{"id":60420,"date":"2023-04-21T22:07:04","date_gmt":"2023-04-22T03:07:04","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-detect-ultrasonic-waves\/"},"modified":"2025-01-27T06:08:11","modified_gmt":"2025-01-27T11:08:11","slug":"how-to-detect-ultrasonic-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-to-detect-ultrasonic-waves\/","title":{"rendered":"Detekce ultrazvuku: metody a techniky"},"content":{"rendered":"<p>Ultrazvukov\u00e9 vlny, s frekvenc\u00ed nad 20 kHz, jsou pro lidsk\u00e9 ucho nesly\u0161iteln\u00e9, ale jejich detekce je kl\u00ed\u010dov\u00e1 v mnoha oblastech, od medic\u00edny po pr\u016fmysl.  Existuje n\u011bkolik metod, jak tyto vlny detekovat, ka\u017ed\u00e1 s vlastn\u00edmi v\u00fdhodami a nev\u00fdhodami.  Pochopen\u00ed princip\u016f detekce je nezbytn\u00e9 pro efektivn\u00ed vyu\u017eit\u00ed ultrazvukov\u00e9 technologie.<\/p>\n<h3>Detekce pomoc\u00ed piezoelektrick\u00fdch transduktor\u016f<\/h3>\n<p>Nejpou\u017e\u00edvan\u011bj\u0161\u00ed metodou detekce ultrazvuku je vyu\u017eit\u00ed piezoelektrick\u00e9ho efektu.  Piezoelektrick\u00e9 materi\u00e1ly, jako je k\u0159emen nebo speci\u00e1ln\u00ed keramika, generuj\u00ed elektrick\u00fd n\u00e1boj, kdy\u017e jsou vystaveny mechanick\u00e9mu nam\u00e1h\u00e1n\u00ed, a naopak.  Ultrazvukov\u00e1 vlna, dopadaj\u00edc\u00ed na piezoelektrick\u00fd transduktor, zp\u016fsob\u00ed jeho vibrace, kter\u00e9 se n\u00e1sledn\u011b p\u0159em\u011bn\u00ed na elektrick\u00fd sign\u00e1l.  S\u00edla tohoto sign\u00e1lu je p\u0159\u00edmo \u00fam\u011brn\u00e1 intenzit\u011b ultrazvukov\u00e9 vlny.  Tento sign\u00e1l je pak zpracov\u00e1n elektronick\u00fdm obvodem, kter\u00fd ho zes\u00edl\u00ed a zpracuje pro dal\u0161\u00ed anal\u00fdzu.  Citlivost a frekven\u010dn\u00ed rozsah detekce z\u00e1vis\u00ed na vlastnostech pou\u017eit\u00e9ho piezoelektrick\u00e9ho materi\u00e1lu a konstrukci transduktoru.<\/p>\n<h3>Detekce pomoc\u00ed mikrof\u00f3n\u016f s vysokou frekven\u010dn\u00ed odezvou<\/h3>\n<p>A\u010dkoli lidsk\u00e9 ucho ultrazvuk nesly\u0161\u00ed, n\u011bkter\u00e9 mikrofony s velmi vysokou frekven\u010dn\u00ed odezvou jsou schopny detekovat i \u010d\u00e1st ultrazvukov\u00e9ho spektra.  Tyto mikrofony v\u0161ak obvykle nemaj\u00ed takovou citlivost jako piezoelektrick\u00e9 transduktory, a proto se pro detekci ultrazvuku pou\u017e\u00edvaj\u00ed m\u00e9n\u011b \u010dasto.  D\u016fle\u017eit\u00e9 je si uv\u011bdomit, \u017ee jejich pou\u017eit\u00ed je omezeno na ni\u017e\u0161\u00ed frekvence ultrazvuku.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Metoda detekce<\/th>\n<th>Citlivost<\/th>\n<th>Frekven\u010dn\u00ed rozsah<\/th>\n<th>Aplikace<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Piezoelektrick\u00e9 transduktory<\/td>\n<td>Vysok\u00e1<\/td>\n<td>\u0160irok\u00fd rozsah<\/td>\n<td>Medic\u00edna, pr\u016fmysl, m\u011b\u0159en\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Mikrofony s vysokou frekven\u010dn\u00ed odezvou<\/td>\n<td>N\u00edzk\u00e1<\/td>\n<td>Omezen\u00fd rozsah<\/td>\n<td>Zjednodu\u0161en\u00e9 aplikace, monitoring<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Optick\u00e1 detekce ultrazvuku<\/h3>\n<p>M\u00e9n\u011b b\u011b\u017en\u00e1, ale st\u00e1le relevantn\u00ed metoda detekce vyu\u017e\u00edv\u00e1 optick\u00fdch jev\u016f.  Jednou z mo\u017enost\u00ed je nap\u0159\u00edklad vyu\u017eit\u00ed Braggova rozptylu sv\u011btla na ultrazvukov\u00fdch vln\u00e1ch.  Ultrazvukov\u00e1 vlna vytv\u00e1\u0159\u00ed v prost\u0159ed\u00ed periodick\u00e9 zm\u011bny hustoty, kter\u00e9 ovliv\u0148uj\u00ed \u0161\u00ed\u0159en\u00ed sv\u011btla.  Detekc\u00ed zm\u011bn v intenzit\u011b a sm\u011bru rozpt\u00fdlen\u00e9ho sv\u011btla je mo\u017en\u00e9 detekovat p\u0159\u00edtomnost a vlastnosti ultrazvukov\u00e9 vlny.  Tato metoda je velmi citliv\u00e1 a umo\u017e\u0148uje p\u0159esn\u00e9 m\u011b\u0159en\u00ed parametr\u016f ultrazvukov\u00fdch vln.  Nicm\u00e9n\u011b, je technicky n\u00e1ro\u010dn\u011bj\u0161\u00ed a dra\u017e\u0161\u00ed ne\u017e pou\u017eit\u00ed piezoelektrick\u00fdch transduktor\u016f.<\/p>\n<h3>Zpracov\u00e1n\u00ed detekovan\u00e9ho sign\u00e1lu<\/h3>\n<p>Bez ohledu na zvolenou metodu detekce je nutn\u00e9 detekovan\u00fd sign\u00e1l d\u00e1le zpracovat.  To zahrnuje zes\u00edlen\u00ed sign\u00e1lu, odstran\u011bn\u00ed \u0161umu, a jeho digitalizaci pro n\u00e1slednou anal\u00fdzu.  Modern\u00ed elektronick\u00e9 syst\u00e9my umo\u017e\u0148uj\u00ed sofistikovan\u00e9 zpracov\u00e1n\u00ed sign\u00e1lu, kter\u00e9 umo\u017e\u0148uje detailn\u00ed anal\u00fdzu parametr\u016f ultrazvukov\u00e9 vlny, jako je frekvence, amplituda a rychlost \u0161\u00ed\u0159en\u00ed.<\/p>\n<p>Detekce ultrazvukov\u00fdch vln je komplexn\u00ed proces, z\u00e1visl\u00fd na specifick\u00fdch po\u017eadavc\u00edch aplikace. Volba vhodn\u00e9 metody a n\u00e1sledn\u00e9 zpracov\u00e1n\u00ed sign\u00e1lu jsou kl\u00ed\u010dov\u00e9 pro z\u00edsk\u00e1n\u00ed spolehliv\u00fdch a p\u0159esn\u00fdch v\u00fdsledk\u016f.  A\u0165 u\u017e se jedn\u00e1 o l\u00e9ka\u0159sk\u00e9 zobrazov\u00e1n\u00ed, pr\u016fmyslovou kontrolu materi\u00e1l\u016f nebo m\u011b\u0159en\u00ed vzd\u00e1lenosti,  pochopen\u00ed princip\u016f detekce ultrazvuku je nezbytn\u00e9 pro efektivn\u00ed vyu\u017eit\u00ed t\u00e9to technologie.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ultrazvukov\u00e9 vlny, s frekvenc\u00ed nad 20 kHz, jsou pro lidsk\u00e9 ucho nesly\u0161iteln\u00e9, ale jejich detekce je kl\u00ed\u010dov\u00e1 v mnoha oblastech, od medic\u00edny po pr\u016fmysl. Existuje n\u011bkolik metod, jak tyto vlny detekovat, ka\u017ed\u00e1 s vlastn\u00edmi v\u00fdhodami a nev\u00fdhodami. Pochopen\u00ed princip\u016f detekce je nezbytn\u00e9 pro efektivn\u00ed vyu\u017eit\u00ed ultrazvukov\u00e9 technologie. Detekce pomoc\u00ed piezoelektrick\u00fdch transduktor\u016f Nejpou\u017e\u00edvan\u011bj\u0161\u00ed metodou detekce ultrazvuku<\/p>\n","protected":false},"author":1,"featured_media":26472,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-60420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60420","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/comments?post=60420"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60420\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/26472"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=60420"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=60420"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=60420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}