{"id":57526,"date":"2023-04-22T03:07:34","date_gmt":"2023-04-22T08:07:34","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-does-a-piezoelectric-transducer-work\/"},"modified":"2025-01-27T06:05:47","modified_gmt":"2025-01-27T11:05:47","slug":"how-does-a-piezoelectric-transducer-work","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-does-a-piezoelectric-transducer-work\/","title":{"rendered":"Piezoelektrick\u00fd sn\u00edma\u010d: princip funkce a vyu\u017eit\u00ed"},"content":{"rendered":"

Piezoelektrick\u00e9 m\u011bni\u010de jsou fascinuj\u00edc\u00ed za\u0159\u00edzen\u00ed, kter\u00e1 dok\u00e1\u017e\u00ed p\u0159ev\u00e1d\u011bt mechanickou energii na energii elektrickou a naopak. Tento proces je zalo\u017een na unik\u00e1tn\u00edm jevu zvan\u00e9m piezoelektrick\u00fd efekt, kter\u00fd se projevuje u ur\u010dit\u00fdch krystalick\u00fdch materi\u00e1l\u016f. Pochopen\u00ed principu jejich fungov\u00e1n\u00ed otev\u00edr\u00e1 dve\u0159e k mnoha aplikac\u00edm, od ultrazvukov\u00e9 diagnostiky a\u017e po zapalova\u010de. Tento \u010dl\u00e1nek se zam\u011b\u0159\u00ed na detailn\u00ed vysv\u011btlen\u00ed fungov\u00e1n\u00ed piezoelektrick\u00e9ho m\u011bni\u010de.<\/p>\n

Piezoelektrick\u00fd efekt: Z\u00e1kladn\u00ed princip<\/h3>\n

Piezoelektrick\u00fd efekt popisuje schopnost n\u011bkter\u00fdch materi\u00e1l\u016f generovat elektrick\u00e9 nap\u011bt\u00ed v reakci na mechanick\u00e9 nap\u011bt\u00ed (tlak, tah, vibrace). Tento efekt je reverzibiln\u00ed, co\u017e znamen\u00e1, \u017ee aplikace elektrick\u00e9ho pole na piezoelektrick\u00fd materi\u00e1l zp\u016fsob\u00ed jeho mechanickou deformaci. Tento vz\u00e1jemn\u00fd vztah mezi mechanickou a elektrickou energi\u00ed je kl\u00ed\u010dov\u00fd pro fungov\u00e1n\u00ed piezoelektrick\u00fdch m\u011bni\u010d\u016f. Materi\u00e1ly vykazuj\u00edc\u00ed tento efekt zahrnuj\u00ed nap\u0159\u00edklad k\u0159emen, turmal\u00edn a syntetick\u00e9 keramiky, jako je nap\u0159\u00edklad titan\u00e1t barnat\u00fd (BaTiO\u2083) nebo zirkon\u00e1t olovnato-titani\u010dit\u00fd (PZT). PZT je zvl\u00e1\u0161t\u011b obl\u00edben\u00fd pro svou vysokou piezoelektrickou citlivost.<\/p>\n

Struktura a konstrukce piezoelektrick\u00e9ho m\u011bni\u010de<\/h3>\n

Piezoelektrick\u00fd m\u011bni\u010d typicky sest\u00e1v\u00e1 z tenk\u00e9 vrstvy piezoelektrick\u00e9ho materi\u00e1lu, kter\u00e1 je opat\u0159ena elektrodami na obou stran\u00e1ch. Tyto elektrody umo\u017e\u0148uj\u00ed aplikaci elektrick\u00e9ho nap\u011bt\u00ed nebo odb\u011br generovan\u00e9ho elektrick\u00e9ho n\u00e1boje. Konstrukce se m\u016f\u017ee li\u0161it v z\u00e1vislosti na zam\u00fd\u0161len\u00e9 aplikaci. M\u016f\u017ee to b\u00fdt jednoduch\u00e1 desti\u010dka, ale tak\u00e9 slo\u017eit\u011bj\u0161\u00ed konstrukce s v\u00edce vrstvami piezoelektrick\u00fdch materi\u00e1l\u016f pro zv\u00fd\u0161en\u00ed \u00fa\u010dinnosti nebo specifick\u00e9 frekven\u010dn\u00ed charakteristiky.<\/p>\n

P\u0159evod mechanick\u00e9 energie na elektrickou energii<\/h3>\n

Kdy\u017e je piezoelektrick\u00fd materi\u00e1l vystaven mechanick\u00e9mu tlaku nebo tahu, doch\u00e1z\u00ed k deformaci krystalov\u00e9 m\u0159\u00ed\u017eky. Tato deformace vede k posunu iont\u016f v krystalov\u00e9 struktu\u0159e, co\u017e indukuje elektrick\u00e9 n\u00e1boje na povrchu materi\u00e1lu. Vzhledem k p\u0159\u00edtomnosti elektrod je tento n\u00e1boj shroma\u017e\u010fov\u00e1n a vytv\u00e1\u0159\u00ed se elektrick\u00e9 nap\u011bt\u00ed. Intenzita generovan\u00e9ho nap\u011bt\u00ed z\u00e1vis\u00ed na velikosti mechanick\u00e9ho nap\u011bt\u00ed a na vlastnostech piezoelektrick\u00e9ho materi\u00e1lu.<\/p>\n

P\u0159evod elektrick\u00e9 energie na mechanickou energii<\/h3>\n

Reverzn\u00ed piezoelektrick\u00fd efekt umo\u017e\u0148uje p\u0159evod elektrick\u00e9 energie na mechanickou. Aplikace elektrick\u00e9ho pole na piezoelektrick\u00fd materi\u00e1l zp\u016fsob\u00ed deformaci krystalov\u00e9 m\u0159\u00ed\u017eky. Velikost t\u00e9to deformace z\u00e1vis\u00ed na velikosti aplikovan\u00e9ho elektrick\u00e9ho pole a na vlastnostech materi\u00e1lu. Tato deformace se projevuje jako zm\u011bna rozm\u011br\u016f materi\u00e1lu, a\u0165 u\u017e zv\u011bt\u0161en\u00ed nebo zmen\u0161en\u00ed, v z\u00e1vislosti na polarit\u011b aplikovan\u00e9ho nap\u011bt\u00ed. Tento princip se vyu\u017e\u00edv\u00e1 nap\u0159\u00edklad v ultrazvukov\u00fdch sn\u00edma\u010d\u00edch.<\/p>\n

Aplikace piezoelektrick\u00fdch m\u011bni\u010d\u016f<\/h3>\n

Piezoelektrick\u00e9 m\u011bni\u010de nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha oblastech:<\/p>\n\n\n\n\n\n\n\n\n\n
Aplikace<\/th>\nPopis<\/th>\n<\/tr>\n<\/thead>\n
Ultrazvukov\u00e1 diagnostika<\/td>\nGenerov\u00e1n\u00ed a detekce ultrazvukov\u00fdch vln pro zobrazov\u00e1n\u00ed vnit\u0159n\u00edch org\u00e1n\u016f.<\/td>\n<\/tr>\n
Zapalova\u010de<\/td>\nGenerov\u00e1n\u00ed jiskry pro zap\u00e1len\u00ed plynu.<\/td>\n<\/tr>\n
Senzory tlaku<\/td>\nM\u011b\u0159en\u00ed tlaku pomoc\u00ed zm\u011bny generovan\u00e9ho nap\u011bt\u00ed.<\/td>\n<\/tr>\n
Ak\u010dn\u00ed \u010dleny<\/td>\nP\u0159esn\u00e9 polohov\u00e1n\u00ed a ovl\u00e1d\u00e1n\u00ed v mikromechanice.<\/td>\n<\/tr>\n
Sonary<\/td>\nDetekce objekt\u016f pod vodou pomoc\u00ed ultrazvukov\u00fdch vln.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pou\u017eit\u00ed piezoelektrick\u00fdch m\u011bni\u010d\u016f v ultrazvukov\u00e9 diagnostice je typick\u00fdm p\u0159\u00edkladem. Za\u0159\u00edzen\u00ed od Beijing Ultrasonic vyu\u017e\u00edvaj\u00ed piezoelektrick\u00e9 m\u011bni\u010de k vys\u00edl\u00e1n\u00ed a p\u0159\u00edjmu ultrazvukov\u00fdch vln, kter\u00e9 se n\u00e1sledn\u011b zpracov\u00e1vaj\u00ed a zobrazuj\u00ed na monitoru.<\/p>\n

Piezoelektrick\u00e9 m\u011bni\u010de p\u0159edstavuj\u00ed d\u016fle\u017eitou sou\u010d\u00e1st mnoha modern\u00edch technologi\u00ed. Jejich jedine\u010dn\u00e1 schopnost p\u0159ev\u00e1d\u011bt mechanickou a elektrickou energii otev\u00edr\u00e1 \u0161irok\u00e9 pole aplikac\u00ed, kter\u00e9 se neust\u00e1le roz\u0161i\u0159uj\u00ed s v\u00fdvojem nov\u00fdch materi\u00e1l\u016f a technologi\u00ed. Pochopen\u00ed principu jejich fungov\u00e1n\u00ed je kl\u00ed\u010dov\u00e9 pro dal\u0161\u00ed v\u00fdvoj a inovaci v t\u00e9to oblasti.<\/p>\n","protected":false},"excerpt":{"rendered":"

Piezoelektrick\u00e9 m\u011bni\u010de jsou fascinuj\u00edc\u00ed za\u0159\u00edzen\u00ed, kter\u00e1 dok\u00e1\u017e\u00ed p\u0159ev\u00e1d\u011bt mechanickou energii na energii elektrickou a naopak. Tento proces je zalo\u017een na unik\u00e1tn\u00edm jevu zvan\u00e9m piezoelektrick\u00fd efekt, kter\u00fd se projevuje u ur\u010dit\u00fdch krystalick\u00fdch materi\u00e1l\u016f. Pochopen\u00ed principu jejich fungov\u00e1n\u00ed otev\u00edr\u00e1 dve\u0159e k mnoha aplikac\u00edm, od ultrazvukov\u00e9 diagnostiky a\u017e po zapalova\u010de. Tento \u010dl\u00e1nek se zam\u011b\u0159\u00ed na detailn\u00ed vysv\u011btlen\u00ed fungov\u00e1n\u00ed<\/p>\n","protected":false},"author":1,"featured_media":19409,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-57526","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\/57526","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=57526"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/57526\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/19409"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=57526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=57526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=57526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}