Ultrasonic transducers yog siv ntau qhov kev lag luam thiab kev kho mob. Nyeem rau kom paub txog lawv seem loj thiab lawv ua haujlwm li cas.
Lub tshuab hloov hluav taws xob
Cov hloov khoom siv yog cov twj tshwj xeeb uas muaj peev xwm tig ib hom zog rau lwm qhov. Ib lub transducer yog ib qho tseem ceeb ntawm sonography lossis ultrasonic kev ntsuas. Nyob rau hauv sonography, lub koob yees duab yog lub transducer. Thaum them tus nqi hluav taws xob rau lub koob yees duab, lub koob yees duab hloov lub zog no mus rau hauv kev tseeg. Qhov no paub li cov nyhuv piezoelectric. Qhov tshee tshee ua ib qho suab nrov. Lub koob yees duab yog tsim los ntawm ntau yam. Txhua ntawm cov khoom sib txuas ua lub luag haujlwm hauv kev tsim cov suab nrov, kis tau los ntawm cov suab no rau hauv lub cev, thiab txais tos ntawm ncha los ntawm lub cev.
Piezoelectric Muaju Lub Npe
Lub koob yees duab lub ntsiab feem yog cov piezoelectric muaju . Cov muaju hauv ultrasonic transducer feem ntau yog cov khoom siv hluavtaws ua los ntawm PZT (lead zirconate titanate). Lub muaju tsim vibrations thaum voltage siv rau lawv. Kev co zaus yog nyob ntawm qhov ntsuas hluav taws xob ntau npaum li cas rau cov muaju thiab lub suab nthwv dej 'zaus nyob ntawm qhov zaus ua kom nrov.
Ua kom pom tseeb
Cov siv lead ua siv nyob rau hauv ultrasonic transducer muaj cov duab uas zoo sib xws rau lub kauj voj. Lub suab nqaj yog kwv yees los ntawm cov siv lead ua. Thaum xub thawj, txoj kab uas hla ntawm lub suab nqaj yog tib yam li ntawm qhov siv lead ua. Thaum lub nqaj lub cheeb txo mus rau ib nrab ntawm nws lub taub qub, qhov ua kom pom tseeb tau ncav cuag. Qhov lub cheeb nce dua tom qab ua kom pom tseeb. Txhawm rau ua kom muaj peev xwm tsim cov duab uas yog ob qho ntev, ib qho ultrasonic transducer siv ntau ntawm cov khoom hluav taws xob piezoelectric.
Chaw
Nws yog ib qho tseem ceeb yuav tau hloov kho qhov chaw ntawm lub tshuab ua pa. Yog vim tias qhov nqaj lub ntuj tsom tsis tau txaus kom tau txais cov duab tseeb ntawm cov ntu tshwj xeeb. Qhov ua kom pom tseeb nyob ntawm qhov kev ncua deb ntawm lub tshuab hloov mus thiab ib feem. Txhawm rau txhim kho kev tsom xam, cov twj paj nruag xws li tsom iav thiab lo ntsiab muag tau siv. Lub sonographer hloov cov chaw ntawm lub tshuab ultrasonic kom tswj hauv kev tsom xam hauv hluav taws xob. Thaum ua kom pom tseeb hloov mus, cov ultrasonic transducer siv hluav taws xob ntawm ntau zaus mus rau muaju txawv. Qhov no yog li cas lub nqaj tsom mus rau kev hloov pauv.
Acoustic Impedance
Qhov hnov mob tsis haum yog tshwm sim los ntawm lub suab yoj lub suab thiab cov khoom ntom ntom. Lub suab yoj lub suab tawm ntawm cov khoom siv nws kis tau dhau los. Nws yog ib qho nyuaj kom muaj kev nyeem ntawv sonogram thaum cov ntaub ntawv tsis muaj tib lub suab sib txawv. Yog vim tias lub suab yuav raug rov qab rau qhov ntsuas. Tus nqi ntawm lub suab uas yuav xav tau thiab yuav kis tau los ntawm lub cev nyob ntawm qhov sib txawv ntawm cov ntaub ntawv 'acoustic impedances. Huab cua thiab siv lead ua muaj qhov sib txawv acoustic impedances. Yog li no, tsis muaj ultrasound yuav xa tawm dhau lub ultrasonic transducer nto.
Sib txuam Txheej
Cov khaubncaws sab nraud povtseg sib txuas yog siv los ua lub suab sib txawv ntawm lub cev thiab lub pob zeb piezoelectric siv lead ua kom tsawg li sai tau. Ob peb txheej no tau muab tso rau hauv nruab nrab ntawm lub tshuab hloov hluav taws xob thiab cov siv lead ua. Lub suab ntas impedances ntawm thawj txheej thiab lub ci ci yuav luag zoo li qub. Cov khaubncaws sab nraud povtseg acoustic impedance yuav luag zoo tib yam li daim tawv nqaij acoustic impedance. Muaj ntau lub suab tau xa mus rau hauv lub cev vim tias cov tswv yim no.
Ultrasonic Gel
Huab cua tsis yog kev coj zoo ntawm lub suab. Thiab yog li, ultrasonic gel siv los tshem tawm cov huab cua ntawm daim tawv nqaij thiab hla dhau. Cov gel tso rau ntawm daim tawv nqaij. Nrog kev pab ntawm ultrasonic gel, lub suab nrov tau yooj yim kis mus rau hauv lub cev.
Kev ntsuas ultrasonic
Cov duab ultrasonic tsim tawm nrog kev pab ntawm ultrasonic transducers thiab ultrasonic suab vuam. Thaum lub suab nthwv dej ntaus cov ntaub so ntswg, lawv tau xav txog. Qhov no hu ua echoing. Lub suab nrov rov qab mus rau qhov uas lawv tuaj ntawm. Lawv dhau los ntawm cov gel, txheej, thiab siv lead ua dua. Thaum cov nthwv dej mus txog qhov siv lead ua, lawv hloov mus rau hauv electro lub zog (hluav taws xob). Lub zog hluav taws xob muaj peev xwm tom qab ntawd ua tiav thiab hloov mus rau hauv cov duab ultrasonic los ntawm lwm cov khoom siv hauv tshuab ultrasonic.
