{"id":680616,"date":"2024-10-28T07:59:37","date_gmt":"2024-10-28T06:59:37","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=680616"},"modified":"2024-10-28T07:59:37","modified_gmt":"2024-10-28T06:59:37","slug":"phan-tich-tia-laser-thoang-qua-lfa","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/phan-tich-tia-laser-thoang-qua-lfa\/","title":{"rendered":"Ph\u00e2n T\u00edch Tia Laser Tho\u00e1ng Qua (LFA)"},"content":{"rendered":"<p class=\"sidekick\">Ph\u00e2n T\u00edch Tia Laser Tho\u00e1ng Qua (LFA): k\u1ef9 thu\u1eadt \u0111o \u0111\u1eb7c t\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u nhanh ch\u00f3ng, ch\u00ednh x\u00e1c d\u00f9ng tia laser \u0111\u1ec3 ki\u1ec3m tra ph\u1ea3n h\u1ed3i nhi\u1ec7t.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/phan_tich_tia_laser_thoang_qua_lfa.png\" alt=\"Ph\u00e2n T\u00edch Tia Laser Tho\u00e1ng Qua (LFA)\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Ph\u00e2n T\u00edch Tia Laser Tho\u00e1ng Qua (LFA)<\/h2>\n<p>Ph\u00e2n t\u00edch tia laser tho\u00e1ng qua (Laser Flash Analysis &#8211; LFA) l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p quan tr\u1ecdng trong l\u0129nh v\u1ef1c <i>k\u1ef9 thu\u1eadt nhi\u1ec7t<\/i> d\u00f9ng \u0111\u1ec3 \u0111o c\u00e1c \u0111\u1eb7c t\u00ednh nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u, nh\u01b0 \u0111\u1ed9 d\u1eabn nhi\u1ec7t, nhi\u1ec7t dung v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng nhi\u1ec7t. LFA ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t tia laser ng\u1eafn \u0111\u1ec3 t\u1ea1o ra nhi\u1ec7t \u0111\u1ed9 t\u0103ng \u0111\u1ed9t ng\u1ed9t tr\u00ean b\u1ec1 m\u1eb7t m\u1eabu, sau \u0111\u00f3 \u0111o th\u1eddi gian v\u00e0 c\u00e1ch th\u1ee9c nhi\u1ec7t \u0111\u1ed9 lan truy\u1ec1n qua m\u1eabu.<\/p>\n<h2>Nguy\u00ean L\u00fd Ho\u1ea1t \u0110\u1ed9ng C\u1ee7a LFA<\/h2>\n<p>Ph\u01b0\u01a1ng ph\u00e1p LFA d\u1ef1a tr\u00ean nguy\u00ean l\u00fd truy\u1ec1n nhi\u1ec7t \u0111a t\u1ea7ng. Sau khi tia laser chi\u1ebfu v\u00e0o b\u1ec1 m\u1eb7t m\u1eabu, n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t t\u1eeb tia laser s\u1ebd ng\u1ea5m v\u00e0o trong m\u1eabu, t\u1ea1o ra s\u1ef1 thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9. S\u1ef1 thay \u0111\u1ed5i n\u00e0y s\u1ebd lan truy\u1ec1n t\u1eeb l\u1edbp b\u1ec1 m\u1eb7t v\u00e0o s\u00e2u trong v\u1eadt li\u1ec7u theo th\u1eddi gian.<\/p>\n<p>Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c di\u1ec5n ra theo c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<p><u1><\/p>\n<li><b>Chi\u1ebfu tia laser:<\/b> M\u1ed9t tia laser ng\u1eafn v\u00e0 m\u1ea1nh chi\u1ebfu l\u00ean b\u1ec1 m\u1eb7t m\u1eabu.<\/li>\n<li><b>\u0110o nhi\u1ec7t \u0111\u1ed9:<\/b> C\u00e1c c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 s\u1ebd ghi l\u1ea1i s\u1ef1 thay \u0111\u1ed5i c\u1ee7a nhi\u1ec7t \u0111\u1ed9 tr\u00ean b\u1ec1 m\u1eb7t v\u00e0 b\u00ean trong m\u1eabu.<\/li>\n<li><b>Ph\u00e2n t\u00edch d\u1eef li\u1ec7u:<\/b> S\u1ef1 lan truy\u1ec1n nhi\u1ec7t \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch \u0111\u1ec3 t\u00ednh to\u00e1n c\u00e1c \u0111\u1eb7c t\u00ednh nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u.<\/li>\n<p><\/u1><\/p>\n<h2>C\u00e1c Th\u00f4ng S\u1ed1 \u0110o L\u01b0\u1eddng Trong LFA<\/h2>\n<p>Ph\u01b0\u01a1ng ph\u00e1p LFA cho ph\u00e9p \u0111o c\u00e1c th\u00f4ng s\u1ed1 quan tr\u1ecdng c\u1ee7a v\u1eadt li\u1ec7u:<\/p>\n<p><o1><\/p>\n<li><b>\u0110\u1ed9 d\u1eabn nhi\u1ec7t (K):<\/b> \u0110\u00e2y l\u00e0 kh\u1ea3 n\u0103ng c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u d\u1eabn nhi\u1ec7t. \u0110\u01a1n v\u1ecb th\u01b0\u1eddng l\u00e0 W\/(m\u00b7K).<\/li>\n<li><b>Nhi\u1ec7t dung ri\u00eang (C<sub>p<\/sub>):<\/b> Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a m\u1ed9t \u0111\u01a1n v\u1ecb kh\u1ed1i l\u01b0\u1ee3ng m\u1eabu l\u00ean m\u1ed9t \u0111\u01a1n v\u1ecb nhi\u1ec7t \u0111\u1ed9. \u0110\u01a1n v\u1ecb th\u01b0\u1eddng l\u00e0 J\/(kg\u00b7K).<\/li>\n<li><b>Kh\u1ed1i l\u01b0\u1ee3ng nhi\u1ec7t (D):<\/b> \u0110\u00e2y l\u00e0 s\u1ea3n ph\u1ea9m c\u1ee7a nhi\u1ec7t dung ri\u00eang v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1eabu. \u0110\u01a1n v\u1ecb th\u01b0\u1eddng l\u00e0 J\/K.<\/li>\n<p><\/o1><\/p>\n<p>C\u00e1c ph\u01b0\u01a1ng tr\u00ecnh li\u00ean quan c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft nh\u01b0 sau:<\/p>\n<ul>\n<li>\u0110\u1ed9 d\u1eabn nhi\u1ec7t: \\( K = \\frac{{D}}{{A \\cdot \\Delta T}} \\)<\/li>\n<li>Nhi\u1ec7t dung ri\u00eang: \\( C_{p} = \\frac{{Q}}{{m \\cdot \\Delta T}} \\)<\/li>\n<\/ul>\n<h2>\u1ee8ng D\u1ee5ng C\u1ee7a LFA<\/h2>\n<p>LFA \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c l\u0129nh v\u1ef1c:<\/p>\n<p><u1><\/p>\n<li><b>Ch\u1ebf t\u1ea1o v\u1eadt li\u1ec7u:<\/b> \u0110o \u0111\u1ed9 d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t nhi\u1ec7t.<\/li>\n<li><b>\u0110i\u1ec7n t\u1eed:<\/b> \u0110\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng t\u1ea3n nhi\u1ec7t c\u1ee7a c\u00e1c b\u1ed9 vi x\u1eed l\u00fd v\u00e0 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed kh\u00e1c.<\/li>\n<li><b>Nghi\u00ean c\u1ee9u n\u0103ng l\u01b0\u1ee3ng:<\/b> X\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1eb7c t\u00ednh nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t v\u00e0 c\u00e1c ch\u1ea5t x\u00fac t\u00e1c.<\/li>\n<p><\/u1><\/p>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>Ph\u00e2n t\u00edch tia laser tho\u00e1ng qua (LFA) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt \u0111o l\u01b0\u1eddng hi\u1ec7u qu\u1ea3, cho ph\u00e9p ch\u00fang ta hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 c\u00e1c \u0111\u1eb7c t\u00ednh nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u. Nh\u1edd v\u00e0o s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c c\u00f4ng ngh\u1ec7 \u0111o l\u01b0\u1eddng, LFA \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng c\u1ee5 kh\u00f4ng th\u1ec3 thi\u1ebfu trong l\u0129nh v\u1ef1c nghi\u00ean c\u1ee9u v\u00e0 \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt nhi\u1ec7t.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ph\u00e2n T\u00edch Tia Laser Tho\u00e1ng Qua (LFA): k\u1ef9 thu\u1eadt \u0111o \u0111\u1eb7c t\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u nhanh ch\u00f3ng, ch\u00ednh x\u00e1c d\u00f9ng tia laser \u0111\u1ec3 ki\u1ec3m tra ph\u1ea3n h\u1ed3i nhi\u1ec7t.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ph\u00e2n T\u00edch Tia Laser Tho\u00e1ng 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