{"id":45060,"date":"2023-04-22T03:05:08","date_gmt":"2023-04-22T08:05:08","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-create-ultrasonic-sound\/"},"modified":"2025-01-21T07:15:26","modified_gmt":"2025-01-21T12:15:26","slug":"how-to-create-ultrasonic-sound","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-create-ultrasonic-sound\/","title":{"rendered":"T\u1ea1o \u00c2m Thanh Si\u00eau \u00c2m: Ph\u01b0\u01a1ng Ph\u00e1p & \u1ee8ng D\u1ee5ng"},"content":{"rendered":"

\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 (tr\u00ean 20kHz), c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong khoa h\u1ecdc, y t\u1ebf v\u00e0 c\u00f4ng nghi\u1ec7p. Vi\u1ec7c t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p \u0111\u1eb7c bi\u1ec7t v\u00e0 s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 nguy\u00ean l\u00fd v\u1eadt l\u00fd \u0111\u1eb1ng sau n\u00f3. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd tr\u00ecnh b\u00e0y chi ti\u1ebft v\u1ec1 c\u00e1ch t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh n\u00e0y.<\/p>\n

Nguy\u00ean l\u00fd t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m<\/h3>\n

\u00c2m thanh si\u00eau \u00e2m \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng c\u00e1ch khai th\u00e1c hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n ho\u1eb7c hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o. Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n l\u00e0 kh\u1ea3 n\u0103ng c\u1ee7a m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u (nh\u01b0 th\u1ea1ch anh, g\u1ed1m \u00e1p \u0111i\u1ec7n) t\u1ea1o ra \u0111i\u1ec7n \u00e1p khi ch\u1ecbu \u00e1p l\u1ef1c c\u01a1 h\u1ecdc v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, bi\u1ebfn \u0111\u1ed5i \u0111i\u1ec7n \u00e1p th\u00e0nh dao \u0111\u1ed9ng c\u01a1 h\u1ecdc. Hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u1ef1, nh\u01b0ng s\u1eed d\u1ee5ng t\u1eeb tr\u01b0\u1eddng thay v\u00ec \u0111i\u1ec7n tr\u01b0\u1eddng \u0111\u1ec3 t\u1ea1o ra dao \u0111\u1ed9ng.<\/p>\n

S\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n<\/h3>\n

B\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n l\u00e0 thi\u1ebft b\u1ecb ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u1ec3 t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m. M\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, l\u00e0m cho n\u00f3 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 (tr\u00ean 20kHz), \u00e2m thanh si\u00eau \u00e2m \u0111\u01b0\u1ee3c t\u1ea1o ra.<\/p>\n

S\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o<\/h3>\n

M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u t\u1eeb gi\u1ea3o c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m. B\u1eb1ng c\u00e1ch \u0111\u1eb7t v\u1eadt li\u1ec7u n\u00e0y trong m\u1ed9t t\u1eeb tr\u01b0\u1eddng xoay chi\u1ec1u, n\u00f3 s\u1ebd dao \u0111\u1ed9ng v\u00e0 t\u1ea1o ra \u00e2m thanh. Tuy nhi\u00ean, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n so v\u1edbi s\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n.<\/p>\n

C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea7n s\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 si\u00eau \u00e2m<\/h3>\n

T\u1ea7n s\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a \u00e2m thanh si\u00eau \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m:<\/p>\n\n\n\n\n\n\n\n\n
Y\u1ebfu t\u1ed1<\/th>\n\u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea7n s\u1ed1<\/th>\n\u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn c\u01b0\u1eddng \u0111\u1ed9<\/th>\n<\/tr>\n<\/thead>\n
T\u1ea7n s\u1ed1 \u0111i\u1ec7n \u00e1p\/t\u1eeb tr\u01b0\u1eddng<\/td>\nTr\u1ef1c ti\u1ebfp<\/td>\nKh\u00f4ng tr\u1ef1c ti\u1ebfp<\/td>\n<\/tr>\n
\u0110\u1eb7c t\u00ednh v\u1eadt li\u1ec7u (\u00e1p \u0111i\u1ec7n\/t\u1eeb gi\u1ea3o)<\/td>\nTr\u1ef1c ti\u1ebfp<\/td>\nTr\u1ef1c ti\u1ebfp<\/td>\n<\/tr>\n
H\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc b\u1ed9 chuy\u1ec3n \u0111\u1ed5i<\/td>\nTr\u1ef1c ti\u1ebfp<\/td>\nTr\u1ef1c ti\u1ebfp<\/td>\n<\/tr>\n
Bi\u00ean \u0111\u1ed9 \u0111i\u1ec7n \u00e1p\/t\u1eeb tr\u01b0\u1eddng<\/td>\nKh\u00f4ng tr\u1ef1c ti\u1ebfp<\/td>\nTr\u1ef1c ti\u1ebfp<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Thi\u1ebft k\u1ebf v\u00e0 ch\u1ebf t\u1ea1o b\u1ed9 t\u1ea1o si\u00eau \u00e2m<\/h3>\n

Vi\u1ec7c thi\u1ebft k\u1ebf v\u00e0 ch\u1ebf t\u1ea1o b\u1ed9 t\u1ea1o si\u00eau \u00e2m c\u1ea7n ph\u1ea3i t\u00ednh to\u00e1n ch\u00ednh x\u00e1c c\u00e1c th\u00f4ng s\u1ed1 \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ea7n s\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 mong mu\u1ed1n. V\u00ed d\u1ee5, n\u1ebfu c\u1ea7n m\u1ed9t t\u1ea7n s\u1ed1 si\u00eau \u00e2m c\u1ee5 th\u1ec3 cho \u1ee9ng d\u1ee5ng l\u00e0m s\u1ea1ch, c\u1ea7n ch\u1ecdn v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n v\u00e0 thi\u1ebft k\u1ebf b\u1ed9 chuy\u1ec3n \u0111\u1ed5i ph\u00f9 h\u1ee3p.<\/p>\n

\u1ee8ng d\u1ee5ng c\u1ee7a \u00e2m thanh si\u00eau \u00e2m<\/h3>\n

\u00c2m thanh si\u00eau \u00e2m c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng \u0111a d\u1ea1ng, t\u1eeb y t\u1ebf (si\u00eau \u00e2m ch\u1ea9n \u0111o\u00e1n, \u0111i\u1ec1u tr\u1ecb ung th\u01b0) \u0111\u1ebfn c\u00f4ng nghi\u1ec7p (l\u00e0m s\u1ea1ch, h\u00e0n, ki\u1ec3m tra kh\u00f4ng ph\u00e1 h\u1ee7y). V\u00ed d\u1ee5, trong l\u0129nh v\u1ef1c y t\u1ebf, vi\u1ec7c s\u1eed d\u1ee5ng si\u00eau \u00e2m cho ph\u00e9p h\u00ecnh dung c\u00e1c c\u01a1 quan b\u00ean trong c\u01a1 th\u1ec3 m\u00e0 kh\u00f4ng c\u1ea7n ph\u1eabu thu\u1eadt.<\/p>\n

T\u00f3m l\u1ea1i, vi\u1ec7c t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m d\u1ef1a tr\u00ean c\u00e1c nguy\u00ean l\u00fd v\u1eadt l\u00fd nh\u01b0 hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n v\u00e0 hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o. Hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea7n s\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 si\u00eau \u00e2m l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 thi\u1ebft k\u1ebf v\u00e0 \u1ee9ng d\u1ee5ng c\u00f4ng ngh\u1ec7 n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00f4ng ngh\u1ec7 si\u00eau \u00e2m \u0111ang m\u1edf ra nhi\u1ec1u ti\u1ec1m n\u0103ng trong nhi\u1ec1u l\u0129nh v\u1ef1c, h\u1ee9a h\u1eb9n nh\u1eefng \u0111\u1ed9t ph\u00e1 m\u1edbi trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"

\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 (tr\u00ean 20kHz), c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong khoa h\u1ecdc, y t\u1ebf v\u00e0 c\u00f4ng nghi\u1ec7p. Vi\u1ec7c t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p \u0111\u1eb7c bi\u1ec7t v\u00e0 s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 nguy\u00ean l\u00fd v\u1eadt l\u00fd \u0111\u1eb1ng sau<\/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-45060","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\/45060","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=45060"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/45060\/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=45060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=45060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=45060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}