{"id":54221,"date":"2022-08-18T23:07:05","date_gmt":"2022-08-19T04:07:05","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-can-poling-and-depoling-in-piezoceramic-materials\/"},"modified":"2025-01-21T07:11:03","modified_gmt":"2025-01-21T12:11:03","slug":"how-can-poling-and-depoling-in-piezoceramic-materials","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-can-poling-and-depoling-in-piezoceramic-materials\/","title":{"rendered":"K\u1ef9 thu\u1eadt ph\u00e2n c\u1ef1c v\u00e0 kh\u1eed c\u1ef1c v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n"},"content":{"rendered":"<p>V\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n g\u1ed1m (piezoceramic) c\u00f3 kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc th\u00e0nh n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n n\u00e0y ph\u1ee5 thu\u1ed9c m\u1ea1nh m\u1ebd v\u00e0o s\u1ef1 ph\u00e2n c\u1ef1c c\u1ee7a v\u1eadt li\u1ec7u, m\u1ed9t qu\u00e1 tr\u00ecnh s\u1eafp x\u1ebfp c\u00e1c dipole \u0111i\u1ec7n b\u00ean trong v\u1eadt li\u1ec7u theo m\u1ed9t h\u01b0\u1edbng c\u1ee5 th\u1ec3. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o c\u01a1 ch\u1ebf ph\u00e2n c\u1ef1c (poling) v\u00e0 kh\u1eed ph\u00e2n c\u1ef1c (depoling) trong v\u1eadt li\u1ec7u piezoceramic, l\u00e0m r\u00f5 t\u1ea7m quan tr\u1ecdng c\u1ee7a ch\u00fang trong vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u00e1p \u0111i\u1ec7n.<\/p>\n<h3>C\u01a1 ch\u1ebf ph\u00e2n c\u1ef1c (Poling)<\/h3>\n<p>Qu\u00e1 tr\u00ecnh ph\u00e2n c\u1ef1c li\u00ean quan \u0111\u1ebfn vi\u1ec7c \u00e1p d\u1ee5ng m\u1ed9t \u0111i\u1ec7n tr\u01b0\u1eddng m\u1ea1nh m\u1ebd (th\u01b0\u1eddng l\u1edbn h\u01a1n c\u01b0\u1eddng \u0111\u1ed9 \u0111i\u1ec7n tr\u01b0\u1eddng kh\u00e1ng c\u1ef1c) l\u00ean v\u1eadt li\u1ec7u piezoceramic \u1edf nhi\u1ec7t \u0111\u1ed9 cao, g\u1ea7n \u0111i\u1ec3m Curie c\u1ee7a v\u1eadt li\u1ec7u. Nhi\u1ec7t \u0111\u1ed9 cao gi\u00fap c\u00e1c dipole \u0111i\u1ec7n d\u1ec5 d\u00e0ng xoay theo h\u01b0\u1edbng c\u1ee7a \u0111i\u1ec7n tr\u01b0\u1eddng ngo\u00e0i. Khi \u0111i\u1ec7n tr\u01b0\u1eddng \u0111\u01b0\u1ee3c duy tr\u00ec trong m\u1ed9t th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh, c\u00e1c dipole n\u00e0y s\u1ebd b\u1ecb &quot;kh\u00f3a&quot; \u1edf v\u1ecb tr\u00ed m\u1edbi, ngay c\u1ea3 khi \u0111i\u1ec7n tr\u01b0\u1eddng b\u1ecb lo\u1ea1i b\u1ecf. K\u1ebft qu\u1ea3 l\u00e0 v\u1eadt li\u1ec7u tr\u1edf n\u00ean ph\u00e2n c\u1ef1c v\u00e0 th\u1ec3 hi\u1ec7n hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n.<\/p>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh ph\u00e2n c\u1ef1c<\/h3>\n<p>Hi\u1ec7u qu\u1ea3 c\u1ee7a qu\u00e1 tr\u00ecnh ph\u00e2n c\u1ef1c ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>C\u01b0\u1eddng \u0111\u1ed9 \u0111i\u1ec7n tr\u01b0\u1eddng:<\/strong> \u0110i\u1ec7n tr\u01b0\u1eddng c\u00e0ng m\u1ea1nh, m\u1ee9c \u0111\u1ed9 ph\u00e2n c\u1ef1c c\u00e0ng cao.<\/li>\n<li><strong>Nhi\u1ec7t \u0111\u1ed9:<\/strong> Nhi\u1ec7t \u0111\u1ed9 g\u1ea7n \u0111i\u1ec3m Curie cho ph\u00e9p c\u00e1c dipole di chuy\u1ec3n d\u1ec5 d\u00e0ng h\u01a1n.<\/li>\n<li><strong>Th\u1eddi gian ph\u00e2n c\u1ef1c:<\/strong> Th\u1eddi gian \u00e1p d\u1ee5ng \u0111i\u1ec7n tr\u01b0\u1eddng c\u1ea7n \u0111\u1ee7 d\u00e0i \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 s\u1eafp x\u1ebfp \u1ed5n \u0111\u1ecbnh c\u1ee7a c\u00e1c dipole.<\/li>\n<li><strong>Th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u:<\/strong> C\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u piezoceramic kh\u00e1c nhau c\u00f3 c\u00e1c \u0111\u1eb7c t\u00ednh ph\u00e2n c\u1ef1c kh\u00e1c nhau.<\/li>\n<\/ul>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Y\u1ebfu t\u1ed1<\/th>\n<th>\u1ea2nh h\u01b0\u1edfng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u01b0\u1eddng \u0111\u1ed9 \u0111i\u1ec7n tr\u01b0\u1eddng<\/td>\n<td>T\u0103ng c\u01b0\u1eddng \u0111\u1ed9 ph\u00e2n c\u1ef1c<\/td>\n<\/tr>\n<tr>\n<td>Nhi\u1ec7t \u0111\u1ed9<\/td>\n<td>T\u0103ng kh\u1ea3 n\u0103ng di chuy\u1ec3n c\u1ee7a dipole<\/td>\n<\/tr>\n<tr>\n<td>Th\u1eddi gian ph\u00e2n c\u1ef1c<\/td>\n<td>C\u1ee7ng c\u1ed1 s\u1ef1 s\u1eafp x\u1ebfp c\u1ee7a dipole<\/td>\n<\/tr>\n<tr>\n<td>Th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u<\/td>\n<td>\u0110\u1eb7c t\u00ednh ph\u00e2n c\u1ef1c ri\u00eang bi\u1ec7t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>C\u01a1 ch\u1ebf kh\u1eed ph\u00e2n c\u1ef1c (Depoling)<\/h3>\n<p>Kh\u1eed ph\u00e2n c\u1ef1c l\u00e0 qu\u00e1 tr\u00ecnh l\u00e0m m\u1ea5t \u0111i s\u1ef1 ph\u00e2n c\u1ef1c c\u1ee7a v\u1eadt li\u1ec7u piezoceramic. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 x\u1ea3y ra do nhi\u1ec1u nguy\u00ean nh\u00e2n, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Nhi\u1ec7t \u0111\u1ed9 cao:<\/strong> Nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t qu\u00e1 \u0111i\u1ec3m Curie s\u1ebd l\u00e0m m\u1ea5t tr\u1eadt t\u1ef1 s\u1eafp x\u1ebfp c\u1ee7a c\u00e1c dipole.<\/li>\n<li><strong>\u0110i\u1ec7n tr\u01b0\u1eddng m\u1ea1nh ng\u01b0\u1ee3c chi\u1ec1u:<\/strong> M\u1ed9t \u0111i\u1ec7n tr\u01b0\u1eddng m\u1ea1nh ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi \u0111i\u1ec7n tr\u01b0\u1eddng ph\u00e2n c\u1ef1c ban \u0111\u1ea7u c\u00f3 th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c s\u1ef1 ph\u00e2n c\u1ef1c.<\/li>\n<li><strong>\u1ee8ng su\u1ea5t c\u01a1 h\u1ecdc l\u1edbn:<\/strong> \u1ee8ng su\u1ea5t c\u01a1 h\u1ecdc v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n c\u00f3 th\u1ec3 ph\u00e1 v\u1ee1 c\u1ea5u tr\u00fac ph\u00e2n c\u1ef1c.<\/li>\n<\/ul>\n<h3>H\u1eadu qu\u1ea3 c\u1ee7a kh\u1eed ph\u00e2n c\u1ef1c<\/h3>\n<p>Kh\u1eed ph\u00e2n c\u1ef1c l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 hi\u1ec7u su\u1ea5t c\u1ee7a thi\u1ebft b\u1ecb \u00e1p \u0111i\u1ec7n, th\u1eadm ch\u00ed c\u00f3 th\u1ec3 khi\u1ebfn thi\u1ebft b\u1ecb ng\u1eebng ho\u1ea1t \u0111\u1ed9ng ho\u00e0n to\u00e0n.  Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 g\u00e2y ra kh\u1eed ph\u00e2n c\u1ef1c l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o tu\u1ed5i th\u1ecd v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u00e1p \u0111i\u1ec7n.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Nguy\u00ean nh\u00e2n<\/th>\n<th>H\u1eadu qu\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Nhi\u1ec7t \u0111\u1ed9 cao<\/td>\n<td>M\u1ea5t ph\u00e2n c\u1ef1c ho\u00e0n to\u00e0n<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec7n tr\u01b0\u1eddng m\u1ea1nh ng\u01b0\u1ee3c chi\u1ec1u<\/td>\n<td>\u0110\u1ea3o ng\u01b0\u1ee3c ho\u1eb7c gi\u1ea3m ph\u00e2n c\u1ef1c<\/td>\n<\/tr>\n<tr>\n<td>\u1ee8ng su\u1ea5t c\u01a1 h\u1ecdc l\u1edbn<\/td>\n<td>Ph\u00e1 v\u1ee1 c\u1ea5u tr\u00fac ph\u00e2n c\u1ef1c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a poling v\u00e0 depoling trong thi\u1ebft b\u1ecb si\u00eau \u00e2m<\/h3>\n<p>Trong l\u0129nh v\u1ef1c si\u00eau \u00e2m, vi\u1ec7c ki\u1ec3m so\u00e1t qu\u00e1 tr\u00ecnh poling v\u00e0 depoling c\u00f3 vai tr\u00f2 quan tr\u1ecdng. V\u00ed d\u1ee5, trong c\u00e1c \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m, v\u1eadt li\u1ec7u piezoceramic \u0111\u01b0\u1ee3c ph\u00e2n c\u1ef1c c\u1ea9n th\u1eadn \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng.  Vi\u1ec7c tr\u00e1nh depoling l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a thi\u1ebft b\u1ecb.<\/p>\n<p>T\u00f3m l\u1ea1i, poling v\u00e0 depoling l\u00e0 hai qu\u00e1 tr\u00ecnh quan tr\u1ecdng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u piezoceramic.  Ki\u1ec3m so\u00e1t c\u00e1c qu\u00e1 tr\u00ecnh n\u00e0y l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a thi\u1ebft k\u1ebf v\u00e0 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u00e1p \u0111i\u1ec7n trong nhi\u1ec1u \u1ee9ng d\u1ee5ng kh\u00e1c nhau, t\u1eeb c\u1ea3m bi\u1ebfn \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb truy\u1ec1n \u0111\u1ed9ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n g\u1ed1m (piezoceramic) c\u00f3 kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc th\u00e0nh n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n n\u00e0y ph\u1ee5 thu\u1ed9c m\u1ea1nh m\u1ebd v\u00e0o s\u1ef1 ph\u00e2n c\u1ef1c c\u1ee7a v\u1eadt li\u1ec7u, m\u1ed9t qu\u00e1 tr\u00ecnh s\u1eafp x\u1ebfp c\u00e1c dipole \u0111i\u1ec7n b\u00ean trong v\u1eadt li\u1ec7u theo m\u1ed9t h\u01b0\u1edbng c\u1ee5 th\u1ec3.<\/p>\n","protected":false},"author":1,"featured_media":4869,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-54221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/54221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/comments?post=54221"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/54221\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/4869"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=54221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=54221"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=54221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}