Ultrasound yog hais txog lub tshuab hluav taws xob (ntau zaus> 20 kHz) uas tshaj qhov hnov ntxhiab ntawm tib neeg pob ntseg, thiab hom zaus ntau dua (ntau zaus> 100 kHz) hu ua high-frequency ultrasound. Qhov zaus ntawm cov khoom siv ultrasonic tam sim no feem ntau nyob rau hauv thaj tsam ntawm 20 kHz txog 10 MHz. Raws li kev ua zaub mov zoo tshaj plaws, ultrasound muaj cov yam ntxwv ntawm kev ua me me thiab muaj zog pertinence. Nws yog dav siv hauv cov zaub mov thiab lwm yam kev lag luam thiab muaj kev loj hlob zoo.
Raws li qhov zaus thiab lub zog ntawm ultrasonic nthwv dej, ultrasonic tsis tuaj yeem muab faib ua ob pawg: high-power low-frequency ultrasonic waves thiab low-power high-frequency ultrasonic waves. Ntawm lawv, high-power low-frequency ultrasound (ntau zaus ntawm 20 thiab 100 kHz) kuj hu ua lub hwj chim ultrasound, uas muaj ntau yam kev siv hauv kev ua zaub mov, xws li kev txhawb nqa emulsification, rhuav tshem cov hlwb, kom tsis muaj menyuam thiab tua enzyme, softening nqaij thiab tshuaj hloov pauv, thiab lwm yam. Low-power high-frequency ultrasound (nws zaus yog feem ntau yog concentrated nyob rau hauv 100 kHz mus rau 10 MHz) tsis yog tsuas yog siv nyob rau hauv kev kho mob kev kuaj mob, tab sis kuj lug siv nyob rau hauv kev tsom xam thiab saib xyuas cov zaub mov lub cev thiab tshuaj zog, xws li hardness, maturity, qab zib, acidity, thiab lwm yam.
High-frequency ultrasonic tsis muaj cov tshuaj sib txawv thiab lub cev los ntawm cov tsis tshua muaj zaus ultrasonic tsis, thiab muaj peev xwm tsim tau ib tug loj npaum li cas ntawm active dawb radicals, yog li ua rau degradation thiab hloov ntawm polymers. Thaum ultrasonic tsis yog siv rau oxidation cov tshuaj tiv thaiv nyob rau hauv ib tug aqueous tov, high-frequency ultrasonic tsis muaj zog npaum li cas tsawg zaus ultrasonic tsis. Nyob rau hauv tej yam kev mob, raws li qhov zaus nce, qhov sib piv ntawm qhov tseeb ultrasonic hwj chim rau lub input zog nce, uas yog, lub conversion efficiency nce, thiab high-frequency ultrasound yuav ua tau ib tug ntau dua sonochemical efficiency.
Siv cov cuab yeej no ntawm high-frequency ultrasound tuaj yeem degrade qee yam khoom tsis zoo hauv cov khoom noj khoom haus khib nyiab lossis ntim khoom. Ib tug loj tus naj npawb ntawm cov dawb radicals uas tsim los ntawm high-frequency ultrasound tuaj yeem hnov mob nrog cov khoom xyaw oxidized yooj yim, thiab rau qee yam tuaj yeem txhim kho cov khoom ua haujlwm ntawm qee yam khoom xyaw.
