplifier los ua tam sim no-rau-voltage hloov pauv. IC1 ua kom nrov nrov thiab hloov cov duab tam sim no tsim tawm hauv tus PIN diode rau qhov sib xws qhov hluav taws xob hauv nws cov zis. Cov tswv yim tsis hloov pauv tau txuas nrog hauv av thiab anode ntawm photodiode, thaum cov ntaub ntawv hloov pauv tau txais cov duab tam sim no los ntawm tus lej PIN.

Kauj Ruam 3: Kev Ua Haujlwm Hauv Circuit

Loj-tus nqi tawm tswv yim resistor R1 teeb tsa qhov nce ntawm transimpedance amplifier vim nws tau hloov pauv kev teeb tsa. Kev sib txuas ntawm qhov tsis hloov pauv tswv yim rau hauv av muab qhov qis impedance load rau photodiode, uas ua rau photodiode voltage tsawg.

Lub photodiode ua haujlwm nyob rau hauv hom photovoltaic uas tsis muaj kev cuam tshuam sab nraud. Kev tawm tswv yim ntawm op-amp khaws cov photodiode tam sim no sib npaug rau cov lus tawm tswv yim tam sim no los ntawm R1. Yog li cov tswv yim tawm qhov hluav taws xob vim lub photodiode tsawg heev hauv qhov kev xav ntawm tus kheej photovoltaic. Qhov no tso cai kom tau txais txiaj ntsig loj yam tsis muaj qhov tso tawm qhov hluav taws xob loj. Qhov kev teeb tsa no tau xaiv kom tau txais txiaj ntsig loj hauv qhov xwm txheej qis. Feem ntau, nyob rau ib puag ncig teeb pom kev zoo, photocurrent los ntawm tus lej diode tsawg heev; nws khaws cov zis ntawm IC1 qis. Thaum tus lej PIN pom pom lub teeb lossis IR los ntawm hluav taws, nws cov duab tam sim no nce ntxiv thiab hloov pauv qhov hloov pauv IC1 hloov qhov tam sim no mus rau qhov tso hluav taws xob sib xws. Cov zis siab los ntawm IC1 ua rau transistor T1 thiab LED1 ci. Qhov no qhia tau tias lub Circuit Court tau pom hluav taws. Thaum T1 ua, nws yuav rov pib dua tus pin 12 ntawm IC2 rau hauv av muaj peev xwm thiab CD4060 pib oscillating.

IC2 yog lub rooj sib tham binary nrog kaum qhov tso tawm uas tig siab ib ntawm ib qho thaum nws oscillates vim C1 thiab R6. Oscillation ntawm IC2 yog qhia los ntawm qhov ntsais ntawm LED2. Thaum cov zis Q6 (tus pin 4) ntawm IC2 tig siab tom qab 15 vib nas this, T2 ua thiab qhib lub piezo buzzer PZ1, thiab LED3 kuj ci. Lub tswb rov ua dua tom qab 15 vib nas this yog tias hluav taws tseem nyob. Koj tseem tuaj yeem qhib lub tswb AC uas ua rau lub suab nrov nrov los ntawm kev hloov PZ1 nrog kev xa xov hluav taws xob (tsis pom ntawm no). Lub tswb AC tau qhib los ntawm kev sib cuag ntawm cov xa tawm siv rau lub hom phiaj no.

Kauj Ruam 4: Kev Tsim Kho thiab Kev Xeem

Ib sab PCB rau tus PIN diode raws li lub ntsuas hluav taws xob tau qhia hauv daim duab 4 thiab nws cov txheej txheem teeb tsa hauv daim duab 5. Muab cov PCB tso rau hauv lub thawv me me hauv txoj hauv kev uas koj tuaj yeem txuas tus lej diode BPW34 tau yooj yim ntawm sab nraub qaum lub thawv Nruab tus PIN diode hauv qhov chaw tsim nyog thiab npog nws zoo li lub teeb/tshav ntuj ib txwm tsis poob rau nws.

Kuaj lub Circuit Court yog ib qho yooj yim. Feem ntau, thaum tsis muaj hluav taws nplaim taws nyob ze tus PIN diode, lub piezo buzzer tsis nrov. Thaum cov nplaim hluav taws tau hnov los ntawm tus lej PIN, piezo buzzer suab nrov nrov. Nws qhov ntsuas pom yog nyob ib puag ncig ob meters. Nws tseem tuaj yeem tshawb pom cov teeb meem hauv cov kab hluav taws xob vim yog luv-Circuit.