Lub suab attenuation txhais li cas?
Lub suab attenuation txhais li cas?

Video: Lub suab attenuation txhais li cas?

Video: Lub suab attenuation txhais li cas?
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Acoustic attenuation yog ib qho kev ntsuas ntawm lub zog poob ntawm suab kev tshaj tawm hauv xov xwm. Thaum twg suab propagates nyob rau hauv xws li xov xwm, muaj ib txwm thermal noj ntawm lub zog tshwm sim los ntawm viscosity.

Ntawm no, lub suab attenuation ntsuas li cas?

Cov units attenuation Tus nqi hauv Nepers ib 'meter' (Np / m) tuaj yeem hloov mus rau decibels / ntev los ntawm kev faib los ntawm 0.1151. Decibels yog ib chav tsev ntau dua thaum hais txog qhov amplitudes ntawm ob lub cim. Attenuation yog feem ntau proportional rau lub square ntawm suab zaus.

Ib sab saum toj, dab tsi ua rau attenuation hauv ultrasound? ua al. Lub amplitude thiab kev siv ntawm ultrasound nthwv dej txo qis thaum lawv mus los ntawm cov ntaub so ntswg, ib qho tshwm sim hu ua attenuation . Muab ib tug ruaj propagation nrug, attenuation cuam tshuam cov zaus ultrasound nthwv dej mus rau ntau dua li cov zaus tsis tshua muaj zog.

Tsis tas li ntawd, koj txhais li cas los ntawm attenuation?

Attenuation yog ib lo lus dav dav uas hais txog kev txo qis ntawm lub zog ntawm lub teeb liab. Attenuation tshwm sim nrog txhua hom teeb liab, txawm tias digital lossis analog. Qee lub sij hawm hu ua poob, attenuation yog ib qho tshwm sim ntawm lub teeb liab kis mus rau qhov ntev.

Qhov zaus cuam tshuam li cas attenuation?

1 Teb. Qhov loj tshaj nyhuv ua rau attenuation yog lub viscosity ntawm huab cua. Qhov loj ntawm cov viscous rog nyob ntawm qhov kev hloov pauv ntawm huab cua tshaj tawm nrog txoj haujlwm. Yog tias zaus ntawm ib lub suab yog doubled, lub wavelength yog halved.

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