Video: Yuav ua li cas txiav txim siab qhov ceev ntawm ib qho ultrasound beam?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv lwm lo lus, wavelength tsuas yog qhov piv ntawm ceev mus rau zaus los yog cov khoom ntawm ceev thiab lub sijhawm. Qhov no txhais tau hais tias lub wavelength ntawm ultrasound yog txiav txim siab los ntawm cov yam ntxwv ntawm ob qho tib si transducer (ntau zaus) thiab cov khoom siv uas lub suab dhau mus ( ceev ).
Nyob rau hauv kev hwm rau qhov no, yuav ua li cas ultrasound ceev xam?
Cov ceev thaum lub suab yoj mus los ntawm ib qho nruab nrab hu ua propagation ceev los yog ceev. Nws yog sib npaug rau zaus zaus lub wavelength. Hauv ultrasound Nws yog ntsuas hauv meters ib ob (m / s) lossis millimeters ib microsecond (mm / µ s).
Ib tug kuj yuav nug, dab tsi yog mem tes ntev hauv ultrasound? Spatial mem tes ntev : Ntev ntawm a mem tes pem hauv ntej mus rau nram qab = ntev ntawm txhua lub voj voog lub sij hawm tus naj npawb ntawm cov voj voog nyob rau hauv mem tes . luv dua mem tes ntev txhim kho kev daws teeb meem. Amplitude, kev siv zog. Indicators ntawm yuav ua li cas muaj zog los yog khaus lub ultrasound yog.
Dab tsi yog ultrasound beam dav?
Nyob rau hauv lub transducer, nqaj dav yog kwv yees sib npaug rau cov dav ntawm lub transducer. Ces, lub nqaj converges rau nws qhov nqaim tshaj plaws dav uas yog ib nrab ntawm dav ntawm lub transducer, ntawm ib tug perpendicular nrug ntawm lub transducer hu ua lub ze-zone length (Fig. 2 a).
Yuav ua li cas txiav txim qhov pib amplitude ntawm ib tug ultrasound yoj?
A. cov pib zog or amplitude ntawm ib lub suab yoj yog txiav txim siab los ntawm kev vibration ntawm piezoelectric siv lead ua nyob rau hauv lub transducer. Qhov ntau dua qhov kev vibration ntawm cov siv lead ua, qhov loj dua amplitude ntawm peb yoj.
Pom zoo:
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