{"id":45364,"date":"2023-04-22T02:57:15","date_gmt":"2023-04-22T07:57:15","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-make-ultrasonic-sound-waves\/"},"modified":"2025-01-21T07:20:35","modified_gmt":"2025-01-21T12:20:35","slug":"how-to-make-ultrasonic-sound-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-make-ultrasonic-sound-waves\/","title":{"rendered":"T\u1ea1o s\u00f3ng si\u00eau \u00e2m: H\u01b0\u1edbng d\u1eabn chi ti\u1ebft t\u1eeb A \u0111\u1ebfn Z"},"content":{"rendered":"<p>\u00c2m thanh si\u00eau \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, c\u00f3 \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c t\u1eeb y t\u1ebf, c\u00f4ng nghi\u1ec7p cho \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 v\u00e0 thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o chi ti\u1ebft c\u00e1ch t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m, t\u1eeb nguy\u00ean l\u00fd c\u01a1 b\u1ea3n \u0111\u1ebfn c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn.<\/p>\n<h3>Nguy\u00ean l\u00fd t\u1ea1o s\u00f3ng si\u00eau \u00e2m<\/h3>\n<p>S\u00f3ng si\u00eau \u00e2m, gi\u1ed1ng nh\u01b0 m\u1ecdi s\u00f3ng \u00e2m thanh kh\u00e1c, \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi s\u1ef1 dao \u0111\u1ed9ng. Tuy nhi\u00ean, t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng n\u00e0y ph\u1ea3i \u0111\u1ee7 cao, v\u01b0\u1ee3t qu\u00e1 20kHz, \u0111\u1ec3 \u0111\u01b0\u1ee3c coi l\u00e0 si\u00eau \u00e2m.  S\u1ef1 dao \u0111\u1ed9ng n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng nhi\u1ec1u c\u00e1ch kh\u00e1c nhau, t\u1eeb hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n \u0111\u1ebfn hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o.<\/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.  M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 th\u1ea1ch anh, g\u1ed1m \u00e1p \u0111i\u1ec7n, c\u00f3 kh\u1ea3 n\u0103ng bi\u1ebfn \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n th\u00e0nh n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Khi m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng 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. N\u1ebfu t\u1ea7n s\u1ed1 n\u00e0y \u0111\u1ee7 cao, v\u1eadt li\u1ec7u s\u1ebd t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>V\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n<\/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>Th\u1ea1ch anh<\/td>\n<td>\u0110\u1ed9 \u1ed5n \u0111\u1ecbnh cao<\/td>\n<td>Hi\u1ec7u su\u1ea5t th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td>G\u1ed1m \u00e1p \u0111i\u1ec7n (PZT)<\/td>\n<td>Hi\u1ec7u su\u1ea5t cao<\/td>\n<td>\u0110\u1ed9 \u1ed5n \u0111\u1ecbnh k\u00e9m h\u01a1n th\u1ea1ch anh<\/td>\n<\/tr>\n<tr>\n<td>Polyvinylidene fluoride (PVDF)<\/td>\n<td>Linh ho\u1ea1t, d\u1ebbo<\/td>\n<td>Hi\u1ec7u su\u1ea5t th\u1ea5p h\u01a1n PZT<\/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 c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m. Trong ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, m\u1ed9t v\u1eadt li\u1ec7u t\u1eeb gi\u1ea3o \u0111\u01b0\u1ee3c \u0111\u1eb7t trong m\u1ed9t t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean. S\u1ef1 thay \u0111\u1ed5i c\u1ee7a t\u1eeb tr\u01b0\u1eddng s\u1ebd l\u00e0m thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt li\u1ec7u, t\u1ea1o ra dao \u0111\u1ed9ng v\u00e0 t\u1eeb \u0111\u00f3 t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m.  Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng su\u1ea5t cao.<\/p>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u00f3ng si\u00eau \u00e2m<\/h3>\n<p>T\u1ea7n s\u1ed1, bi\u00ean \u0111\u1ed9 v\u00e0 h\u01b0\u1edbng c\u1ee7a s\u00f3ng si\u00eau \u00e2m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i c\u00e1c th\u00f4ng s\u1ed1 c\u1ee7a t\u00edn hi\u1ec7u \u0111i\u1ec7n \u00e1p ho\u1eb7c t\u1eeb tr\u01b0\u1eddng. V\u00ed d\u1ee5, t\u0103ng t\u1ea7n s\u1ed1 c\u1ee7a \u0111i\u1ec7n \u00e1p \u00e1p d\u1ee5ng v\u00e0o v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n s\u1ebd l\u00e0m t\u0103ng t\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng si\u00eau \u00e2m.  Vi\u1ec7c l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u c\u0169ng \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a s\u00f3ng si\u00eau \u00e2m.<\/p>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a s\u00f3ng si\u00eau \u00e2m<\/h3>\n<p>S\u00f3ng si\u00eau \u00e2m c\u00f3 v\u00f4 s\u1ed1 \u1ee9ng d\u1ee5ng trong cu\u1ed9c s\u1ed1ng, t\u1eeb vi\u1ec7c ki\u1ec3m tra khuy\u1ebft t\u1eadt trong v\u1eadt li\u1ec7u,  ch\u1ea9n \u0111o\u00e1n y t\u1ebf nh\u01b0 si\u00eau \u00e2m thai,  \u0111\u1ebfn l\u00e0m s\u1ea1ch \u0111\u1ed3 trang s\u1ee9c.  S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00f4ng ngh\u1ec7 si\u00eau \u00e2m \u0111ang m\u1edf ra nh\u1eefng ti\u1ec1m n\u0103ng m\u1edbi trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau.<\/p>\n<p>T\u00f3m l\u1ea1i, vi\u1ec7c t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m d\u1ef1a tr\u00ean nguy\u00ean l\u00fd dao \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 cao, th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n ho\u1eb7c hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o.  S\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 c\u00e1c nguy\u00ean l\u00fd n\u00e0y v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u00f3ng si\u00eau \u00e2m l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u1ee9ng d\u1ee5ng hi\u1ec7u qu\u1ea3 c\u00f4ng ngh\u1ec7 n\u00e0y trong th\u1ef1c t\u1ebf.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00c2m thanh si\u00eau \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, c\u00f3 \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c t\u1eeb y t\u1ebf, c\u00f4ng nghi\u1ec7p cho \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 v\u00e0 thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i<\/p>\n","protected":false},"author":1,"featured_media":26474,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-45364","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\/45364","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=45364"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/45364\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26474"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=45364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=45364"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=45364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}