{"id":43836,"date":"2023-04-25T16:49:17","date_gmt":"2023-04-25T21:49:17","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/what-are-ultrasonic-transducers\/"},"modified":"2025-01-21T07:27:09","modified_gmt":"2025-01-21T12:27:09","slug":"what-are-ultrasonic-transducers","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/what-are-ultrasonic-transducers\/","title":{"rendered":"Kh\u00e1m ph\u00e1 th\u1ebf gi\u1edbi \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m"},"content":{"rendered":"<p>Si\u00eau \u00e2m l\u00e0 s\u00f3ng \u00e2m thanh c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, th\u01b0\u1eddng tr\u00ean 20kHz. \u0110\u1ec3 t\u1ea1o ra v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c nh\u1eefng s\u00f3ng \u00e2m n\u00e0y, ch\u00fang ta c\u1ea7n \u0111\u1ebfn m\u1ed9t thi\u1ebft b\u1ecb \u0111\u1eb7c bi\u1ec7t g\u1ecdi l\u00e0 \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m. V\u1eady \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 g\u00ec v\u00e0 ch\u00fang ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o? B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o t\u00ecm hi\u1ec3u v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng, c\u00e1c lo\u1ea1i v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m.<\/p>\n<h3>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m<\/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 cho ph\u00e9p m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u nh\u1ea5t \u0111\u1ecbnh, ch\u1eb3ng h\u1ea1n nh\u01b0 g\u1ed1m \u00e1p \u0111i\u1ec7n, bi\u1ebfn \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n th\u00e0nh n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc d\u01b0\u1edbi d\u1ea1ng s\u00f3ng \u00e2m v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Khi m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o \u0111\u1ea7u d\u00f2, v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n s\u1ebd dao \u0111\u1ed9ng v\u00e0 t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m. Ng\u01b0\u1ee3c l\u1ea1i, khi s\u00f3ng si\u00eau \u00e2m t\u00e1c \u0111\u1ed9ng v\u00e0o \u0111\u1ea7u d\u00f2, n\u00f3 s\u1ebd t\u1ea1o ra m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u.<\/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, \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean t\u1ea7n s\u1ed1, h\u00ecnh d\u1ea1ng, v\u00e0 \u1ee9ng d\u1ee5ng. M\u1ed9t s\u1ed1 lo\u1ea1i ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>\u0110\u1ea7u d\u00f2 ti\u1ebfp x\u00fac:<\/strong> \u0110\u00e2y l\u00e0 lo\u1ea1i \u0111\u1ea7u d\u00f2 ph\u1ed5 bi\u1ebfn nh\u1ea5t, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 ki\u1ec3m tra khuy\u1ebft t\u1eadt, \u0111o \u0111\u1ed9 d\u00e0y, v\u00e0 h\u00ecnh \u1ea3nh y t\u1ebf. Ch\u00fang ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi v\u1eadt th\u1ec3 c\u1ea7n ki\u1ec3m tra.<\/li>\n<li><strong>\u0110\u1ea7u d\u00f2 kh\u00f4ng ti\u1ebfp x\u00fac:<\/strong> Lo\u1ea1i \u0111\u1ea7u d\u00f2 n\u00e0y s\u1eed d\u1ee5ng m\u1ed9t m\u00f4i tr\u01b0\u1eddng trung gian, ch\u1eb3ng h\u1ea1n nh\u01b0 n\u01b0\u1edbc ho\u1eb7c gel, \u0111\u1ec3 truy\u1ec1n s\u00f3ng si\u00eau \u00e2m. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c cao ho\u1eb7c khi ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp kh\u00f4ng kh\u1ea3 thi.<\/li>\n<li><strong>\u0110\u1ea7u d\u00f2 m\u1ea3ng pha:<\/strong> \u0110\u1ea7u d\u00f2 n\u00e0y g\u1ed3m nhi\u1ec1u ph\u1ea7n t\u1eed \u00e1p \u0111i\u1ec7n nh\u1ecf, cho ph\u00e9p \u0111i\u1ec1u khi\u1ec3n h\u01b0\u1edbng v\u00e0 ti\u00eau \u0111i\u1ec3m c\u1ee7a ch\u00f9m tia si\u00eau \u00e2m. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong h\u00ecnh \u1ea3nh y t\u1ebf v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng ki\u1ec3m tra kh\u00f4ng ph\u00e1 h\u1ee7y ti\u00ean ti\u1ebfn.<\/li>\n<\/ul>\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 (kHz)<\/th>\n<th>\u1ee8ng d\u1ee5ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ti\u1ebfp x\u00fac<\/td>\n<td>20 &#8211; 10 MHz<\/td>\n<td>Ki\u1ec3m tra khuy\u1ebft t\u1eadt, \u0111o \u0111\u1ed9 d\u00e0y<\/td>\n<\/tr>\n<tr>\n<td>Kh\u00f4ng ti\u1ebfp x\u00fac<\/td>\n<td>1 &#8211; 5 MHz<\/td>\n<td>Ki\u1ec3m tra v\u1eadt li\u1ec7u nh\u1ea1y c\u1ea3m<\/td>\n<\/tr>\n<tr>\n<td>M\u1ea3ng pha<\/td>\n<td>2 &#8211; 10 MHz<\/td>\n<td>H\u00ecnh \u1ea3nh y t\u1ebf, ki\u1ec3m tra NDT ti\u00ean ti\u1ebfn<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m<\/h3>\n<p>\u0110\u1ea7u d\u00f2 si\u00eau \u00e2m \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Y t\u1ebf:<\/strong> Ch\u1ea9n \u0111o\u00e1n h\u00ecnh \u1ea3nh, \u0111i\u1ec1u tr\u1ecb ung th\u01b0, theo d\u00f5i thai nhi.<\/li>\n<li><strong>C\u00f4ng nghi\u1ec7p:<\/strong> Ki\u1ec3m tra khuy\u1ebft t\u1eadt v\u1eadt li\u1ec7u, \u0111o \u0111\u1ed9 d\u00e0y, h\u00e0n si\u00eau \u00e2m, l\u00e0m s\u1ea1ch b\u1eb1ng si\u00eau \u00e2m.<\/li>\n<li><strong>\u00d4 t\u00f4:<\/strong> C\u1ea3m bi\u1ebfn kho\u1ea3ng c\u00e1ch, h\u1ec7 th\u1ed1ng h\u1ed7 tr\u1ee3 \u0111\u1ed7 xe.<\/li>\n<li><strong>Nghi\u00ean c\u1ee9u khoa h\u1ecdc:<\/strong> Nghi\u00ean c\u1ee9u v\u1eadt li\u1ec7u, kh\u1ea3o c\u1ed5 h\u1ecdc.<\/li>\n<\/ul>\n<p>M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb t\u1eeb c\u00e1c nh\u00e0 cung c\u1ea5p nh\u01b0 Beijing Ultrasonic, n\u1ebfu ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt c\u1ee5 th\u1ec3.<\/p>\n<p>T\u00f3m l\u1ea1i, \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb quan tr\u1ecdng trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb y t\u1ebf \u0111\u1ebfn c\u00f4ng nghi\u1ec7p. S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00f4ng ngh\u1ec7 \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m \u0111ang m\u1edf ra nhi\u1ec1u ti\u1ec1m n\u0103ng \u1ee9ng d\u1ee5ng m\u1edbi, h\u1ee9a h\u1eb9n mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch cho cu\u1ed9c s\u1ed1ng con ng\u01b0\u1eddi.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Si\u00eau \u00e2m l\u00e0 s\u00f3ng \u00e2m thanh c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, th\u01b0\u1eddng tr\u00ean 20kHz. \u0110\u1ec3 t\u1ea1o ra v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c nh\u1eefng s\u00f3ng \u00e2m n\u00e0y, ch\u00fang ta c\u1ea7n \u0111\u1ebfn m\u1ed9t thi\u1ebft b\u1ecb \u0111\u1eb7c bi\u1ec7t g\u1ecdi l\u00e0 \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m. V\u1eady \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 g\u00ec v\u00e0 ch\u00fang ho\u1ea1t \u0111\u1ed9ng<\/p>\n","protected":false},"author":1,"featured_media":24649,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-43836","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\/43836","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=43836"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/43836\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/24649"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=43836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=43836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=43836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}