Trong \u0111\u1eddi s\u1ed1ng h\u1eb1ng ng\u00e0y, vi\u1ec7c n\u1ea5u n\u01b0\u1edbng th\u1ee9c \u0103n ph\u1ea7n nhi\u1ec1u d\u00f9ng ch\u1ea3o gang s\u1eaft \u0111\u00e1y h\u00ecnh cong. C\u00f2n khi th\u1ed5i c\u01a1m n\u1ea5u ch\u00e1o th\u00ec ph\u1ea7n nhi\u1ec1u d\u00f9ng n\u1ed3i \u0111\u00e1y ph\u1eb3ng b\u1eb1ng nh\u00f4m ho\u1eb7c in\u1ed1c, t\u1ef1a h\u1ed3 ch\u1eb3ng c\u00f3 quy \u0111\u1ecbnh nghi\u00eam ng\u1eb7t g\u00ec c\u1ea3. Tuy nhi\u00ean, th\u1ed5i c\u01a1m b\u1eb1ng l\u00f2 \u0111i\u1ec7n t\u1eeb l\u1ea1i y\u00eau c\u1ea7u d\u00f9ng n\u1ed3i s\u1eaft \u0111\u00e1y ph\u1eb3ng. T\u1ea1i sao v\u1eady?<\/p>\n\n\n\n
Ho\u00e1 ra l\u00e0 \u0111i\u1ec1u \u0111\u00f3 c\u00f3 li\u00ean quan v\u1edbi nguy\u00ean l\u00ed c\u00f4ng t\u00e1c c\u1ee7a l\u00f2 \u0111i\u1ec7n t\u1eeb. L\u00f2 \u0111i\u1ec7n t\u1eeb ch\u1ee7 y\u1ebfu do b\u1ed9 ph\u1eadn bi\u1ebfn t\u1ea7n, cu\u1ed9n d\u00e2y c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb, t\u1ea5m k\u00ednh vi tinh th\u1ec3 h\u1ee3p th\u00e0nh. Sau khi c\u1eafm d\u00e2y v\u00e0o \u1ed5 \u0111i\u1ec7n v\u00e0 b\u1eadt c\u00f4ng t\u1eafc l\u00f2, b\u1ed9 ph\u1eadn bi\u1ebfn t\u1ea7n l\u1eadp t\u1ee9c \u0111\u1ed5i \u0111i\u1ec7n th\u00e0nh ph\u1ed1 c\u00f3 t\u1ea7n s\u1ed1 50 Hz th\u00e0nh d\u00f2ng \u0111i\u1ec7n cao t\u1ea7n c\u00f3 t\u1ea7n s\u1ed1 40 kHz, \u0111\u1eb7t l\u00ean cu\u1ed9n d\u00e2y c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb. C\u0103n c\u1ee9 v\u00e0o nguy\u00ean l\u00ed c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb, xung quanh cu\u1ed9n d\u00e2y s\u1ebd h\u00ecnh th\u00e0nh t\u1eeb tr\u01b0\u1eddng m\u1ea1nh. H\u01b0\u1edbng c\u1ee7a t\u1eeb tr\u01b0\u1eddng bi\u1ebfn \u0111\u1ed5i theo s\u1ef1 bi\u1ebfn \u0111\u1ed5i h\u01b0\u1edbng c\u1ee7a d\u00f2ng \u0111i\u1ec7n \u0111\u1eb7t l\u00ean cu\u1ed9n d\u00e2y. Trong k\u0129 thu\u1eadt \u0111i\u1ec7n t\u1eed, lo\u1ea1i t\u1eeb tr\u01b0\u1eddng lu\u00e2n phi\u00ean \u0111\u1ed5i h\u01b0\u1edbng n\u00e0y g\u1ecdi l\u00e0 t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean. Khi \u1ea5y, t\u1ea7n s\u1ed1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean (xoay chi\u1ec1u) trong l\u00f2 \u0111i\u1ec7n t\u1eeb c\u0169ng l\u00e0 40 kHz.<\/p>\n\n\n\n
Trong t\u1eeb tr\u01b0\u1eddng bi\u1ebfn \u0111\u1ed5i v\u1edbi t\u1ea7n s\u1ed1 cao nh\u01b0 v\u1eady, n\u1ebfu \u0111\u1eb7t m\u1ed9t t\u1ea5m kim lo\u1ea1i v\u00e0o, c\u0169ng c\u0103n c\u1ee9 theo nguy\u00ean l\u00ed c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb t\u1eeb tr\u01b0\u1eddng thay \u0111\u1ed5i c\u0169ng s\u1ebd c\u1ea3m \u1ee9ng ra d\u00f2ng \u0111i\u1ec7n \u1edf l\u1edbp m\u1eb7t c\u1ee7a t\u1ea5m kim lo\u1ea1i. H\u01b0\u1edbng ch\u1ea1y c\u1ee7a d\u00f2ng \u0111i\u1ec7n n\u00e0y gi\u1ed1ng nh\u01b0 xo\u00e1y n\u01b0\u1edbc trong s\u00f4ng, n\u00ean c\u00f3 t\u00ean l\u00e0 d\u00f2ng \u0111i\u1ec7n xo\u00e1y. T\u1eeb tr\u01b0\u1eddng c\u00e0ng m\u1ea1nh, t\u1ea7n s\u1ed1 bi\u1ebfn \u0111\u1ed5i c\u00e0ng cao, d\u00f2ng \u0111i\u1ec7n xo\u00e1y c\u00e0ng l\u1edbn. D\u00f2ng \u0111i\u1ec7n xo\u00e1y ch\u1ea1y trong l\u1edbp m\u1eb7t c\u1ee7a t\u1ea5m kim lo\u1ea1i s\u1ebd sinh ra nhi\u1ec7t tr\u00ean \u0111i\u1ec7n tr\u1edf c\u1ee7a l\u1edbp m\u1eb7t t\u1ea5m kim lo\u1ea1i, v\u00e0 t\u00e1n ph\u00e1t ra. Tr\u1ecb s\u1ed1 \u0111i\u1ec7n tr\u1edf trong m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch c\u1ee7a t\u1ea5m kim lo\u1ea1i (\u0111i\u1ec7n tr\u1edf su\u1ea5t) c\u00e0ng l\u1edbn, nhi\u1ec7t l\u01b0\u1ee3ng t\u00e1n ph\u00e1t ra c\u0169ng c\u00e0ng nhi\u1ec1u. Gia c\u00f4ng t\u1ea5m kim lo\u1ea1i th\u00e0nh c\u00e1i n\u1ed3i, \u0111\u1eb7t b\u00ean c\u1ea1nh cu\u1ed9n d\u00e2y c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb th\u00ec c\u00f3 th\u1ec3 \u0111\u1ed1t n\u00f3ng n\u1ed3i, d\u00f9ng \u0111\u1ec3 th\u1ed5i c\u01a1m, n\u1ea5u th\u1ee9c \u0103n. \u0110\u00f3 t\u1ee9c l\u00e0 nguy\u00ean l\u00ed c\u00f4ng t\u00e1c c\u1ee7a l\u00f2 \u0111i\u1ec7n t\u1eeb.<\/p>\n\n\n\n
Nh\u01b0ng, c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean t\u1ea1i c\u00e1c \u0111i\u1ec3m kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u. C\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng \u1edf g\u1ea7n hai \u0111\u1ea7u cu\u1ed9n d\u00e2y cao nh\u1ea5t. C\u00f2n \u0111i\u1ec7n tr\u1edf su\u1ea5t c\u1ee7a kim lo\u1ea1i c\u0169ng kh\u00e1c nhau. \u1ede trong c\u00f9ng m\u1ed9t t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean, \u0111i\u1ec7n tr\u1edf c\u1ee7a s\u1eaft g\u1ea5p kho\u1ea3ng v\u00e0i ch\u1ee5c l\u1ea7n c\u1ee7a \u0111\u1ed3ng v\u00e0 nh\u00f4m. Qua \u0111\u00f3 c\u00f3 th\u1ec3 th\u1ea5y, \u0111\u1ec3 trong n\u1ed3i sinh ra nhi\u1ec1u nhi\u1ec7t l\u01b0\u1ee3ng h\u01a1n, n\u00e2ng cao nhi\u1ec7t \u0111\u1ed9 trong n\u1ed3i, ph\u1ea3i \u0111\u1eb7t n\u1ed3i \u0111\u00e1y ph\u1eb3ng b\u00ean tr\u00ean cu\u1ed9n d\u00e2y \u0111i\u1ec7n t\u1eeb, so v\u1edbi n\u1ed3i c\u00f3 \u0111\u00e1y h\u00ecnh cong th\u00ec n\u00f3 c\u00e0ng s\u00e1t k\u1ec1 nh\u1eefng n\u01a1i c\u00f3 t\u1eeb tr\u01b0\u1eddng m\u1ea1nh nh\u1ea5t \u1edf hai \u0111\u1ea7u cu\u1ed9n d\u00e2y \u0111i\u1ec7n t\u1eeb. C\u00f2n d\u00f9ng n\u1ed3i s\u1eaft, so v\u1edbi n\u1ed3i nh\u00f4m ho\u1eb7c n\u1ed3i \u0111\u1ed3ng, n\u00f3 c\u00e0ng t\u0103ng nhi\u1ec1u nhi\u1ec7t l\u01b0\u1ee3ng ph\u00e1t t\u00e1n ra trong n\u1ed3i, r\u00fat ng\u1eafn th\u1eddi gian \u0111un n\u1ea5u.<\/p>\n\n\n\n
Ngo\u00e0i ra, t\u1ea5m k\u00ednh vi tinh th\u1ec3 l\u00e0m b\u1ec7 l\u00f2 c\u1ee7a l\u00f2 \u0111i\u1ec7n t\u1eeb c\u0169ng \u0111\u01b0\u1ee3c gia c\u00f4ng th\u00e0nh d\u1ea1ng ph\u1eb3ng \u0111\u1ec3 kh\u1edbp v\u1edbi n\u1ed3i \u0111\u00e1y ph\u1eb3ng, l\u00e0m cho n\u1ed3i \u0111\u01b0\u1ee3c \u0111\u1eb7t m\u1ed9t c\u00e1ch v\u1eefng ch\u1eafc l\u00ean tr\u00ean l\u00f2 \u0111i\u1ec7n. L\u00f2 \u0111i\u1ec7n t\u1eeb s\u1eed d\u1ee5ng an to\u00e0n, kh\u00f4ng c\u00f3 l\u1eeda. V\u1ea3 l\u1ea1i, b\u1ea3n th\u00e2n n\u1ed3i s\u1eaft l\u00e0 ch\u1ea5t ph\u00e1t nhi\u1ec7t, so v\u1edbi c\u00e1c l\u00f2 nhi\u1ec7t ch\u1ea1y b\u1eb1ng \u0111i\u1ec7n kh\u00e1c, l\u00f2 \u0111i\u1ec7n t\u1eeb ch\u1eb3ng nh\u1eefng n\u00f3ng nhanh h\u01a1n, m\u00e0 c\u00f2n ti\u1ebft ki\u1ec7m \u0111i\u1ec7n h\u01a1n.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: L\u00f2 \u0111i\u1ec7n t\u1eeb; C\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb; \u0110i\u1ec7n th\u00e0nh ph\u1ed1; D\u00f2ng \u0111i\u1ec7n cao t\u1ea7n; T\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean; D\u00f2ng \u0111i\u1ec7n xo\u00e1y.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Trong \u0111\u1eddi s\u1ed1ng h\u1eb1ng ng\u00e0y, vi\u1ec7c n\u1ea5u n\u01b0\u1edbng th\u1ee9c \u0103n ph\u1ea7n nhi\u1ec1u d\u00f9ng ch\u1ea3o gang s\u1eaft \u0111\u00e1y h\u00ecnh cong. C\u00f2n khi th\u1ed5i c\u01a1m n\u1ea5u ch\u00e1o th\u00ec ph\u1ea7n nhi\u1ec1u d\u00f9ng n\u1ed3i \u0111\u00e1y ph\u1eb3ng b\u1eb1ng nh\u00f4m ho\u1eb7c in\u1ed1c, t\u1ef1a h\u1ed3 ch\u1eb3ng c\u00f3 quy \u0111\u1ecbnh nghi\u00eam ng\u1eb7t g\u00ec c\u1ea3. Tuy nhi\u00ean, th\u1ed5i c\u01a1m b\u1eb1ng l\u00f2 \u0111i\u1ec7n t\u1eeb l\u1ea1i […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,7],"tags":[],"class_list":["post-5866","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5866","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=5866"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5866\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}