Qhov sib txawv tseem ceeb ntawm wavefront thiab wavelet yog qhov wavefront yog qhov chaw ntawm tag nrho cov ntsiab lus uas tau koom ua ke nrog tib theem, kab, lossis nkhaus hauv 2D nruab nrab, whereas wavelet yog nthwv dej zoo li oscillation muaj qhov amplitude uas yog nthuav thiab cog lus maj mam thiab sequentially.
Txawm hais tias cov ntsiab lus wavefront thiab wavelet suab zoo ib yam, lawv yog ob nqe lus sib txawv uas muaj kev siv sib txawv hauv physics.
Wavefront yog dab tsi?
Wavefront yog cov txheej txheem ntawm txhua lub ntsiab lus uas nthwv dej muaj tib theem ntawm sinusoid. Lo lus no tau piav qhia txog lub wavefront ntawm lub sijhawm sib txawv. Yog li, lo lus no feem ntau muaj txiaj ntsig tsuas yog nrog cov teb uas sib txawv sinusoidally hauv lub sijhawm nrog ib ntus zaus ntawm txhua qhov chaw ntawm thaj chaw. Hauv lwm lo lus, wavefronts feem ntau txav nrog lub sijhawm, thiab wavefronts feem ntau yog ib qho ntsiab lus rau nthwv dej uas nthuav tawm hauv qhov nruab nrab tsis sib xws. Hauv 2D nruab nrab, lawv yog nkhaus, thaum nyob hauv 3D nruab nrab, lawv yog qhov chaw.
Daim duab 01: Kev Ua Haujlwm ntawm Lub Lens
Thaum xav txog lub dav hlau sinusoidal yoj, lub wavefronts tuaj yeem txhais tau tias yog cov dav hlau uas nyob ib sab mus rau qhov kev taw qhia ntawm kev nthuav tawm uas nyiam txav mus rau qhov kev taw qhia nrog rau nthwv dej. Nyob rau hauv ib tug sinusoidal spherical yoj, lub wavefronts yog spherical nto uas nyiam nthuav nrog nthwv dej. Ntxiv mus, yog tias qhov ceev ntawm kev nthuav tawm ntawm lub wavefront txawv ntawm cov ntsiab lus sib txawv, ces cov duab thiab kev taw qhia ntawm lub wavefronts tuaj yeem hloov pauv los ntawm refraction. Piv txwv li, lo ntsiab muag tuaj yeem hloov cov duab ntawm qhov muag wavefronts los ntawm cov phiaj xwm mus rau kheej kheej (lossis qee zaum rov ua dua).
Wavelet yog dab tsi?
Wavelets yog nthwv dej zoo li oscillations muaj qhov amplitude uas pib ntawm xoom, maj mam nce thiab qis rov qab mus rau xoom. Feem ntau, peb tuaj yeem pom nws raws li qhov luv luv oscillation zoo ib yam li oscillations kaw los ntawm seismograph lossis lub ntsuas kub.
Daim duab 02: Seismic Wavelet
Tsis tas li ntawd, lub wavelet tuaj yeem tsim kom muaj qhov zaus uas yog Middle C thiab muaj sijhawm luv ntawm li 1/10 thntawm ib thib ob. Yog tias peb tuaj yeem sib koom ua ke lub wavelet no nrog lub teeb liab uas tau tsim los ntawm cov suab paj nruag, qhov no ua rau lub teeb liab uas muaj txiaj ntsig zoo rau kev txiav txim siab thaum nruab nrab C ceeb toom raug ntaus thaum lub suab nkauj. Qhov kev sib raug zoo no yog kev siv tswv yim ntawm wavelet theory.
Txoj kev xav wavelet tuaj yeem siv tau rau ntau yam kev kawm vim tias kev hloov pauv ntawm wavelets tshwm sim raws li cov qauv ntawm lub sijhawm-zaus sawv cev rau cov cim qhia, thiab lawv kuj muaj feem xyuam nrog kev tsom xam.
Muaj ntau hom wavelets, suav nrog cov wavelet discrete (xws li Beylkin, Coiflet, Haar wavelet, Symlet, thiab lwm yam) thiab tsis tu ncua wavelets (xws li beta wavelet, Meyer wavelet, Mexican kaus mom wavelet, Spline wavelet, thiab lwm yam).)
Qhov txawv ntawm Wavefront thiab Wavelet yog dab tsi?
Txawm hais tias cov ntsiab lus wavefront thiab wavelet suab zoo ib yam, lawv yog ob nqe lus sib txawv uas muaj kev siv sib txawv hauv physics. Qhov sib txawv tseem ceeb ntawm wavefront thiab wavelet yog tias wavefront yog qhov chaw ntawm tag nrho cov ntsiab lus uas tau koom ua ke nrog tib theem, ib txoj kab lossis nkhaus hauv 2D nruab nrab, whereas lub wavelet yog nthwv dej zoo li oscillation muaj qhov amplitude uas yog. expanding thiab cog lus maj mam thiab sequentially.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm wavefront thiab wavelet.
Summary – Wavefront vs Wavelet
Wavefront yog cov txheej txheem ntawm txhua lub ntsiab lus uas nthwv dej muaj tib theem ntawm sinusoid. Wavelets yog nthwv dej zoo li oscillations muaj qhov amplitude uas pib ntawm xoom, maj mam nce thiab qis rov qab mus rau xoom. Qhov sib txawv tseem ceeb ntawm wavefront thiab wavelet yog tias wavefront yog qhov chaw ntawm tag nrho cov ntsiab lus uas tau koom ua ke nrog tib theem, ib txoj kab los yog nkhaus hauv 2D nruab nrab, whereas lub wavelet yog ib lub nthwv dej zoo li oscillation muaj lub amplitude uas nthuav dav. thiab cog lus maj mam thiab ua ntu zus.
