Kub thiab siab sensor rau Cummins 3408627

Piezoelectric effect

Thaum qee qhov dielectrics deformed los ntawm kev siv lub zog hauv ib qho kev taw qhia, cov nqi raug tsim tawm ntawm ib qho chaw, thiab thaum lub zog sab nraud raug tshem tawm, lawv rov qab mus rau lub xeev tsis muaj nqi. Qhov tshwm sim no hu ua zoo piezoelectric effect. Thaum lub tshuab hluav taws xob tau siv rau hauv cov kev taw qhia polarization ntawm dielectric, lub dielectric yuav ua rau cov neeg kho tshuab deformation lossis mechanical siab nyob rau hauv ib qho kev taw qhia. Thaum cov hluav taws xob sab nraud raug tshem tawm, qhov deformation lossis kev ntxhov siab yuav ploj mus, uas yog hu ua inverse piezoelectric effect.

Piezoelectric Element

Piezoelectric sensor yog lub cev sensor thiab lub zog tsim hluav taws xob sensor. Cov khoom siv piezoelectric feem ntau yog Shi Ying siv lead ua (SiO2 _ 2) thiab hluavtaws piezoelectric ceramics.

Lub piezoelectric tas li ntawm piezoelectric ceramics yog ob peb zaug ntawm Shi Ying siv lead ua, thiab nws rhiab heev yog siab.

4) photoelectric transducer

1. photoelectric nyhuv

Thaum lub teeb irradiates ib yam khoom, nws tuaj yeem suav tias yog ib txoj hlua ntawm photons nrog lub zog e bombarding cov khoom. Yog hais tias lub zog ntawm photons loj txaus, cov electrons hauv cov khoom yuav tshem tawm cov kev txwv ntawm lub zog sab hauv thiab muaj cov khoom siv hluav taws xob sib xws, uas yog hu ua photoelectric effect.

1) Nyob rau hauv qhov kev txiav txim ntawm lub teeb, qhov tshwm sim uas electrons khiav tawm ntawm qhov chaw ntawm ib yam khoom yog hu ua sab nraud photoelectric nyhuv, xws li photoelectric raj thiab photomultiplier raj.

2) Raws li qhov kev txiav txim ntawm lub teeb, qhov tshwm sim uas qhov kev hloov pauv ntawm cov khoom hloov pauv yog hu ua cov nyhuv photoelectric, xws li photoresistor, photodiode, phototransistor thiab phototransistor.

3) Nyob rau hauv qhov kev txiav txim ntawm lub teeb, ib yam khoom tsim electromotive quab yuam nyob rau hauv ib tug tej yam kev taw qhia, uas yog hu ua photovoltaic phenomenon, xws li photovoltaic cell (ib tug ntaus ntawv rhiab rau txoj hauj lwm ntawm qhov teeb meem teeb pom kev zoo ntawm lub photosensitive nto).

2 Photosensitive resistor

Thaum lub photoresistor yog irradiated los ntawm lub teeb, electrons migrate los tsim electron-qhov khub, uas ua rau lub resistivity me me. Lub teeb muaj zog dua, qhov ua haujlwm qis dua. Qhov teeb meem teeb meem ploj mus, cov khub electron-qhov rov zoo, thiab tus nqi kuj maj mam rov qab los rau nws tus nqi qub.

3. Photosensitive raj

Photosensitive hlab (photodiode, phototransistor, phototransistor, thiab lwm yam) belongs rau cov khoom siv semiconductor.

4. Electroluminescence

Lub luminescence tshwm sim ua los ntawm cov khoom luminescent khoom nyob rau hauv lub excitation ntawm hluav taws xob teb yog hu ua electroluminescence. Electroluminescence yog txheej txheem ntawm kev hloov hluav taws xob ncaj qha rau hauv lub teeb lub zog. Lub teeb-emitting diode (LED) yog ib qho khoom siv hluav taws xob semiconductor electroluminescent doped nrog cov ntaub ntawv tshwj xeeb. Thaum lub PN hlws ris yog rau pem hauv ntej biased, ntau zog yog generated vim electron-qhov recombination, uas yog tso tawm nyob rau hauv daim ntawv ntawm photons thiab emits lub teeb.