{"id":50748,"date":"2023-04-21T14:32:52","date_gmt":"2023-04-21T19:32:52","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-does-an-ultrasonic-transducer-work\/"},"modified":"2025-01-21T07:12:21","modified_gmt":"2025-01-21T12:12:21","slug":"how-does-an-ultrasonic-transducer-work","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-does-an-ultrasonic-transducer-work\/","title":{"rendered":"Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m"},"content":{"rendered":"<p>Si\u00eau \u00e2m \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong nhi\u1ec1u \u1ee9ng d\u1ee5ng, t\u1eeb y t\u1ebf \u0111\u1ebfn c\u00f4ng nghi\u1ec7p. V\u1eady si\u00eau \u00e2m \u0111\u01b0\u1ee3c t\u1ea1o ra nh\u01b0 th\u1ebf n\u00e0o? C\u00e2u tr\u1ea3 l\u1eddi n\u1eb1m \u1edf b\u1ed9 ph\u1eadn quan tr\u1ecdng g\u1ecdi l\u00e0 \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m, gi\u1ea3i th\u00edch c\u00e1ch th\u1ee9c ch\u00fang t\u1ea1o ra v\u00e0 ph\u00e1t hi\u1ec7n s\u00f3ng \u00e2m \u1edf t\u1ea7n s\u1ed1 cao.<\/p>\n<h3>Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n v\u00e0 vai tr\u00f2 c\u1ee7a n\u00f3<\/h3>\n<p>\u0110\u1ea7u d\u00f2 si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n. Hi\u1ec7u \u1ee9ng n\u00e0y m\u00f4 t\u1ea3 kh\u1ea3 n\u0103ng c\u1ee7a m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u, nh\u01b0 g\u1ed1m \u00e1p \u0111i\u1ec7n (th\u01b0\u1eddng l\u00e0 PZT &#8211; ch\u00ec zirconat titanat), bi\u1ebfn \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n th\u00e0nh n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc (s\u00f3ng \u00e2m) v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.  Khi m\u1ed9t \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, n\u00f3 s\u1ebd thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng, t\u1ea1o ra s\u1ef1 rung \u0111\u1ed9ng.  Ng\u01b0\u1ee3c l\u1ea1i, khi v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n b\u1ecb rung \u0111\u1ed9ng b\u1edfi s\u00f3ng \u00e2m, n\u00f3 s\u1ebd t\u1ea1o ra m\u1ed9t \u0111i\u1ec7n \u00e1p.<\/p>\n<h3>C\u1ea5u t\u1ea1o c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m<\/h3>\n<p>M\u1ed9t \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m \u0111i\u1ec3n h\u00ecnh bao g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh sau:<\/p>\n<ul>\n<li><strong>V\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n:<\/strong> \u0110\u00e2y l\u00e0 th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i, ch\u1ecbu tr\u00e1ch nhi\u1ec7m t\u1ea1o ra v\u00e0 ph\u00e1t hi\u1ec7n s\u00f3ng si\u00eau \u00e2m.<\/li>\n<li><strong>\u0110i\u1ec7n c\u1ef1c:<\/strong>  Hai \u0111i\u1ec7n c\u1ef1c \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf hai m\u1eb7t c\u1ee7a v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n \u0111\u1ec3 \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p v\u00e0 thu t\u00edn hi\u1ec7u \u0111i\u1ec7n.<\/li>\n<li><strong>L\u1edbp k\u1ebft h\u1ee3p:<\/strong> L\u1edbp n\u00e0y \u0111\u01b0\u1ee3c \u0111\u1eb7t ph\u00eda tr\u01b0\u1edbc v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c truy\u1ec1n s\u00f3ng si\u00eau \u00e2m v\u00e0o m\u00f4i tr\u01b0\u1eddng c\u1ea7n ki\u1ec3m tra.<\/li>\n<li><strong>V\u1ecf b\u1ea3o v\u1ec7:<\/strong>  V\u1ecf b\u1ea3o v\u1ec7 bao b\u1ecdc c\u00e1c th\u00e0nh ph\u1ea7n b\u00ean trong, gi\u00fap b\u1ea3o v\u1ec7 \u0111\u1ea7u d\u00f2 kh\u1ecfi c\u00e1c t\u00e1c \u0111\u1ed9ng t\u1eeb m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i.<\/li>\n<li><strong>D\u00e2y d\u1eabn:<\/strong> D\u00e2y d\u1eabn k\u1ebft n\u1ed1i \u0111\u1ea7u d\u00f2 v\u1edbi m\u00e1y ph\u00e1t v\u00e0 thu t\u00edn hi\u1ec7u si\u00eau \u00e2m.<\/li>\n<\/ul>\n<h3>Qu\u00e1 tr\u00ecnh t\u1ea1o s\u00f3ng si\u00eau \u00e2m<\/h3>\n<p>Khi m\u1ed9t xung \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o \u0111i\u1ec7n c\u1ef1c c\u1ee7a v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, n\u00f3 s\u1ebd l\u00e0m v\u1eadt li\u1ec7u n\u00e0y co l\u1ea1i ho\u1eb7c gi\u00e3n n\u1edf, t\u1ea1o ra s\u00f3ng \u00e2m. T\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng \u00e2m \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi t\u1ea7n s\u1ed1 c\u1ee7a xung \u0111i\u1ec7n \u00e1p.<\/p>\n<h3>Qu\u00e1 tr\u00ecnh nh\u1eadn s\u00f3ng si\u00eau \u00e2m<\/h3>\n<p>Khi s\u00f3ng si\u00eau \u00e2m ph\u1ea3n x\u1ea1 t\u1eeb b\u1ec1 m\u1eb7t ho\u1eb7c v\u1eadt th\u1ec3 b\u00ean trong m\u00f4i tr\u01b0\u1eddng c\u1ea7n ki\u1ec3m tra, ch\u00fang quay tr\u1edf l\u1ea1i \u0111\u1ea7u d\u00f2. S\u00f3ng \u00e2m n\u00e0y l\u00e0m rung \u0111\u1ed9ng v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, t\u1ea1o ra m\u1ed9t \u0111i\u1ec7n \u00e1p nh\u1ecf. \u0110i\u1ec7n \u00e1p n\u00e0y \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i v\u00e0 x\u1eed l\u00fd \u0111\u1ec3 t\u1ea1o ra h\u00ecnh \u1ea3nh ho\u1eb7c d\u1eef li\u1ec7u \u0111o l\u01b0\u1eddng.<\/p>\n<h3>C\u00e1c lo\u1ea1i \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m<\/h3>\n<p>C\u00f3 nhi\u1ec1u lo\u1ea1i \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m kh\u00e1c nhau, m\u1ed7i lo\u1ea1i \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3. M\u1ed9t s\u1ed1 lo\u1ea1i ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Lo\u1ea1i \u0111\u1ea7u d\u00f2<\/th>\n<th>T\u1ea7n s\u1ed1<\/th>\n<th>\u1ee8ng d\u1ee5ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>T\u1ea7n s\u1ed1 cao<\/td>\n<td>&gt; 10 MHz<\/td>\n<td>Ki\u1ec3m tra v\u1eadt li\u1ec7u, y t\u1ebf (si\u00eau \u00e2m thai nhi, tim m\u1ea1ch)<\/td>\n<\/tr>\n<tr>\n<td>T\u1ea7n s\u1ed1 th\u1ea5p<\/td>\n<td>&lt; 5 MHz<\/td>\n<td>Ki\u1ec3m tra m\u1ed1i h\u00e0n, \u0111o \u0111\u1ed9 d\u00e0y<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ea7u d\u00f2 m\u1ea3ng pha<\/td>\n<td>Thay \u0111\u1ed5i<\/td>\n<td>T\u1ea1o h\u00ecnh \u1ea3nh 3D, 4D<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>T\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t c\u1ee7a \u0111\u1ea7u d\u00f2<\/h3>\n<p>Hi\u1ec7u su\u1ea5t c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m t\u1ea7n s\u1ed1, k\u00edch th\u01b0\u1edbc, v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n v\u00e0 l\u1edbp k\u1ebft h\u1ee3p. Vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111\u1ea7u d\u00f2 ph\u00f9 h\u1ee3p v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c v\u00e0 \u0111\u00e1ng tin c\u1eady.<\/p>\n<p>T\u00f3m l\u1ea1i, \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb ph\u1ee9c t\u1ea1p ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n.  S\u1ef1 chuy\u1ec3n \u0111\u1ed5i gi\u1eefa n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n v\u00e0 n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc cho ph\u00e9p ch\u00fang t\u1ea1o ra v\u00e0 ph\u00e1t hi\u1ec7n s\u00f3ng si\u00eau \u00e2m, m\u1edf ra c\u00e1nh c\u1eeda cho v\u00f4 s\u1ed1 \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau.  Hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 khai th\u00e1c t\u1ed1i \u0111a ti\u1ec1m n\u0103ng c\u1ee7a c\u00f4ng ngh\u1ec7 n\u00e0y.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Si\u00eau \u00e2m \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong nhi\u1ec1u \u1ee9ng d\u1ee5ng, t\u1eeb y t\u1ebf \u0111\u1ebfn c\u00f4ng nghi\u1ec7p. V\u1eady si\u00eau \u00e2m \u0111\u01b0\u1ee3c t\u1ea1o ra nh\u01b0 th\u1ebf n\u00e0o? C\u00e2u tr\u1ea3 l\u1eddi n\u1eb1m \u1edf b\u1ed9 ph\u1eadn quan tr\u1ecdng g\u1ecdi l\u00e0 \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<\/p>\n","protected":false},"author":1,"featured_media":19415,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-50748","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\/50748","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=50748"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/50748\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/19415"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=50748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=50748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=50748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}