{"id":60836,"date":"2023-04-21T15:12:57","date_gmt":"2023-04-21T20:12:57","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-block-ultrasonic-waves\/"},"modified":"2025-01-27T06:06:57","modified_gmt":"2025-01-27T11:06:57","slug":"how-to-block-ultrasonic-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-to-block-ultrasonic-waves\/","title":{"rendered":"\u00da\u010dinn\u00e1 blokace ultrazvukov\u00fdch vln: Praktick\u00fd n\u00e1vod"},"content":{"rendered":"<p>Ultrazvukov\u00e9 vlny, neviditeln\u00e9 a nesly\u0161iteln\u00e9, se v dne\u0161n\u00ed dob\u011b vyu\u017e\u00edvaj\u00ed v \u0161irok\u00e9 \u0161k\u00e1le aplikac\u00ed, od l\u00e9ka\u0159stv\u00ed a pr\u016fmyslu a\u017e po bezpe\u010dnostn\u00ed syst\u00e9my.  Znalost toho, jak tyto vlny blokovat, je proto st\u00e1le d\u016fle\u017eit\u011bj\u0161\u00ed.  Tento \u010dl\u00e1nek se zam\u011b\u0159uje na r\u016fzn\u00e9 metody a materi\u00e1ly vhodn\u00e9 pro blokov\u00e1n\u00ed ultrazvuku.<\/p>\n<h3>Absorbce ultrazvuku<\/h3>\n<p>Absorpce je kl\u00ed\u010dov\u00fd mechanismus pro sni\u017eov\u00e1n\u00ed intenzity ultrazvukov\u00fdch vln.  Materi\u00e1ly s vysokou absorpc\u00ed p\u0159em\u011b\u0148uj\u00ed energii ultrazvuku na teplo.  \u00da\u010dinnost absorpce z\u00e1vis\u00ed na frekvenci ultrazvuku a vlastnostech materi\u00e1lu.  Por\u00e9zn\u00ed materi\u00e1ly, jako je nap\u0159\u00edklad p\u011bna, jsou obecn\u011b efektivn\u011bj\u0161\u00ed absorb\u00e9ry ne\u017e hust\u00e9 materi\u00e1ly.  <\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Materi\u00e1l<\/th>\n<th>\u00da\u010dinnost absorpce (p\u0159ibli\u017en\u00e1)<\/th>\n<th>Frekven\u010dn\u00ed rozsah (kHz)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>P\u011bna z polyuretanu<\/td>\n<td>Vysok\u00e1<\/td>\n<td>20 &#8211; 100<\/td>\n<\/tr>\n<tr>\n<td>Vlna z ov\u010d\u00ed vlny<\/td>\n<td>St\u0159edn\u00ed<\/td>\n<td>20 &#8211; 50<\/td>\n<\/tr>\n<tr>\n<td>Guma<\/td>\n<td>N\u00edzk\u00e1<\/td>\n<td>20 &#8211; 40<\/td>\n<\/tr>\n<tr>\n<td>Olovo<\/td>\n<td>Vysok\u00e1 (vysok\u00e9 frekvence)<\/td>\n<td>&gt;100<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Odraz ultrazvuku<\/h3>\n<p>Odraz ultrazvuku nast\u00e1v\u00e1, kdy\u017e vlny naraz\u00ed na materi\u00e1l s v\u00fdrazn\u011b odli\u0161nou akustickou impedanc\u00ed.  Materi\u00e1ly s vysokou akustickou impedanc\u00ed, jako jsou kovy, odr\u00e1\u017eej\u00ed ultrazvuk efektivn\u011bji ne\u017e materi\u00e1ly s n\u00edzkou akustickou impedanc\u00ed.  Tlou\u0161\u0165ka materi\u00e1lu tak\u00e9 hraje roli \u2013 siln\u011bj\u0161\u00ed materi\u00e1l odr\u00e1\u017e\u00ed v\u00edce energie.<\/p>\n<h3>Tlumen\u00ed ultrazvuku<\/h3>\n<p>Tlumen\u00ed ultrazvuku se dosahuje pou\u017eit\u00edm materi\u00e1l\u016f, kter\u00e9 rozptyluj\u00ed nebo rozb\u00edjej\u00ed ultrazvukov\u00e9 vlny.  To se \u010dasto dosahuje pou\u017eit\u00edm kombinace materi\u00e1l\u016f s r\u016fzn\u00fdmi akustick\u00fdmi vlastnostmi.  Nap\u0159\u00edklad vrstven\u00fd materi\u00e1l s r\u016fzn\u00fdmi hustotami m\u016f\u017ee efektivn\u011b tlumi ultrazvukov\u00e9 vlny.<\/p>\n<h3>Volba materi\u00e1lu pro blokov\u00e1n\u00ed ultrazvuku<\/h3>\n<p>Volba vhodn\u00e9ho materi\u00e1lu z\u00e1vis\u00ed na specifick\u00fdch po\u017eadavc\u00edch aplikace.  Je t\u0159eba zv\u00e1\u017eit frekvenci ultrazvuku, po\u017eadovanou \u00farove\u0148 blokov\u00e1n\u00ed a rozpo\u010det.  Pro vysok\u00e9 frekvence a siln\u00fd ultrazvuk je nutn\u00e9 pou\u017e\u00edt hust\u00e9 materi\u00e1ly s vysokou akustickou impedanc\u00ed.  Pro ni\u017e\u0161\u00ed frekvence m\u016f\u017ee b\u00fdt dostate\u010dn\u00e1 por\u00e9zn\u00ed absorp\u010dn\u00ed vrstva.<\/p>\n<h3>Praktick\u00e9 aplikace<\/h3>\n<p>Blokov\u00e1n\u00ed ultrazvuku se vyu\u017e\u00edv\u00e1 v mnoha oblastech.  Nap\u0159\u00edklad v l\u00e9ka\u0159stv\u00ed se pou\u017e\u00edvaj\u00ed st\u00edn\u011bn\u00ed k minimalizaci ru\u0161en\u00ed ultrazvukov\u00fdch sn\u00edmk\u016f.  V pr\u016fmyslu se blokov\u00e1n\u00ed ultrazvuku pou\u017e\u00edv\u00e1 k ochran\u011b citliv\u00fdch za\u0159\u00edzen\u00ed p\u0159ed po\u0161kozen\u00edm. V bezpe\u010dnostn\u00edch syst\u00e9mech, nap\u0159\u00edklad v detekci pohybu, se blokov\u00e1n\u00ed ultrazvuku m\u016f\u017ee pou\u017e\u00edt k naru\u0161en\u00ed funkce senzor\u016f.<\/p>\n<p>Blokov\u00e1n\u00ed ultrazvuku je komplexn\u00ed proces z\u00e1visl\u00fd na mnoha faktorech.  Spr\u00e1vn\u00e1 volba materi\u00e1lu a designu je kl\u00ed\u010dov\u00e1 pro dosa\u017een\u00ed po\u017eadovan\u00e9 \u00farovn\u011b ochrany p\u0159ed ultrazvukem.  Pochopen\u00ed mechanism\u016f absorpce, odrazu a tlumen\u00ed je nezbytn\u00e9 pro efektivn\u00ed blokov\u00e1n\u00ed ultrazvukov\u00fdch vln.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ultrazvukov\u00e9 vlny, neviditeln\u00e9 a nesly\u0161iteln\u00e9, se v dne\u0161n\u00ed dob\u011b vyu\u017e\u00edvaj\u00ed v \u0161irok\u00e9 \u0161k\u00e1le aplikac\u00ed, od l\u00e9ka\u0159stv\u00ed a pr\u016fmyslu a\u017e po bezpe\u010dnostn\u00ed syst\u00e9my. Znalost toho, jak tyto vlny blokovat, je proto st\u00e1le d\u016fle\u017eit\u011bj\u0161\u00ed. Tento \u010dl\u00e1nek se zam\u011b\u0159uje na r\u016fzn\u00e9 metody a materi\u00e1ly vhodn\u00e9 pro blokov\u00e1n\u00ed ultrazvuku. Absorbce ultrazvuku Absorpce je kl\u00ed\u010dov\u00fd mechanismus pro sni\u017eov\u00e1n\u00ed intenzity ultrazvukov\u00fdch<\/p>\n","protected":false},"author":1,"featured_media":26471,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-60836","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\/60836","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=60836"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60836\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/26471"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=60836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=60836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=60836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}