Xa ultrasound scan of theisisuokanyeizintsozikhankanyiwe, ukubala okanye amatye (afana namatye ezintso kunye nenyongo kumfanekiso ongentla) ahlala edityaniswa kuqala, kodwa amatye anobungakanani obuthelekisekayo anokuba namanqanaba ahlukeneyo esandi kunye nesithunzi.Ngokomzekelo, ukubunjwa okuhlukeneyo kwelitye, okanye impembelelo yokugudiswa kobuso belitye.Kuba ngaba ezi zakhiwo zomzimba ziqinisekisa ubukhulu besandi kunye nesithunzi, okwangoku, siya kuhlalutya ukusebenza kwesandi kunye nesithunzi kwimilo ye-ultrasonic beam ngokwayo.
Okokuqala, isandi kunye nesithunzi sithetha ngokudumileyo, i-ultrasonic beam ekhutshwayo ivaliwe kwindawo yelitye, okubangela ukuba kungabikho ukukhanya kwe-ultrasonic emva kwelitye, kwaye ngokwemvelo izicubu ezikwezi zikhundla azikwazi ukuvelisa i-echoes, ngaloo ndlela zivelisa isandi kunye nesithunzi. .Siyazi ukuba umqadi wokukhutshwa kwe-ultrasonic ngowona ubhityileyo kwindawo ekugxilwe kuyo ukukhutshwa, kwaye umqadi kwindawo engaphandle kogxininiso uya usiba banzi kwaye ubonakale okwesali.Njengesiqhelo, sisasebenzisa umzekeliso womfanekiso we-ultrasound kunye neekhamera.Kanye njengokuba ixabiso lokuvula ilensi yekhamera ye-SLR lincinci (esona simboli sikhulu), kokukhona isisombululo sendawo ekugxilwe kuyo singcono, kwaye kokukhona kuvakala ngakumbi umphambili kunye ne-bokeh yangasemva.Xa ufota izilwanyana ezingaphakathi kwindlwana yentsimbi ngekhamera, ngaba uye waphawula ukuba ikheyiji yentsimbi yaba ngumnatha okhanyayo emfanekisweni?Lo mfanekiso ungezantsi yipere yeenkawu kunye noomama abafotwe ngumbhali ekhejini e-Bangkok Wildlife Park, kwaye ukuba awujongi kakuhle, unokungazihoyi iigridi ezibuthathaka.Kodwa xa siqwalasela ikheyiji yentsimbi, intsimbi emnyama ivalela ngasemva.Abo banomdla banokugoduka kwaye bazame ukuva olu lingelo kwiindawo ezahlukeneyo zokugxila, kanye njengombhali kumfanekiso ongezantsi edubula unodoli ongqinga wentombazana enqumla ifolokhwe.
Masibuyele kwi-imaging ye-ultrasound, ukwenzela ukuba sifunde ngobungakanani le ngxaki, sisebenzisa i-ultrasonic body molds (KS107BG) elinganisa ukungena kunye nesisombululo ukubonisa isenzeko sesandi kunye nesithunzi, injongo yalo mzekelo womzimba ngumgca omncinci ongekho. transparent, enokulinganisa kakuhle isiphumo sesithunzi sesandi.Ukubonisa ngcono umphumo wokuvala, sisebenzisa i-high-frequency probe kunye ne-center frequency of8.5MHz, ngenxa yokuba i-high-frequency probe inokufumana i-finer ultrasonic beam (ngoko ke kulula ukufumana isisombululo esiphezulu se-lateral).
Okokuqala, sihlengahlengisa ugxininiso lwe-emission kubunzulu be-1cm, sinokubona ithagethi kwindawo ye-1cm iyona ecacileyo, kwaye indawo emnyama encinci ingabonwa ngokukhawuleza emva kwethagethi malunga ne-5mm, kodwa i-target engaphantsi kwe-1cm. irhuqwa ngumjelo omde omnyama, obizwa ngokuba sisandi nesithunzi.Ummandla ongaphakathi kwe-1cm ufana nomphambili wokufota, kunye nobunzulu obugxilwe kwi-1cm kunye nommandla ongasemva emva kwe-1cm.Ngokucacileyo, i-foreground target ngaphakathi kwe-1cm ifana nekheji kwifoto yenkawu ngoku, kwaye xa sigxininisa kubunzulu be-1cm, kubonakala ngathi i-ultrasound iyakwazi ukudlula kwaye iqhubeke nokuhambisa amandla phambili phantse ingachaphazeleki.Nangona kunjalo, indawo engaphantsi kogxininiso ayikwazi ukuvalelwa malunga nethagethi, okubangela ukuba phantse akukho nkxaso yamandla e-ultrasonic emva kwethagethi, ngoko kungabikho i-echo.Ukuze siqinisekise ngcono i-hypothesis yethu, sifanise imiqadi ye-ultrasonic egxininise ngeli xesha, kwaye i-wavefronts yamaza e-ultrasonic pulse ngamaxesha ahlukeneyo aboniswa kulo mfanekiso ulandelayo.
Kuyabonakala ukuba, kubunzulu be-1 cm, amandla ogxininiso lwe-emission agxininiswe, okubangela umqadi obhityileyo, kwaye ububanzi bomqadi buyanda ngokuthe ngcembe njengoko busuka kubunzulu bengqwalasela.Xa ubunzulu bethagethi bungaphantsi kwe-1cm, ithagethi ifihla inxalenye yamandla, kodwa ubukhulu bethagethi buncinci, kwaye amandla angavalwanga kwicala aya kuqhubeka enyuka ukuya kwindawo ekugxilwe kuyo. isandi kunye nesithunzi sezi thagethi ziya kuba buthathaka kakhulu, kwaye ngokusondeleyo kumphezulu weprobe, isandi esicacileyo kunye nesithunzi siya kuba.Xa indawo ekujoliswe kuyo isezantsi ekugxininiseni, i-ultrasonic beam ngokwayo incinci kakhulu, ngoko ke amandla ekujoliswe kuwo anokuthintela makhulu, okubangela ukuba amandla amancinci akwazi ukuqhubeka ejikeleze ithagethi, eyenza kwakhona indawo leyo. emva kobu bunzulu buvelisa indawo emnyama yokwenene.Kufana nokuba ugxininise kwi-cage, kwaye indawo emva kwegridi ye-cage ivaliwe ngokupheleleyo.
Kwenzeka ntoni xa ithagethi isemva kwendawo ekugxilwe kuyo (indawo engasemva)?Abanye abantu baya kuthi i-beam yesandi nayo ibanzi kakhulu, kwaye ithagethi inokugubungela inxalenye yayo kuphela, ngaba iya kufana nendawo engaphambili, ngaba amandla angadlula ekujoliswe kuyo ukunciphisa isandi nesithunzi?Impendulo ngokucacileyo ayikho, njengokuba iithagethi kumqolo we-oblique osekhohlo kumfanekiso ongentla zizonke emva kobunzulu be-1cm, kwaye isandi kunye nomthunzi owenziweyo awukho ngaphantsi kweethagethi kwi-1cm isikhundla.Ngeli xesha, siqwalasela ngokucophelela imilo ye-ultrasonic beam, kunye ne-wavefront ye-beam ngaphambi nangemva kokugxila akusicaba, kodwa kufana ne-arc shape egxile ekugxininiseni.Umqadi okufutshane nomphezulu weprobe udibana ukuya kwindawo ekugxilwe kuyo, ngelixa uluhlu lwamaza bunzulu kunendawo ekugxilwe kuyo lusasazeke ngaphandle kunye nendawo ekugxilwe kuyo.Oko kukuthi, xa ithagethi ikwindawo engaphambili xa isandi esingasithelwanga yithagethi siya kuqhubeka sisasaza kwicala ekugxilwe kulo, kunye nesandi esingasithelwanga yithagethi kwindawo yangasemva. iya kuqhubeka isasaza kwicala lokutenxa kumgca wokuskena, sifumana kuphela umqondiso we-echo kumgca wokuskena, ngoko ke amandla atenxayo kumgca wokuskena akakwazi ukufunyanwa, ngoko ke isandi kunye nesithunzi zenziwe.
Xa sihlengahlengisa ukugxilwa kokuqaliswa kwi-1.5cm enzulu, isandi kunye nesithunzi emva kwethagethi kwi-1cm ye-1cm nayo yancitshiswa kakhulu, kodwa i-target emva kwe-1.5cm yayisarhuqa umsila omnyama omde.Ngezantsi isicwangciso se-boam sokukhutshwa kwe-ultrasonic, Masizame ukuhlalutya isiganeko sesandi kunye nesithunzi ngokudibanisa ne-morphology ye-beam.
Xa ubunzulu bengqwalasela buyanda ngakumbi ukuya kwi-2cm, isandi kunye nesithunzi emva kwethagethi ngaphakathi kwe-2cm zibuthathaka kakhulu.Umzobo ongezantsi uhambelana ne-ultrasonic emission beam plot.
Umfanekiso womzekelo wangaphambili kuphela ubunzulu bogxininiso obuhlengahlengisiweyo, kwaye iimeko kwezinye iindawo zokujongana zihlala zingatshintshi, kodwa xa kulungiswa ubunzulu bojoliso, imvelaphi ikwathetha imeko, oko kukuthi, njengoko ubunzulu bogxininiso lokukhutshwa buba nzulu ngakumbi. umngxuma ophumayo nawo uya kwanda (inani elingaphambili kwisihloko somzobo weplanga bubunzulu bojoliso, kwaye inani elingemva linani lee elementi zoluhlu oluhambelana ne-emission aperture), kwaye ngokuqwalasela ububanzi bomqadi weprobe. umphezulu, sinokufumana inguqu yokwenyani yokuphuma komsintsi.Ngokubanzi, indawo yokuvula yogxininiso lokukhutshwayo ilingana nobunzulu bengqwalasela, kanye njengelensi yokwandisa enembombo engaguqukiyo.
Ngoko ke yintoni umphumo kwisandi kunye nesithunzi xa ubunzulu obugxilwe obufanayo kunye nobukhulu bokuvula bohlukile?Ukuthatha ugxininiso olufanayo lwe-1.5cm yobunzulu njengomzekelo, ngokulungelelanisa iiparitha zangaphakathi zomatshini, ubungakanani be-aperture yokukhutshwa buphindwe kabini.
Bekufanele ukuba sifunde ukuhlalutya isenzeko sesandi ekujoliswe kuso kunye nesithunzi ngokusebenzisa imephu ye-beam ngokusebenzisa lo mzekelo ungasentla, ngoko sinokujonga ngokuthe ngqo kwi-beamogram yalo mzekelo.Njengoko indawo yokuvula iya isiba ncinane, umqadi wobunzulu bojoliso uyandiswa, kodwa ukugoba kwesali kuba ncinane.I-warping ye-foreground efanayo kunye ne-background beams iba yinto engabonakaliyo, kwaye ukujonga indlela i-wavefront curves ejikeleze ngayo, kunokubonwa ukuba amandla e-ultrasonic afana nenqwelomoya ehambelana nomphezulu weprobe eqhubela phambili.Ke ngoko, isiphumo esibi kukuba nangona amandla e-ultrasonic kwindawo engaphambili ivalwe ngokuyinxenye yithagethi, isenokuthi iqhubeke isasaza ijikeleze ithagethi ngokubhekiselele kwindawo ekugxilwe kuyo, kodwa xa i-aperture encinci incinci, ububanzi bendawo yangaphambili. umqadi ucuthelwe kuqala, umlinganiselo wamandla ovaliweyo uyanyuswa, kwaye amaza omsindo ecaleni awahlangani ngokubhekiselele kwindawo ekugxilwe kuyo, ngoko ke nangona amandla e-ultrasonic angafihlwanga eqhubeka ekusasaza phambili, phantse awanagalelo. kwi-echo yendawo yomgca wokuskena, okukhokelela ekunciphiseni indawo yokuvula.Nokuba isandi kunye nesithunzi sethagethi kwindawo engaphambili kuya kubonakala ngakumbi.Kanye njengaxa sithatha umfanekiso wentaka evalelwe ngefowuni ephathwayo ngaphaya kwekheji, nokuba ingakanani na indawo yokuvula yamabango efowuni ephathwayo, iya kushiya igridi emnyama ebonakalayo yekheji kwifoto, kuba eyona ndawo yokuvula i-aperture. ikhamera yeselula incinci kakhulu.
Ngaphambili, senze kuphela uhlalutyo lovavanyo malunga nesikhundla sogxininiso lokukhutshwa kunye nobukhulu bendawo yokukhutshwa kwisandi kunye nesithunzi, kudityaniswe ne-ultrasonic scanning, ukwenzela ukuskena kwamatye amancinci, ukuze ufumane isandi esingcono kunye nesithunzi. iziphumo, ngokuqhelekileyo akunakwenzeka ukutshintsha ubungakanani bembobo, kodwa kunokwenzeka ukuba kuthathelwe ingqalelo indawo ekugxilwe kuyo ngokusondeleyo kangangoko kunokwenzeka phambi kwelitye.Okanye xa isandi nesithunzi zingabonakali, oko akuthethi ukuba amatye mancinane kakhulu, okanye kungenxa yokuba into ekugxininiswa kuyo ayikho kwindawo efanelekileyo.Ukongeza, njengoko kukhankanyiwe ekuqaleni, kunokubakho izinto ezininzi eziphembelela amandla esandi kunye nesithunzi, njengeyona ndawo ichanekileyo ubukhulu belitye, ukongeza, isandi esisisiseko kunye nesithunzi sihlala sibuthathaka kakhulu kunesandi se-harmonic. kunye nesithunzi, njalo njalo, ngoko ayinakwenziwa ngokubanzi.
Ngoko khetha iimveliso ze-ultrasound, umgangatho wayo wokucinga ngowona ubalulekileyo, umfanekiso omhle we-harmonic uya kwenza umsebenzi wakho wonyango ube kumgangatho ophezulu, wamkelekile ukubonisana nawe malunga neemveliso ze-ultrasound onomdla kuzo kunye nezinye izixhobo zonyango.
Uvuyo yu
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Ixesha lokuposa: Nov-21-2022
