V\u00e0o ban \u0111\u00eam, khi \u0111i \u00f4 t\u00f4 tr\u00ean \u0111\u01b0\u1eddng cao t\u1ed1c, b\u1ea1n s\u1ebd th\u1ea5y c\u00e1c \u00f4 t\u00f4 ch\u1ea1y \u1edf ph\u00eda tr\u01b0\u1edbc \u0111\u1ee7 m\u00e0u s\u1eafc r\u1ef1c r\u1ee1, nh\u1eefng bi\u1ec3n b\u00e1o b\u00ean \u0111\u01b0\u1eddng s\u00e1ng l\u1ea5p l\u00e1nh nh\u01b0 \u0111\u00e8n m\u00e0u ng\u00e0y l\u1ec5, ng\u00e0y t\u1ebft, c\u00e1c v\u1ea1ch k\u1ebb tr\u00ean m\u1eb7t \u0111\u01b0\u1eddng r\u00f5 r\u00e0ng s\u00e1ng lo\u00e1ng ch\u1ec9 h\u01b0\u1edbng ti\u1ebfn l\u00ean c\u1ee7a \u00f4 t\u00f4. Tuy nhi\u00ean, n\u1ebfu b\u1ea1n quay \u0111\u1ea7u nh\u00ecn ra sau, b\u1ea1n s\u1ebd kh\u00f4ng c\u00f2n th\u1ea5y c\u1ea3nh r\u1ef1c r\u1ee1 \u1ea5y n\u1eefa, ch\u1ec9 th\u1ea5y m\u1ed9t m\u00e0n \u0111\u00eam t\u1ed1i b\u01b0ng, ngay c\u1ea3 \u0111\u00e8n \u0111\u01b0\u1eddng th\u00f4ng th\u01b0\u1eddng c\u0169ng kh\u00f4ng th\u1ea5y. T\u1ea1i sao v\u1eady?<\/p>\n\n\n\n
Tr\u00ean \u0111\u01b0\u1eddng c\u00e1i th\u00f4ng th\u01b0\u1eddng, n\u00f3i chung \u0111\u1ec1u c\u00f3 \u0111\u00e8n chi\u1ebfu s\u00e1ng. Nh\u01b0ng \u0111\u1ed9 chi\u1ebfu s\u00e1ng c\u1ee7a \u0111\u00e8n \u0111\u01b0\u1eddng r\u1ea5t k\u00e9m, ngo\u00e0i ra, c\u00f2n ph\u00e1t ra \u00e1nh s\u00e1ng khu\u1ebfch t\u00e1n, d\u1ec5 khi\u1ebfn cho ng\u01b0\u1eddi l\u00e1i lo\u00e1 m\u1eaft, c\u00f3 l\u00fac l\u1ea1i g\u00e2y kh\u00f3 kh\u0103n cho vi\u1ec7c nh\u1eadn bi\u1ebft c\u00e1c bi\u1ec3n b\u00e1o giao th\u00f4ng, v\u1ea1ch k\u1ebb ch\u1ec9 d\u1eabn m\u1eb7t \u0111\u01b0\u1eddng v\u00e0 c\u00e1c ch\u01b0\u1edbng ng\u1ea1i v\u1eadt. L\u01b0u l\u01b0\u1ee3ng xe tr\u00ean \u0111\u01b0\u1eddng cao t\u1ed1c t\u01b0\u01a1ng \u0111\u1ed1i l\u1edbn, t\u1ed1c \u0111\u1ed9 nhanh, y\u00eau c\u1ea7u chi\u1ebfu s\u00e1ng cao, n\u1ebfu v\u00ec \u00e1nh s\u00e1ng \u0111\u00e8n \u0111\u01b0\u1eddng chi\u1ebfu xu\u1ed1ng m\u00e0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 quan s\u00e1t c\u1ee7a ng\u01b0\u1eddi l\u00e1i xe th\u00ec s\u1ebd r\u1ea5t nguy hi\u1ec3m. Do \u0111\u00f3, tr\u1eeb nh\u1eefng \u0111o\u1ea1n \u0111\u01b0\u1eddng m\u00e0 \u1edf d\u1ecdc \u0111\u01b0\u1eddng c\u00f3 tr\u1ea1m b\u01a1m x\u0103ng, tr\u1ea1m s\u1eeda ch\u1eefa, b\u1ed1t \u0111i\u1ec1u khi\u1ec3n, v.v., n\u00f3i chung tr\u00ean \u0111\u01b0\u1eddng cao t\u1ed1c kh\u00f4ng d\u00f9ng \u0111\u00e8n \u0111\u01b0\u1eddng \u0111\u1ec3 chi\u1ebfu s\u00e1ng. Tuy nhi\u00ean, khi l\u00e1i xe tr\u00ean \u0111\u01b0\u1eddng cao t\u1ed1c, c\u0169ng kh\u00f4ng ph\u1ea3i t\u1ed1i \u0111en nh\u01b0 m\u1ef1c. Ng\u01b0\u1eddi ta \u0111\u00e3 d\u00f9ng m\u1ed9t lo\u1ea1i v\u1eadt li\u1ec7u m\u1edbi – m\u00e0ng ph\u1ea3n quang \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o b\u1eb1ng nh\u1eefng h\u1ea1t thu\u1ef7 tinh c\u1ef1c nh\u1ecf, m\u00e0ng n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c ph\u1ee7 l\u00ean c\u00e1c bi\u1ec3n b\u00e1o giao th\u00f4ng, c\u00e1c v\u1ea1ch k\u1ebb ch\u1ec9 d\u1eabn m\u1eb7t \u0111\u01b0\u1eddng v\u00e0 c\u00e1c thi\u1ebft b\u1ecb c\u1ee7a v\u1eadt ki\u1ebfn tr\u00fac kh\u00e1c, tr\u1edf th\u00e0nh nh\u1eefng bi\u1ec3n b\u00e1o ph\u1ea3n quang. B\u00ecnh th\u01b0\u1eddng ch\u00fang kh\u00f4ng ph\u00e1t quang, ch\u1ec9 khi n\u00e0o \u0111\u00e8n pha \u00f4 t\u00f4 chi\u1ebfu v\u00e0o, ch\u00fang m\u1edbi ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng tr\u1edf l\u1ea1i m\u1eaft ng\u01b0\u1eddi l\u00e1i. Lo\u1ea1i bi\u1ec3n b\u00e1o ph\u1ea3n quang n\u00e0y c\u00f3 hi\u1ec7u su\u1ea5t ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng l\u1edbn g\u1ea5p tr\u0103m l\u1ea7n lo\u1ea1i s\u01a1n th\u00f4ng th\u01b0\u1eddng, c\u00f3 th\u1ec3 ph\u1ea3n x\u1ea1 \u0111\u1ebfn 1000 m. C\u00f3 ngh\u0129a l\u00e0, ng\u01b0\u1eddi l\u00e1i \u1edf xa ngo\u00e0i 1000 m c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c c\u00e1c \u0111i\u1ec3m ph\u00e1t quang \u0111\u00f3; \u1edf ch\u1ed7 c\u00e1ch 400 m c\u00f3 th\u1ec3 ph\u00e2n bi\u1ec7t m\u00e0u s\u1eafc h\u00ecnh v\u1ebd v\u00e0 k\u00fd hi\u1ec7u c\u1ee7a bi\u1ec3n b\u00e1o hi\u1ec7u, \u1edf c\u00e1ch tr\u00ean d\u01b0\u1edbi 200 m c\u00f2n c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y r\u00f5 c\u00e1c ch\u1eef tr\u00ean bi\u1ec3n b\u00e1o. Nh\u1edd v\u1eady m\u00e0 b\u1ea3o \u0111\u1ea3m ch\u1ea1y ban \u0111\u00eam \u0111\u01b0\u1ee3c an to\u00e0n.<\/p>\n\n\n\n
M\u00e0ng ph\u1ea3n quang b\u1eb1ng h\u1ea1t thu\u1ef7 tinh c\u1ef1c nh\u1ecf \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng thu\u1ef7 tinh quang h\u1ecdc c\u00f3 ch\u1ec9 s\u1ed1 kh\u00fac x\u1ea1 cao, sau \u0111\u00f3 \u0111em d\u00e1n l\u00ean m\u00e0ng kim lo\u1ea1i. \u0110\u01b0\u1eddng k\u00ednh c\u1ee7a h\u1ea1t thu\u1ef7 tinh ch\u1ec9 b\u1eb1ng 1\/2 \u0111\u01b0\u1eddng k\u00ednh s\u1ee3i t\u00f3c. Th\u00f4ng th\u01b0\u1eddng, s\u1ef1 ph\u1ea3n x\u1ea1 c\u1ee7a v\u1eadt th\u1ec3 tr\u00ean \u0111\u01b0\u1eddng \u0111\u1ed1i v\u1edbi \u00e1nh s\u00e1ng \u0111\u00e8n l\u00e0 ph\u1ea3n x\u1ea1 ch\u00e2n kh\u00f4ng c\u00f3 quy t\u1eafc. Ngh\u0129a l\u00e0 h\u1ea7u h\u1ebft \u00e1nh s\u00e1ng \u0111\u1ec1u ph\u1ea3n x\u1ea1 ra xung quanh m\u1ed9t c\u00e1ch l\u00e3ng ph\u00ed, ch\u1ec9 c\u00f3 m\u1ed9t b\u1ed9 ph\u1eadn nh\u1ecf ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i ngu\u1ed3n s\u00e1ng, do t\u00e1c d\u1ee5ng kh\u00fac x\u1ea1 c\u1ee7a c\u00e1c h\u1ea1t th\u1ee7y tinh v\u00e0 t\u00e1c d\u1ee5ng ph\u1ea3n x\u1ea1 c\u1ee7a m\u00e0ng kim lo\u1ea1i khi\u1ebfn cho tia s\u00e1ng ph\u1ea3n x\u1ea1 song song \u0111\u1ecbnh h\u01b0\u1edbng tr\u1edf v\u1ec1 ngu\u1ed3n s\u00e1ng, l\u00e0m cho m\u1eb7t ph\u1eb3ng \u0111\u01b0\u1ee3c chi\u1ebfu s\u00e1ng c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y t\u1ed1t nh\u1ea5t. Do \u0111\u00f3, m\u00e0ng ph\u1ea3n quang c\u00f3 th\u1ec3 ph\u00e1t ra \u00e1nh s\u00e1ng r\u1ef1c r\u1ee1 trong b\u00f3ng t\u1ed1i, m\u00e0 b\u1ea3n th\u00e2n kh\u00f4ng c\u1ea7n ti\u00eau t\u1ed1n n\u0103ng l\u01b0\u1ee3ng.<\/p>\n\n\n\n
Hi\u1ec7n nay, v\u1eadt li\u1ec7u ph\u1ea3n quang kh\u00f4ng nh\u1eefng d\u00f9ng tr\u00ean \u0111\u01b0\u1eddng m\u00e0 c\u00f2n \u0111\u01b0\u1ee3c d\u00f9ng tr\u00ean trang ph\u1ee5c c\u1ee7a nh\u00e2n vi\u00ean qu\u1ea3n l\u00fd giao th\u00f4ng, tr\u00ean c\u1eb7p s\u00e1ch c\u1ee7a h\u1ecdc sinh<\/a>, tr\u00ean l\u1ed1p xe \u0111\u1ea1p, v.v., n\u00f3 s\u1ebd ph\u00e1t huy t\u00e1c d\u1ee5ng \u0111\u1ed1i v\u1edbi c\u00f4ng t\u00e1c an to\u00e0n giao th\u00f4ng.<\/p>\n\n\n\n T\u1eeb kh\u00f3a: \u0110\u01b0\u1eddng cao t\u1ed1c; Bi\u1ec3n b\u00e1o ph\u1ea3n quang; \u0110\u00e8n \u0111\u01b0\u1eddng<\/p>\n","protected":false},"excerpt":{"rendered":" V\u00e0o ban \u0111\u00eam, khi \u0111i \u00f4 t\u00f4 tr\u00ean \u0111\u01b0\u1eddng cao t\u1ed1c, b\u1ea1n s\u1ebd th\u1ea5y c\u00e1c \u00f4 t\u00f4 ch\u1ea1y \u1edf ph\u00eda tr\u01b0\u1edbc \u0111\u1ee7 m\u00e0u s\u1eafc r\u1ef1c r\u1ee1, nh\u1eefng bi\u1ec3n b\u00e1o b\u00ean \u0111\u01b0\u1eddng s\u00e1ng l\u1ea5p l\u00e1nh nh\u01b0 \u0111\u00e8n m\u00e0u ng\u00e0y l\u1ec5, ng\u00e0y t\u1ebft, c\u00e1c v\u1ea1ch k\u1ebb tr\u00ean m\u1eb7t \u0111\u01b0\u1eddng r\u00f5 r\u00e0ng s\u00e1ng lo\u00e1ng ch\u1ec9 h\u01b0\u1edbng ti\u1ebfn l\u00ean […]<\/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":[15,16],"tags":[],"class_list":["post-8808","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-ky-thuat"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8808","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=8808"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8808\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=8808"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=8808"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=8808"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}