Cov qauv thiab muaj pes tsawg leeg ntawm infrared photoelectric rangefinder
Infrared rangefinder feem ntau yog tsim los ntawm cov khoom siv hluav taws xob hluav taws xob hloov hluav taws xob, chav txais txais, chav ntsuas theem, suav cov zaub, chav ntsuas kev tswj hwm thiab lub zog hloov pauv thiab lwm qhov chaw. Nws lub teeb ci feem ntau yog arsenic qoob loo (GaAs) semiconductor lub teeb-emitting diodes. Thaum muaj ntau npaum li cas tam sim no rau pem hauv ntej los ntawm GaAs diode PN kev sib tshuam, PN kev sib tshuam yuav raug tso tawm nyob rau hauv lub wavelength ntawm 0.72 μm, 0.94 μm ntawm ze-infrared teeb, uas yog vim lub doped GaAs semiconductor nyob rau hauv lub electron-qhov sib xyaw, lub zog tshaj nyob rau hauv daim ntawv ntawm photons tso tawm thiab tsim. Thiab qhov kev siv ntawm lub teeb emission hloov nrog cov tshuaj tam sim no. Yog li ntawd, nws yuav raug siv los ua lub teeb pom kev sib txawv, koj tuaj yeem hloov qhov loj ntawm cov khoom noj tam sim no ntawm qhov kev siv ntawm lub teeb tawm ncaj qha mus rau lub amplitude modulation, uas yog, qhov no semiconductor lub teeb-emitting ntaus ntawv ob qho tib si "radiation" thiab "modulation. "dual function.
Siv tau txais modulated lub teeb infrared photoelectric nrhiav kom tau hloov dua siab tshiab ntaus ntawv feem ntau yog silicon photodiode los yog avalanche photodiode, cov khoom siv no muaj "photovoltaic effect". Thaum lub teeb sab nraud irradiation rau nws PN hlws ris, vim cov nyhuv ntawm photoelectric zog hloov dua siab tshiab nyob rau hauv lub PN ncej los tsim ib tug muaj peev xwm sib txawv, qhov loj ntawm qhov sib txawv nrog rau qhov siv ntawm lub teeb teeb meem.
Qhov loj ntawm qhov sib txawv yuav txawv nrog qhov siv ntawm qhov teeb meem teeb meem, yog li ua si lub luag haujlwm ntawm "demodulation".
Ultrasonic rangefinder muaj pes tsawg leeg thiab cov qauv
Lub tshuab hluav taws xob ultrasonic yog lub tshuab hluav taws xob ultrasonic. Ob chav timer EN556 (U2b) monostable txhais. R6 thiab C6 yog qhov sib txawv ntawm qhov sib txawv, nws lub luag haujlwm yog: thaum tus yuam sij S2 raug nias, theem qis rau hauv qhov zoo thiab qhov tsis zoo ntawm cov mem tes, tom qab VD1 kom tau txais qhov tsis zoo ntawm cov mem tes, ua rau lub monostable trigger flip-flop. Monostable flip-flop tso zis theem siab kav txog 1 ms, uas yog, tw ≈ 1.1R5C5 ≈ 1 ms. EN556 (U2n) tsim los ntawm ntau qhov kev sib raug zoo oscillator, av tiv thaiv tester oscillation zaus f1=1/T1 ≈ 1/0.7 [(R1 + R2) + 2 (R3 + R4)] C3 ≈ 40 kHz. lub oscillator oscillator los ntawm cov zis theem ntawm lub monostable trigger tswj. Thaum lub monostable trigger tso zis mus siab, lub polytuned oscillator oscillates thiab tus pin 5 ntawm EN556 outputs txog 40 daim duab pulses nrog ib zaus ntawm 40 kHz thiab lub luag hauj lwm voj voog ntawm txog 50%. Xav txog qhov tsis ruaj khov ntawm qhov pib-up theem ntawm polyharmonic oscillator, tus tsim yog tsim los kom plam ntau cov pulses. Yog hais tias tus naj npawb ntawm cov zis pulses tsawg dhau, qhov emission siv me me thiab qhov ntsuas qhov deb yog luv. Txawm li cas los xij, yog tias muaj pes tsawg tus pulses ntau dhau lawm, lub sijhawm tua hluav taws ntev ntev, thiab cov hlua pulse tseem tsis tau raug rho tawm haujlwm thaum nws nyob ze rau qhov ntsuas, uas ua rau lub ncha tsim los ntawm cov mem tes raug rho tawm ua ntej yuav mus txog qhov kawg tau txais. , cuam tshuam cov txiaj ntsig sib txawv thiab ua rau thaj tsam qhov muag tsis pom kev nce ntxiv. (U1) ntawm U1a ~ U1e ultrasonic mem tes tsav Circuit Court, yuav ua rau kom lub amplitude ntawm lub mem tes voltage tsav ultrasonic transmitting transducer, zoo hluav taws xob / acoustic hloov dua siab tshiab, txhim khu lub peev xwm kis tau tus ultrasonic tsis, nce qhov deb ntawm kev ntsuas. 40 kHz mem tes hlua tag nrho txoj kev los ntawm inverted los ntawm U1a, thiab ces los ntawm U1b thiab U1e parallel inverter inverted; Lwm txoj kev los ntawm South U1c thiab U1d parallel inverted los ntawm U1c thiab U1d inverted. Lwm tus yog inverted los ntawm parallel inverters ntawm U1c thiab U1d.
