{"id":56036,"date":"2022-04-16T13:10:08","date_gmt":"2022-04-16T18:10:08","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/what-is-the-proper-distance-between-transducers-and-objects\/"},"modified":"2025-01-21T07:29:35","modified_gmt":"2025-01-21T12:29:35","slug":"what-is-the-proper-distance-between-transducers-and-objects","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/what-is-the-proper-distance-between-transducers-and-objects\/","title":{"rendered":"Kho\u1ea3ng c\u00e1ch l\u00fd t\u01b0\u1edfng gi\u1eefa \u0111\u1ea7u d\u00f2 v\u00e0 v\u1eadt th\u1ec3"},"content":{"rendered":"<p>Kho\u1ea3ng c\u00e1ch gi\u1eefa \u0111\u1ea7u d\u00f2 v\u00e0 v\u1eadt th\u1ec3 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng \u0111o l\u01b0\u1eddng v\u00e0 ki\u1ec3m tra s\u1eed d\u1ee5ng s\u00f3ng si\u00eau \u00e2m. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m lo\u1ea1i \u0111\u1ea7u d\u00f2, t\u1ea7n s\u1ed1 s\u00f3ng si\u00eau \u00e2m, \u0111\u1eb7c t\u00ednh v\u1eadt li\u1ec7u c\u1ee7a v\u1eadt th\u1ec3, v\u00e0 m\u00f4i tr\u01b0\u1eddng truy\u1ec1n d\u1eabn.  Vi\u1ec7c l\u1ef1a ch\u1ecdn kho\u1ea3ng c\u00e1ch kh\u00f4ng ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 \u0111o kh\u00f4ng ch\u00ednh x\u00e1c, nhi\u1ec5u t\u00edn hi\u1ec7u, ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 h\u01b0 h\u1ecfng \u0111\u1ea7u d\u00f2.<\/p>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u<\/h3>\n<p>Kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u gi\u1eefa \u0111\u1ea7u d\u00f2 v\u00e0 v\u1eadt th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 ch\u00ednh:<\/p>\n<ul>\n<li><strong>T\u1ea7n s\u1ed1 s\u00f3ng si\u00eau \u00e2m:<\/strong> T\u1ea7n s\u1ed1 cao h\u01a1n th\u01b0\u1eddng \u0111i k\u00e8m v\u1edbi \u0111\u1ed9 suy gi\u1ea3m t\u00edn hi\u1ec7u nhanh h\u01a1n, do \u0111\u00f3 \u0111\u00f2i h\u1ecfi kho\u1ea3ng c\u00e1ch ng\u1eafn h\u01a1n. T\u1ea7n s\u1ed1 th\u1ea5p h\u01a1n c\u00f3 th\u1ec3 xuy\u00ean qua v\u1eadt li\u1ec7u s\u00e2u h\u01a1n, cho ph\u00e9p kho\u1ea3ng c\u00e1ch l\u1edbn h\u01a1n.<\/li>\n<li><strong>Lo\u1ea1i \u0111\u1ea7u d\u00f2:<\/strong> C\u00e1c lo\u1ea1i \u0111\u1ea7u d\u00f2 kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111\u1ea7u d\u00f2 ti\u1ebfp x\u00fac, \u0111\u1ea7u d\u00f2 ch\u00ecm, ho\u1eb7c \u0111\u1ea7u d\u00f2 g\u00f3c, c\u00f3 c\u00e1c \u0111\u1eb7c t\u00ednh v\u00e0 ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng kh\u00e1c nhau, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kho\u1ea3ng c\u00e1ch l\u00e0m vi\u1ec7c l\u00fd t\u01b0\u1edfng.<\/li>\n<li><strong>\u0110\u1eb7c t\u00ednh v\u1eadt li\u1ec7u:<\/strong> V\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 h\u1ea5p th\u1ee5 \u00e2m cao s\u1ebd y\u00eau c\u1ea7u kho\u1ea3ng c\u00e1ch ng\u1eafn h\u01a1n so v\u1edbi v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 h\u1ea5p th\u1ee5 \u00e2m th\u1ea5p. B\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t, c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u1ea3n x\u1ea1 s\u00f3ng si\u00eau \u00e2m v\u00e0 do \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u.<\/li>\n<li><strong>M\u00f4i tr\u01b0\u1eddng truy\u1ec1n d\u1eabn:<\/strong>  M\u00f4i tr\u01b0\u1eddng truy\u1ec1n d\u1eabn, v\u00ed d\u1ee5 nh\u01b0 kh\u00f4ng kh\u00ed ho\u1eb7c n\u01b0\u1edbc, c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 lan truy\u1ec1n s\u00f3ng si\u00eau \u00e2m.  V\u00ed d\u1ee5, s\u00f3ng si\u00eau \u00e2m lan truy\u1ec1n trong n\u01b0\u1edbc t\u1ed1t h\u01a1n trong kh\u00f4ng kh\u00ed, cho ph\u00e9p kho\u1ea3ng c\u00e1ch l\u1edbn h\u01a1n.<\/li>\n<\/ul>\n<h3>X\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u<\/h3>\n<p>Vi\u1ec7c x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi th\u1ef1c nghi\u1ec7m v\u00e0 hi\u1ec7u ch\u1ec9nh. M\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Th\u1eed nghi\u1ec7m v\u00e0 sai:<\/strong> B\u1eaft \u0111\u1ea7u v\u1edbi m\u1ed9t kho\u1ea3ng c\u00e1ch \u01b0\u1edbc l\u01b0\u1ee3ng v\u00e0 \u0111i\u1ec1u ch\u1ec9nh cho \u0111\u1ebfn khi \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u t\u1ed1t nh\u1ea5t.<\/li>\n<li><strong>S\u1eed d\u1ee5ng bi\u1ec3u \u0111\u1ed3 hi\u1ec7u chu\u1ea9n:<\/strong> M\u1ed9t s\u1ed1 nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p bi\u1ec3u \u0111\u1ed3 hi\u1ec7u chu\u1ea9n cho c\u00e1c lo\u1ea1i \u0111\u1ea7u d\u00f2 c\u1ee5 th\u1ec3, gi\u00fap x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u d\u1ef1a tr\u00ean t\u1ea7n s\u1ed1 v\u00e0 v\u1eadt li\u1ec7u.<\/li>\n<li><strong>Ph\u00e2n t\u00edch t\u00edn hi\u1ec7u:<\/strong> Ph\u00e2n t\u00edch d\u1ea1ng s\u00f3ng ph\u1ea3n x\u1ea1 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch t\u1ea1o ra t\u00edn hi\u1ec7u m\u1ea1nh nh\u1ea5t v\u00e0 r\u00f5 r\u00e0ng nh\u1ea5t.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 v\u1ec1 kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau<\/h3>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>\u1ee8ng d\u1ee5ng<\/th>\n<th>T\u1ea7n s\u1ed1 (MHz)<\/th>\n<th>Kho\u1ea3ng c\u00e1ch \u0111i\u1ec3n h\u00ecnh (mm)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ki\u1ec3m tra m\u1ed1i h\u00e0n<\/td>\n<td>1-10<\/td>\n<td>1-100<\/td>\n<\/tr>\n<tr>\n<td>\u0110o \u0111\u1ed9 d\u00e0y<\/td>\n<td>0.5-5<\/td>\n<td>1-500<\/td>\n<\/tr>\n<tr>\n<td>Ki\u1ec3m tra khuy\u1ebft t\u1eadt trong v\u1eadt li\u1ec7u<\/td>\n<td>2-10<\/td>\n<td>5-200<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Kho\u1ea3ng c\u00e1ch g\u1ea7n v\u00e0 kho\u1ea3ng c\u00e1ch xa<\/h3>\n<p>C\u1ea7n l\u01b0u \u00fd v\u1ec1 v\u00f9ng g\u1ea7n v\u00e0 v\u00f9ng xa c\u1ee7a \u0111\u1ea7u d\u00f2. V\u00f9ng g\u1ea7n l\u00e0 khu v\u1ef1c ngay s\u00e1t \u0111\u1ea7u d\u00f2, n\u01a1i tr\u01b0\u1eddng \u00e2m ch\u01b0a \u1ed5n \u0111\u1ecbnh. V\u00f9ng xa l\u00e0 khu v\u1ef1c xa \u0111\u1ea7u d\u00f2, n\u01a1i c\u01b0\u1eddng \u0111\u1ed9 \u00e2m gi\u1ea3m d\u1ea7n. Vi\u1ec7c \u0111o l\u01b0\u1eddng trong v\u00f9ng g\u1ea7n th\u01b0\u1eddng kh\u00f4ng ch\u00ednh x\u00e1c.<\/p>\n<p>Vi\u1ec7c x\u00e1c \u0111\u1ecbnh v\u00e0 duy tr\u00ec kho\u1ea3ng c\u00e1ch th\u00edch h\u1ee3p gi\u1eefa \u0111\u1ea7u d\u00f2 v\u00e0 v\u1eadt th\u1ec3 l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a c\u00e1c ph\u00e9p \u0111o si\u00eau \u00e2m.  B\u1eb1ng c\u00e1ch xem x\u00e9t c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng v\u00e0 \u00e1p d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u, ng\u01b0\u1eddi s\u1eed d\u1ee5ng c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t c\u1ee7a h\u1ec7 th\u1ed1ng si\u00eau \u00e2m v\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 \u0111o ch\u00ednh x\u00e1c.  Vi\u1ec7c t\u00ecm hi\u1ec3u k\u1ef9 thu\u1eadt s\u1eed d\u1ee5ng v\u00e0 tham kh\u1ea3o t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t c\u0169ng l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kho\u1ea3ng c\u00e1ch gi\u1eefa \u0111\u1ea7u d\u00f2 v\u00e0 v\u1eadt th\u1ec3 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng \u0111o l\u01b0\u1eddng v\u00e0 ki\u1ec3m tra s\u1eed d\u1ee5ng s\u00f3ng si\u00eau \u00e2m. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch t\u1ed1i \u01b0u ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m lo\u1ea1i \u0111\u1ea7u d\u00f2,<\/p>\n","protected":false},"author":1,"featured_media":18630,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-56036","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\/56036","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=56036"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/56036\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/18630"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=56036"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=56036"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=56036"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}