{"id":49564,"date":"2023-04-21T22:08:10","date_gmt":"2023-04-22T03:08:10","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-detect-infrasound\/"},"modified":"2025-01-21T07:15:33","modified_gmt":"2025-01-21T12:15:33","slug":"how-to-detect-infrasound","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-detect-infrasound\/","title":{"rendered":"Ph\u00e1t hi\u1ec7n h\u1ea1 \u00e2m: Ph\u01b0\u01a1ng ph\u00e1p v\u00e0 \u1ee9ng d\u1ee5ng"},"content":{"rendered":"

\u00c2m thanh h\u1ea1 \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 n\u1eb1m d\u01b0\u1edbi ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi (th\u01b0\u1eddng d\u01b0\u1edbi 20Hz), tuy v\u00f4 h\u00ecnh nh\u01b0ng l\u1ea1i c\u00f3 th\u1ec3 mang theo th\u00f4ng tin quan tr\u1ecdng v\u1ec1 c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng t\u1ef1 nhi\u00ean v\u00e0 nh\u00e2n t\u1ea1o. Vi\u1ec7c ph\u00e1t hi\u1ec7n v\u00e0 ph\u00e2n t\u00edch h\u1ea1 \u00e2m \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb d\u1ef1 b\u00e1o \u0111\u1ed9ng \u0111\u1ea5t \u0111\u1ebfn gi\u00e1m s\u00e1t ho\u1ea1t \u0111\u1ed9ng n\u00fai l\u1eeda, theo d\u00f5i c\u00e1c v\u1ee5 n\u1ed5 v\u00e0 th\u1eadm ch\u00ed c\u1ea3 trong nghi\u00ean c\u1ee9u h\u00e0nh vi \u0111\u1ed9ng v\u1eadt. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 c\u00f4ng ngh\u1ec7 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n h\u1ea1 \u00e2m.<\/p>\n

Micro h\u1ea1 \u00e2m chuy\u00ean d\u1ee5ng<\/h3>\n

Kh\u00e1c v\u1edbi micro th\u00f4ng th\u01b0\u1eddng, micro h\u1ea1 \u00e2m \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 c\u1ea3m nh\u1eadn \u0111\u01b0\u1ee3c nh\u1eefng bi\u1ebfn \u0111\u1ed5i \u00e1p su\u1ea5t c\u1ef1c nh\u1ecf do s\u00f3ng h\u1ea1 \u00e2m g\u00e2y ra. Ch\u00fang th\u01b0\u1eddng c\u00f3 m\u00e0ng rung l\u1edbn h\u01a1n v\u00e0 \u0111\u1ed9 nh\u1ea1y cao h\u01a1n, cho ph\u00e9p ch\u00fang ghi l\u1ea1i nh\u1eefng t\u00edn hi\u1ec7u h\u1ea1 \u00e2m y\u1ebfu \u1edbt. M\u1ed9t s\u1ed1 micro h\u1ea1 \u00e2m c\u00f2n \u0111\u01b0\u1ee3c trang b\u1ecb b\u1ed9 l\u1ecdc \u0111\u1ec3 lo\u1ea1i b\u1ecf nhi\u1ec5u \u00e2m thanh \u1edf t\u1ea7n s\u1ed1 cao h\u01a1n.<\/p>\n

C\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t vi sai<\/h3>\n

Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y s\u1eed d\u1ee5ng hai c\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t \u0111\u1eb7t c\u00e1ch nhau m\u1ed9t kho\u1ea3ng c\u00e1ch nh\u1ea5t \u0111\u1ecbnh. S\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 \u00e1p su\u1ea5t gi\u1eefa hai c\u1ea3m bi\u1ebfn n\u00e0y, \u0111\u01b0\u1ee3c ghi l\u1ea1i theo th\u1eddi gian, c\u00f3 th\u1ec3 ti\u1ebft l\u1ed9 s\u1ef1 hi\u1ec7n di\u1ec7n c\u1ee7a s\u00f3ng h\u1ea1 \u00e2m. K\u1ef9 thu\u1eadt n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c tr\u1ea1m quan tr\u1eafc h\u1ea1 \u00e2m ngo\u00e0i tr\u1eddi.<\/p>\n

M\u00e1y \u0111o gia t\u1ed1c<\/h3>\n

M\u00e1y \u0111o gia t\u1ed1c, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o \u0111\u1ed9 rung, c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n h\u1ea1 \u00e2m. S\u00f3ng h\u1ea1 \u00e2m, khi t\u00e1c \u0111\u1ed9ng l\u00ean m\u1ed9t v\u1eadt th\u1ec3, s\u1ebd g\u00e2y ra nh\u1eefng dao \u0111\u1ed9ng nh\u1ecf. M\u00e1y \u0111o gia t\u1ed1c c\u00f3 th\u1ec3 ghi l\u1ea1i nh\u1eefng dao \u0111\u1ed9ng n\u00e0y v\u00e0 chuy\u1ec3n \u0111\u1ed5i ch\u00fang th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n \u0111\u1ec3 ph\u00e2n t\u00edch.<\/p>\n

K\u1ef9 thu\u1eadt giao thoa k\u1ebf laser<\/h3>\n

Giao thoa k\u1ebf laser l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 c\u1ef1c k\u1ef3 nh\u1ea1y, c\u00f3 kh\u1ea3 n\u0103ng ph\u00e1t hi\u1ec7n nh\u1eefng thay \u0111\u1ed5i c\u1ef1c nh\u1ecf v\u1ec1 kho\u1ea3ng c\u00e1ch. Trong l\u0129nh v\u1ef1c ph\u00e1t hi\u1ec7n h\u1ea1 \u00e2m, giao thoa k\u1ebf laser \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o s\u1ef1 bi\u1ebfn d\u1ea1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng do s\u00f3ng h\u1ea1 \u00e2m g\u00e2y ra, t\u1eeb \u0111\u00f3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c s\u1ef1 hi\u1ec7n di\u1ec7n v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a s\u00f3ng.<\/p>\n

So s\u00e1nh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ph\u00e1t hi\u1ec7n h\u1ea1 \u00e2m<\/h3>\n\n\n\n\n\n\n\n\n
Ph\u01b0\u01a1ng ph\u00e1p<\/th>\n\u0110\u1ed9 nh\u1ea1y<\/th>\nD\u1ea3i t\u1ea7n s\u1ed1<\/th>\n\u1ee8ng d\u1ee5ng<\/th>\n\u01afu \u0111i\u1ec3m<\/th>\nNh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n
Micro h\u1ea1 \u00e2m<\/td>\nCao<\/td>\nR\u1ed9ng<\/td>\nGi\u00e1m s\u00e1t n\u00fai l\u1eeda, \u0111\u1ed9ng \u0111\u1ea5t, v\u1ee5 n\u1ed5<\/td>\nD\u1ec5 s\u1eed d\u1ee5ng, chi ph\u00ed th\u1ea5p<\/td>\nD\u1ec5 b\u1ecb nhi\u1ec5u \u00e2m thanh<\/td>\n<\/tr>\n
C\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t vi sai<\/td>\nTrung b\u00ecnh<\/td>\nH\u1eb9p<\/td>\nQuan tr\u1eafc h\u1ea1 \u00e2m ngo\u00e0i tr\u1eddi<\/td>\n\u1ed4n \u0111\u1ecbnh<\/td>\nK\u00edch th\u01b0\u1edbc l\u1edbn, kh\u00f3 di chuy\u1ec3n<\/td>\n<\/tr>\n
M\u00e1y \u0111o gia t\u1ed1c<\/td>\nTh\u1ea5p<\/td>\nH\u1eb9p<\/td>\nPh\u00e1t hi\u1ec7n h\u1ea1 \u00e2m g\u1ea7n ngu\u1ed3n<\/td>\nGi\u00e1 th\u00e0nh r\u1ebb<\/td>\n\u0110\u1ed9 nh\u1ea1y k\u00e9m<\/td>\n<\/tr>\n
Giao thoa k\u1ebf laser<\/td>\nC\u1ef1c k\u1ef3 cao<\/td>\nR\u1ed9ng<\/td>\nNghi\u00ean c\u1ee9u khoa h\u1ecdc, \u1ee9ng d\u1ee5ng \u0111\u1eb7c bi\u1ec7t<\/td>\n\u0110\u1ed9 ch\u00ednh x\u00e1c cao<\/td>\nChi ph\u00ed cao, ph\u1ee9c t\u1ea1p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ph\u00e1t hi\u1ec7n h\u1ea1 \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 nh\u1ea1y, d\u1ea3i t\u1ea7n s\u1ed1 c\u1ea7n quan s\u00e1t, \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng v\u00e0 ng\u00e2n s\u00e1ch. S\u1ef1 ph\u00e1t tri\u1ec3n kh\u00f4ng ng\u1eebng c\u1ee7a c\u00f4ng ngh\u1ec7 h\u1ee9a h\u1eb9n s\u1ebd mang l\u1ea1i nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p ph\u00e1t hi\u1ec7n h\u1ea1 \u00e2m hi\u1ec7u qu\u1ea3 v\u00e0 ch\u00ednh x\u00e1c h\u01a1n trong t\u01b0\u01a1ng lai, m\u1edf ra nh\u1eefng \u1ee9ng d\u1ee5ng m\u1edbi trong khoa h\u1ecdc v\u00e0 \u0111\u1eddi s\u1ed1ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c2m thanh h\u1ea1 \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 n\u1eb1m d\u01b0\u1edbi ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi (th\u01b0\u1eddng d\u01b0\u1edbi 20Hz), tuy v\u00f4 h\u00ecnh nh\u01b0ng l\u1ea1i c\u00f3 th\u1ec3 mang theo th\u00f4ng tin quan tr\u1ecdng v\u1ec1 c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng t\u1ef1 nhi\u00ean v\u00e0 nh\u00e2n t\u1ea1o. Vi\u1ec7c ph\u00e1t hi\u1ec7n v\u00e0 ph\u00e2n t\u00edch h\u1ea1 \u00e2m \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong nhi\u1ec1u l\u0129nh<\/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-49564","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\/49564","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=49564"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/49564\/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=49564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=49564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=49564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}