{"id":50244,"date":"2023-04-21T15:12:29","date_gmt":"2023-04-21T20:12:29","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-block-ultrasonic-sound-waves\/"},"modified":"2025-01-21T07:13:49","modified_gmt":"2025-01-21T12:13:49","slug":"how-to-block-ultrasonic-sound-waves","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-block-ultrasonic-sound-waves\/","title":{"rendered":"C\u00e1ch ng\u0103n ch\u1eb7n s\u00f3ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3"},"content":{"rendered":"<p>\u00c2m thanh 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, c\u00f4ng nghi\u1ec7p \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 ki\u1ec3m so\u00e1t v\u00e0 ng\u0103n ch\u1eb7n s\u1ef1 lan truy\u1ec1n c\u1ee7a s\u00f3ng si\u00eau \u00e2m l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 tr\u00e1nh nhi\u1ec5u lo\u1ea1n, \u0111\u1ea3m b\u1ea3o an to\u00e0n ho\u1eb7c b\u1ea3o v\u1ec7 quy\u1ec1n ri\u00eang t\u01b0. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o c\u00e1c ph\u01b0\u01a1ng ph\u00e1p 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 \u00c2m<\/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 chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng si\u00eau \u00e2m th\u00e0nh c\u00e1c d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c nh\u01b0 nhi\u1ec7t ho\u1eb7c l\u00e0m l\u1ec7ch h\u01b0\u1edbng lan truy\u1ec1n c\u1ee7a s\u00f3ng.<\/p>\n<h3>V\u1eadt Li\u1ec7u H\u1ea5p Th\u1ee5 \u00c2m Thanh<\/h3>\n<p>M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u c\u00f3 kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 n\u0103ng l\u01b0\u1ee3ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3. V\u1eadt li\u1ec7u x\u1ed1p, v\u1eadt li\u1ec7u c\u00f3 c\u1ea5u tr\u00fac l\u1ed7 r\u1ed7ng, v\u00e0 m\u1ed9t s\u1ed1 lo\u1ea1i cao su \u0111\u1eb7c bi\u1ec7t th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.  B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y so s\u00e1nh kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 c\u1ee7a m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u ph\u1ed5 bi\u1ebfn:<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>V\u1eadt Li\u1ec7u<\/th>\n<th>H\u1ec7 S\u1ed1 H\u1ea5p Th\u1ee5<\/th>\n<th>T\u1ea7n S\u1ed1 Si\u00eau \u00c2m (kHz)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cao su x\u1ed1p<\/td>\n<td>0.8<\/td>\n<td>20-100<\/td>\n<\/tr>\n<tr>\n<td>B\u00f4ng kho\u00e1ng<\/td>\n<td>0.7<\/td>\n<td>20-50<\/td>\n<\/tr>\n<tr>\n<td>V\u1ea3i n\u1ec9<\/td>\n<td>0.6<\/td>\n<td>10-30<\/td>\n<\/tr>\n<tr>\n<td>G\u1ed7 \u00e9p<\/td>\n<td>0.3<\/td>\n<td>20-50<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>C\u1ea5u Tr\u00fac Ph\u1ea3n X\u1ea1 \u00c2m Thanh<\/h3>\n<p>B\u1ec1 m\u1eb7t c\u1ee9ng, ph\u1eb3ng v\u00e0 nh\u1eb5n c\u00f3 kh\u1ea3 n\u0103ng ph\u1ea3n x\u1ea1 s\u00f3ng si\u00eau \u00e2m. Vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c t\u1ea5m kim lo\u1ea1i, k\u00ednh ho\u1eb7c nh\u1ef1a c\u1ee9ng c\u00f3 th\u1ec3 t\u1ea1o ra hi\u1ec7u \u1ee9ng ph\u1ea3n x\u1ea1 \u0111\u00e1ng k\u1ec3.  G\u00f3c t\u1edbi c\u1ee7a s\u00f3ng si\u00eau \u00e2m c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u qu\u1ea3 ph\u1ea3n x\u1ea1.<\/p>\n<h3>T\u00e1n X\u1ea1 \u00c2m Thanh<\/h3>\n<p>C\u1ea5u tr\u00fac b\u1ec1 m\u1eb7t kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u, g\u1ed3 gh\u1ec1 ho\u1eb7c c\u00f3 nhi\u1ec1u v\u1eadt c\u1ea3n nh\u1ecf c\u00f3 th\u1ec3 t\u00e1n x\u1ea1 s\u00f3ng si\u00eau \u00e2m theo nhi\u1ec1u h\u01b0\u1edbng kh\u00e1c nhau, l\u00e0m gi\u1ea3m c\u01b0\u1eddng \u0111\u1ed9 s\u00f3ng t\u1ea1i m\u1ed9t \u0111i\u1ec3m c\u1ee5 th\u1ec3.<\/p>\n<h3>\u1ee8ng D\u1ee5ng C\u1ee7a Vi\u1ec7c Ch\u1eb7n S\u00f3ng Si\u00eau \u00c2m<\/h3>\n<p>Vi\u1ec7c ch\u1eb7n s\u00f3ng si\u00eau \u00e2m \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c:<\/p>\n<ul>\n<li><strong>Y t\u1ebf:<\/strong>  Ng\u0103n ch\u1eb7n nhi\u1ec5u lo\u1ea1n gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb si\u00eau \u00e2m.<\/li>\n<li><strong>C\u00f4ng nghi\u1ec7p:<\/strong>  Ki\u1ec3m so\u00e1t ti\u1ebfng \u1ed3n trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t s\u1eed d\u1ee5ng si\u00eau \u00e2m.<\/li>\n<li><strong>\u0110\u1eddi s\u1ed1ng:<\/strong>  Gi\u1ea3m thi\u1ec3u t\u00e1c \u0111\u1ed9ng c\u1ee7a s\u00f3ng si\u00eau \u00e2m t\u1eeb c\u00e1c thi\u1ebft b\u1ecb gia \u0111\u00ecnh.<\/li>\n<\/ul>\n<h3>Thi\u1ebft K\u1ebf H\u1ec7 Th\u1ed1ng Ch\u1eb7n S\u00f3ng Si\u00eau \u00c2m<\/h3>\n<p>Vi\u1ec7c thi\u1ebft k\u1ebf m\u1ed9t h\u1ec7 th\u1ed1ng ch\u1eb7n s\u00f3ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3 c\u1ea7n xem x\u00e9t c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 t\u1ea7n s\u1ed1 si\u00eau \u00e2m, c\u01b0\u1eddng \u0111\u1ed9 s\u00f3ng, m\u00f4i tr\u01b0\u1eddng xung quanh v\u00e0 y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a \u1ee9ng d\u1ee5ng.  K\u1ebft h\u1ee3p c\u00e1c ph\u01b0\u01a1ng ph\u00e1p h\u1ea5p th\u1ee5, ph\u1ea3n x\u1ea1 v\u00e0 t\u00e1n x\u1ea1 th\u01b0\u1eddng mang l\u1ea1i hi\u1ec7u qu\u1ea3 t\u1ed1t nh\u1ea5t.<\/p>\n<p>T\u00f3m l\u1ea1i, vi\u1ec7c ch\u1eb7n s\u00f3ng si\u00eau \u00e2m c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u h\u1ea5p th\u1ee5, c\u1ea5u tr\u00fac ph\u1ea3n x\u1ea1 ho\u1eb7c t\u00e1n x\u1ea1 \u00e2m thanh.  L\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a t\u1eebng \u1ee9ng d\u1ee5ng. Hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd v\u00e0 c\u00e1c k\u1ef9 thu\u1eadt ch\u1eb7n s\u00f3ng si\u00eau \u00e2m s\u1ebd gi\u00fap ch\u00fang ta ki\u1ec3m so\u00e1t v\u00e0 s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 n\u00e0y m\u1ed9t c\u00e1ch an to\u00e0n v\u00e0 hi\u1ec7u qu\u1ea3.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00c2m thanh 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, c\u00f4ng nghi\u1ec7p \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 ki\u1ec3m so\u00e1t v\u00e0 ng\u0103n ch\u1eb7n s\u1ef1 lan truy\u1ec1n c\u1ee7a s\u00f3ng si\u00eau \u00e2m l\u00e0 c\u1ea7n<\/p>\n","protected":false},"author":1,"featured_media":26476,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-50244","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\/50244","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=50244"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/50244\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26476"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=50244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=50244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=50244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}