{"id":44612,"date":"2023-04-25T14:37:27","date_gmt":"2023-04-25T19:37:27","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/what-is-the-frequency-range-of-ultrasonic-waves\/"},"modified":"2025-01-21T07:29:26","modified_gmt":"2025-01-21T12:29:26","slug":"what-is-the-frequency-range-of-ultrasonic-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/what-is-the-frequency-range-of-ultrasonic-waves\/","title":{"rendered":"T\u00ecm Hi\u1ec3u V\u1ec1 D\u1ea3i T\u1ea7n S\u1ed1 C\u1ee7a S\u00f3ng Si\u00eau \u00c2m"},"content":{"rendered":"<p>S\u00f3ng si\u00eau \u00e2m, m\u1ed9t d\u1ea1ng s\u00f3ng \u00e2m thanh n\u1eb1m ngo\u00e0i ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, \u0111\u00e3 v\u00e0 \u0111ang \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u l\u0129nh v\u1ef1c t\u1eeb y t\u1ebf, c\u00f4ng nghi\u1ec7p \u0111\u1ebfn nghi\u00ean c\u1ee9u khoa h\u1ecdc.  M\u1ed9t \u0111\u1eb7c \u0111i\u1ec3m quan tr\u1ecdng \u0111\u1ec3 ph\u00e2n bi\u1ec7t v\u00e0 \u1ee9ng d\u1ee5ng s\u00f3ng si\u00eau \u00e2m ch\u00ednh l\u00e0 t\u1ea7n s\u1ed1 c\u1ee7a ch\u00fang. V\u1eady t\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng si\u00eau \u00e2m n\u1eb1m trong kho\u1ea3ng n\u00e0o?<\/p>\n<h3>T\u1ea7n s\u1ed1 v\u00e0 S\u00f3ng \u00c2m<\/h3>\n<p>\u00c2m thanh \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi s\u1ef1 rung \u0111\u1ed9ng v\u00e0 lan truy\u1ec1n d\u01b0\u1edbi d\u1ea1ng s\u00f3ng. T\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng \u00e2m, \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng Hertz (Hz), th\u1ec3 hi\u1ec7n s\u1ed1 l\u01b0\u1ee3ng dao \u0111\u1ed9ng m\u00e0 s\u00f3ng th\u1ef1c hi\u1ec7n trong m\u1ed9t gi\u00e2y. Tai ng\u01b0\u1eddi b\u00ecnh th\u01b0\u1eddng c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c \u00e2m thanh trong kho\u1ea3ng t\u1ea7n s\u1ed1 t\u1eeb 20 Hz \u0111\u1ebfn 20.000 Hz.<\/p>\n<h3>Kho\u1ea3ng T\u1ea7n S\u1ed1 c\u1ee7a S\u00f3ng Si\u00eau \u00c2m<\/h3>\n<p>S\u00f3ng si\u00eau \u00e2m \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 s\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, t\u1ee9c l\u00e0 tr\u00ean 20.000 Hz (20 kHz).  Kh\u00f4ng c\u00f3 gi\u1edbi h\u1ea1n tr\u00ean c\u1ed1 \u0111\u1ecbnh cho t\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng si\u00eau \u00e2m.  Tuy nhi\u00ean, trong th\u1ef1c t\u1ebf, c\u00e1c \u1ee9ng d\u1ee5ng th\u01b0\u1eddng s\u1eed d\u1ee5ng s\u00f3ng si\u00eau \u00e2m trong kho\u1ea3ng t\u1eeb 20 kHz \u0111\u1ebfn v\u00e0i MHz, th\u1eadm ch\u00ed l\u00ean \u0111\u1ebfn h\u00e0ng GHz trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p nghi\u00ean c\u1ee9u \u0111\u1eb7c bi\u1ec7t.<\/p>\n<h3>Ph\u00e2n lo\u1ea1i S\u00f3ng Si\u00eau \u00c2m theo T\u1ea7n S\u1ed1<\/h3>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Kho\u1ea3ng T\u1ea7n S\u1ed1<\/th>\n<th>\u1ee8ng D\u1ee5ng Ti\u00eau Bi\u1ec3u<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>20 kHz &#8211; 100 kHz<\/td>\n<td>V\u1ec7 sinh c\u00f4ng nghi\u1ec7p, ki\u1ec3m tra v\u1eadt li\u1ec7u, \u0111u\u1ed5i c\u00f4n tr\u00f9ng<\/td>\n<\/tr>\n<tr>\n<td>100 kHz &#8211; 1 MHz<\/td>\n<td>H\u00ecnh \u1ea3nh y t\u1ebf, \u0111i\u1ec1u tr\u1ecb y t\u1ebf, \u0111o kho\u1ea3ng c\u00e1ch<\/td>\n<\/tr>\n<tr>\n<td>1 MHz &#8211; 10 MHz<\/td>\n<td>Ki\u1ec3m tra vi c\u1ea5u tr\u00fac v\u1eadt li\u1ec7u, vi ph\u1eabu thu\u1eadt<\/td>\n<\/tr>\n<tr>\n<td>Tr\u00ean 10 MHz<\/td>\n<td>Nghi\u00ean c\u1ee9u khoa h\u1ecdc, ph\u00e2n t\u00edch v\u1eadt li\u1ec7u \u1edf c\u1ea5p \u0111\u1ed9 nano<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Y\u1ebfu t\u1ed1 \u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn L\u1ef1a Ch\u1ecdn T\u1ea7n S\u1ed1<\/h3>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn t\u1ea7n s\u1ed1 s\u00f3ng si\u00eau \u00e2m ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3. T\u1ea7n s\u1ed1 cao h\u01a1n cho \u0111\u1ed9 ph\u00e2n gi\u1ea3i h\u00ecnh \u1ea3nh t\u1ed1t h\u01a1n nh\u01b0ng l\u1ea1i b\u1ecb h\u1ea5p th\u1ee5 nhanh h\u01a1n trong m\u00f4i tr\u01b0\u1eddng, do \u0111\u00f3 ch\u1ec9 ph\u00f9 h\u1ee3p cho vi\u1ec7c ki\u1ec3m tra c\u00e1c v\u1eadt li\u1ec7u m\u1ecfng ho\u1eb7c n\u1eb1m g\u1ea7n b\u1ec1 m\u1eb7t.  Ng\u01b0\u1ee3c l\u1ea1i, t\u1ea7n s\u1ed1 th\u1ea5p h\u01a1n cho kh\u1ea3 n\u0103ng xuy\u00ean s\u00e2u t\u1ed1t h\u01a1n, th\u00edch h\u1ee3p cho vi\u1ec7c ki\u1ec3m tra c\u00e1c v\u1eadt li\u1ec7u d\u00e0y ho\u1eb7c n\u1eb1m s\u00e2u b\u00ean trong.<\/p>\n<h3>M\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 \u1ee9ng d\u1ee5ng s\u00f3ng si\u00eau \u00e2m v\u1edbi t\u1ea7n s\u1ed1 kh\u00e1c nhau<\/h3>\n<p>S\u00f3ng si\u00eau \u00e2m \u1edf t\u1ea7n s\u1ed1 40 kHz th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb v\u1ec7 sinh c\u00f4ng nghi\u1ec7p.  Trong y t\u1ebf, s\u00f3ng si\u00eau \u00e2m \u1edf t\u1ea7n s\u1ed1 v\u00e0i MHz \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o h\u00ecnh \u1ea3nh thai nhi ho\u1eb7c ki\u1ec3m tra c\u00e1c c\u01a1 quan n\u1ed9i t\u1ea1ng.  M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng \u0111\u1eb7c bi\u1ec7t, v\u00ed d\u1ee5 nh\u01b0 k\u00ednh hi\u1ec3n vi \u00e2m thanh, c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u00f3ng si\u00eau \u00e2m v\u1edbi t\u1ea7n s\u1ed1 l\u00ean \u0111\u1ebfn GHz.<\/p>\n<p>T\u00f3m l\u1ea1i, s\u00f3ng si\u00eau \u00e2m bao g\u1ed3m m\u1ed9t d\u1ea3i t\u1ea7n s\u1ed1 r\u1ed9ng l\u1edbn, b\u1eaft \u0111\u1ea7u t\u1eeb tr\u00ean 20 kHz v\u00e0 m\u1edf r\u1ed9ng \u0111\u1ebfn h\u00e0ng GHz.  Vi\u1ec7c hi\u1ec3u r\u00f5 v\u1ec1 kho\u1ea3ng t\u1ea7n s\u1ed1 n\u00e0y v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa t\u1ea7n s\u1ed1 v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 khai th\u00e1c t\u1ed1i \u0111a ti\u1ec1m n\u0103ng c\u1ee7a c\u00f4ng ngh\u1ec7 s\u00f3ng si\u00eau \u00e2m.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u00f3ng si\u00eau \u00e2m, m\u1ed9t d\u1ea1ng s\u00f3ng \u00e2m thanh n\u1eb1m ngo\u00e0i ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, \u0111\u00e3 v\u00e0 \u0111ang \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u l\u0129nh v\u1ef1c t\u1eeb y t\u1ebf, c\u00f4ng nghi\u1ec7p \u0111\u1ebfn nghi\u00ean c\u1ee9u khoa h\u1ecdc. M\u1ed9t \u0111\u1eb7c \u0111i\u1ec3m quan tr\u1ecdng \u0111\u1ec3 ph\u00e2n bi\u1ec7t v\u00e0 \u1ee9ng d\u1ee5ng s\u00f3ng si\u00eau \u00e2m ch\u00ednh l\u00e0 t\u1ea7n s\u1ed1<\/p>\n","protected":false},"author":1,"featured_media":26461,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-44612","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\/44612","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=44612"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/44612\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26461"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=44612"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=44612"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=44612"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}