Daga cikin nau'ikan na'urori masu tsabtace zafin jiki - thermocopples, thermorance na'urori na'urori - yanayin zafi, firikwenor na da zabi ne na likita da kuma kiwon lafiya. Daidai, ba sa buƙatar layi -uki, suna ba da kariya mai kyau kuma suna da sauƙin haɗawa da na'urorin kiwon lafiya da kuma m. Don abin da ba shi da ƙima, ana iya amfani da thermometer.
Sigar Maɓallin sigari ne, amfani da wutar lantarki da tunanin zafi. Na karshe yana da mahimmanci ga daidaitaccen yanayin karatun asibiti saboda ko da ƙarfin fasahar zamani (μW) na iya zafi da firikwensin da haifar da karanta rashin tsari. Wani tunani na wani nau'in ke dubawa (dijital ko analogue), wanda zai tantance abubuwan da alaƙa, kamar microctroller.
Daidaito na asibiti
Haɗu da daidaitawar asibiti, kowace asm E112 (Hanyoyin Gwajin Gwaji don tantance girman hatsi), yana farawa da firikwensin da ya dace. Maxim hade da Maxim, Proffors zazzabi na dijital, misali, fasalin ° 0.15 ° Cikract daga 0 ° C to 70 ° C. (Maxim United aka samu ta hanyar na'urorin Analog a cikin Agusta 2021.) Na'urorin sun auna 2x2x0.75mm kuma suna cikin kunshin bakin ciki (Hoto 1). ICS tana aiki daga wadataccen wadatar wadata na 1.7v-3.6v kuma cinye kasa da 67La a cikin aiki da 0,5a a cikin aiki da 0,59 a jiran aiki.
Yana da mahimmanci cewa zazzabi na firam ɗin ba ya tasiri batun karatun Na'urar da ke da alama. Zuwa na Sensor, wanda yayi tafiya daga PCB ta hanyar kunshin, yana haifar da firikwensin mutuwa kuma yana iya shafar daidaito. A cikin firikwensin zazzabi IC, wannan zafi ana gudanar da wannan zafin ta hanyar kunshin da ƙarfe na karfe akan underside na kunshin, yana haifar da dumama. Wannan na iya haifar da heleral here da kuma daga wasu fil, tsoma baki tare da ma'aunin zazzabi.
Akwai da yawa fasahohi don magance dumama. Za'a iya amfani da wuraren baƙin ciki don rage girman ƙimar da ke nesa da na iC. Masu zane-zane na iya auna yawan zafin jiki a saman kunshin, har zuwa yau da yiwuwar daga iC-pins, maimakon amfani da kushin thermal. Wannan shi ne ga max30208clb + da sauran max30208 firikwensin zazzabi.
Wani zaɓi shine a sanya wasu abubuwan haɗin lantarki gwargwadon abin da zai yiwu don rage tasirin su akan ma'aunin zafin jiki.
Tunanin ƙirar thermal
Don tabbatar da ketalwalin Hiski daga hanyoyin zafi a cikin na'urorin da ke da kullun can dole ne ya kasance kyakkyawan hanyar zafi tsakanin zafin jiki da fata na mai amfani. Matsayin karkashin kunshin ya sa ya kalubalanci wa PCB don hanya waƙoƙi na ƙarfe daga mahimmin tare da jiki.
Ya kamata a tsara tsarin saboda firikwensin yana da kusanci zuwa zafin jiki da za a auna. Amfani da Max30208, masu zane-zane, kayan zane da faci na likita zasu iya amfani da madaidaiciya ko semi-m picks. Za'a iya haɗa mahimmin zafin jiki na dijital kai tsaye zuwa microcontrrarler ta amfani da kebul mai sauƙin amfani da kebul mai sauƙin folat.
Yana da mahimmanci a sanya Sensor Sensor IC akan sassauya gefen PCB, wanda ke rage juriya tsakanin fata da firikwensin. Masu zanen kaya su rage karfin kauri don sassauya ingantaccen lamba da mafi kyawun lamba.
Digital zazzabi na'urori masu auna sigina suna yawanci nasaba microcontrollers via wani I2C serial dubawa. Maxim ta MAX30208CLB +, misali, yana amfani da wani 32-kalma na farko a cikin na farko fitar don ƙirƙirar zazzabi haska saitin littãfi miƙa har zuwa 32 zazzabi karatu, kowane hada da biyu bytes. Wannan damar da microcontroller zuwa barci mika lokaci don kare ikon (Figure 2). Ƙwaƙwalwar-tsara rajista ma da damar na'urori masu auna sigina zuwa tayin high da kuma low dokin dijital zazzabi ƙararrawa.
A general manufar shigar da / fitarwa fil za a iya kaga fararwa da zazzabi hira da wani kaga don samar da wani soke for selectable matsayi ragowa.
factory k
Mutane da yawa dijital zazzabi na'urori masu auna sigina ne factory-calibrated, kawar da buƙata domin recalibration sau daya a shekara, kamar yadda shi ne yanayin da yawa wasiyya da zazzabi masu auna sigina. Wannan bypasses da bukatar ci gaba software zuwa linearise da fitarwa, kazalika da canzawa da lafiya-tune da kewaye. Bugu da ƙari, shi gusar da bukatar mahara daidaici aka gyara da kuma minimizes hadarin impedance mismatches.
A AS621x iyali na zazzabi na'urori masu auna sigina daga AMS ne factory calibrated kuma yana da Hadakar linearisation (Figure 3). Shi ma yana da takwas I2C adiresoshin ga zafin jiki monitoring a takwas m zafi spots via guda bas. A serial dubawa da mahara I2C adireshin sa a yi prototyping da kuma tsara tabbaci sauki.
Versions daidai to ± 0.2 ° C, ± 0.4 ° C da kuma ± 0.8 ° C suna samuwa. Domin kiwon lafiya da alaka da sa idanu tsarin, daidaito a cikin ± 0.2 ° C ishe (da AS6212-AWLT-L). All AS621x na'urorin da 16bit ƙuduri gano kananan saɓani a cikin zafin jiki a kan -40 ° C zuwa + 125 ° C aiki kewayo.
A AS621x ƙaddara 1.5mm2 kuma zo a cikin wani wafer matakin guntu sikelin kunshin. Supply ƙarfin lantarki ne 1.71V da 6μA amfani a lokacin aiki da kuma 0.1μA a jiran aiki, yin AS6212-AWLT-L musamman dace da baturi-powered aikace-aikace.
Contactless zazzabi na'urori masu auna sigina
Infrared thermometers yi ba lamba da zazzabi ma'aunai na yanayi zazzabi da yawan zafin jiki na wani abu.
Irin wannan thermometers gano wani makamashi sama 0 Kelvin (cikakkar sifili) jefarwa da wani abu a gaban ta na'urar. A injimin gano illa sabobin tuba da makamashi a cikin wani sakonni, da ya wuce shi zuwa wani processor fassara da kuma nuna data bayan compensating for bambancin lalacewa ta hanyar yanayi zazzabi.
An misali ne MLX90614ESF-BCH-000-TU infrared ma'aunin zafi da sanyio daga Melexis. Yana hada da wani infrared thermopile injimin gano illa guntu da wata sigina motsa jiki guntu batutuwa a cikin wani TO-39 kunshin (Figure 4). Akwai kuma wani low amo amfilifa, 17-bit analogue zuwa dijital Converter da sigina na dijital processor ga daidaito da kuma ƙuduri.
A infrared thermometers ne factory calibrated ga zazzabi kewayon -40 ° C zuwa 85 ° C (na yanayi) da kuma -70 ° C zuwa 382,2 ° C for abu zazzabi. Standard daidaito ne 0.5 ° C a dakin da zazzabi.
A haska ne factory calibrated tare da wani dijital SMBus fitarwa da kuma yana da wani ƙuduri na 0.02 ° C. A madadin, designers iya saita da 10bit bugun jini nisa daidaitowa (PWM) dijital fitarwa da wani ƙuduri na 0,14 ° C.
Development support
A MAX30208 na'urori masu auna sigina suna da goyan bayan da MAX30208EVSYS # kimantawa tsarin, wanda ya hada da wani lankwasa PCB rike da MAX30208 zazzabi haska IC (Figure 5). A MAX32630FTHR microcontroller kwamitin da MAX30208 dubawa kwamitin suna da alaka via buga kwallo. A kimantawa hardware za a iya haɗa wani PC ta amfani da kebul na USB. A tsarin zai sa'an nan ta atomatik shigar da zama dole na'urar direbobi shirye domin EV kit software da za a sauke.
Domin aunawa jiki zafin jiki a wurare da yawa, MAX30208 zazzabi ICs za a iya haɗa via I2C adiresoshin a Daisy-sarkar tsari zuwa guda baturi kuma rundunar microcontroller. Kowane zazzabi haska an polled da microcontroller a kai a kai don ƙirƙirar bayanin martaba na gida da dukan-yanayin jiki.
Masu haɓakawa na iya amfani da Mikroe-1362 na farinel tare da Mikroelektronika don amfani da MLX90614 infrared firstor.Wannan yana danganta da mlx90614esf-aaa Single Single Singer-Yankin Infuleoomer Someromer zuwa ga Microontros Board ta ko dai mikrobus I2C (Hoto 6).
An kwankwala da kwamitin 5V don -40 ° C zuwa 85 ° CIcizan zazzabi da -70 ° C to + 380 ° C Abun Yanayin zafin jiki.
