{"id":49572,"date":"2023-04-21T22:07:04","date_gmt":"2023-04-22T03:07:04","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-detect-ultrasonic-waves\/"},"modified":"2025-01-21T07:15:35","modified_gmt":"2025-01-21T12:15:35","slug":"how-to-detect-ultrasonic-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-detect-ultrasonic-waves\/","title":{"rendered":"Ph\u00e1t Hi\u1ec7n S\u00f3ng Si\u00eau \u00c2m: Ph\u01b0\u01a1ng Ph\u00e1p & K\u1ef9 Thu\u1eadt"},"content":{"rendered":"

Si\u00eau \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng khoa h\u1ecdc v\u00e0 c\u00f4ng nghi\u1ec7p. Vi\u1ec7c ph\u00e1t hi\u1ec7n v\u00e0 \u0111o l\u01b0\u1eddng s\u00f3ng si\u00eau \u00e2m l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng n\u00e0y. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd tr\u00ecnh b\u00e0y chi ti\u1ebft v\u1ec1 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u00f3ng si\u00eau \u00e2m.<\/p>\n

S\u1eed d\u1ee5ng microphone si\u00eau \u00e2m<\/h3>\n

Microphone si\u00eau \u00e2m \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 thu nh\u1eadn t\u1ea7n s\u1ed1 cao c\u1ee7a s\u00f3ng si\u00eau \u00e2m. Ch\u00fang ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd \u00e1p \u0111i\u1ec7n, bi\u1ebfn \u0111\u1ed5i \u00e1p su\u1ea5t \u00e2m thanh th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n. \u0110\u1ed9 nh\u1ea1y v\u00e0 d\u1ea3i t\u1ea7n s\u1ed1 c\u1ee7a microphone l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng c\u1ea7n xem x\u00e9t khi l\u1ef1a ch\u1ecdn.<\/p>\n

S\u1eed d\u1ee5ng c\u1ea3m bi\u1ebfn \u00e1p \u0111i\u1ec7n<\/h3>\n

T\u01b0\u01a1ng t\u1ef1 nh\u01b0 microphone si\u00eau \u00e2m, c\u1ea3m bi\u1ebfn \u00e1p \u0111i\u1ec7n c\u0169ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n. Tuy nhi\u00ean, c\u1ea3m bi\u1ebfn \u00e1p \u0111i\u1ec7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111o c\u1ea3 \u00e1p su\u1ea5t v\u00e0 gia t\u1ed1c c\u1ee7a s\u00f3ng si\u00eau \u00e2m, cung c\u1ea5p th\u00f4ng tin chi ti\u1ebft h\u01a1n v\u1ec1 \u0111\u1eb7c t\u00ednh c\u1ee7a s\u00f3ng.<\/p>\n

Ph\u00e1t hi\u1ec7n s\u00f3ng si\u00eau \u00e2m b\u1eb1ng hi\u1ec7u \u1ee9ng quang h\u1ecdc<\/h3>\n

M\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p quang h\u1ecdc c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u00f3ng si\u00eau \u00e2m. V\u00ed d\u1ee5, ph\u01b0\u01a1ng ph\u00e1p Schlieren d\u1ef1a tr\u00ean s\u1ef1 thay \u0111\u1ed5i chi\u1ebft su\u1ea5t c\u1ee7a m\u00f4i tr\u01b0\u1eddng do s\u00f3ng si\u00eau \u00e2m g\u00e2y ra, cho ph\u00e9p h\u00ecnh dung s\u00f3ng si\u00eau \u00e2m.<\/p>\n

Thi\u1ebft b\u1ecb ph\u00e2n t\u00edch t\u00edn hi\u1ec7u<\/h3>\n

Sau khi thu nh\u1eadn t\u00edn hi\u1ec7u si\u00eau \u00e2m b\u1eb1ng microphone ho\u1eb7c c\u1ea3m bi\u1ebfn, t\u00edn hi\u1ec7u \u0111i\u1ec7n c\u1ea7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd v\u00e0 ph\u00e2n t\u00edch. C\u00e1c thi\u1ebft b\u1ecb ph\u00e2n t\u00edch t\u00edn hi\u1ec7u, nh\u01b0 m\u00e1y hi\u1ec7n s\u00f3ng v\u00e0 m\u00e1y ph\u00e2n t\u00edch ph\u1ed5, cho ph\u00e9p hi\u1ec3n th\u1ecb v\u00e0 \u0111o l\u01b0\u1eddng c\u00e1c th\u00f4ng s\u1ed1 c\u1ee7a s\u00f3ng si\u00eau \u00e2m, bao g\u1ed3m t\u1ea7n s\u1ed1, bi\u00ean \u0111\u1ed9 v\u00e0 pha.<\/p>\n

So s\u00e1nh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ph\u00e1t hi\u1ec7n s\u00f3ng 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
Microphone si\u00eau \u00e2m<\/td>\nGi\u00e1 th\u00e0nh h\u1ee3p l\u00fd, d\u1ec5 s\u1eed d\u1ee5ng<\/td>\n\u0110\u1ed9 nh\u1ea1y c\u00f3 th\u1ec3 b\u1ecb h\u1ea1n ch\u1ebf<\/td>\nKi\u1ec3m tra kh\u00f4ng ph\u00e1 h\u1ee7y, \u0111o kho\u1ea3ng c\u00e1ch<\/td>\n<\/tr>\n
C\u1ea3m bi\u1ebfn \u00e1p \u0111i\u1ec7n<\/td>\n\u0110\u1ed9 ch\u00ednh x\u00e1c cao, \u0111o \u0111\u01b0\u1ee3c nhi\u1ec1u th\u00f4ng s\u1ed1<\/td>\nC\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec5u \u0111i\u1ec7n<\/td>\nY t\u1ebf, \u0111o l\u01b0\u1eddng c\u00f4ng nghi\u1ec7p<\/td>\n<\/tr>\n
Ph\u01b0\u01a1ng ph\u00e1p quang h\u1ecdc<\/td>\nH\u00ecnh dung tr\u1ef1c quan s\u00f3ng si\u00eau \u00e2m<\/td>\nThi\u1ebft l\u1eadp ph\u1ee9c t\u1ea1p, chi ph\u00ed cao<\/td>\nNghi\u00ean c\u1ee9u khoa h\u1ecdc<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

L\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ph\u00f9 h\u1ee3p<\/h3>\n

Vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ph\u00e1t hi\u1ec7n s\u00f3ng si\u00eau \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 v\u00e0 y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c, chi ph\u00ed v\u00e0 \u0111\u1ed9 ph\u1ee9c t\u1ea1p. V\u00ed d\u1ee5, n\u1ebfu c\u1ea7n \u0111o kho\u1ea3ng c\u00e1ch trong kh\u00f4ng kh\u00ed, microphone si\u00eau \u00e2m c\u00f3 th\u1ec3 l\u00e0 l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng y t\u1ebf \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c cao, c\u1ea3m bi\u1ebfn \u00e1p \u0111i\u1ec7n l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1t h\u01a1n.<\/p>\n

T\u00f3m l\u1ea1i, vi\u1ec7c ph\u00e1t hi\u1ec7n s\u00f3ng si\u00eau \u00e2m c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n th\u00f4ng qua nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nhau, m\u1ed7i ph\u01b0\u01a1ng ph\u00e1p c\u00f3 \u01b0u \u0111i\u1ec3m v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m ri\u00eang. Hi\u1ec3u r\u00f5 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a t\u1eebng ph\u01b0\u01a1ng ph\u00e1p v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 s\u1ebd gi\u00fap l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ph\u00f9 h\u1ee3p nh\u1ea5t \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u qu\u1ea3 t\u1ed1i \u01b0u.<\/p>\n","protected":false},"excerpt":{"rendered":"

Si\u00eau \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng khoa h\u1ecdc v\u00e0 c\u00f4ng nghi\u1ec7p. Vi\u1ec7c ph\u00e1t hi\u1ec7n v\u00e0 \u0111o l\u01b0\u1eddng s\u00f3ng si\u00eau \u00e2m l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng n\u00e0y. B\u00e0i vi\u1ebft n\u00e0y<\/p>\n","protected":false},"author":1,"featured_media":26472,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-49572","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\/49572","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=49572"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/49572\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26472"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=49572"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=49572"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=49572"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}