{"id":47572,"date":"2023-04-22T00:10:56","date_gmt":"2023-04-22T05:10:56","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-make-ultrasonic-sound-generator\/"},"modified":"2025-01-21T07:20:34","modified_gmt":"2025-01-21T12:20:34","slug":"how-to-make-ultrasonic-sound-generator","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-make-ultrasonic-sound-generator\/","title":{"rendered":"T\u1ef1 ch\u1ebf m\u00e1y ph\u00e1t si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n t\u1ea1i nh\u00e0"},"content":{"rendered":"

\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, c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u00fa v\u1ecb v\u00e0 h\u1eefu \u00edch trong cu\u1ed9c s\u1ed1ng, t\u1eeb y t\u1ebf, c\u00f4ng nghi\u1ec7p cho \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed gia d\u1ee5ng. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t \u00e2m thanh si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n.<\/p>\n

Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00e1y ph\u00e1t si\u00eau \u00e2m<\/h3>\n

M\u00e1y ph\u00e1t si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n. M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u, v\u00ed d\u1ee5 nh\u01b0 th\u1ea1ch anh, g\u1ed1m \u00e1p \u0111i\u1ec7n (PZT), c\u00f3 kh\u1ea3 n\u0103ng thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng khi \u0111\u1eb7t d\u01b0\u1edbi \u0111i\u1ec7n \u00e1p. Khi \u00e1p m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u v\u00e0o v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, n\u00f3 s\u1ebd dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u1ee9ng. N\u1ebfu t\u1ea7n s\u1ed1 n\u00e0y n\u1eb1m trong d\u1ea3i si\u00eau \u00e2m (th\u01b0\u1eddng tr\u00ean 20kHz), v\u1eadt li\u1ec7u s\u1ebd ph\u00e1t ra s\u00f3ng si\u00eau \u00e2m.<\/p>\n

Linh ki\u1ec7n c\u1ea7n thi\u1ebft<\/h3>\n

\u0110\u1ec3 ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n, b\u1ea1n c\u1ea7n chu\u1ea9n b\u1ecb c\u00e1c linh ki\u1ec7n sau:<\/p>\n\n\n\n\n\n\n\n\n\n
Linh ki\u1ec7n<\/th>\nM\u00f4 t\u1ea3<\/th>\nS\u1ed1 l\u01b0\u1ee3ng<\/th>\n<\/tr>\n<\/thead>\n
B\u1ed9 dao \u0111\u1ed9ng (oscillator)<\/td>\nT\u1ea1o t\u00edn hi\u1ec7u \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u v\u1edbi t\u1ea7n s\u1ed1 si\u00eau \u00e2m<\/td>\n1<\/td>\n<\/tr>\n
B\u1ed9 khu\u1ebfch \u0111\u1ea1i (amplifier)<\/td>\nKhu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u t\u1eeb b\u1ed9 dao \u0111\u1ed9ng<\/td>\n1<\/td>\n<\/tr>\n
Loa si\u00eau \u00e2m (transducer)<\/td>\nChuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u0111i\u1ec7n th\u00e0nh s\u00f3ng si\u00eau \u00e2m<\/td>\n1<\/td>\n<\/tr>\n
Ngu\u1ed3n \u0111i\u1ec7n<\/td>\nCung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho m\u1ea1ch<\/td>\n1<\/td>\n<\/tr>\n
D\u00e2y n\u1ed1i, b\u1ea3ng m\u1ea1ch<\/td>\nK\u1ebft n\u1ed1i c\u00e1c linh ki\u1ec7n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n<\/h3>\n
    \n
  1. Thi\u1ebft k\u1ebf m\u1ea1ch:<\/strong> M\u1ea1ch \u0111i\u1ec7n c\u01a1 b\u1ea3n bao g\u1ed3m b\u1ed9 dao \u0111\u1ed9ng, b\u1ed9 khu\u1ebfch \u0111\u1ea1i v\u00e0 loa si\u00eau \u00e2m \u0111\u01b0\u1ee3c n\u1ed1i ti\u1ebfp. B\u1ed9 dao \u0111\u1ed9ng t\u1ea1o ra t\u00edn hi\u1ec7u, b\u1ed9 khu\u1ebfch \u0111\u1ea1i t\u0103ng c\u01b0\u1eddng t\u00edn hi\u1ec7u v\u00e0 loa si\u00eau \u00e2m chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u th\u00e0nh s\u00f3ng \u00e2m.<\/li>\n
  2. L\u1ef1a ch\u1ecdn t\u1ea7n s\u1ed1:<\/strong> T\u1ea7n s\u1ed1 si\u00eau \u00e2m c\u1ea7n \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p v\u1edbi \u1ee9ng d\u1ee5ng. V\u00ed d\u1ee5, t\u1ea7n s\u1ed1 40kHz th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb l\u00e0m s\u1ea1ch b\u1eb1ng si\u00eau \u00e2m.<\/li>\n
  3. L\u1eafp r\u00e1p m\u1ea1ch:<\/strong> K\u1ebft n\u1ed1i c\u00e1c linh ki\u1ec7n theo s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111\u00e3 thi\u1ebft k\u1ebf. C\u1ea7n \u0111\u1ea3m b\u1ea3o c\u00e1c k\u1ebft n\u1ed1i ch\u1eafc ch\u1eafn v\u00e0 \u0111\u00fang v\u1ecb tr\u00ed.<\/li>\n
  4. Ki\u1ec3m tra v\u00e0 hi\u1ec7u ch\u1ec9nh:<\/strong> Sau khi l\u1eafp r\u00e1p, k\u1ebft n\u1ed1i ngu\u1ed3n \u0111i\u1ec7n v\u00e0 ki\u1ec3m tra ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u1ea1ch. C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t microphone si\u00eau \u00e2m ho\u1eb7c oscilloscope \u0111\u1ec3 \u0111o t\u1ea7n s\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 s\u00f3ng si\u00eau \u00e2m. N\u1ebfu c\u1ea7n thi\u1ebft, hi\u1ec7u ch\u1ec9nh l\u1ea1i t\u1ea7n s\u1ed1 b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i gi\u00e1 tr\u1ecb c\u00e1c linh ki\u1ec7n trong b\u1ed9 dao \u0111\u1ed9ng.<\/li>\n<\/ol>\n

    L\u01b0u \u00fd khi ch\u1ebf t\u1ea1o<\/h3>\n
      \n
    • An to\u00e0n:<\/strong> S\u00f3ng si\u00eau \u00e2m c\u00f3 th\u1ec3 g\u00e2y h\u1ea1i cho s\u1ee9c kh\u1ecfe n\u1ebfu ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 cao trong th\u1eddi gian d\u00e0i. N\u00ean h\u1ea1n ch\u1ebf ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi loa si\u00eau \u00e2m khi \u0111ang ho\u1ea1t \u0111\u1ed9ng.<\/li>\n
    • L\u1ef1a ch\u1ecdn linh ki\u1ec7n:<\/strong> Ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a linh ki\u1ec7n \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a m\u00e1y ph\u00e1t si\u00eau \u00e2m. N\u00ean l\u1ef1a ch\u1ecdn linh ki\u1ec7n t\u1eeb c\u00e1c nh\u00e0 cung c\u1ea5p uy t\u00edn.<\/li>\n
    • Thi\u1ebft k\u1ebf m\u1ea1ch:<\/strong> Thi\u1ebft k\u1ebf m\u1ea1ch c\u1ea7n \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t t\u1ed1t nh\u1ea5t. <\/li>\n<\/ul>\n

      Vi\u1ec7c ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p n\u1ebfu b\u1ea1n c\u00f3 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 \u0111i\u1ec7n t\u1eed. Tuy nhi\u00ean, c\u1ea7n tu\u00e2n th\u1ee7 c\u00e1c l\u01b0u \u00fd v\u1ec1 an to\u00e0n v\u00e0 l\u1ef1a ch\u1ecdn linh ki\u1ec7n ph\u00f9 h\u1ee3p \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n khi s\u1eed d\u1ee5ng. Hy v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y \u0111\u00e3 cung c\u1ea5p cho b\u1ea1n nh\u1eefng th\u00f4ng tin h\u1eefu \u00edch \u0111\u1ec3 b\u1eaft \u0111\u1ea7u h\u00e0nh tr\u00ecnh kh\u00e1m ph\u00e1 th\u1ebf gi\u1edbi \u00e2m thanh si\u00eau \u00e2m.<\/p>\n","protected":false},"excerpt":{"rendered":"

      \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, c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u00fa v\u1ecb v\u00e0 h\u1eefu \u00edch trong cu\u1ed9c s\u1ed1ng, t\u1eeb y t\u1ebf, c\u00f4ng nghi\u1ec7p cho \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed gia d\u1ee5ng. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t \u00e2m<\/p>\n","protected":false},"author":1,"featured_media":19247,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-47572","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\/47572","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=47572"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/47572\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/19247"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=47572"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=47572"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=47572"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}