Cov kws tshaj lij qhia lawv cov kev paub hauv kev debugging infrared ntsuas kub
1. Cov teeb meem uas tshwm sim:
1. Calibration tsis yooj yim thiab rub tawm yog qhov nyuaj; muaj kev cuam tshuam ntau ntawm cov khoom siv sab hauv.
2. Tus nqi ntsuas kub tsis ruaj khov thiab dhia nce thiab nqis.
3. Muaj 15 degree dhia tom qab qhov kub nce mus txog 900 degree.
2. Kev txheeb xyuas qhov teeb meem:
1. Tus qauv tsim ntawm qhov chaw nres nkoj rub tawm tsis raug, tsuas yog cov chaw nres nkoj xws li kev debugging online raug coj tawm, thiab RXD thiab TXD tsis raug coj tawm; PCB tsim yog qhov tsis tsim nyog, thiab kev teeb tsa hluav taws xob tsis zoo.
2. Qhov teeb meem ntawm kev siv hluav taws xob sab hauv, lub zog hluav taws xob ripple yog qhov loj heev, tshwj xeeb tshaj yog cov nyhuv ripple ntawm MCU siv hluav taws xob tseem ceeb heev, qhov me dua qhov zoo dua.
3. When the temperature rises, use an oscilloscope to measure the ADC input waveform as a sine wave before the temperature value jumps. After the jump, the waveform is smooth. When the temperature drops, the waveform is very smooth before the laser is turned on, and the laser turns into a sine wave again. The analysis shows that the amplifier circuit has Self-excited oscillation, the beating after 900 degrees is caused by the oscillation to stop the vibration, when the oscillation cannot be maintained at a certain temperature, the vibration will stop, it will be the average value, and there will also be a sudden change at this time, so there is a 15 degree beating; because The start-up condition is higher than the oscillation condition, so the temperature drops until the laser starts to oscillate. From the back to the front, the oscillation of the result measured with an oscilloscope comes from the first-stage amplifier circuit. To realize sine wave self-excited oscillation, there is a frequency f0 in the low frequency or high frequency band, so that the additional phase shift generated by the circuit is ±∏, and when f=f0 |AF|>1, tus kheej zoo siab oscillation yuav tshwm sim. Ntxiv nrog rau kev txiav txim siab los ntawm qhov tsis kam thiab capacitance nyob rau hauv Circuit Court, qhov zaus oscillation kuj nyob ntawm qhov tsis paub tseeb xws li interelectrode capacitance ntawm transistor thiab faib capacitance ntawm Circuit Court. (Lub sine yoj oscillating Circuit Court yuav tsum txaus siab 0 degree los yog 360 degree integral ntau flipping, uas yog, ∮=2n∏, thiab |AF|=1, tab sis lub start-up mob yog|AF|1).
3. daws qhov teeb meem:
1. Rov tsim kho lub voj voog thiab coj mus rau lwm qhov chaw nres nkoj kom paub txog cov haujlwm ntawm cov chaw nres nkoj serial download thiab calibration cov ntaub ntawv ntawm lub sijhawm hlawv, uas ua rau kev ua haujlwm yooj yim, yooj yim rau calibrate, thiab cov ntaub ntawv raug ntau dua; re-layout thiab xaim, kom cov txheej hauv qab muaj qhov loj ntawm tooj liab (txuas rau hauv av), kom txo tau qhov cuam tshuam ntawm cov khoom siv.
2. Xaiv lub siab-precision voltage regulator nti kom txo tau qhov ripple ntawm cov khoom siv hluav taws xob, thiab ntxiv RC lim circuit lossis lim capacitor ncaj qha ua ntej cov tswv yim. Nyob rau hauv txoj kev no, kev ua haujlwm ntawm MCU, kev ua haujlwm amplifier, voltage-rau-tam sim no thiab lwm yam chips yuav ruaj khov. Qhov ruaj khov siv hluav taws xob ua rau cov ntaub ntawv sab hauv ntawm MCU ruaj khov, thiab cov ntaub ntawv tso tawm yog qhov sib txuam ruaj khov thiab raug.
3. Qhov teeb meem no tau debugged rau lub sijhawm ntev, thiab ntau txoj hauv kev tau siv los ntawm kev paub txog kev xav, tab sis qee qhov teebmeem tsis pom tseeb. ①. Hloov qhov magnification (hloov tus nqi tawm tswv yim tawm tswv yim), yog tias qhov magnification loj dhau, oscillation yuav tshwm sim. Tab sis tsis muaj lus teb rau kev hloov pauv tus nqi tiv thaiv ntawm kaum ob ntawm K hauv Circuit Court no, thiab nws tseem zoo li qub. Qhov laj thawj yog vim li cas qhov kev tiv thaiv sab hauv ntawm lub ntes yog loj heev, yog li hloov qhov kev tiv thaiv tsis tshua muaj txiaj ntsig; Piv nrog rau qhov qub waveform, qhov zaus oscillation yuav nrawm dua, thiab qhov oscillation ntau yam yog qhov dav, thiab oscillation tsis tau nres thaum qhov kub siab tshaj qhov muaj txiaj ntsig zoo; ③. Raws li lub hauv paus ntawm ②, lub ntsiab lus tseem ceeb ntawm cov zis tawm kuj tseem yog qhov kev nthuav qhia thib ob Ntxiv rau RC lim Circuit Court ntawm qhov taw tes, cov nyhuv yog pom tseeb heev. Tom qab muab tus nqi tsim nyog, lub waveform ntawm ADC, uas yog, qhov chaw tso zis ntawm qhov kev nthuav dav thib ob, ua du thiab tsis muaj dhia. Qhov no yog ib txoj kev zoo heev, tab sis lub pre-amplification tseem muaj oscillation, uas yuav muaj qee yam cuam tshuam rau cov ntaub ntawv, yog li peb yuav tsum xav txog lwm txoj hauv kev los tiv thaiv lub voj voog ntawm oscillating; ④, vim hais tias tus ntes yog ua los ntawm tus PIN diode, thiab tus PIN diode muaj ib lub peev xwm capacitive, yog li nws yuav muab tso ua ke nrog cov lus tawm tswv yim resistor los tsim ib tug RC oscillator circuit. Yog hais tias lub capacitive ib feem ntawm tus PIN diode tsis muaj zog thiab hloov mus rau hauv ib tug resistive, nws tus kheej-zoo siab oscillation yuav tsis tshwm sim, yog li ntawd muaj ib tug series kev twb kev txuas nyob rau hauv nws. Qhov tsim nyog tiv thaiv waveform kuj ua tau zoo nkauj heev, tab sis tseem muaj qhov dhia ntawm 900 degree, yog li cov oscillation ntau yuav tsum tau txuas ntxiv, ② cov kauj ruam tseem yuav tsum tau ua.
Plaub, debugging kev:
1. Kev siv cov oscilloscopes digital, xws li cov ntaub ntawv nyeem thiab hloov kho, tsis tau mus txog ib theem ntawm kev kho vajtse debugging, thiab tsis muaj peev xwm txaus los txheeb xyuas qhov teeb meem ntawm kev xav. Oscilloscopes yog cov cuab yeej tseem ceeb. Hauv kev siv lub oscilloscope, ①, siv cov iav tsim nyog, xws li: siv AC iav los ntsuas qhov ripple ntawm lub hwj huam mov, yog tias koj siv DC iav, tsis muaj lus teb thaum lub teeb liab AC me me yog superimposed ntawm lub DC; ②, grounding thaum lub sij hawm xeem Nco ntsoov yuav tsum nyob ze rau qhov chaw xeem.
2. Txaus siab rau qee qhov kev ua haujlwm ntawm RC lim circuits. RC circuits muaj ntau lub hom phiaj thaum siv nyob rau hauv ntau qhov chaw. Raws li qhov kev txhawj xeeb no, RC ntawm lub taub hau sojntsuam tsim oscillations, thiab peb tsis xav tau cov oscillations tom qab. Wave, peb tuaj yeem siv RC Circuit Court los lim tawm cov nthwv dej no, nws zaus f=1/2∏RC, qhov no yog lub passband nyob rau hauv lub zaus xaiv Circuit Court, thiab nyob rau hauv lub lim Circuit Court, nws yog los lim tawm cov clutter nyob rau hauv. no zaus band.
3. Qhov teeb meem capacitive ntawm diodes. Cov neeg feem coob yuav tsis quav ntsej qhov capacitive ntawm diodes thaum lawv siv diodes. Tshwj xeeb, PIN diodes muaj lub peev xwm muaj zog dua vim yog ib feem ntawm cov khoom siv hluav taws xob hauv nruab nrab ntawm PN kev sib tshuam, uas tuaj yeem sib npaug rau kev sib txuas. Ib tug loj capacitor ntxiv, thiab lub capacitor no thiab cov lus tawm tswv yim resistor tsim ib qho RC oscillation Circuit Court, thiab muaj qhov teeb meem thib peb-muaj 15 degree dhia ntawm ib ncig ntawm 900 degree, thiab cov zaub kub tsis ruaj khov tom qab dhia.
