{"id":60295,"date":"2023-04-21T22:21:09","date_gmt":"2023-04-22T03:21:09","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-generate-ultrasonic-sound\/"},"modified":"2025-01-27T06:08:30","modified_gmt":"2025-01-27T11:08:30","slug":"how-to-generate-ultrasonic-sound","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-to-generate-ultrasonic-sound\/","title":{"rendered":"Generov\u00e1n\u00ed ultrazvuku: metody a praktick\u00e9 n\u00e1vody"},"content":{"rendered":"<p>Ultrazvuk, zvuk s frekvenc\u00ed nad 20 kHz, je lidsk\u00fdm uchem nesly\u0161iteln\u00fd, ale nach\u00e1z\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha oblastech, od l\u00e9ka\u0159stv\u00ed po pr\u016fmysl. Jeho generov\u00e1n\u00ed v\u0161ak nen\u00ed trivi\u00e1ln\u00ed z\u00e1le\u017eitost\u00ed a z\u00e1vis\u00ed na n\u011bkolika kl\u00ed\u010dov\u00fdch faktorech.  Tento \u010dl\u00e1nek se podrobn\u011b zam\u011b\u0159\u00ed na r\u016fzn\u00e9 metody generov\u00e1n\u00ed ultrazvuku.<\/p>\n<p>Piezoelektrick\u00fd jev a jeho vyu\u017eit\u00ed<\/p>\n<p>Nejpou\u017e\u00edvan\u011bj\u0161\u00ed metodou generov\u00e1n\u00ed ultrazvuku je vyu\u017eit\u00ed piezoelektrick\u00e9ho jevu.  Piezoelektrick\u00e9 materi\u00e1ly, jako je k\u0159emen nebo titan\u00e1t barnat\u00fd, m\u011bn\u00ed svou fyzik\u00e1ln\u00ed velikost v reakci na aplikovan\u00e9 elektrick\u00e9 pole.  P\u0159iveden\u00edm st\u0159\u00eddav\u00e9ho nap\u011bt\u00ed vysok\u00e9 frekvence na piezoelektrick\u00fd krystal se dos\u00e1hne jeho periodick\u00e9 deformace, kter\u00e1 generuje ultrazvukov\u00e9 vlny.  Frekvence generovan\u00e9ho ultrazvuku z\u00e1vis\u00ed na vlastnostech krystalu a frekvenci aplikovan\u00e9ho nap\u011bt\u00ed.  V\u00fdkon ultrazvuku je ovlivn\u011bn amplitudou nap\u011bt\u00ed a rozm\u011bry krystalu.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Materi\u00e1l<\/th>\n<th>Frekven\u010dn\u00ed rozsah (kHz)<\/th>\n<th>V\u00fdhody<\/th>\n<th>Nev\u00fdhody<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>K\u0159emen<\/td>\n<td>10 &#8211; 100<\/td>\n<td>Vysok\u00e1 stabilita frekvence, odolnost<\/td>\n<td>N\u00edzk\u00e1 \u00fa\u010dinnost, k\u0159ehkost<\/td>\n<\/tr>\n<tr>\n<td>Titan\u00e1t barnat\u00fd<\/td>\n<td>100 &#8211; 1000<\/td>\n<td>Vysok\u00e1 \u00fa\u010dinnost, snadn\u00e9 zpracov\u00e1n\u00ed<\/td>\n<td>Ni\u017e\u0161\u00ed stabilita frekvence, citlivost na teplotu<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Gener\u00e1tory ultrazvuku s magnetostrik\u010dn\u00edm efektem<\/p>\n<p>Magnetostrik\u010dn\u00ed materi\u00e1ly, jako je nap\u0159\u00edklad nikl, m\u011bn\u00ed sv\u00e9 rozm\u011bry v reakci na aplikovan\u00e9 magnetick\u00e9 pole.  Stejn\u011b jako u piezoelektrick\u00fdch materi\u00e1l\u016f, periodick\u00e1 zm\u011bna magnetick\u00e9ho pole indukuje vibrace, kter\u00e9 generuj\u00ed ultrazvuk.  Tato metoda je m\u00e9n\u011b \u010dast\u00e1 ne\u017e piezoelektrick\u00e1, ale nab\u00edz\u00ed v\u00fdhody v n\u011bkter\u00fdch specializovan\u00fdch aplikac\u00edch, nap\u0159\u00edklad p\u0159i generov\u00e1n\u00ed ultrazvuku s velmi vysok\u00fdm v\u00fdkonem.<\/p>\n<p>Generov\u00e1n\u00ed ultrazvuku pomoc\u00ed elektromagnetick\u00fdch vln<\/p>\n<p>Ultrazvuk lze generovat i p\u0159\u00edmou konverz\u00ed elektromagnetick\u00e9 energie na mechanick\u00e9 vibrace.  Jedn\u00edm z p\u0159\u00edklad\u016f je pou\u017eit\u00ed elektromagnetick\u00fdch transduktor\u016f, kter\u00e9 vyu\u017e\u00edvaj\u00ed interakci magnetick\u00e9ho pole c\u00edvky a vodiv\u00e9ho prvku k generov\u00e1n\u00ed ultrazvukov\u00fdch vibrac\u00ed. Tato metoda je m\u00e9n\u011b roz\u0161\u00ed\u0159en\u00e1 kv\u016fli slo\u017eitosti konstrukce a ni\u017e\u0161\u00ed \u00fa\u010dinnosti ve srovn\u00e1n\u00ed s piezoelektrick\u00fdmi metodami.<\/p>\n<p>Aplikace ultrazvuku<\/p>\n<p>Generov\u00e1n\u00ed ultrazvuku m\u00e1 \u0161irok\u00e9 spektrum aplikac\u00ed. V medic\u00edn\u011b se vyu\u017e\u00edv\u00e1 k diagnostick\u00fdm \u00fa\u010del\u016fm (ultrazvukov\u00e9 zobrazov\u00e1n\u00ed), v pr\u016fmyslu k \u010di\u0161t\u011bn\u00ed, sva\u0159ov\u00e1n\u00ed, a defektoskopii.  V n\u011bkter\u00fdch p\u0159\u00edpadech se pro generov\u00e1n\u00ed ultrazvuku s p\u0159esn\u011b definovan\u00fdmi parametry pou\u017e\u00edvaj\u00ed specializovan\u00e9 syst\u00e9my od firem jako Beijing Ultrasonic, kter\u00e9 disponuj\u00ed technologi\u00ed pro v\u00fdrobu vysoce kvalitn\u00edch ultrazvukov\u00fdch transduktor\u016f.<\/p>\n<p>Ultrazvukov\u00e9 technologie se neust\u00e1le vyv\u00edjej\u00ed a nach\u00e1zej\u00ed st\u00e1le nov\u00e1 uplatn\u011bn\u00ed.  Pokrok v oblasti materi\u00e1l\u016f a elektroniky vede k v\u00fdvoji efektivn\u011bj\u0161\u00edch a spolehliv\u011bj\u0161\u00edch gener\u00e1tor\u016f ultrazvuku s p\u0159esn\u011b definovan\u00fdmi parametry, co\u017e otev\u00edr\u00e1 cestu k dal\u0161\u00edm inovac\u00edm v mnoha oblastech lidsk\u00e9 \u010dinnosti.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ultrazvuk, zvuk s frekvenc\u00ed nad 20 kHz, je lidsk\u00fdm uchem nesly\u0161iteln\u00fd, ale nach\u00e1z\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha oblastech, od l\u00e9ka\u0159stv\u00ed po pr\u016fmysl. Jeho generov\u00e1n\u00ed v\u0161ak nen\u00ed trivi\u00e1ln\u00ed z\u00e1le\u017eitost\u00ed a z\u00e1vis\u00ed na n\u011bkolika kl\u00ed\u010dov\u00fdch faktorech. Tento \u010dl\u00e1nek se podrobn\u011b zam\u011b\u0159\u00ed na r\u016fzn\u00e9 metody generov\u00e1n\u00ed ultrazvuku. Piezoelektrick\u00fd jev a jeho vyu\u017eit\u00ed Nejpou\u017e\u00edvan\u011bj\u0161\u00ed metodou generov\u00e1n\u00ed ultrazvuku je vyu\u017eit\u00ed<\/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-60295","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\/60295","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=60295"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60295\/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=60295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=60295"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=60295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}