{"id":49604,"date":"2023-04-21T15:54:09","date_gmt":"2023-04-21T20:54:09","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-create-ultrasonic-waves\/"},"modified":"2025-01-21T07:15:28","modified_gmt":"2025-01-21T12:15:28","slug":"how-to-create-ultrasonic-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-create-ultrasonic-waves\/","title":{"rendered":"T\u1ea1o s\u00f3ng si\u00eau \u00e2m: Ph\u01b0\u01a1ng ph\u00e1p v\u00e0 \u1ee9ng d\u1ee5ng"},"content":{"rendered":"<p>S\u00f3ng si\u00eau \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi (tr\u00ean 20kHz), \u0111\u00e3 v\u00e0 \u0111ang \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c t\u1eeb y t\u1ebf, c\u00f4ng nghi\u1ec7p \u0111\u1ebfn \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y. Vi\u1ec7c t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi nh\u1eefng k\u1ef9 thu\u1eadt \u0111\u1eb7c bi\u1ec7t v\u00e0 s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 nguy\u00ean l\u00fd v\u1eadt l\u00fd. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m, c\u00f9ng v\u1edbi \u01b0u nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a t\u1eebng ph\u01b0\u01a1ng ph\u00e1p.<\/p>\n<h3>S\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n<\/h3>\n<p>Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n l\u00e0 m\u1ed9t trong nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u1ec3 t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m.  Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean vi\u1ec7c m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u g\u1ed1m s\u1ee9 (nh\u01b0 th\u1ea1ch anh, PZT) c\u00f3 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. Khi \u0111\u1eb7t m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u v\u00e0o v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, n\u00f3 s\u1ebd dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 c\u1ee7a \u0111i\u1ec7n \u00e1p, t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m. T\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng si\u00eau \u00e2m \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i t\u1ea7n s\u1ed1 c\u1ee7a \u0111i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Hi\u1ec7u su\u1ea5t cao<\/td>\n<td>\u0110\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc h\u1ea1n ch\u1ebf \u1edf t\u1ea7n s\u1ed1 cao<\/td>\n<\/tr>\n<tr>\n<td>K\u00edch th\u01b0\u1edbc nh\u1ecf g\u1ecdn<\/td>\n<td>D\u1ec5 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec7t \u0111\u1ed9<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec1u khi\u1ec3n t\u1ea7n s\u1ed1 d\u1ec5 d\u00e0ng<\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>S\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o<\/h3>\n<p>Hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o x\u1ea3y ra khi m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u s\u1eaft t\u1eeb thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc d\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a t\u1eeb tr\u01b0\u1eddng.  B\u1eb1ng c\u00e1ch \u0111\u1eb7t m\u1ed9t cu\u1ed9n d\u00e2y xung quanh m\u1ed9t v\u1eadt li\u1ec7u t\u1eeb gi\u1ea3o v\u00e0 cho d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u ch\u1ea1y qua, ta c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean, l\u00e0m v\u1eadt li\u1ec7u dao \u0111\u1ed9ng v\u00e0 t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u00f4ng su\u1ea5t l\u1edbn<\/td>\n<td>Hi\u1ec7u su\u1ea5t th\u1ea5p h\u01a1n so v\u1edbi \u00e1p \u0111i\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc t\u1ed1t<\/td>\n<td>K\u00edch th\u01b0\u1edbc l\u1edbn h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>Kh\u1ea3 n\u0103ng ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 th\u1ea5p<\/td>\n<td>\u0110i\u1ec1u khi\u1ec3n t\u1ea7n s\u1ed1 ph\u1ee9c t\u1ea1p h\u01a1n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>S\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng \u0111i\u1ec7n gi\u1ea3o<\/h3>\n<p>Hi\u1ec7u \u1ee9ng \u0111i\u1ec7n gi\u1ea3o t\u01b0\u01a1ng t\u1ef1 nh\u01b0 hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o, nh\u01b0ng s\u1eed d\u1ee5ng \u0111i\u1ec7n tr\u01b0\u1eddng thay v\u00ec t\u1eeb tr\u01b0\u1eddng. M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u \u0111i\u1ec7n m\u00f4i s\u1ebd thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc khi \u0111\u1eb7t trong \u0111i\u1ec7n tr\u01b0\u1eddng bi\u1ebfn thi\u00ean. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n so v\u1edbi hai ph\u01b0\u01a1ng ph\u00e1p tr\u00ean do hi\u1ec7u su\u1ea5t th\u1ea5p v\u00e0 y\u00eau c\u1ea7u \u0111i\u1ec7n \u00e1p cao.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u1ea3i t\u1ea7n s\u1ed1 r\u1ed9ng<\/td>\n<td>Hi\u1ec7u su\u1ea5t th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>Y\u00eau c\u1ea7u \u0111i\u1ec7n \u00e1p cao<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>S\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng quang \u00e2m<\/h3>\n<p>Hi\u1ec7u \u1ee9ng quang \u00e2m l\u00e0 vi\u1ec7c t\u1ea1o ra s\u00f3ng \u00e2m thanh b\u1eb1ng c\u00e1ch chi\u1ebfu ch\u00f9m tia laser xung c\u1ef1c ng\u1eafn v\u00e0o m\u1ed9t v\u1eadt li\u1ec7u h\u1ea5p th\u1ee5.  Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m v\u1edbi t\u1ea7n s\u1ed1 r\u1ea5t cao, \u1ee9ng d\u1ee5ng trong nghi\u00ean c\u1ee9u khoa h\u1ecdc v\u00e0 ki\u1ec3m tra v\u1eadt li\u1ec7u.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>T\u1ea1o ra s\u00f3ng si\u00eau \u00e2m t\u1ea7n s\u1ed1 r\u1ea5t cao<\/td>\n<td>Chi ph\u00ed cao<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9 ch\u00ednh x\u00e1c cao<\/td>\n<td>C\u1ea7n thi\u1ebft b\u1ecb ph\u1ee9c t\u1ea1p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o s\u00f3ng si\u00eau \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3. Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi k\u00edch th\u01b0\u1edbc nh\u1ecf g\u1ecdn v\u00e0 hi\u1ec7u su\u1ea5t cao, trong khi hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea7n c\u00f4ng su\u1ea5t l\u1edbn.  Hi\u1ec7u \u1ee9ng quang \u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng nghi\u00ean c\u1ee9u v\u00e0 ki\u1ec3m tra v\u1eadt li\u1ec7u \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c cao v\u00e0 t\u1ea7n s\u1ed1 si\u00eau \u00e2m r\u1ea5t cao.  S\u1ef1 ph\u00e1t tri\u1ec3n c\u00f4ng ngh\u1ec7 v\u1eadt li\u1ec7u v\u00e0 k\u1ef9 thu\u1eadt \u0111i\u1ec7n t\u1eed s\u1ebd ti\u1ebfp t\u1ee5c c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 m\u1edf r\u1ed9ng \u1ee9ng d\u1ee5ng c\u1ee7a s\u00f3ng si\u00eau \u00e2m trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u00f3ng si\u00eau \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi (tr\u00ean 20kHz), \u0111\u00e3 v\u00e0 \u0111ang \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c t\u1eeb y t\u1ebf, c\u00f4ng nghi\u1ec7p \u0111\u1ebfn \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y. Vi\u1ec7c t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi nh\u1eefng k\u1ef9 thu\u1eadt \u0111\u1eb7c bi\u1ec7t v\u00e0 s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1<\/p>\n","protected":false},"author":1,"featured_media":26473,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-49604","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\/49604","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=49604"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/49604\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26473"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=49604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=49604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=49604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}