Dab tsi yog hom dej theem sensors?

Dab tsi yog hom dej theem sensors?
Nov yog 7 hom kua theem sensors rau koj siv:

1. Optical dej theem sensor
Lub optical sensor yog solid-state. Lawv siv infrared LEDs thiab phototransistors, thiab thaum lub sensor nyob hauv huab cua, lawv tau optically ua ke. Thaum lub taub hau sensor yog raus rau hauv cov kua, lub teeb infrared yuav khiav, ua rau cov zis hloov pauv. Cov sensors no tuaj yeem kuaj pom qhov muaj lossis tsis muaj cov kua yuav luag. Lawv tsis rhiab rau ambient lub teeb, tsis cuam tshuam los ntawm ua npuas ncauj thaum nyob hauv huab cua, thiab tsis cuam tshuam los ntawm cov npuas me me thaum ua kua. Qhov no ua rau lawv muaj txiaj ntsig zoo hauv cov xwm txheej uas lub xeev cov kev hloov pauv yuav tsum tau sau tseg sai thiab ntseeg tau, thiab nyob rau hauv cov xwm txheej uas lawv tuaj yeem ua haujlwm tau zoo rau lub sijhawm ntev yam tsis muaj kev saib xyuas.
Qhov zoo: kev ntsuas tsis sib cuag, qhov tseeb siab, thiab teb ceev ceev.
Disadvantages: Tsis txhob siv nyob rau hauv lub hnub ncaj qha, dej vapor yuav cuam tshuam qhov ntsuas qhov tseeb.

2. Capacitance kua theem sensor
Capacitance qib switches siv 2 conductive electrodes (feem ntau yog ua los ntawm hlau) nyob rau hauv Circuit Court, thiab qhov deb ntawm lawv yog luv heev. Thaum cov electrode yog immersed nyob rau hauv cov kua, nws ua tiav Circuit Court.
Qhov zoo: tuaj yeem siv los txiav txim siab qhov nce lossis poob ntawm cov kua hauv lub thawv. Los ntawm kev ua cov electrode thiab lub thawv rau tib qhov siab, lub capacitance ntawm cov electrodes tuaj yeem ntsuas. Tsis muaj capacitance txhais tau tias tsis muaj kua. Ib lub capacitance tag nrho sawv cev rau lub thawv tiav. Qhov ntsuas qhov ntsuas ntawm "dub" thiab "tag nrho" yuav tsum tau sau tseg, thiab tom qab ntawd 0% thiab 100% calibrated meters yog siv los tso saib cov kua theem.
Disadvantages: Lub corrosion ntawm electrode yuav hloov lub capacitance ntawm electrode, thiab nws yuav tsum tau muab ntxuav los yog recalibrated.

3. Tuning diav rawg theem sensor
Qhov kev sib tw diav rawg yog cov kua theem hloov mus hloov cuab yeej tsim los ntawm lub broting dolling dolling dolling dolling dolling dolling rolling rolling. Lub hauv paus ntsiab lus ua haujlwm ntawm kev hloov pauv yog ua rau nws qhov kev vibration los ntawm lub resonance ntawm piezoelectric siv lead ua.
Txhua yam khoom muaj nws cov zaus resonant. Lub resonant zaus ntawm cov khoom muaj feem xyuam rau qhov loj, loj, zoo li, quab yuam… ntawm cov khoom. Ib qho piv txwv ntawm qhov resonant zaus ntawm cov khoom yog: tib lub khob khob nyob rau hauv kab Sau nrog dej ntawm qhov siab sib txawv, koj tuaj yeem ua qhov kev ua suab paj nruag los ntawm tapping.

Qhov zoo: Nws tuaj yeem cuam tshuam tiag tiag los ntawm kev ntws, npuas, hom kua, thiab lwm yam, thiab tsis tas yuav tsum tau calibration.
Disadvantages: Tsis tuaj yeem siv rau hauv cov xov xwm viscous.

4. Diaphragm kua theem sensor
Lub diaphragm los yog pneumatic qib hloov pauv nyob ntawm huab cua siab los thawb lub diaphragm, uas koom nrog lub micro hloov hauv lub cev tseem ceeb ntawm lub cuab yeej. Raws li cov kua theem nce, lub siab sab hauv hauv lub raj kuaj pom yuav nce mus txog thaum lub microswitch qhib. Raws li cov kua theem qis, cov huab cua siab kuj poob, thiab qhov hloov pauv qhib.
Qhov zoo: Tsis tas yuav muaj lub zog hauv lub tank, nws tuaj yeem siv tau nrog ntau hom kua, thiab qhov hloov pauv yuav tsis tuaj yeem cuam tshuam nrog cov kua dej.
Disadvantages: Txij li thaum nws yog ib qho cuab yeej siv tshuab, nws yuav xav tau kev saib xyuas lub sijhawm.

5.Float dej theem sensor
Lub float hloov yog thawj theem sensor. Lawv yog cov cuab yeej siv tshuab. Lub hollow ntab yog txuas nrog caj npab. Thaum lub ntab nce thiab ntog hauv cov kua, lub caj npab yuav raug thawb nce thiab nqis. Lub caj npab tuaj yeem txuas nrog lub tshuab sib nqus los yog lub tshuab hluav taws xob los txiav txim siab rau / tawm, lossis nws tuaj yeem txuas nrog lub ntsuas ntsuas uas hloov pauv los ntawm tag nrho mus rau qhov khoob thaum cov kua dej poob.

Kev siv float keyboards rau cov twj tso kua mis yog ib qho kev lag luam thiab siv tau zoo los ntsuas cov dej hauv lub qhov dej hauv qab daus.
Qhov zoo: Lub ntab hloov pauv tuaj yeem ntsuas txhua hom kua thiab tuaj yeem tsim los ua haujlwm yam tsis muaj hluav taws xob.
Qhov tsis zoo: Lawv loj dua li lwm hom keyboards, thiab vim tias lawv yog cov neeg kho tshuab, lawv yuav tsum tau siv ntau dua li lwm cov keyboards.

6. Ultrasonic kua theem sensor
Ultrasonic qib ntsuas yog ntsuas qib digital tswj los ntawm microprocessor. Hauv kev ntsuas, ultrasonic pulse yog tawm los ntawm lub sensor (transducer). Lub suab nthwv dej yog reflected los ntawm cov kua nto thiab tau txais los ntawm tib lub sensor. Nws yog hloov dua siab tshiab rau hauv lub teeb liab hluav taws xob los ntawm piezoelectric siv lead ua. Lub sijhawm nruab nrab ntawm kev sib kis thiab txais lub suab nthwv dej yog siv los ntsuas qhov ntsuas ntawm qhov deb ntawm cov kua dej.
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm ultrasonic qib sensor yog tias lub ultrasonic transducer (kev sojntsuam) xa tawm lub suab nrawm nrawm nrawm thaum nws ntsib qhov ntsuas qhov ntsuas (khoom), yog qhov cuam tshuam, thiab lub suab nrov tau txais los ntawm lub suab nrov. transducer thiab hloov mus rau hauv hluav taws xob teeb liab. Lub sijhawm nthuav tawm ntawm lub suab nthwv dej. Nws yog proportional rau qhov kev ncua deb ntawm lub suab yoj mus rau saum npoo ntawm cov khoom. Kev sib raug zoo ntawm lub suab nthwv dej sib kis nyob deb S thiab lub suab ceev C thiab lub sij hawm xa suab T tuaj yeem qhia los ntawm tus qauv: S = C × T / 2.

Qhov zoo: kev ntsuas tsis sib cuag, qhov ntsuas nruab nrab yog yuav luag tsis txwv, thiab nws tuaj yeem siv dav rau kev ntsuas qhov siab ntawm ntau yam kua thiab cov khoom siv.
Disadvantages: Qhov ntsuas qhov tseeb yog qhov cuam tshuam zoo heev los ntawm qhov kub thiab plua plav ntawm ib puag ncig tam sim no.

7. Radar qib ntsuas
Lub radar kua theem yog cov kua theem ntsuas ntsuas raws li lub hauv paus ntsiab lus ntawm lub sijhawm mus ncig. Lub radar nthwv dej khiav ntawm lub teeb nrawm, thiab lub sijhawm khiav tuaj yeem hloov pauv mus rau theem teeb liab los ntawm cov khoom siv hluav taws xob. Kev sojntsuam xa tawm cov pulses high-frequency pulses uas mus ntawm qhov ceev ntawm lub teeb nyob rau hauv qhov chaw, thiab thaum lub pulses tau raws li qhov saum npoo ntawm cov khoom, lawv tau reflected thiab tau txais los ntawm lub receiver nyob rau hauv lub 'meter', thiab qhov kev ncua deb teeb liab yog hloov dua siab tshiab rau hauv ib theem. teeb liab.
Qhov zoo: dav siv ntau yam, tsis cuam tshuam los ntawm qhov kub thiab txias, plua plav, chav, thiab lwm yam.
Disadvantages: Nws yog ib qho yooj yim los tsim kev cuam tshuam echo, uas cuam tshuam rau qhov ntsuas qhov tseeb.