\u0110\u0129a quang VCD gi\u00e1 r\u1ebb, \u0111\u1eb9p l\u00e0 m\u1ed9t trong nh\u1eefng lo\u1ea1i \u0111\u0129a s\u1ed1 ho\u00e1 d\u00f9ng tia laze \u0111\u01b0\u1ee3c m\u1ecdi ng\u01b0\u1eddi \u01b0a th\u00edch. V\u1edbi m\u1ed9t chi\u1ebfc \u0111\u0129a nh\u1ecf \u0111\u01b0\u1eddng k\u00ednh 12cm, d\u00e0y 1,2mm l\u00e0 lo\u1ea1i \u0111\u1ed3 v\u1eadt k\u1ef9 thu\u1eadt cao, h\u1ed9i \u0111\u1ee7 c\u00e1c y\u1ebfu t\u1ed1 k\u1ef9 thu\u1eadt cao nh\u01b0: K\u1ef9 thu\u1eadt tia laze, k\u1ef9 thu\u1eadt s\u1ed1 ho\u00e1, k\u1ef9 thu\u1eadt t\u00ednh to\u00e1n.<\/p>\n\n\n\n
\u0110\u0129a quang VCD c\u00f3 c\u00f4ng n\u0103ng ghi, l\u01b0u tr\u1eef v\u00e0 ph\u00e1t l\u1ea1i \u00e2m thanh, h\u00ecnh t\u01b0\u1ee3ng, ch\u1eef s\u1ed1, tin t\u1ee9c\u2026 Trong \u0111\u00f3 \u0111i\u1ec1u h\u1ebft s\u1ee9c quan tr\u1ecdng l\u00e0 v\u1eadt li\u1ec7u ghi b\u1eb1ng quang h\u1ecdc. Nguy\u00ean l\u00fd c\u1ee7a k\u1ef9 thu\u1eadt ghi l\u00e0: \u00e1nh s\u00e1ng tia laze c\u00f3 \u0111\u1ed9 h\u1ed9i t\u1ee5 cao \u0111\u01b0\u1ee3c chi\u1ebfu v\u00e0o m\u00e0ng m\u1ecfng c\u1ee7a \u0111\u0129a quang, tia laze s\u1ebd t\u00e1c d\u1ee5ng v\u1edbi v\u1eadt li\u1ec7u ghi c\u1ee7a \u0111\u0129a, g\u00e2y ra c\u00e1c bi\u1ebfn \u0111\u1ed5i v\u1eadt l\u00fd v\u00e0 ho\u00e1 h\u1ecdc, h\u00ecnh th\u00e0nh c\u00e1c \u0111i\u1ec3m ghi. \u0110i\u1ec1u n\u00e0y c\u0169ng gi\u1ed1ng nh\u01b0 ch\u00fang ta vi\u1ebft ch\u1eef v\u00e0 \u0111\u1ec3 l\u1ea1i n\u00e9t ch\u1eef tr\u00ean gi\u1ea5y. C\u00e1c \u0111i\u1ec3m ghi tr\u00ean m\u00e0ng m\u1ecfng tu\u1ef3 thu\u1ed9c n\u1ed9i dung th\u00f4ng tin m\u00e0 c\u00e1c \u0111i\u1ec3m ghi s\u1ebd c\u00f3 t\u00ednh ch\u1ea5t v\u00e0 \u0111\u01b0\u1eddng vi\u1ec1n kh\u00e1c nhau, nh\u1edd \u0111\u00f3 m\u00e0 th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef. Ng\u00e0y nay ng\u01b0\u1eddi ta \u0111\u00e3 ph\u00e1t minh \u0111\u01b0\u1ee3c nhi\u1ec1u lo\u1ea1i v\u1eadt li\u1ec7u ghi quang h\u1ecdc. Tu\u1ef3 theo t\u00e1c d\u1ee5ng c\u1ee7a tia laze l\u00ean v\u1eadt li\u1ec7u kh\u00e1c nhau, tia laze g\u00e2y c\u00e1c t\u00e1c d\u1ee5ng, g\u00e2y s\u1ef1 thay \u0111\u1ed5i v\u1ec1 v\u1eadt l\u00fd, ho\u00e1 h\u1ecdc kh\u00e1c nhau, ng\u01b0\u1eddi ta chia v\u1eadt li\u1ec7u ch\u1ebf t\u1ea1o \u0111\u0129a l\u00e0m m\u1ea5y lo\u1ea1i: “ch\u00e1y \u0103n m\u00f2n”, “bi\u1ebfn \u0111\u1ed5i m\u1ea1nh”, “\u0111\u1ed5i m\u00e0u h\u1eefu c\u01a1”, “b\u1eaft \u0111i\u1ec7n t\u1eed”. Lo\u1ea1i v\u1eadt li\u1ec7u n\u00e0y do s\u1ef1 \u0111\u1ed1t ch\u00e1y quang ho\u00e1 h\u1ecdc t\u1ea1o n\u00ean l\u1ed7 l\u00e0 thu\u1ed9c lo\u1ea1i v\u1eadt li\u1ec7u ch\u00e1y \u0103n m\u00f2n. Trong lo\u1ea1i v\u1eadt li\u1ec7u n\u00e0y c\u00f3 ch\u1ee9a tinh th\u1ec3 samari florua v\u00e0 bari clorua\u2026 Trong lo\u1ea1i v\u1eadt li\u1ec7u “bi\u1ebfn \u0111\u1ed5i m\u1ea1nh” c\u00f3 ch\u1ee9a telua oxit. D\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a tia laze, \u0111\u1ed9 trong su\u1ed1t c\u1ee7a v\u1eadt li\u1ec7u s\u1ebd thay \u0111\u1ed5i l\u00e0m thay \u0111\u1ed5i chi\u1ebft su\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u, nh\u1edd \u0111\u00f3 m\u00e0 ghi \u0111\u01b0\u1ee3c th\u00f4ng tin. Trong lo\u1ea1i v\u1eadt li\u1ec7u “\u0111\u1ed5i m\u00e0u h\u1eefu c\u01a1” c\u00f3 ch\u1ee9a d\u1eabn su\u1ea5t c\u1ee7a pyri\u0111in, 4 – xyanogen, 2 – metyl quinon\u2026 l\u00e0 nh\u1eefng ch\u1ea5t h\u1eefu c\u01a1. D\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a tia laze, c\u00e1c h\u1ee3p ch\u1ea5t n\u00e0y s\u1ebd thay \u0111\u1ed5i c\u1ea5u tr\u00fac, l\u00e0m thay \u0111\u1ed5i ph\u1ed5 h\u1ea5p th\u1ee5 c\u1ee7a h\u1ee3p ch\u1ea5t, nh\u1edd \u0111\u00f3 ng\u01b0\u1eddi ta s\u1ebd ghi \u0111\u01b0\u1ee3c th\u00f4ng tin.<\/p>\n\n\n\n
Tuy c\u00f3 nhi\u1ec1u lo\u1ea1i v\u1eadt li\u1ec7u \u0111\u1ec3 ch\u1ebf t\u1ea1o \u0111\u0129a quang VCD, nh\u01b0ng ch\u00fang \u0111\u1ec1u c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m chung l\u00e0 d\u01b0\u1edbi t\u00e1c d\u1ee5ng chi\u1ebfu x\u1ea1 c\u1ee7a tia laze, ch\u00fang s\u1ebd c\u00f3 nh\u1eefng bi\u1ebfn \u0111\u1ed5i v\u1eadt l\u00fd, ho\u00e1 h\u1ecdc \u0111\u1eb7c tr\u01b0ng nh\u1edd \u0111\u00f3 m\u00e0 c\u00e1c lo\u1ea1i \u0111\u0129a quang h\u1ecdc s\u1ebd ghi nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u th\u00f4ng tin.<\/p>\n\n\n\n
\u0110\u0129a quang VCD ch\u1ec9 c\u00f3 m\u00e0ng r\u1ea5t m\u1ecfng v\u1eadt li\u1ec7u ghi (ch\u1ec9 d\u00e0y 20-30 nanomet) c\u00f2n l\u1ea1i l\u00e0 ch\u1ea5t l\u00e0m \u0111\u1ebf \u0111\u1ec3 tr\u00e1ng v\u1eadt li\u1ec7u. Ch\u1ea5t l\u00e0m \u0111\u1ebf th\u01b0\u1eddng l\u00e0 v\u1eadt li\u1ec7u polyme polymetyl metacrilat, polycacbonat v\u00e0 v\u00e0i lo\u1ea1i polyme k\u1ebft tinh m\u1edbi \u0111\u01b0\u1ee3c ph\u00e1t minh. Khi ch\u1ebf t\u1ea1o \u0111\u0129a ghi quang h\u1ecdc \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u00edn hi\u1ec7u ghi tr\u00ean \u0111\u0129a, ng\u01b0\u1eddi ta ph\u1ea3i ti\u1ebfn h\u00e0nh nhi\u1ec1u c\u00f4ng \u0111o\u1ea1n: Tr\u01b0\u1edbc h\u1ebft ng\u01b0\u1eddi ta ph\u1ee7 l\u00ean \u0111\u1ebf m\u1ed9t l\u1edbp ch\u1ea5t c\u00e1ch \u0111i\u1ec7n th\u01b0\u1eddng l\u00e0 silic oxit ho\u1eb7c k\u1ebdm sunfua. Sau \u0111\u00f3 l\u1ea1i ph\u1ee7 ti\u1ebfp l\u1edbp v\u1eadt li\u1ec7u ghi r\u1ed3i l\u1ea1i m\u1ed9t l\u1edbp t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 trong su\u1ed1t \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 truy\u1ec1n quang cho tia laze \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Cu\u1ed1i c\u00f9ng \u0111\u1ec3 b\u1ea3o v\u1ec7 l\u1edbp ghi t\u00edn hi\u1ec7u tr\u00ean \u0111\u0129a quang ng\u01b0\u1eddi ta l\u1ea1i m\u1ea1 m\u1ed9t m\u00e0ng m\u1ecfng kim lo\u1ea1i ph\u1ea3n x\u1ea1 (v\u00ed d\u1ee5 m\u00e0ng nh\u00f4m kim lo\u1ea1i). Nh\u01b0 v\u1eady ch\u1ec9 v\u1edbi \u0111\u0129a quang VCD trong c\u00f4ng ngh\u1ec7 ch\u1ebf t\u1ea1o, ngo\u00e0i vi\u1ec7c ch\u1ecdn v\u1eadt li\u1ec7u, qu\u1ea3 c\u00f2n nhi\u1ec1u n\u1ed9i dung nghi\u00ean c\u1ee9u, nhi\u1ec1u tri th\u1ee9c c\u1ea7n bi\u1ebft.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: VCD; V\u1eadt li\u1ec7u ghi quang h\u1ecdc.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
\u0110\u0129a quang VCD gi\u00e1 r\u1ebb, \u0111\u1eb9p l\u00e0 m\u1ed9t trong nh\u1eefng lo\u1ea1i \u0111\u0129a s\u1ed1 ho\u00e1 d\u00f9ng tia laze \u0111\u01b0\u1ee3c m\u1ecdi ng\u01b0\u1eddi \u01b0a th\u00edch. V\u1edbi m\u1ed9t chi\u1ebfc \u0111\u0129a nh\u1ecf \u0111\u01b0\u1eddng k\u00ednh 12cm, d\u00e0y 1,2mm l\u00e0 lo\u1ea1i \u0111\u1ed3 v\u1eadt k\u1ef9 thu\u1eadt cao, h\u1ed9i \u0111\u1ee7 c\u00e1c y\u1ebfu t\u1ed1 k\u1ef9 thu\u1eadt cao nh\u01b0: K\u1ef9 thu\u1eadt tia laze, k\u1ef9 thu\u1eadt s\u1ed1 […]<\/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":[8,15],"tags":[],"class_list":["post-7902","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7902","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=7902"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7902\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7902"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7902"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7902"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}