{"id":63576,"date":"2022-05-18T03:30:06","date_gmt":"2022-05-18T08:30:06","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-does-temperature-effectpiezoceramic-transducers\/"},"modified":"2025-01-27T06:06:20","modified_gmt":"2025-01-27T11:06:20","slug":"how-does-temperature-effectpiezoceramic-transducers","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-does-temperature-effectpiezoceramic-transducers\/","title":{"rendered":"Vliv teploty na piezoelektrick\u00e9 sn\u00edma\u010de"},"content":{"rendered":"<p>Piezokrystalick\u00e9 sn\u00edma\u010de jsou citliv\u00e9 na zm\u011bny teploty, a to z n\u011bkolika d\u016fvod\u016f, kter\u00e9 v\u00fdznamn\u011b ovliv\u0148uj\u00ed jejich funkci a \u017eivotnost.  Tento \u010dl\u00e1nek podrobn\u011bji rozebere, jak teplota ovliv\u0148uje vlastnosti a v\u00fdkon t\u011bchto d\u016fle\u017eit\u00fdch za\u0159\u00edzen\u00ed.<\/p>\n<p>Vliv teploty na piezoelektrick\u00fd koeficient<\/p>\n<p>Piezoelektrick\u00fd koeficient, kl\u00ed\u010dov\u00fd parametr ur\u010duj\u00edc\u00ed citlivost sn\u00edma\u010de, je siln\u011b z\u00e1visl\u00fd na teplot\u011b.  S rostouc\u00ed teplotou se piezoelektrick\u00fd koeficient v\u011bt\u0161iny materi\u00e1l\u016f, pou\u017e\u00edvan\u00fdch v piezokrystalick\u00fdch sn\u00edma\u010d\u00edch, sni\u017euje.  Tento pokles nen\u00ed line\u00e1rn\u00ed a z\u00e1vis\u00ed na konkr\u00e9tn\u00edm materi\u00e1lu a jeho slo\u017een\u00ed.  N\u011bkter\u00e9 materi\u00e1ly vykazuj\u00ed v\u011bt\u0161\u00ed citlivost na teplotn\u00ed zm\u011bny ne\u017e jin\u00e9.  Nap\u0159\u00edklad, p\u0159i pou\u017eit\u00ed v aplikac\u00edch s vysok\u00fdmi teplotami, je d\u016fle\u017eit\u00e9 zvolit materi\u00e1ly s co nejmen\u0161\u00ed teplotn\u00ed z\u00e1vislost\u00ed piezoelektrick\u00e9ho koeficientu.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Materi\u00e1l<\/th>\n<th>Teplotn\u00ed koeficient piezoelektrick\u00e9ho koeficientu (ppm\/\u00b0C)<\/th>\n<th>Teplotn\u00ed rozsah (\u2103)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>PZT-4<\/td>\n<td>-300 a\u017e -400<\/td>\n<td>-20 a\u017e +80<\/td>\n<\/tr>\n<tr>\n<td>PZT-5A<\/td>\n<td>-350 a\u017e -450<\/td>\n<td>-20 a\u017e +80<\/td>\n<\/tr>\n<tr>\n<td>PZT-5H<\/td>\n<td>-400 a\u017e -500<\/td>\n<td>-20 a\u017e +80<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Teplotn\u00ed z\u00e1vislost rezonan\u010dn\u00ed frekvence<\/p>\n<p>Rezonan\u010dn\u00ed frekvence piezokrystalick\u00e9ho sn\u00edma\u010de je tak\u00e9 ovlivn\u011bna teplotou.  Podobn\u011b jako piezoelektrick\u00fd koeficient, i rezonan\u010dn\u00ed frekvence se s rostouc\u00ed teplotou obvykle sni\u017euje.  Tato zm\u011bna frekvence m\u016f\u017ee v\u00e9st k nep\u0159esnostem m\u011b\u0159en\u00ed a v n\u011bkter\u00fdch p\u0159\u00edpadech i k selh\u00e1n\u00ed za\u0159\u00edzen\u00ed.  Precizn\u00ed aplikace proto vy\u017eaduj\u00ed kompenzaci teplotn\u00edch efekt\u016f, nap\u0159\u00edklad pomoc\u00ed teplotn\u00ed kompenzace obvodu nebo v\u00fdb\u011brem materi\u00e1l\u016f s n\u00edzkou teplotn\u00ed z\u00e1vislost\u00ed rezonan\u010dn\u00ed frekvence.<\/p>\n<p>Vliv teploty na mechanick\u00e9 vlastnosti<\/p>\n<p>Teplota ovliv\u0148uje nejen elektrick\u00e9, ale i mechanick\u00e9 vlastnosti piezokrystalick\u00fdch sn\u00edma\u010d\u016f.  Zm\u011bny teploty mohou zp\u016fsobit rozta\u017enost nebo smr\u0161t\u011bn\u00ed materi\u00e1lu, co\u017e m\u016f\u017ee v\u00e9st k mechanick\u00e9mu nam\u00e1h\u00e1n\u00ed a potenci\u00e1ln\u00edmu po\u0161kozen\u00ed sn\u00edma\u010de.  To je obzvl\u00e1\u0161t\u011b d\u016fle\u017eit\u00e9 u aplikac\u00ed s velk\u00fdmi teplotn\u00edmi v\u00fdkyvy.  V\u00fdb\u011br vhodn\u00e9ho materi\u00e1lu s n\u00edzkou teplotn\u00ed rozta\u017enost\u00ed je proto kl\u00ed\u010dov\u00fd pro zaji\u0161t\u011bn\u00ed dlouhodob\u00e9 spolehlivosti sn\u00edma\u010de.<\/p>\n<p>Teplotn\u00ed stabilita a kompenzace<\/p>\n<p>Pro dosa\u017een\u00ed vysok\u00e9 p\u0159esnosti a spolehlivosti je nezbytn\u00e9 zv\u00e1\u017eit teplotn\u00ed stabilitu piezokrystalick\u00fdch sn\u00edma\u010d\u016f.  Existuj\u00ed r\u016fzn\u00e9 metody pro kompenzaci teplotn\u00edch efekt\u016f, v\u010detn\u011b pou\u017eit\u00ed teplotn\u011b kompenzovan\u00fdch materi\u00e1l\u016f, elektronick\u00e9 kompenzace sign\u00e1lu a teplotn\u00ed stabilizace prost\u0159ed\u00ed.  Volba vhodn\u00e9 metody z\u00e1vis\u00ed na po\u017eadavc\u00edch konkr\u00e9tn\u00ed aplikace a dostupn\u00fdch zdroj\u00edch.<\/p>\n<p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee teplota m\u00e1 v\u00fdznamn\u00fd vliv na vlastnosti a v\u00fdkon piezokrystalick\u00fdch sn\u00edma\u010d\u016f.  Porozum\u011bn\u00ed t\u011bmto vliv\u016fm je kl\u00ed\u010dov\u00e9 pro n\u00e1vrh a provoz spolehliv\u00fdch a p\u0159esn\u00fdch syst\u00e9m\u016f vyu\u017e\u00edvaj\u00edc\u00edch tyto sn\u00edma\u010de. Spr\u00e1vn\u00fd v\u00fdb\u011br materi\u00e1lu a implementace vhodn\u00fdch kompenza\u010dn\u00edch technik jsou nezbytn\u00e9 pro optimalizaci jejich v\u00fdkonu v \u0161irok\u00e9m teplotn\u00edm rozsahu.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Piezokrystalick\u00e9 sn\u00edma\u010de jsou citliv\u00e9 na zm\u011bny teploty, a to z n\u011bkolika d\u016fvod\u016f, kter\u00e9 v\u00fdznamn\u011b ovliv\u0148uj\u00ed jejich funkci a \u017eivotnost. Tento \u010dl\u00e1nek podrobn\u011bji rozebere, jak teplota ovliv\u0148uje vlastnosti a v\u00fdkon t\u011bchto d\u016fle\u017eit\u00fdch za\u0159\u00edzen\u00ed. Vliv teploty na piezoelektrick\u00fd koeficient Piezoelektrick\u00fd koeficient, kl\u00ed\u010dov\u00fd parametr ur\u010duj\u00edc\u00ed citlivost sn\u00edma\u010de, je siln\u011b z\u00e1visl\u00fd na teplot\u011b. S rostouc\u00ed teplotou se piezoelektrick\u00fd koeficient<\/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-63576","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\/63576","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=63576"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/63576\/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=63576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=63576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=63576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}