{"id":49380,"date":"2023-04-21T22:20:45","date_gmt":"2023-04-22T03:20:45","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-generate-high-frequency-sound-waves\/"},"modified":"2025-01-21T07:16:08","modified_gmt":"2025-01-21T12:16:08","slug":"how-to-generate-high-frequency-sound-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-generate-high-frequency-sound-waves\/","title":{"rendered":"K\u1ef9 thu\u1eadt t\u1ea1o s\u00f3ng \u00e2m t\u1ea7n s\u1ed1 cao hi\u1ec7u qu\u1ea3"},"content":{"rendered":"<p>\u00c2m thanh cao t\u1ea7n, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 si\u00eau \u00e2m, c\u00f3 t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n nghe c\u1ee7a con ng\u01b0\u1eddi, t\u1ee9c l\u00e0 tr\u00ean 20kHz. Vi\u1ec7c t\u1ea1o ra \u00e2m thanh \u1edf d\u1ea3i t\u1ea7n s\u1ed1 n\u00e0y c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong y t\u1ebf, c\u00f4ng nghi\u1ec7p v\u00e0 nghi\u00ean c\u1ee9u khoa h\u1ecdc. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd tr\u00ecnh b\u00e0y chi ti\u1ebft c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o ra s\u00f3ng \u00e2m cao t\u1ea7n.<\/p>\n<h3>Ph\u01b0\u01a1ng ph\u00e1p \u00e1p \u0111i\u1ec7n<\/h3>\n<p>Ph\u01b0\u01a1ng ph\u00e1p \u00e1p \u0111i\u1ec7n d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n, t\u1ee9c l\u00e0 kh\u1ea3 n\u0103ng c\u1ee7a m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u (nh\u01b0 th\u1ea1ch anh, g\u1ed1m \u00e1p \u0111i\u1ec7n) t\u1ea1o ra \u0111i\u1ec7n \u00e1p khi b\u1ecb n\u00e9n ho\u1eb7c gi\u00e3n n\u1edf, v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, bi\u1ebfn d\u1ea1ng khi \u0111\u1eb7t d\u01b0\u1edbi \u0111i\u1ec7n \u00e1p.  \u0110\u1ec3 t\u1ea1o ra si\u00eau \u00e2m, m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u cao t\u1ea7n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n. S\u1ef1 thay \u0111\u1ed5i \u0111i\u1ec7n \u00e1p n\u00e0y l\u00e0m cho v\u1eadt li\u1ec7u dao \u0111\u1ed9ng, t\u1ea1o ra s\u00f3ng \u00e2m \u1edf c\u00f9ng t\u1ea7n s\u1ed1.<\/p>\n<h3>Ph\u01b0\u01a1ng ph\u00e1p t\u1eeb gi magnetostriction<\/h3>\n<p>T\u01b0\u01a1ng t\u1ef1 nh\u01b0 hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n, hi\u1ec7u \u1ee9ng t\u1eeb gi x\u1ea3y ra \u1edf m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u t\u1eeb t\u00ednh. Khi \u0111\u1eb7t trong m\u1ed9t t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean, v\u1eadt li\u1ec7u n\u00e0y s\u1ebd thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc, t\u1ea1o ra s\u00f3ng \u00e2m. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra si\u00eau \u00e2m \u1edf t\u1ea7n s\u1ed1 th\u1ea5p h\u01a1n so v\u1edbi ph\u01b0\u01a1ng ph\u00e1p \u00e1p \u0111i\u1ec7n.<\/p>\n<h3>Ph\u01b0\u01a1ng ph\u00e1p s\u1eed d\u1ee5ng m\u1ea1ch \u0111i\u1ec7n t\u1eed<\/h3>\n<p>C\u00e1c m\u1ea1ch \u0111i\u1ec7n t\u1eed, \u0111\u1eb7c bi\u1ec7t l\u00e0 m\u1ea1ch dao \u0111\u1ed9ng, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra t\u00edn hi\u1ec7u \u0111i\u1ec7n cao t\u1ea7n. T\u00edn hi\u1ec7u n\u00e0y sau \u0111\u00f3 \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i v\u00e0 \u0111\u01b0a v\u00e0o m\u1ed9t b\u1ed9 chuy\u1ec3n \u0111\u1ed5i (transducer) nh\u01b0 loa \u00e1p \u0111i\u1ec7n \u0111\u1ec3 t\u1ea1o ra s\u00f3ng \u00e2m.  Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y cho ph\u00e9p ki\u1ec3m so\u00e1t t\u1ed1t t\u1ea7n s\u1ed1 v\u00e0 bi\u00ean \u0111\u1ed9 c\u1ee7a s\u00f3ng \u00e2m.<\/p>\n<h3>So s\u00e1nh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p<\/h3>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Ph\u01b0\u01a1ng ph\u00e1p<\/th>\n<th>T\u1ea7n s\u1ed1<\/th>\n<th>Hi\u1ec7u su\u1ea5t<\/th>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u00c1p \u0111i\u1ec7n<\/td>\n<td>Cao (l\u00ean \u0111\u1ebfn GHz)<\/td>\n<td>Cao<\/td>\n<td>K\u00edch th\u01b0\u1edbc nh\u1ecf g\u1ecdn, d\u1ec5 \u0111i\u1ec1u khi\u1ec3n<\/td>\n<td>Gi\u00e1 th\u00e0nh cao h\u01a1n \u1edf t\u1ea7n s\u1ed1 r\u1ea5t cao<\/td>\n<\/tr>\n<tr>\n<td>T\u1eeb gi<\/td>\n<td>Th\u1ea5p \u0111\u1ebfn trung b\u00ecnh<\/td>\n<td>Trung b\u00ecnh<\/td>\n<td>\u0110\u1ed9 b\u1ec1n cao<\/td>\n<td>K\u00edch th\u01b0\u1edbc l\u1edbn h\u01a1n, kh\u00f3 \u0111i\u1ec1u khi\u1ec3n t\u1ea7n s\u1ed1 cao<\/td>\n<\/tr>\n<tr>\n<td>M\u1ea1ch \u0111i\u1ec7n t\u1eed<\/td>\n<td>R\u1ed9ng<\/td>\n<td>Ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ea1ch v\u00e0 transducer<\/td>\n<td>Linh ho\u1ea1t, d\u1ec5 \u0111i\u1ec1u ch\u1ec9nh<\/td>\n<td>\u0110\u1ed9 ph\u1ee9c t\u1ea1p cao h\u01a1n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a s\u00f3ng \u00e2m cao t\u1ea7n<\/h3>\n<p>S\u00f3ng \u00e2m cao t\u1ea7n c\u00f3 r\u1ea5t nhi\u1ec1u \u1ee9ng d\u1ee5ng trong cu\u1ed9c s\u1ed1ng, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Y t\u1ebf:<\/strong>  Si\u00eau \u00e2m ch\u1ea9n \u0111o\u00e1n h\u00ecnh \u1ea3nh, \u0111i\u1ec1u tr\u1ecb s\u1ecfi th\u1eadn, v\u1eadt l\u00fd tr\u1ecb li\u1ec7u.<\/li>\n<li><strong>C\u00f4ng nghi\u1ec7p:<\/strong> H\u00e0n si\u00eau \u00e2m, l\u00e0m s\u1ea1ch b\u1ec1 m\u1eb7t, ki\u1ec3m tra khuy\u1ebft t\u1eadt v\u1eadt li\u1ec7u.<\/li>\n<li><strong>Nghi\u00ean c\u1ee9u khoa h\u1ecdc:<\/strong>  S\u1eed d\u1ee5ng trong c\u00e1c th\u00ed nghi\u1ec7m v\u1eadt l\u00fd, h\u00f3a h\u1ecdc v\u00e0 sinh h\u1ecdc.<\/li>\n<\/ul>\n<p>Vi\u1ec7c t\u1ea1o ra s\u00f3ng \u00e2m cao t\u1ea7n \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 c\u00e1c nguy\u00ean l\u00fd v\u1eadt l\u00fd v\u00e0 k\u1ef9 thu\u1eadt \u0111i\u1ec7n t\u1eed.  M\u1ed7i ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec1u c\u00f3 \u01b0u \u0111i\u1ec3m v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m ri\u00eang, vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 v\u00e0 y\u00eau c\u1ea7u v\u1ec1 t\u1ea7n s\u1ed1, c\u00f4ng su\u1ea5t v\u00e0 chi ph\u00ed.  S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00f4ng ngh\u1ec7 v\u1eadt li\u1ec7u v\u00e0 \u0111i\u1ec7n t\u1eed \u0111ang m\u1edf ra nh\u1eefng kh\u1ea3 n\u0103ng m\u1edbi trong vi\u1ec7c t\u1ea1o ra v\u00e0 \u1ee9ng d\u1ee5ng s\u00f3ng \u00e2m cao t\u1ea7n, h\u1ee9a h\u1eb9n nhi\u1ec1u \u0111\u1ed9t ph\u00e1 trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00c2m thanh cao t\u1ea7n, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 si\u00eau \u00e2m, c\u00f3 t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n nghe c\u1ee7a con ng\u01b0\u1eddi, t\u1ee9c l\u00e0 tr\u00ean 20kHz. Vi\u1ec7c t\u1ea1o ra \u00e2m thanh \u1edf d\u1ea3i t\u1ea7n s\u1ed1 n\u00e0y c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong y t\u1ebf, c\u00f4ng nghi\u1ec7p v\u00e0 nghi\u00ean c\u1ee9u khoa h\u1ecdc. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd<\/p>\n","protected":false},"author":1,"featured_media":26471,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-49380","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\/49380","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=49380"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/49380\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26471"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=49380"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=49380"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=49380"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}