Cov qauv thiab muaj pes tsawg leeg ntawm Infrared Photoelectric Range Finder
Lub infrared rangefinder feem ntau yog tsim los ntawm kev hloov pauv lub teeb pom kev zoo, chav txais txais, chav ntsuas theem, chav suav thiab tso saib, chav ntsuas kev tswj hwm thiab lub zog hloov pauv. Lub teeb ci feem ntau yog gallium arsenide (GaAs) semiconductor lub teeb emitting diode. Thaum lub sijhawm tam sim no dhau los ntawm PN kev sib tshuam ntawm GaAs diode, PN kev sib tshuam yuav tawm ze-infrared lub teeb nrog lub wavelength ntawm 0.72 μm thiab 0.94 μm, uas yog vim qhov electron-qhov recombination nyob rau hauv doped GaAs semiconductor. , lub zog tshaj yog tso tawm nyob rau hauv daim ntawv ntawm photons. Ntxiv mus, lub emission siv lub teeb yuav sib txawv nrog cov tshuaj tam sim no. Yog li ntawd, yog tias nws yog siv los ua lub teeb pom kev ntawm qhov rangefinder, lub amplitude modulation ntawm lub teeb emitted siv tau ncaj qha los ntawm kev hloov qhov loj ntawm cov khoom noj tam sim no, uas yog, cov khoom siv hluav taws xob semiconductor no muaj ob txoj haujlwm ntawm " radiation" thiab "modulation".
Lub infrared photodetection hloov dua siab tshiab ntaus ntawv siv tau txais modulated lub teeb feem ntau yog silicon photodiode los yog avalanche photodiode, thiab cov khoom siv no muaj "photovoltage effect". Thaum lub teeb sab nraud yog irradiated ntawm nws PN hlws ris, vim yog cov nyhuv ntawm photoelectric zog hloov dua siab tshiab, muaj peev xwm sib txawv tuaj yeem tsim tawm ntawm ob tug ncej ntawm PN, thiab nws qhov loj yuav hloov nrog qhov siv ntawm qhov teeb meem teeb meem, yog li ua lub luag haujlwm ntawm " demodulation".
