Dab tsi yog NTC Kub Sensor?

Dab tsi yog NTC Kub Sensor?

Txhawm rau nkag siab txog kev ua haujlwm thiab kev siv ntawm NTC ntsuas kub, peb yuav tsum xub paub tias NTC thermistor yog dab tsi.
NTC kub sensor ua haujlwm yooj yim piav qhia li cas
Kub conductors los yog sov conductors yog hluav taws xob resistors nrog tsis zoo kub coefficients (NTC luv luv). Yog tias tam sim no ntws los ntawm cov khoom, lawv cov kev tiv thaiv yuav txo qis nrog qhov kub thiab txias. Yog hais tias qhov kub thiab txias ambient poob (xws li nyob rau hauv lub tes tsho immersion), lub Cheebtsam, ntawm qhov tod tes, react nrog nce kuj. Vim yog tus cwj pwm tshwj xeeb no, cov kws tshaj lij kuj xa mus rau NTC resistor raws li NTC Thermistor.

Hluav taws xob kuj txo qis thaum electrons txav
NTC resistors muaj cov khoom siv semiconductor, uas feem ntau yog nruab nrab ntawm cov hluav taws xob hluav taws xob thiab cov hluav taws xob tsis yog hluav taws xob. Yog hais tias lub Cheebtsam kub, electrons loosen los ntawm lub lattice atoms. Lawv tawm ntawm lawv qhov chaw hauv cov qauv thiab thauj hluav taws xob zoo dua. Qhov tshwm sim: Nrog nce qhov kub thiab txias, thermistors ua hluav taws xob zoo dua - lawv cov hluav taws xob tsis kam txo. Cov khoom siv yog siv, ntawm lwm yam, raws li qhov ntsuas kub, tab sis rau qhov no lawv yuav tsum tau txuas nrog lub zog hluav taws xob thiab ammeter.

Kev tsim khoom thiab cov khoom ntawm cov kub thiab txias conductors
Ib qho NTC resistor tuaj yeem hnov ​​​​mob tsis muaj zog lossis, hauv qee qhov chaw, muaj zog heev rau kev hloov pauv ntawm qhov kub thiab txias. Tus cwj pwm tshwj xeeb yeej nyob ntawm kev tsim cov khoom. Ua li no, cov neeg tsim khoom hloov pauv qhov sib xyaw ntawm oxides lossis doping ntawm cov hlau oxides rau qhov xav tau. Tab sis cov khoom ntawm cov khoom tseem tuaj yeem cuam tshuam nrog kev tsim khoom nws tus kheej. Piv txwv li, los ntawm cov ntsiab lus oxygen nyob rau hauv qhov hluav taws kub cua los yog tus nqi cua txias ntawm cov khoom.

Cov ntaub ntawv sib txawv rau NTC resistor
Cov ntaub ntawv ntshiab semiconductor, compound semiconductors lossis metallic alloys yog siv los xyuas kom meej tias cov thermistor qhia lawv tus cwj pwm. Cov tom kawg feem ntau muaj cov hlau oxides (cov khoom ntawm cov hlau thiab oxygen) ntawm manganese, npib tsib xee, cobalt, hlau, tooj liab lossis titanium. Cov ntaub ntawv yog sib xyaw nrog cov neeg ua haujlwm khi, nias thiab sintered. Cov neeg tsim khoom ua kom sov cov ntaub ntawv raw nyob rau hauv kev kub siab rau xws li ib qho kev ua haujlwm nrog cov khoom xav tau tsim.

Cov yam ntxwv ntawm lub thermistor ntawm ib nrais muag
NTC resistor muaj nyob rau hauv thaj tsam ntawm ib ohm mus rau 100 megohms. Cov khoom siv tuaj yeem siv los ntawm rho tawm 60 mus rau ntxiv rau 200 degrees Celsius thiab ua tiav qhov siab ntawm 0.1 txog 20 feem pua. Thaum nws los txog rau kev xaiv lub thermistor, ntau yam kev ntsuas yuav tsum raug coj mus rau hauv tus account. Ib qho tseem ceeb tshaj plaws yog qhov nominal tsis kam. Nws qhia txog tus nqi tiv thaiv ntawm qhov ntsuas nominal (feem ntau 25 degrees Celsius) thiab cim nrog lub peev R thiab qhov kub thiab txias. Piv txwv li, R25 rau tus nqi kuj ntawm 25 degrees Celsius. Cov cwj pwm tshwj xeeb ntawm qhov kub sib txawv kuj tseem cuam tshuam. Qhov no tuaj yeem teev nrog cov ntxhuav, cov qauv lossis cov duab kos thiab yuav tsum sib phim rau daim ntawv thov xav tau. Ntxiv cov yam ntxwv tseem ceeb ntawm NTC resistors muaj feem xyuam rau qhov kam rau ua nrog rau qee qhov ntsuas kub thiab qhov ntsuas hluav taws xob.

Qhov sib txawv ntawm daim ntawv thov rau NTC resistor
Ib yam li PTC resistor, NTC resistor kuj tsim nyog rau kev ntsuas kub. Tus nqi kuj hloov pauv nyob ntawm qhov kub thiab txias. Txhawm rau kom tsis txhob dag cov txiaj ntsig, qhov ntsuas kub ntawm tus kheej yuav tsum raug txwv kom ntau li ntau tau. Txawm li cas los xij, nws tus kheej cua sov thaum lub sij hawm ntws tam sim no tuaj yeem siv los txwv cov inrush tam sim no. Vim tias NTC resistor txias tom qab hloov cov khoom siv hluav taws xob, yog li ntawd tsuas yog me ntsis tam sim no ntws thaum xub thawj. Tom qab qee lub sijhawm hauv kev ua haujlwm, lub thermistor heats li, cov hluav taws xob tsis kam poob thiab ntau qhov tam sim no ntws. Cov khoom siv hluav taws xob ua tiav lawv qhov kev ua tau zoo tag nrho hauv txoj kev no nrog rau lub sijhawm ncua sijhawm.

Lub NTC resistor ua hluav taws xob tam sim no tsis zoo nyob rau qhov kub thiab txias. Yog hais tias qhov kub thiab txias ambient nce, qhov tsis kam ntawm qhov hu ua sov so conductors txo qis. Tus cwj pwm tshwj xeeb ntawm cov khoom siv semiconductor tuaj yeem siv feem ntau rau kev ntsuas kub, rau kev txwv tam sim no lossis rau ncua ntau yam kev sib txuas.