{"id":61246,"date":"2023-04-21T14:23:34","date_gmt":"2023-04-21T19:23:34","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-does-a-piezo-transducer-work\/"},"modified":"2025-01-27T06:05:44","modified_gmt":"2025-01-27T11:05:44","slug":"how-does-a-piezo-transducer-work","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-does-a-piezo-transducer-work\/","title":{"rendered":"Piezoelektrick\u00fd sn\u00edma\u010d: princip funkce a vyu\u017eit\u00ed"},"content":{"rendered":"<p>Piezoelektrick\u00fd jev, na kter\u00e9m je princip \u010dinnosti piezoelektrick\u00e9ho sn\u00edma\u010de zalo\u017een, je fascinuj\u00edc\u00ed a z\u00e1rove\u0148 prakticky vyu\u017eiteln\u00fd.  Tento \u010dl\u00e1nek podrobn\u011b rozebere, jak tyto sn\u00edma\u010de funguj\u00ed, od z\u00e1kladn\u00edch princip\u016f a\u017e po praktick\u00e9 aplikace.<\/p>\n<p>Piezoelektrick\u00fd efekt: Z\u00e1kladn\u00ed princip<\/p>\n<p>Piezoelektrick\u00fd efekt popisuje schopnost n\u011bkter\u00fdch krystalick\u00fdch materi\u00e1l\u016f, jako je k\u0159emen, turmal\u00edn nebo syntetick\u00e9 materi\u00e1ly jako je titan\u00e1t barnat\u00fd (BaTiO\u2083) a zirkon\u00e1t olovnat\u00fd titani\u010dit\u00fd (PZT), generovat elektrick\u00e9 nap\u011bt\u00ed v reakci na mechanick\u00e9 nap\u011bt\u00ed (tlak, tah, vibrace) a naopak.  Tento vz\u00e1jemn\u00fd vztah mezi mechanickou a elektrickou energi\u00ed je kl\u00ed\u010dov\u00fd pro fungov\u00e1n\u00ed piezoelektrick\u00fdch sn\u00edma\u010d\u016f.  Kdy\u017e je krystal mechanicky deformov\u00e1n, doch\u00e1z\u00ed k p\u0159eskupen\u00ed jeho vnit\u0159n\u00ed struktury a n\u00e1sledn\u00e9mu vzniku elektrick\u00e9ho n\u00e1boje na jeho povrchu.  Naopak, p\u0159i aplikaci elektrick\u00e9ho pole se krystal deformuje.  Tato obousm\u011brn\u00e1 konverze energie je z\u00e1kladem \u0161irok\u00e9ho spektra aplikac\u00ed piezoelektrick\u00fdch sn\u00edma\u010d\u016f.<\/p>\n<p>Druhy piezoelektrick\u00fdch sn\u00edma\u010d\u016f<\/p>\n<p>Piezoelektrick\u00e9 sn\u00edma\u010de se d\u011bl\u00ed do n\u011bkolika kategori\u00ed podle jejich konstrukce a pou\u017eit\u00ed.  Mezi nej\u010dast\u011bj\u0161\u00ed pat\u0159\u00ed:<\/p>\n<ul>\n<li><strong>Sn\u00edma\u010de tlaku:<\/strong> M\u011b\u0159\u00ed statick\u00fd tlak nebo dynamick\u00e9 zm\u011bny tlaku.<\/li>\n<li><strong>Sn\u00edma\u010de zrychlen\u00ed:<\/strong> Detekuj\u00ed vibrace a zrychlen\u00ed.<\/li>\n<li><strong>Ultrazvukov\u00e9 sn\u00edma\u010de:<\/strong>  Pou\u017e\u00edvaj\u00ed se k generov\u00e1n\u00ed a detekci ultrazvukov\u00fdch vln.  Tyto sn\u00edma\u010de nach\u00e1zej\u00ed uplatn\u011bn\u00ed v r\u016fzn\u00fdch oblastech, od l\u00e9ka\u0159sk\u00e9 diagnostiky (ultrazvuk) po pr\u016fmyslov\u00e9 aplikace (ultrazvukov\u00e9 \u010di\u0161t\u011bn\u00ed, m\u011b\u0159en\u00ed vzd\u00e1lenosti).<\/li>\n<li>\n<p><strong>Sn\u00edma\u010de s\u00edly:<\/strong> M\u011b\u0159\u00ed aplikovanou s\u00edlu.<\/p>\n<p>Typ sn\u00edma\u010de<br \/>\nPrincip funkce<br \/>\nTypick\u00e9 aplikace<\/p>\n<p>Sn\u00edma\u010d tlaku<br \/>\nDeformace piezoelektrick\u00e9ho materi\u00e1lu zp\u016fsoben\u00e1 tlakem generuje elektrick\u00fd n\u00e1boj.<br \/>\nM\u011b\u0159en\u00ed tlaku v pneumatik\u00e1ch, meteorologie, pr\u016fmyslov\u00e1 automatizace.<\/p>\n<p>Sn\u00edma\u010d zrychlen\u00ed<br \/>\nZrychlen\u00ed zp\u016fsobuje mechanickou deformaci piezoelektrick\u00e9ho materi\u00e1lu, kter\u00e1 generuje elektrick\u00fd sign\u00e1l.<br \/>\nAutomobilov\u00fd pr\u016fmysl (airbagy), seismologie, monitorov\u00e1n\u00ed vibrac\u00ed.<\/p>\n<p>Ultrazvukov\u00fd sn\u00edma\u010d<br \/>\nP\u0159evod elektrick\u00e9ho sign\u00e1lu na mechanick\u00e9 vibrace (ultrazvuk) a naopak.<br \/>\nL\u00e9ka\u0159sk\u00e1 diagnostika, ultrazvukov\u00e9 \u010di\u0161t\u011bn\u00ed, m\u011b\u0159en\u00ed vzd\u00e1lenosti a tlou\u0161\u0165ky materi\u00e1l\u016f.<\/p>\n<\/li>\n<\/ul>\n<p>Konstrukce a materi\u00e1ly<\/p>\n<p>Konstrukce piezoelektrick\u00e9ho sn\u00edma\u010de se li\u0161\u00ed v z\u00e1vislosti na jeho aplikaci.  Z\u00e1kladn\u00edm prvkem je piezoelektrick\u00fd materi\u00e1l, kter\u00fd je obvykle obklopen kovov\u00fdmi elektrodami pro sb\u011br generovan\u00e9ho n\u00e1boje.  Elektrody jsou p\u0159ipojeny k obvodu, kter\u00fd zpracov\u00e1v\u00e1 a zesiluje slab\u00fd elektrick\u00fd sign\u00e1l.  V\u00fdb\u011br materi\u00e1lu z\u00e1vis\u00ed na po\u017eadovan\u00fdch vlastnostech sn\u00edma\u010de, jako je citlivost, frekven\u010dn\u00ed rozsah a odolnost.  PZT (zirkon\u00e1t olovnat\u00fd titani\u010dit\u00fd) je velmi roz\u0161\u00ed\u0159en\u00fd materi\u00e1l pro svou vysokou piezoelektrickou citlivost.<\/p>\n<p>Aplikace piezoelektrick\u00fdch sn\u00edma\u010d\u016f<\/p>\n<p>Piezoelektrick\u00e9 sn\u00edma\u010de nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha oblastech, v\u010detn\u011b:<\/p>\n<ul>\n<li><strong>L\u00e9ka\u0159stv\u00ed:<\/strong> Ultrazvukov\u00e9 zobrazov\u00e1n\u00ed, kardiostimul\u00e1tory.<\/li>\n<li><strong>Pr\u016fmysl:<\/strong> Senzory tlaku a s\u00edly, ultrazvukov\u00e9 \u010di\u0161t\u011bn\u00ed, m\u011b\u0159en\u00ed vibrac\u00ed.<\/li>\n<li><strong>Automobilov\u00fd pr\u016fmysl:<\/strong> Airbagy, senzory tlaku v pneumatik\u00e1ch.<\/li>\n<li><strong>Elektronika:<\/strong> Zapalova\u010de, reproduktory (n\u011bkter\u00e9 typy).<\/li>\n<\/ul>\n<p>Omezen\u00ed a v\u00fdzvy<\/p>\n<p>P\u0159esto\u017ee piezoelektrick\u00e9 sn\u00edma\u010de nab\u00edzej\u00ed mnoho v\u00fdhod, existuj\u00ed i \u200b\u200bn\u011bkter\u00e1 omezen\u00ed.  Jde nap\u0159\u00edklad o:<\/p>\n<ul>\n<li><strong>Citlivost na teplotu:<\/strong>  Piezoelektrick\u00e9 vlastnosti se mohou m\u011bnit s teplotou.<\/li>\n<li><strong>Omezen\u00e1 \u017eivotnost:<\/strong>  Mechanick\u00e9 nam\u00e1h\u00e1n\u00ed m\u016f\u017ee v\u00e9st k degradaci materi\u00e1lu.<\/li>\n<li><strong>N\u00edzk\u00e1 v\u00fdstupn\u00ed impedance:<\/strong>  Vy\u017eaduje zes\u00edlen\u00ed sign\u00e1lu.<\/li>\n<\/ul>\n<p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee piezoelektrick\u00e9 sn\u00edma\u010de p\u0159edstavuj\u00ed d\u016fle\u017eitou sou\u010d\u00e1st modern\u00ed techniky. Jejich schopnost p\u0159em\u011b\u0148ovat mechanickou energii na elektrickou a naopak umo\u017e\u0148uje \u0161irok\u00e9 spektrum aplikac\u00ed.  Pochopen\u00ed princip\u016f jejich fungov\u00e1n\u00ed je kl\u00ed\u010dov\u00e9 pro efektivn\u00ed vyu\u017eit\u00ed jejich potenci\u00e1lu.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Piezoelektrick\u00fd jev, na kter\u00e9m je princip \u010dinnosti piezoelektrick\u00e9ho sn\u00edma\u010de zalo\u017een, je fascinuj\u00edc\u00ed a z\u00e1rove\u0148 prakticky vyu\u017eiteln\u00fd. Tento \u010dl\u00e1nek podrobn\u011b rozebere, jak tyto sn\u00edma\u010de funguj\u00ed, od z\u00e1kladn\u00edch princip\u016f a\u017e po praktick\u00e9 aplikace. Piezoelektrick\u00fd efekt: Z\u00e1kladn\u00ed princip Piezoelektrick\u00fd efekt popisuje schopnost n\u011bkter\u00fdch krystalick\u00fdch materi\u00e1l\u016f, jako je k\u0159emen, turmal\u00edn nebo syntetick\u00e9 materi\u00e1ly jako je titan\u00e1t barnat\u00fd (BaTiO\u2083) a<\/p>\n","protected":false},"author":1,"featured_media":19418,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-61246","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\/61246","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=61246"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/61246\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/19418"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=61246"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=61246"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=61246"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}