{"id":51028,"date":"2023-04-21T14:15:59","date_gmt":"2023-04-21T19:15:59","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-do-ultrasonic-transducers-work\/"},"modified":"2025-01-21T07:11:40","modified_gmt":"2025-01-21T12:11:40","slug":"how-do-ultrasonic-transducers-work","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-do-ultrasonic-transducers-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, m\u1ed9t lo\u1ea1i s\u00f3ng \u00e2m thanh c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, \u0111\u00e3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb y t\u1ebf \u0111\u1ebfn c\u00f4ng nghi\u1ec7p. Trung t\u00e2m c\u1ee7a nh\u1eefng \u1ee9ng d\u1ee5ng n\u00e0y ch\u00ednh l\u00e0 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m, m\u1ed9t thi\u1ebft b\u1ecb c\u00f3 kh\u1ea3 n\u0103ng chuy\u1ec3n \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 si\u00eau \u00e2m v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. V\u1eady ch\u00ednh x\u00e1c th\u00ec b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o? B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a lo\u1ea1i thi\u1ebft b\u1ecb quan tr\u1ecdng n\u00e0y.<\/p>\n<h3>Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n<\/h3>\n<p>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a h\u1ea7u h\u1ebft c\u00e1c b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m 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\u1ea5t \u0111\u1ecbnh, nh\u01b0 g\u1ed1m \u00e1p \u0111i\u1ec7n (v\u00ed d\u1ee5: PZT &#8211; ch\u00ec zirconat titanat),  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 m\u1ed9t \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00ean v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, n\u00f3 s\u1ebd thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc. Ng\u01b0\u1ee3c l\u1ea1i, khi v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n b\u1ecb n\u00e9n ho\u1eb7c gi\u00e3n n\u1edf, n\u00f3 s\u1ebd t\u1ea1o ra m\u1ed9t \u0111i\u1ec7n \u00e1p.<\/p>\n<h3>C\u1ea5u t\u1ea1o c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m<\/h3>\n<p>M\u1ed9t b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m \u0111i\u1ec3n h\u00ecnh bao g\u1ed3m m\u1ed9t s\u1ed1 th\u00e0nh ph\u1ea7n ch\u00ednh:<\/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 th\u1eadp t\u00edn hi\u1ec7u \u0111i\u1ec7n.<\/li>\n<li><strong>V\u1ecf b\u1ea3o v\u1ec7:<\/strong>  V\u1ecf b\u1ea3o v\u1ec7 gi\u00fap b\u1ea3o v\u1ec7 v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n kh\u1ecfi c\u00e1c t\u00e1c \u0111\u1ed9ng b\u00ean ngo\u00e0i v\u00e0 c\u0169ng gi\u00fap t\u1eadp trung s\u00f3ng si\u00eau \u00e2m.<\/li>\n<li><strong>D\u00e2y d\u1eabn:<\/strong> D\u00e2y d\u1eabn k\u1ebft n\u1ed1i \u0111i\u1ec7n c\u1ef1c v\u1edbi m\u1ea1ch \u0111i\u1ec7n b\u00ean ngo\u00e0i.<\/li>\n<li><strong>L\u1edbp kh\u1edbp n\u1ed1i:<\/strong> L\u1edbp kh\u1edbp n\u1ed1i gi\u00fap truy\u1ec1n s\u00f3ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3 t\u1eeb b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u0111\u1ebfn m\u00f4i tr\u01b0\u1eddng c\u1ea7n kh\u1ea3o s\u00e1t.<\/li>\n<\/ul>\n<h3>Qu\u00e1 tr\u00ecnh ph\u00e1t s\u00f3ng si\u00eau \u00e2m<\/h3>\n<p>Khi m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00ean \u0111i\u1ec7n c\u1ef1c c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i, v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n s\u1ebd dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u1ee9ng. S\u1ef1 dao \u0111\u1ed9ng n\u00e0y t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m lan truy\u1ec1n v\u00e0o m\u00f4i tr\u01b0\u1eddng xung quanh. T\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng si\u00eau \u00e2m \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi t\u1ea7n s\u1ed1 c\u1ee7a \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng.<\/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 m\u1ed9t v\u1eadt th\u1ec3 quay tr\u1edf l\u1ea1i b\u1ed9 chuy\u1ec3n \u0111\u1ed5i, n\u00f3 s\u1ebd l\u00e0m v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n b\u1ecb n\u00e9n v\u00e0 gi\u00e3n n\u1edf. S\u1ef1 bi\u1ebfn d\u1ea1ng n\u00e0y t\u1ea1o ra m\u1ed9t \u0111i\u1ec7n \u00e1p tr\u00ean \u0111i\u1ec7n c\u1ef1c, t\u00edn hi\u1ec7u n\u00e0y sau \u0111\u00f3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch, h\u00ecnh d\u1ea1ng v\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh kh\u00e1c c\u1ee7a v\u1eadt th\u1ec3.<\/p>\n<h3>C\u00e1c lo\u1ea1i b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m<\/h3>\n<p>C\u00f3 nhi\u1ec1u lo\u1ea1i b\u1ed9 chuy\u1ec3n \u0111\u1ed5i 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<\/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 th\u1ea5p<\/td>\n<td>&lt; 1 MHz<\/td>\n<td>L\u00e0m s\u1ea1ch si\u00eau \u00e2m, h\u00e0n si\u00eau \u00e2m<\/td>\n<\/tr>\n<tr>\n<td>T\u1ea7n s\u1ed1 cao<\/td>\n<td>1-10 MHz<\/td>\n<td>Ki\u1ec3m tra v\u1eadt li\u1ec7u, h\u00ecnh \u1ea3nh y t\u1ebf<\/td>\n<\/tr>\n<tr>\n<td>T\u1ea7n s\u1ed1 r\u1ea5t cao<\/td>\n<td>&gt; 10 MHz<\/td>\n<td>H\u00ecnh \u1ea3nh y t\u1ebf \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao, k\u00ednh hi\u1ec3n vi \u00e2m thanh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>T\u1ea7m quan tr\u1ecdng c\u1ee7a vi\u1ec7c l\u1ef1a ch\u1ecdn b\u1ed9 chuy\u1ec3n \u0111\u1ed5i<\/h3>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3. C\u00e1c y\u1ebfu t\u1ed1 c\u1ea7n xem x\u00e9t bao g\u1ed3m t\u1ea7n s\u1ed1, b\u0103ng th\u00f4ng, c\u00f4ng su\u1ea5t v\u00e0 k\u00edch th\u01b0\u1edbc. V\u00ed d\u1ee5, trong y t\u1ebf, b\u1ed9 chuy\u1ec3n \u0111\u1ed5i t\u1ea7n s\u1ed1 cao \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o h\u00ecnh \u1ea3nh c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao, trong khi b\u1ed9 chuy\u1ec3n \u0111\u1ed5i t\u1ea7n s\u1ed1 th\u1ea5p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec1u tr\u1ecb nh\u01b0 v\u1eadt l\u00fd tr\u1ecb li\u1ec7u.  N\u1ebfu c\u1ea7n m\u1ed9t v\u00ed d\u1ee5 c\u1ee5 th\u1ec3 v\u1ec1 \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p, c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c s\u1ea3n ph\u1ea9m c\u1ee7a Beijing Ultrasonic, tuy nhi\u00ean vi\u1ec7c t\u00ecm hi\u1ec3u k\u1ef9 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u1eabn l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh.<\/p>\n<p>T\u00f3m l\u1ea1i, b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb quan tr\u1ecdng v\u1edbi nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n.  S\u1ef1 chuy\u1ec3n \u0111\u1ed5i qua l\u1ea1i gi\u1eefa n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n v\u00e0 n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc cho ph\u00e9p b\u1ed9 chuy\u1ec3n \u0111\u1ed5i  ph\u00e1t v\u00e0 nh\u1eadn s\u00f3ng si\u00eau \u00e2m, m\u1edf ra nhi\u1ec1u \u1ee9ng d\u1ee5ng \u0111a d\u1ea1ng trong cu\u1ed9c s\u1ed1ng. Hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean \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, m\u1ed9t lo\u1ea1i s\u00f3ng \u00e2m thanh c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, \u0111\u00e3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb y t\u1ebf \u0111\u1ebfn c\u00f4ng nghi\u1ec7p. Trung t\u00e2m c\u1ee7a nh\u1eefng \u1ee9ng d\u1ee5ng n\u00e0y ch\u00ednh l\u00e0 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i si\u00eau \u00e2m, m\u1ed9t thi\u1ebft b\u1ecb c\u00f3 kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i<\/p>\n","protected":false},"author":1,"featured_media":19422,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-51028","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\/51028","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=51028"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/51028\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/19422"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=51028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=51028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=51028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}