{"id":47348,"date":"2023-04-22T00:25:25","date_gmt":"2023-04-22T05:25:25","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-produce-ultrasonic-sound\/"},"modified":"2025-01-21T07:21:07","modified_gmt":"2025-01-21T12:21:07","slug":"how-to-produce-ultrasonic-sound","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-produce-ultrasonic-sound\/","title":{"rendered":"K\u1ef9 thu\u1eadt t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m hi\u1ec7u qu\u1ea3"},"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 \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 \u00e2m thanh si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi nh\u1eefng k\u1ef9 thu\u1eadt v\u00e0 thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng, v\u00e0 b\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn \u0111\u1ec3 t\u1ea1o ra lo\u1ea1i \u00e2m thanh \u0111\u1eb7c bi\u1ec7t n\u00e0y.<\/p>\n

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

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 \u00e2m thanh si\u00eau \u00e2m. M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u nh\u01b0 th\u1ea1ch anh, g\u1ed1m \u00e1p \u0111i\u1ec7n (v\u00ed d\u1ee5: PZT) 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 \u00e1p 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. B\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1 \u0111i\u1ec7n \u00e1p, ta c\u00f3 th\u1ec3 t\u1ea1o ra dao \u0111\u1ed9ng c\u01a1 h\u1ecdc \u1edf t\u1ea7n s\u1ed1 si\u00eau \u00e2m.<\/p>\n

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

Hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o, t\u01b0\u01a1ng t\u1ef1 nh\u01b0 hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n, c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m. V\u1eadt li\u1ec7u t\u1eeb gi\u1ea3o thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc khi \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean. Khi \u0111\u1eb7t v\u1eadt li\u1ec7u t\u1eeb gi\u1ea3o trong m\u1ed9t cu\u1ed9n d\u00e2y v\u00e0 cho d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u ch\u1ea1y qua, t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean s\u1ebd khi\u1ebfn v\u1eadt li\u1ec7u dao \u0111\u1ed9ng, t\u1ea1o ra \u00e2m thanh. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi c\u00f4ng su\u1ea5t cao.<\/p>\n

S\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng \u0111i\u1ec7n gi\u1ea3o<\/h3>\n

Hi\u1ec7u \u1ee9ng \u0111i\u1ec7n gi\u1ea3o \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n so v\u1edbi hai ph\u01b0\u01a1ng ph\u00e1p tr\u00ean, nh\u01b0ng c\u0169ng c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m. Trong hi\u1ec7u \u1ee9ng \u0111i\u1ec7n gi\u1ea3o, k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt li\u1ec7u thay \u0111\u1ed5i khi \u0111\u1eb7t trong \u0111i\u1ec7n tr\u01b0\u1eddng bi\u1ebfn thi\u00ean. T\u01b0\u01a1ng t\u1ef1 nh\u01b0 hi\u1ec7u \u1ee9ng t\u1eeb gi\u1ea3o, b\u1eb1ng c\u00e1ch \u0111\u1eb7t v\u1eadt li\u1ec7u \u0111i\u1ec7n gi\u1ea3o trong m\u1ed9t \u0111i\u1ec7n tr\u01b0\u1eddng xoay chi\u1ec1u, ta c\u00f3 th\u1ec3 t\u1ea1o ra dao \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 si\u00eau \u00e2m.<\/p>\n

So s\u00e1nh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o \u00e2m thanh si\u00eau \u00e2m<\/h3>\n\n\n\n\n\n\n\n
Ph\u01b0\u01a1ng ph\u00e1p<\/th>\n\u01afu \u0111i\u1ec3m<\/th>\nNh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n\u1ee8ng d\u1ee5ng<\/th>\n<\/tr>\n<\/thead>\n
\u00c1p \u0111i\u1ec7n<\/td>\nHi\u1ec7u su\u1ea5t cao, k\u00edch th\u01b0\u1edbc nh\u1ecf g\u1ecdn, d\u1ec5 \u0111i\u1ec1u khi\u1ec3n<\/td>\n\u0110\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc h\u1ea1n ch\u1ebf \u1edf t\u1ea7n s\u1ed1 cao<\/td>\nC\u1ea3m bi\u1ebfn, thi\u1ebft b\u1ecb y t\u1ebf, v\u1ec7 sinh c\u00f4ng nghi\u1ec7p<\/td>\n<\/tr>\n
T\u1eeb gi\u1ea3o<\/td>\nC\u00f4ng su\u1ea5t cao, \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc t\u1ed1t<\/td>\nK\u00edch th\u01b0\u1edbc l\u1edbn, kh\u00f3 \u0111i\u1ec1u khi\u1ec3n t\u1ea7n s\u1ed1 ch\u00ednh x\u00e1c<\/td>\nL\u00e0m s\u1ea1ch si\u00eau \u00e2m c\u00f4ng su\u1ea5t l\u1edbn, gia c\u00f4ng v\u1eadt li\u1ec7u<\/td>\n<\/tr>\n
\u0110i\u1ec7n gi\u1ea3o<\/td>\n\u0110\u1ed9 nh\u1ea1y cao<\/td>\nHi\u1ec7u su\u1ea5t th\u1ea5p, \u00edt \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf<\/td>\nNghi\u00ean c\u1ee9u khoa h\u1ecdc<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

L\u1ef1a ch\u1ecdn 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 si\u00eau \u00e2m c\u1ea7n \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn c\u1ea9n th\u1eadn t\u00f9y thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3. V\u00ed d\u1ee5, trong y t\u1ebf, t\u1ea7n s\u1ed1 si\u00eau \u00e2m th\u1ea5p (1-3 MHz) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho ch\u1ea9n \u0111o\u00e1n h\u00ecnh \u1ea3nh, trong khi t\u1ea7n s\u1ed1 cao h\u01a1n (3-10 MHz) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho \u0111i\u1ec1u tr\u1ecb. C\u01b0\u1eddng \u0111\u1ed9 si\u00eau \u00e2m c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n c\u1ee7a \u1ee9ng d\u1ee5ng.<\/p>\n

Vi\u1ec7c t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd v\u00e0 k\u1ef9 thu\u1eadt chuy\u00ean m\u00f4n. T\u1eeb vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ph\u00f9 h\u1ee3p, thi\u1ebft k\u1ebf m\u1ea1ch \u0111i\u1ec7n, \u0111\u1ebfn vi\u1ec7c ki\u1ec3m so\u00e1t t\u1ea7n s\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9, m\u1ed7i b\u01b0\u1edbc \u0111\u1ec1u \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c t\u1ea1o ra \u00e2m thanh si\u00eau \u00e2m hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n. S\u1ef1 ph\u00e1t tri\u1ec3n kh\u00f4ng ng\u1eebng c\u1ee7a c\u00f4ng ngh\u1ec7 h\u1ee9a h\u1eb9n s\u1ebd mang \u0111\u1ebfn nh\u1eefng \u1ee9ng d\u1ee5ng m\u1edbi v\u00e0 \u0111\u1ed9t ph\u00e1 h\u01a1n n\u1eefa trong l\u0129nh v\u1ef1c si\u00eau \u00e2m.<\/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 \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 \u00e2m thanh si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi nh\u1eefng k\u1ef9 thu\u1eadt v\u00e0 thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng, v\u00e0 b\u00e0i vi\u1ebft<\/p>\n","protected":false},"author":1,"featured_media":26470,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-47348","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\/47348","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=47348"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/47348\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26470"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=47348"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=47348"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=47348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}