Kev kuaj mob ultrasound sojntsuam yog ib feem tseem ceeb ntawm kev kho mob ultrasound ntsuas. Nws lub hauv paus ntsiab lus tseem ceeb yog siv cov kev nthuav tawm thiab kev xav txog cov yam ntxwv ntawm ultrasonic nthwv dej hauv tib neeg cov ntaub so ntswg kom tau txais cov duab los ntawm kev xa thiab tau txais cov haujlwm ntawm kev sojntsuam kom ua tiav kev kuaj mob thiab kev kho mob.
Lub hauv paus ntsiab lus ntawm kev kho mob ultrasound sojntsuam tuaj yeem muab faib ua cov hauv qab no:
1. Piezoelectric effect: Kev kho mob ultrasound probes feem ntau siv cov ntaub ntawv piezoelectric, xws li quartz siv lead ua, ceramics, thiab lwm yam. Thaum lub zog ntawm hluav taws xob, cov ntaub ntawv no tau txais cov nyhuv piezoelectric, uas yog, txhua yam deformation. Siv cov nyhuv no, cov khoom siv piezoelectric tuaj yeem vibrated los ntawm hluav taws xob teb excitation, yog li tsim ultrasonic tsis.
2. Pulse yoj emission: Kev kho mob ultrasound sojntsuam emits ultrasonic tsis los ntawm pulse tsis. Thaum cov khoom zoo siab los ntawm qhov hluav taws xob, nws vibrates mechanically, ua ultrasonic pulses. Cov duab ntawm cov mem tes thiab zaus ntawm kev co nyob ntawm qhov kev sojntsuam tsim thiab tsav voltage.
3. Pulse yoj txais tos: Ntxiv rau kev xa cov ultrasonic tsis, kev kho mob ultrasound probes kuj tau siv kom tau txais kev cuam tshuam ultrasonic. Thaum ultrasound nthwv dej dhau los ntawm cov ntaub so ntswg, lawv raug cuam tshuam thiab tawg rov qab mus rau qhov tau txais cov khoom ntawm kev sojntsuam. Cov khoom tau txais hloov pauv cov tshuab kev vibration rau hauv lub teeb liab them nqi, uas yog tom qab ntawd hloov mus rau hauv cov duab los ntawm lub teeb liab ua Circuit Court.
4. Cov yam ntxwv ntawm lub suab beam: geometry thiab kev npaj ntawm kev xa tawm thiab txais cov ntsiab lus ntawm kev kho mob ultrasound sojntsuam yuav cuam tshuam ncaj qha rau lub suab beam yam ntxwv. Suab Beams hais txog lub zog ntom xa tawm ntawm ultrasonic vuam propagating nyob rau hauv nruab nrab. Kev kho mob ultrasound probes feem ntau siv cov cuab yeej tsom rau kev txhim kho lub peev xwm ntawm lub suab nrov, ua rau cov duab pom tseeb dua.
5. Doppler nyhuv: Kev kho mob ultrasound sojntsuam kuj tseem siv tau cov nyhuv Doppler los ntsuas qhov ceev thiab kev taw qhia ntawm cov kua dej. Thaum ultrasonic nthwv dej ntsib cov dej txav, qhov zaus hloov pauv tshwm sim, uas yog proportional rau cov kua ceev. Los ntawm kev ntsuas qhov loj thiab cov kev taw qhia ntawm kev hloov zaus, cov ntaub ntawv hais txog cov dej txav tau tuaj yeem tau txais.
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Post lub sij hawm: Jan-18-2024
