{"id":56731,"date":"2024-04-11T11:19:04","date_gmt":"2024-04-11T16:19:04","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/from-electricity-to-sound-how-ultrasonic-generators-produce-high-frequency-vibrations\/"},"modified":"2025-01-27T06:04:56","modified_gmt":"2025-01-27T11:04:56","slug":"from-electricity-to-sound-how-ultrasonic-generators-produce-high-frequency-vibrations","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/from-electricity-to-sound-how-ultrasonic-generators-produce-high-frequency-vibrations\/","title":{"rendered":"Ultrazvukov\u00e9 gener\u00e1tory: Od elekt\u0159iny k vibrac\u00edm"},"content":{"rendered":"<p>Elekt\u0159ina je v\u0161udyp\u0159\u00edtomn\u00e1 a v mnoha p\u0159\u00edpadech neviditeln\u00e1 s\u00edla, kter\u00e1 poh\u00e1n\u00ed n\u00e1\u0161 modern\u00ed sv\u011bt.  M\u00e9n\u011b zn\u00e1m\u00e9 je, jak se tato energie efektivn\u011b p\u0159em\u011bn\u00ed na mechanick\u00e9 vibrace, konkr\u00e9tn\u011b na ultrazvukov\u00e9 frekvence.  Tento proces je z\u00e1kladem fungov\u00e1n\u00ed ultrazvukov\u00fdch gener\u00e1tor\u016f, kter\u00e9 nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v medic\u00edn\u011b, pr\u016fmyslu i v\u011bdeck\u00e9m v\u00fdzkumu.  Poj\u010fme se detailn\u011bji pod\u00edvat na cestu od elektrick\u00e9ho proudu k vysokofrekven\u010dn\u00edm vibrac\u00edm.<\/p>\n<p>P\u0159em\u011bna elektrick\u00e9 energie na mechanick\u00e9 vibrace: Piezoelektrick\u00fd jev<\/p>\n<p>Z\u00e1kladn\u00edm principem v\u011bt\u0161iny ultrazvukov\u00fdch gener\u00e1tor\u016f je piezoelektrick\u00fd jev.  Tento jev popisuje schopnost n\u011bkter\u00fdch krystalick\u00fdch materi\u00e1l\u016f, jako je nap\u0159\u00edklad k\u0159emen nebo titan\u00e1t barnat\u00fd, m\u011bnit sv\u00e9 rozm\u011bry v z\u00e1vislosti na aplikovan\u00e9m elektrick\u00e9m poli.  Kdy\u017e se na piezoelektrick\u00fd materi\u00e1l p\u0159ivede st\u0159\u00eddav\u00e9 nap\u011bt\u00ed o vysok\u00e9 frekvenci (ultrazvukov\u00e9 frekvence se pohybuj\u00ed v rozmez\u00ed od 20 kHz do n\u011bkolika GHz), doch\u00e1z\u00ed k periodick\u00e9mu rozp\u00edn\u00e1n\u00ed a smr\u0161\u0165ov\u00e1n\u00ed krystalu.  Tato periodick\u00e1 deformace generuje mechanick\u00e9 vibrace o stejn\u00e9 frekvenci jako aplikovan\u00e9 nap\u011bt\u00ed.  Intenzita vibrac\u00ed z\u00e1vis\u00ed na amplitud\u011b aplikovan\u00e9ho nap\u011bt\u00ed a vlastnostech piezoelektrick\u00e9ho materi\u00e1lu.<\/p>\n<p>Typy ultrazvukov\u00fdch gener\u00e1tor\u016f a jejich konstrukce<\/p>\n<p>Existuje n\u011bkolik typ\u016f ultrazvukov\u00fdch gener\u00e1tor\u016f, kter\u00e9 se li\u0161\u00ed v konstrukci a zp\u016fsobu generov\u00e1n\u00ed vibrac\u00ed.  Nej\u010dast\u011bji se pou\u017e\u00edvaj\u00ed piezoelektrick\u00e9 p\u0159evodn\u00edky, kter\u00e9 mohou b\u00fdt uspo\u0159\u00e1d\u00e1ny do r\u016fzn\u00fdch konfigurac\u00ed, nap\u0159\u00edklad jako samostatn\u00e9 prvky nebo jako sou\u010d\u00e1st slo\u017eit\u011bj\u0161\u00edch syst\u00e9m\u016f.  D\u016fle\u017eit\u00fdm faktorem je i rezonan\u010dn\u00ed frekvence p\u0159evodn\u00edku, kter\u00e1 ur\u010duje optim\u00e1ln\u00ed frekvenci pro generov\u00e1n\u00ed ultrazvuku.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Typ gener\u00e1toru<\/th>\n<th>Materi\u00e1l<\/th>\n<th>Frekven\u010dn\u00ed rozsah (kHz)<\/th>\n<th>Aplikace<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Piezoelektrick\u00fd<\/td>\n<td>Titan\u00e1t barnat\u00fd<\/td>\n<td>20 &#8211; 1000<\/td>\n<td>\u010ci\u0161t\u011bn\u00ed, ultrazvukov\u00e9 sva\u0159ov\u00e1n\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Piezoelektrick\u00fd<\/td>\n<td>K\u0159emen<\/td>\n<td>1000 &#8211; 10000<\/td>\n<td>L\u00e9ka\u0159sk\u00e9 zobrazov\u00e1n\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Magnetostrik\u010dn\u00ed<\/td>\n<td>Nikl<\/td>\n<td>20 &#8211; 200<\/td>\n<td>Sonary, ultrazvukov\u00e9 senzory<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Vliv parametr\u016f na generovan\u00fd ultrazvuk<\/p>\n<p>Frekvence a amplituda generovan\u00fdch vibrac\u00ed jsou ovlivn\u011bny n\u011bkolika faktory.  Kl\u00ed\u010dov\u00fdm faktorem je frekvence aplikovan\u00e9ho nap\u011bt\u00ed.  D\u00e1le hraje roli typ a geometrick\u00e9 uspo\u0159\u00e1d\u00e1n\u00ed piezoelektrick\u00e9ho materi\u00e1lu, jeho vlastnosti a kvalita.  V\u00fdznamn\u00fd vliv m\u00e1 tak\u00e9 konstrukce cel\u00e9ho gener\u00e1toru, v\u010detn\u011b jeho mechanick\u00e9 impedance a impedance z\u00e1t\u011b\u017ee.  Optim\u00e1ln\u00ed nastaven\u00ed t\u011bchto parametr\u016f je nezbytn\u00e9 pro dosa\u017een\u00ed po\u017eadovan\u00fdch charakteristik ultrazvuku.  Nap\u0159\u00edklad pro l\u00e9ka\u0159sk\u00e9 zobrazov\u00e1n\u00ed je nutn\u00e9 p\u0159esn\u00e9 \u0159\u00edzen\u00ed frekvence a amplitudy, zat\u00edmco pro ultrazvukov\u00e9 \u010di\u0161t\u011bn\u00ed m\u016f\u017ee b\u00fdt m\u00e9n\u011b kritick\u00e9.<\/p>\n<p>\u0158\u00edzen\u00ed a zesilov\u00e1n\u00ed ultrazvukov\u00fdch vibrac\u00ed<\/p>\n<p>Pro efektivn\u00ed generov\u00e1n\u00ed a \u0159\u00edzen\u00ed ultrazvuku je nezbytn\u00e9 pou\u017eit\u00ed vhodn\u00fdch elektronick\u00fdch obvod\u016f.  Tyto obvody generuj\u00ed vysokofrekven\u010dn\u00ed nap\u011bt\u00ed pot\u0159ebn\u00e9 pro excitaci piezoelektrick\u00e9ho materi\u00e1lu a z\u00e1rove\u0148 umo\u017e\u0148uj\u00ed regulaci amplitudy a frekvence vibrac\u00ed.  V n\u011bkter\u00fdch aplikac\u00edch je nutn\u00e9 zes\u00edlen\u00ed ultrazvukov\u00e9ho sign\u00e1lu, k \u010demu\u017e se pou\u017e\u00edvaj\u00ed speci\u00e1ln\u00ed zesilova\u010de.  Precizn\u00ed \u0159\u00edzen\u00ed je kl\u00ed\u010dov\u00e9 pro dosa\u017een\u00ed po\u017eadovan\u00fdch vlastnost\u00ed ultrazvukov\u00e9ho pole.<\/p>\n<p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee p\u0159em\u011bna elektrick\u00e9 energie na vysokofrekven\u010dn\u00ed mechanick\u00e9 vibrace v ultrazvukov\u00fdch gener\u00e1torech je zalo\u017eena na piezoelektrick\u00e9m jevu.  Tento proces je ovlivn\u011bn \u0159adou faktor\u016f, jejich\u017e optimalizace je kl\u00ed\u010dov\u00e1 pro dosa\u017een\u00ed po\u017eadovan\u00fdch vlastnost\u00ed ultrazvuku.  Ultrazvukov\u00e9 gener\u00e1tory nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v r\u016fzn\u00fdch oblastech lidsk\u00e9 \u010dinnosti, kde jejich jedine\u010dn\u00e9 vlastnosti umo\u017e\u0148uj\u00ed \u0159e\u0161en\u00ed mnoha technologick\u00fdch v\u00fdzev.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Elekt\u0159ina je v\u0161udyp\u0159\u00edtomn\u00e1 a v mnoha p\u0159\u00edpadech neviditeln\u00e1 s\u00edla, kter\u00e1 poh\u00e1n\u00ed n\u00e1\u0161 modern\u00ed sv\u011bt. M\u00e9n\u011b zn\u00e1m\u00e9 je, jak se tato energie efektivn\u011b p\u0159em\u011bn\u00ed na mechanick\u00e9 vibrace, konkr\u00e9tn\u011b na ultrazvukov\u00e9 frekvence. Tento proces je z\u00e1kladem fungov\u00e1n\u00ed ultrazvukov\u00fdch gener\u00e1tor\u016f, kter\u00e9 nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v medic\u00edn\u011b, pr\u016fmyslu i v\u011bdeck\u00e9m v\u00fdzkumu. Poj\u010fme se detailn\u011bji pod\u00edvat na cestu od elektrick\u00e9ho<\/p>\n","protected":false},"author":1,"featured_media":24649,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-56731","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\/56731","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=56731"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/56731\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/24649"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=56731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=56731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=56731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}