{"id":56045,"date":"2022-04-16T07:50:22","date_gmt":"2022-04-16T12:50:22","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/measuring-distance-with-sound-waves\/"},"modified":"2025-01-21T07:25:31","modified_gmt":"2025-01-21T12:25:31","slug":"measuring-distance-with-sound-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/measuring-distance-with-sound-waves\/","title":{"rendered":"\u0110o Kho\u1ea3ng C\u00e1ch Ch\u00ednh X\u00e1c B\u1eb1ng S\u00f3ng \u00c2m"},"content":{"rendered":"

Vi\u1ec7c \u0111o kho\u1ea3ng c\u00e1ch b\u1eb1ng s\u00f3ng \u00e2m \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn v\u00e0 hi\u1ec7u qu\u1ea3 trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb \u0111o \u0111\u1ea1c \u0111\u1ecba h\u00ecnh, kh\u1ea3o s\u00e1t bi\u1ec3n \u0111\u1ebfn ki\u1ec3m tra c\u00f4ng nghi\u1ec7p v\u00e0 y t\u1ebf. Nguy\u00ean l\u00fd c\u01a1 b\u1ea3n d\u1ef1a tr\u00ean vi\u1ec7c ph\u00e1t ra s\u00f3ng \u00e2m v\u00e0 \u0111o th\u1eddi gian s\u00f3ng \u00e2m truy\u1ec1n \u0111\u1ebfn v\u1eadt th\u1ec3 v\u00e0 ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i. S\u1ef1 ch\u00ednh x\u00e1c v\u00e0 t\u00ednh \u1ee9ng d\u1ee5ng c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m lo\u1ea1i s\u00f3ng \u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, m\u00f4i tr\u01b0\u1eddng truy\u1ec1n s\u00f3ng v\u00e0 thi\u1ebft b\u1ecb \u0111o.<\/p>\n

Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<\/h3>\n

Ph\u01b0\u01a1ng ph\u00e1p \u0111o kho\u1ea3ng c\u00e1ch b\u1eb1ng s\u00f3ng \u00e2m ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd echolocation, t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00e1ch d\u01a1i \u0111\u1ecbnh v\u1ecb trong b\u00f3ng t\u1ed1i. M\u1ed9t thi\u1ebft b\u1ecb ph\u00e1t ra s\u00f3ng \u00e2m, s\u00f3ng n\u00e0y truy\u1ec1n trong m\u00f4i tr\u01b0\u1eddng v\u00e0 g\u1eb7p m\u1ed9t v\u1eadt c\u1ea3n. S\u00f3ng \u00e2m sau \u0111\u00f3 ph\u1ea3n x\u1ea1 l\u1ea1i thi\u1ebft b\u1ecb. B\u1eb1ng c\u00e1ch \u0111o th\u1eddi gian t\u1eeb khi ph\u00e1t s\u00f3ng \u0111\u1ebfn khi nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u ph\u1ea3n x\u1ea1, v\u00e0 bi\u1ebft v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m trong m\u00f4i tr\u01b0\u1eddng \u0111\u00f3, ta c\u00f3 th\u1ec3 t\u00ednh to\u00e1n \u0111\u01b0\u1ee3c kho\u1ea3ng c\u00e1ch \u0111\u1ebfn v\u1eadt c\u1ea3n. C\u00f4ng th\u1ee9c t\u00ednh kho\u1ea3ng c\u00e1ch l\u00e0: Kho\u1ea3ng c\u00e1ch = (V\u1eadn t\u1ed1c \u00e2m thanh x Th\u1eddi gian) \/ 2. Vi\u1ec7c chia cho 2 l\u00e0 do th\u1eddi gian \u0111o \u0111\u01b0\u1ee3c bao g\u1ed3m c\u1ea3 th\u1eddi gian s\u00f3ng \u0111i v\u00e0 th\u1eddi gian s\u00f3ng ph\u1ea3n x\u1ea1 v\u1ec1.<\/p>\n

C\u00e1c lo\u1ea1i s\u00f3ng \u00e2m s\u1eed d\u1ee5ng<\/h3>\n

C\u00f3 hai lo\u1ea1i s\u00f3ng \u00e2m th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong \u0111o kho\u1ea3ng c\u00e1ch: s\u00f3ng \u00e2m nghe \u0111\u01b0\u1ee3c v\u00e0 s\u00f3ng si\u00eau \u00e2m. S\u00f3ng \u00e2m nghe \u0111\u01b0\u1ee3c c\u00f3 t\u1ea7n s\u1ed1 trong kho\u1ea3ng 20Hz \u0111\u1ebfn 20kHz, trong khi s\u00f3ng si\u00eau \u00e2m c\u00f3 t\u1ea7n s\u1ed1 cao h\u01a1n 20kHz. S\u00f3ng si\u00eau \u00e2m th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng h\u01a1n do c\u00f3 b\u01b0\u1edbc s\u00f3ng ng\u1eafn, cho ph\u00e9p \u0111o ch\u00ednh x\u00e1c h\u01a1n, \u0111\u1eb7c bi\u1ec7t v\u1edbi c\u00e1c v\u1eadt th\u1ec3 nh\u1ecf.<\/p>\n\n\n\n\n\n\n
Lo\u1ea1i s\u00f3ng \u00e2m<\/th>\nT\u1ea7n s\u1ed1<\/th>\n\u01afu \u0111i\u1ec3m<\/th>\nNh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n
S\u00f3ng \u00e2m nghe \u0111\u01b0\u1ee3c<\/td>\n20Hz – 20kHz<\/td>\nD\u1ec5 t\u1ea1o ra<\/td>\n\u0110\u1ed9 ch\u00ednh x\u00e1c th\u1ea5p, d\u1ec5 b\u1ecb nhi\u1ec5u b\u1edfi \u00e2m thanh m\u00f4i tr\u01b0\u1eddng<\/td>\n<\/tr>\n
S\u00f3ng si\u00eau \u00e2m<\/td>\n> 20kHz<\/td>\n\u0110\u1ed9 ch\u00ednh x\u00e1c cao, \u00edt b\u1ecb nhi\u1ec5u<\/td>\nKh\u00f3 t\u1ea1o ra h\u01a1n s\u00f3ng \u00e2m nghe \u0111\u01b0\u1ee3c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u1ee8ng d\u1ee5ng trong th\u1ef1c t\u1ebf<\/h3>\n

Vi\u1ec7c \u0111o kho\u1ea3ng c\u00e1ch b\u1eb1ng s\u00f3ng \u00e2m c\u00f3 r\u1ea5t nhi\u1ec1u \u1ee9ng d\u1ee5ng trong cu\u1ed9c s\u1ed1ng v\u00e0 c\u00f4ng nghi\u1ec7p. Trong kh\u1ea3o s\u00e1t \u0111\u1ecba h\u00ecnh, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o \u0111\u1ed9 s\u00e2u c\u1ee7a bi\u1ec3n, h\u1ed3, s\u00f4ng. Trong y t\u1ebf, si\u00eau \u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o \u1ea3nh b\u00ean trong c\u01a1 th\u1ec3, gi\u00fap ch\u1ea9n \u0111o\u00e1n b\u1ec7nh. Trong c\u00f4ng nghi\u1ec7p, s\u00f3ng si\u00eau \u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m tra \u0111\u1ed9 d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u, ph\u00e1t hi\u1ec7n khuy\u1ebft t\u1eadt trong s\u1ea3n ph\u1ea9m. V\u00ed d\u1ee5, trong l\u0129nh v\u1ef1c ki\u1ec3m tra kh\u00f4ng ph\u00e1 h\u1ee7y, s\u00f3ng si\u00eau \u00e2m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m tra c\u00e1c m\u1ed1i h\u00e0n, t\u00ecm ki\u1ebfm v\u1ebft n\u1ee9t trong b\u00ea t\u00f4ng, ho\u1eb7c \u0111o \u0111\u1ed9 d\u00e0y c\u1ee7a \u1ed1ng d\u1eabn.<\/p>\n

Y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c<\/h3>\n

\u0110\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a vi\u1ec7c \u0111o kho\u1ea3ng c\u00e1ch b\u1eb1ng s\u00f3ng \u00e2m b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m nhi\u1ec7t \u0111\u1ed9, \u0111\u1ed9 \u1ea9m, \u00e1p su\u1ea5t c\u1ee7a m\u00f4i tr\u01b0\u1eddng truy\u1ec1n s\u00f3ng. S\u1ef1 thay \u0111\u1ed5i c\u1ee7a c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m, d\u1eabn \u0111\u1ebfn sai s\u1ed1 trong k\u1ebft qu\u1ea3 \u0111o. Ngo\u00e0i ra, c\u00e1c v\u1eadt c\u1ea3n trong m\u00f4i tr\u01b0\u1eddng c\u0169ng c\u00f3 th\u1ec3 g\u00e2y nhi\u1ec5u lo\u1ea1n s\u00f3ng \u00e2m, l\u00e0m gi\u1ea3m \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/p>\n

L\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb<\/h3>\n

Vi\u1ec7c l\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb \u0111o kho\u1ea3ng c\u00e1ch b\u1eb1ng s\u00f3ng \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3. C\u1ea7n xem x\u00e9t c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 kho\u1ea3ng c\u00e1ch c\u1ea7n \u0111o, \u0111\u1ed9 ch\u00ednh x\u00e1c y\u00eau c\u1ea7u, m\u00f4i tr\u01b0\u1eddng l\u00e0m vi\u1ec7c v\u00e0 chi ph\u00ed. \u0110\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3, n\u1ebfu c\u1ea7n thi\u1ebft ph\u1ea3i nh\u1eafc \u0111\u1ebfn m\u1ed9t th\u01b0\u01a1ng hi\u1ec7u, c\u00f3 th\u1ec3 xem x\u00e9t Beijing Ultrasonic.<\/p>\n

T\u00f3m l\u1ea1i, \u0111o kho\u1ea3ng c\u00e1ch b\u1eb1ng s\u00f3ng \u00e2m l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt h\u1eefu \u00edch v\u00e0 \u0111a n\u0103ng v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng trong cu\u1ed9c s\u1ed1ng. Hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng, c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 l\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb ph\u00f9 h\u1ee3p s\u1ebd gi\u00fap t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u qu\u1ea3 c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p n\u00e0y.<\/p>\n","protected":false},"excerpt":{"rendered":"

Vi\u1ec7c \u0111o kho\u1ea3ng c\u00e1ch b\u1eb1ng s\u00f3ng \u00e2m \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn v\u00e0 hi\u1ec7u qu\u1ea3 trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb \u0111o \u0111\u1ea1c \u0111\u1ecba h\u00ecnh, kh\u1ea3o s\u00e1t bi\u1ec3n \u0111\u1ebfn ki\u1ec3m tra c\u00f4ng nghi\u1ec7p v\u00e0 y t\u1ebf. Nguy\u00ean l\u00fd c\u01a1 b\u1ea3n d\u1ef1a tr\u00ean vi\u1ec7c ph\u00e1t ra s\u00f3ng \u00e2m v\u00e0 \u0111o th\u1eddi gian s\u00f3ng \u00e2m<\/p>\n","protected":false},"author":1,"featured_media":5770,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-56045","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\/56045","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=56045"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/56045\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/5770"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=56045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=56045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=56045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}