{"id":54414,"date":"2022-08-07T09:08:43","date_gmt":"2022-08-07T14:08:43","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/is-there-one-resonant-frequency-from-a-piezoceramic-sheet\/"},"modified":"2025-01-21T07:25:20","modified_gmt":"2025-01-21T12:25:20","slug":"is-there-one-resonant-frequency-from-a-piezoceramic-sheet","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/is-there-one-resonant-frequency-from-a-piezoceramic-sheet\/","title":{"rendered":"T\u1ea5m g\u1ed1m \u00e1p \u0111i\u1ec7n c\u00f3 duy nh\u1ea5t m\u1ed9t t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng?"},"content":{"rendered":"<p>Mi\u1ebfng g\u1ed1m \u00e1p \u0111i\u1ec7n, v\u1edbi kh\u1ea3 n\u0103ng bi\u1ebfn \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, \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t v\u1eadt li\u1ec7u quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng, t\u1eeb c\u1ea3m bi\u1ebfn \u0111\u1ebfn thi\u1ebft b\u1ecb truy\u1ec1n \u0111\u1ed9ng.  M\u1ed9t c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 \u0111\u1eb7c t\u00ednh c\u1ee7a v\u1eadt li\u1ec7u n\u00e0y l\u00e0 li\u1ec7u m\u1ed9t mi\u1ebfng g\u1ed1m \u00e1p \u0111i\u1ec7n c\u00f3 ch\u1ec9 m\u1ed9t t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng duy nh\u1ea5t hay kh\u00f4ng. C\u00e2u tr\u1ea3 l\u1eddi, tuy ng\u1eafn g\u1ecdn l\u00e0 kh\u00f4ng, l\u1ea1i c\u1ea7n \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch chi ti\u1ebft h\u01a1n \u0111\u1ec3 hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t ph\u1ee9c t\u1ea1p c\u1ee7a dao \u0111\u1ed9ng trong v\u1eadt li\u1ec7u n\u00e0y.<\/p>\n<h3>Dao \u0111\u1ed9ng v\u00e0 ch\u1ebf \u0111\u1ed9 rung<\/h3>\n<p>M\u1ed9t mi\u1ebfng g\u1ed1m \u00e1p \u0111i\u1ec7n c\u00f3 th\u1ec3 dao \u0111\u1ed9ng theo nhi\u1ec1u ch\u1ebf \u0111\u1ed9 kh\u00e1c nhau, ph\u1ee5 thu\u1ed9c v\u00e0o h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc, v\u00e0 c\u00e1ch th\u1ee9c k\u00edch th\u00edch.  M\u1ed7i ch\u1ebf \u0111\u1ed9 rung n\u00e0y t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng ri\u00eang bi\u1ec7t.  Do \u0111\u00f3, m\u1ed9t mi\u1ebfng g\u1ed1m \u00e1p \u0111i\u1ec7n kh\u00f4ng ch\u1ec9 c\u00f3 m\u1ed9t m\u00e0 l\u00e0 nhi\u1ec1u t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng.<\/p>\n<h3>\u1ea2nh h\u01b0\u1edfng c\u1ee7a h\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc<\/h3>\n<p>H\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc c\u1ee7a mi\u1ebfng g\u1ed1m \u00e1p \u0111i\u1ec7n \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng c\u1ee7a n\u00f3. V\u00ed d\u1ee5, m\u1ed9t mi\u1ebfng g\u1ed1m h\u00ecnh tr\u00f2n s\u1ebd c\u00f3 c\u00e1c t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng kh\u00e1c v\u1edbi m\u1ed9t mi\u1ebfng g\u1ed1m h\u00ecnh vu\u00f4ng c\u00f9ng k\u00edch th\u01b0\u1edbc.  T\u01b0\u01a1ng t\u1ef1, m\u1ed9t mi\u1ebfng g\u1ed1m m\u1ecfng s\u1ebd c\u00f3 t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng kh\u00e1c v\u1edbi m\u1ed9t mi\u1ebfng g\u1ed1m d\u00e0y.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>H\u00ecnh d\u1ea1ng<\/th>\n<th>K\u00edch th\u01b0\u1edbc (mm)<\/th>\n<th>V\u00ed d\u1ee5 t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng (kHz)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>H\u00ecnh tr\u00f2n<\/td>\n<td>\u0110\u01b0\u1eddng k\u00ednh 20, \u0110\u1ed9 d\u00e0y 1<\/td>\n<td>100, 250, 500<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh vu\u00f4ng<\/td>\n<td>20 x 20 x 1<\/td>\n<td>120, 280, 550<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh ch\u1eef nh\u1eadt<\/td>\n<td>30 x 10 x 1<\/td>\n<td>80, 200, 400<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>L\u01b0u \u00fd: C\u00e1c gi\u00e1 tr\u1ecb t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng ch\u1ec9 mang t\u00ednh ch\u1ea5t minh h\u1ecda v\u00e0 c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y thu\u1ed9c v\u00e0o v\u1eadt li\u1ec7u c\u1ee5 th\u1ec3.<\/em><\/p>\n<h3>K\u00edch th\u00edch v\u00e0 t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng<\/h3>\n<p>C\u00e1ch th\u1ee9c k\u00edch th\u00edch c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng n\u00e0o s\u1ebd \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t m\u1ea1nh nh\u1ea5t.  N\u1ebfu \u00e1p d\u1ee5ng m\u1ed9t t\u00edn hi\u1ec7u \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 t\u1ea7n s\u1ed1 tr\u00f9ng v\u1edbi m\u1ed9t trong c\u00e1c t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng c\u1ee7a mi\u1ebfng g\u1ed1m, bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 \u0111\u00f3 s\u1ebd \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i \u0111\u00e1ng k\u1ec3.<\/p>\n<h3>T\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng c\u01a1 b\u1ea3n v\u00e0 c\u00e1c h\u1ecda \u00e2m<\/h3>\n<p>Trong s\u1ed1 c\u00e1c t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng, t\u1ea7n s\u1ed1 th\u1ea5p nh\u1ea5t \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng c\u01a1 b\u1ea3n. C\u00e1c t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng cao h\u01a1n l\u00e0 b\u1ed9i s\u1ed1 nguy\u00ean c\u1ee7a t\u1ea7n s\u1ed1 c\u01a1 b\u1ea3n v\u00e0 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e1c h\u1ecda \u00e2m.<\/p>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a nhi\u1ec1u t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng<\/h3>\n<p>Vi\u1ec7c m\u1ed9t mi\u1ebfng g\u1ed1m \u00e1p \u0111i\u1ec7n c\u00f3 nhi\u1ec1u t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t h\u1ea1n ch\u1ebf m\u00e0 ng\u01b0\u1ee3c l\u1ea1i, m\u1edf ra nhi\u1ec1u kh\u1ea3 n\u0103ng \u1ee9ng d\u1ee5ng.  V\u00ed d\u1ee5, trong c\u00e1c \u1ee9ng d\u1ee5ng si\u00eau \u00e2m, vi\u1ec7c l\u1ef1a ch\u1ecdn t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng ph\u00f9 h\u1ee3p cho ph\u00e9p t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t c\u1ee7a thi\u1ebft b\u1ecb. N\u1ebfu c\u1ea7n thi\u1ebft s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb si\u00eau \u00e2m, vi\u1ec7c t\u00ecm hi\u1ec3u c\u00e1c s\u1ea3n ph\u1ea9m t\u1eeb c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t uy t\u00edn nh\u01b0 Beijing Ultrasonic c\u00f3 th\u1ec3 h\u1eefu \u00edch cho vi\u1ec7c l\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb ph\u00f9 h\u1ee3p.<\/p>\n<p>T\u00f3m l\u1ea1i, m\u1ed9t mi\u1ebfng g\u1ed1m \u00e1p \u0111i\u1ec7n kh\u00f4ng c\u00f3 ch\u1ec9 m\u1ed9t m\u00e0 l\u00e0 nhi\u1ec1u t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng, ph\u1ee5 thu\u1ed9c v\u00e0o h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc, v\u00e0 c\u00e1ch th\u1ee9c k\u00edch th\u00edch.  Hi\u1ec3u r\u00f5 v\u1ec1 c\u00e1c t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 thi\u1ebft k\u1ebf v\u00e0 s\u1eed d\u1ee5ng hi\u1ec7u qu\u1ea3 c\u00e1c \u1ee9ng d\u1ee5ng d\u1ef1a tr\u00ean g\u1ed1m \u00e1p \u0111i\u1ec7n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mi\u1ebfng g\u1ed1m \u00e1p \u0111i\u1ec7n, v\u1edbi kh\u1ea3 n\u0103ng bi\u1ebfn \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, \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t v\u1eadt li\u1ec7u quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng, t\u1eeb c\u1ea3m bi\u1ebfn \u0111\u1ebfn thi\u1ebft b\u1ecb truy\u1ec1n \u0111\u1ed9ng. M\u1ed9t c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 \u0111\u1eb7c t\u00ednh c\u1ee7a v\u1eadt li\u1ec7u n\u00e0y l\u00e0 li\u1ec7u m\u1ed9t<\/p>\n","protected":false},"author":1,"featured_media":18820,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-54414","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\/54414","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=54414"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/54414\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/18820"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=54414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=54414"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=54414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}