{"id":50236,"date":"2023-04-21T15:12:57","date_gmt":"2023-04-21T20:12:57","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-block-ultrasonic-waves\/"},"modified":"2025-01-21T07:13:50","modified_gmt":"2025-01-21T12:13:50","slug":"how-to-block-ultrasonic-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-block-ultrasonic-waves\/","title":{"rendered":"Ch\u1eb7n s\u00f3ng si\u00eau \u00e2m: Ph\u01b0\u01a1ng ph\u00e1p hi\u1ec7u qu\u1ea3 v\u00e0 \u1ee9ng d\u1ee5ng"},"content":{"rendered":"<p>S\u00f3ng 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\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb y t\u1ebf v\u00e0 c\u00f4ng nghi\u1ec7p cho \u0111\u1ebfn \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y. Tuy nhi\u00ean, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, vi\u1ec7c ng\u0103n ch\u1eb7n ho\u1eb7c gi\u1ea3m thi\u1ec3u s\u1ef1 lan truy\u1ec1n c\u1ee7a s\u00f3ng si\u00eau \u00e2m l\u1ea1i l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 v\u1eadt li\u1ec7u hi\u1ec7u qu\u1ea3 \u0111\u1ec3 ch\u1eb7n s\u00f3ng si\u00eau \u00e2m.<\/p>\n<h3>Nguy\u00ean l\u00fd ch\u1eb7n s\u00f3ng si\u00eau \u00e2m<\/h3>\n<p>Vi\u1ec7c ch\u1eb7n s\u00f3ng si\u00eau \u00e2m d\u1ef1a tr\u00ean nguy\u00ean l\u00fd h\u1ea5p th\u1ee5, ph\u1ea3n x\u1ea1, ho\u1eb7c t\u00e1n x\u1ea1 n\u0103ng l\u01b0\u1ee3ng s\u00f3ng.  V\u1eadt li\u1ec7u v\u00e0 c\u1ea5u tr\u00fac \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a m\u1ed9t ho\u1eb7c k\u1ebft h\u1ee3p nhi\u1ec1u nguy\u00ean l\u00fd n\u00e0y nh\u1eb1m \u0111\u1ea1t hi\u1ec7u qu\u1ea3 cao nh\u1ea5t.  T\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng si\u00eau \u00e2m c\u0169ng \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ch\u1eb7n ph\u00f9 h\u1ee3p.<\/p>\n<h3>S\u1eed d\u1ee5ng v\u1eadt li\u1ec7u h\u1ea5p th\u1ee5<\/h3>\n<p>V\u1eadt li\u1ec7u h\u1ea5p th\u1ee5 s\u00f3ng si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng s\u00f3ng th\u00e0nh nhi\u1ec7t n\u0103ng. C\u00e1c v\u1eadt li\u1ec7u x\u1ed1p, c\u00f3 c\u1ea5u tr\u00fac ph\u1ee9c t\u1ea1p v\u00e0 m\u1eadt \u0111\u1ed9 cao th\u01b0\u1eddng c\u00f3 kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 t\u1ed1t.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>V\u1eadt li\u1ec7u<\/th>\n<th>C\u01a1 ch\u1ebf h\u1ea5p th\u1ee5<\/th>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cao su<\/td>\n<td>Ma s\u00e1t n\u1ed9i t\u1ea1i<\/td>\n<td>Gi\u00e1 th\u00e0nh r\u1ebb, d\u1ec5 gia c\u00f4ng<\/td>\n<td>Hi\u1ec7u qu\u1ea3 h\u1ea5p th\u1ee5 \u1edf t\u1ea7n s\u1ed1 cao h\u1ea1n ch\u1ebf<\/td>\n<\/tr>\n<tr>\n<td>X\u1ed1p<\/td>\n<td>Ma s\u00e1t v\u00e0 t\u00e1n x\u1ea1<\/td>\n<td>Tr\u1ecdng l\u01b0\u1ee3ng nh\u1eb9, d\u1ec5 thi c\u00f4ng<\/td>\n<td>\u0110\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td>V\u1eadt li\u1ec7u composite<\/td>\n<td>K\u1ebft h\u1ee3p nhi\u1ec1u c\u01a1 ch\u1ebf<\/td>\n<td>Hi\u1ec7u su\u1ea5t cao, t\u00f9y ch\u1ec9nh \u0111\u01b0\u1ee3c<\/td>\n<td>Chi ph\u00ed cao<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>S\u1eed d\u1ee5ng v\u1eadt li\u1ec7u ph\u1ea3n x\u1ea1<\/h3>\n<p>V\u1eadt li\u1ec7u ph\u1ea3n x\u1ea1 s\u00f3ng si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch \u0111\u1ed5i h\u01b0\u1edbng s\u00f3ng. B\u1ec1 m\u1eb7t nh\u1eb5n, c\u1ee9ng v\u00e0 c\u00f3 tr\u1edf kh\u00e1ng \u00e2m thanh kh\u00e1c bi\u1ec7t l\u1edbn so v\u1edbi m\u00f4i tr\u01b0\u1eddng truy\u1ec1n s\u00f3ng s\u1ebd ph\u1ea3n x\u1ea1 t\u1ed1t.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>V\u1eadt li\u1ec7u<\/th>\n<th>C\u01a1 ch\u1ebf ph\u1ea3n x\u1ea1<\/th>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Kim lo\u1ea1i (th\u00e9p, nh\u00f4m)<\/td>\n<td>Ph\u1ea3n x\u1ea1 b\u1ec1 m\u1eb7t<\/td>\n<td>\u0110\u1ed9 b\u1ec1n cao, hi\u1ec7u qu\u1ea3 t\u1ed1t<\/td>\n<td>C\u00f3 th\u1ec3 g\u00e2y nhi\u1ec5u x\u1ea1<\/td>\n<\/tr>\n<tr>\n<td>G\u1ea1ch men<\/td>\n<td>Ph\u1ea3n x\u1ea1 b\u1ec1 m\u1eb7t<\/td>\n<td>D\u1ec5 t\u00ecm, gi\u00e1 th\u00e0nh r\u1ebb<\/td>\n<td>Hi\u1ec7u qu\u1ea3 ph\u1ee5 thu\u1ed9c v\u00e0o g\u00f3c t\u1edbi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>T\u1ea1o r\u00e0o c\u1ea3n v\u1eadt l\u00fd<\/h3>\n<p>Vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c r\u00e0o c\u1ea3n v\u1eadt l\u00fd c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p c\u1ea3 hai nguy\u00ean l\u00fd h\u1ea5p th\u1ee5 v\u00e0 ph\u1ea3n x\u1ea1. V\u00ed d\u1ee5, m\u1ed9t b\u1ee9c t\u01b0\u1eddng b\u00ea t\u00f4ng d\u00e0y c\u00f3 th\u1ec3 ch\u1eb7n s\u00f3ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3 nh\u1edd s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa ph\u1ea3n x\u1ea1 t\u1ea1i b\u1ec1 m\u1eb7t v\u00e0 h\u1ea5p th\u1ee5 b\u00ean trong v\u1eadt li\u1ec7u.<\/p>\n<h3>K\u1ef9 thu\u1eadt tri\u1ec7t ti\u00eau s\u00f3ng<\/h3>\n<p>M\u1ed9t ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c l\u00e0 s\u1eed d\u1ee5ng s\u00f3ng si\u00eau \u00e2m th\u1ee9 hai c\u00f3 c\u00f9ng t\u1ea7n s\u1ed1 v\u00e0 bi\u00ean \u0111\u1ed9 nh\u01b0ng l\u1ec7ch pha 180 \u0111\u1ed9 so v\u1edbi s\u00f3ng c\u1ea7n ch\u1eb7n.  S\u1ef1 giao thoa gi\u1eefa hai s\u00f3ng s\u1ebd tri\u1ec7t ti\u00eau l\u1eabn nhau.  K\u1ef9 thu\u1eadt n\u00e0y \u0111\u00f2i h\u1ecfi thi\u1ebft b\u1ecb ph\u1ee9c t\u1ea1p v\u00e0 ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n<p>T\u00f3m l\u1ea1i, vi\u1ec7c ch\u1eb7n s\u00f3ng si\u00eau \u00e2m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nhau, t\u1eeb vi\u1ec7c s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u h\u1ea5p th\u1ee5, ph\u1ea3n x\u1ea1 cho \u0111\u1ebfn c\u00e1c k\u1ef9 thu\u1eadt tri\u1ec7t ti\u00eau s\u00f3ng ph\u1ee9c t\u1ea1p. Vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p t\u1ed1i \u01b0u ph\u1ee5 thu\u1ed9c v\u00e0o y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a t\u1eebng \u1ee9ng d\u1ee5ng, bao g\u1ed3m t\u1ea7n s\u1ed1 s\u00f3ng, c\u01b0\u1eddng \u0111\u1ed9 s\u00f3ng, v\u00e0 \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng.  C\u1ea7n c\u00e2n nh\u1eafc k\u1ef9 l\u01b0\u1ee1ng c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 ch\u1eb7n s\u00f3ng si\u00eau \u00e2m t\u1ed1t nh\u1ea5t.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u00f3ng 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\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb y t\u1ebf v\u00e0 c\u00f4ng nghi\u1ec7p cho \u0111\u1ebfn \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y. Tuy nhi\u00ean, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, vi\u1ec7c ng\u0103n ch\u1eb7n ho\u1eb7c gi\u1ea3m thi\u1ec3u s\u1ef1 lan truy\u1ec1n c\u1ee7a s\u00f3ng si\u00eau \u00e2m l\u1ea1i<\/p>\n","protected":false},"author":1,"featured_media":26471,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-50236","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\/50236","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=50236"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/50236\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26471"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=50236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=50236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=50236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}