Video: Lub phototransistor puas tuaj yeem tau txais lub teeb los ntawm LED?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Qhov rhiab heev ntawm feem ntau LEDs ruaj khov heev dhau lub sijhawm. Yog li yog silicon photodiodes - tab sis cov ntxaij lim dej muaj tsawg lub neej. LEDs tau ob leeg emit thiab ntes teeb . Qhov no txhais tau hais tias kev sib txuas cov ntaub ntawv kho qhov muag ua tau tsim los nrog ib leeg xwb LED ntawm txhua qhov kawg, txij li cais kis thiab txais LEDs tsis xav tau.
Hais txog qhov no, LED puas tuaj yeem siv los ua photodiode?
Ntxiv nrog rau emitting lub teeb, ib LED tuaj yeem ua siv raws li photodiode teeb sensor / ntes. Raws li ib tug photodiode , ib LED yog rhiab heev rau wavelengths sib npaug los yog luv dua lub predominant wavelength nws emits. Ib ntsuab LED yuav rhiab rau lub teeb xiav thiab rau qee lub teeb ntsuab, tab sis tsis yog lub teeb daj lossis liab.
Tsis tas li ntawd, qhov voltage yog phototransistor sensor? Feem ntau tus nqi resistor ntawm 5kΩ lossis siab dua yog tsim nyog ua haujlwm tus phototransistor nyob rau hauv lub hloov hom. Cov zis theem siab hluav taws xob nyob rau hauv lub switching hom yuav tsum sib npaug zos cov khoom hluav taws xob . Cov zis theem qis hluav taws xob Nyob rau hauv lub switching hom yuav tsum tsawg tshaj li 0.8 Volts.
Kuj paub yog, dab tsi tuaj yeem ntes lub teeb?
Photodetectors, tseem hu ua photosensors, yog sensors ntawm teeb los yog lwm yam hluav taws xob electromagnetic. Cov duab ntes muaj p-n hlws ris uas hloov teeb photons nyob rau hauv tam sim no. Cov photons absorbed ua electron-qhov khub hauv cheeb tsam depletion. Photodiodes thiab photo transistors yog ob peb yam piv txwv ntawm cov duab ntes.
phototransistor ua dab tsi?
A phototransistor yog ib yam khoom uas hloov lub teeb lub zog rau hauv hluav taws xob. Phototransistors zoo ib yam li photoresistors tab sis tsim ob qho tib si tam sim no thiab voltage, thaum photoresistors tsuas yog tsim tam sim no.
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