{"id":44948,"date":"2023-04-22T03:07:34","date_gmt":"2023-04-22T08:07:34","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-does-a-piezoelectric-transducer-work\/"},"modified":"2025-01-21T07:12:06","modified_gmt":"2025-01-21T12:12:06","slug":"how-does-a-piezoelectric-transducer-work","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-does-a-piezoelectric-transducer-work\/","title":{"rendered":"Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n"},"content":{"rendered":"<p>Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n l\u00e0 m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng v\u1eadt l\u00fd th\u00fa v\u1ecb, cho ph\u00e9p chuy\u1ec3n \u0111\u1ed5i gi\u1eefa n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc v\u00e0 n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n.  \u0110i\u1ec1u n\u00e0y m\u1edf ra c\u00e1nh c\u1eeda cho nhi\u1ec1u \u1ee9ng d\u1ee5ng \u0111a d\u1ea1ng, t\u1eeb b\u1eadt l\u1eeda gas \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf si\u00eau \u00e2m ph\u1ee9c t\u1ea1p. V\u1eady ch\u00ednh x\u00e1c th\u00ec b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o? B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i n\u00e0y, gi\u1ea3i th\u00edch c\u00e1ch ch\u00fang bi\u1ebfn \u00e1p l\u1ef1c v\u00e0 rung \u0111\u1ed9ng th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n<h3>Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp v\u00e0 ngh\u1ecbch \u0111\u1ea3o<\/h3>\n<p>B\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hai hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n ch\u00ednh: hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp v\u00e0 hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n ngh\u1ecbch \u0111\u1ea3o. Hi\u1ec7u \u1ee9ng tr\u1ef1c ti\u1ebfp x\u1ea3y ra khi m\u1ed9t v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n b\u1ecb bi\u1ebfn d\u1ea1ng c\u01a1 h\u1ecdc (n\u00e9n ho\u1eb7c k\u00e9o gi\u00e3n), t\u1ea1o ra \u0111i\u1ec7n \u00e1p tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a n\u00f3. Ng\u01b0\u1ee3c l\u1ea1i, hi\u1ec7u \u1ee9ng ngh\u1ecbch \u0111\u1ea3o x\u1ea3y ra khi m\u1ed9t \u0111i\u1ec7n tr\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00ean v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, khi\u1ebfn n\u00f3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc ho\u1eb7c h\u00ecnh d\u1ea1ng.<\/p>\n<h3>V\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n<\/h3>\n<p>V\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n \u0111\u00f3ng vai tr\u00f2 trung t\u00e2m trong ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i.  M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n ph\u1ed5 bi\u1ebfn bao g\u1ed3m th\u1ea1ch anh, g\u1ed1m \u00e1p \u0111i\u1ec7n (nh\u01b0 PZT &#8211; ch\u00ec zirconate titanate) v\u00e0 polyme \u00e1p \u0111i\u1ec7n (nh\u01b0 PVDF &#8211; polyvinylidene fluoride).  M\u1ed7i lo\u1ea1i v\u1eadt li\u1ec7u c\u00f3 nh\u1eefng \u0111\u1eb7c t\u00ednh ri\u00eang bi\u1ec7t, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>V\u1eadt li\u1ec7u<\/th>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Th\u1ea1ch anh<\/td>\n<td>\u0110\u1ed9 \u1ed5n \u0111\u1ecbnh cao, t\u1ea7n s\u1ed1 c\u1ed9ng h\u01b0\u1edfng ch\u00ednh x\u00e1c<\/td>\n<td>Hi\u1ec7u su\u1ea5t \u00e1p \u0111i\u1ec7n th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td>G\u1ed1m \u00e1p \u0111i\u1ec7n (PZT)<\/td>\n<td>Hi\u1ec7u su\u1ea5t \u00e1p \u0111i\u1ec7n cao, gi\u00e1 th\u00e0nh h\u1ee3p l\u00fd<\/td>\n<td>\u0110\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t k\u00e9m h\u01a1n th\u1ea1ch anh<\/td>\n<\/tr>\n<tr>\n<td>Polyme \u00e1p \u0111i\u1ec7n (PVDF)<\/td>\n<td>Linh ho\u1ea1t, d\u1ebbo dai, d\u1ec5 ch\u1ebf t\u1ea1o<\/td>\n<td>Hi\u1ec7u su\u1ea5t \u00e1p \u0111i\u1ec7n th\u1ea5p h\u01a1n g\u1ed1m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>C\u1ea5u t\u1ea1o c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n<\/h3>\n<p>C\u1ea5u t\u1ea1o c\u01a1 b\u1ea3n c\u1ee7a m\u1ed9t b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n th\u01b0\u1eddng bao g\u1ed3m m\u1ed9t ho\u1eb7c nhi\u1ec1u l\u1edbp v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n \u0111\u01b0\u1ee3c k\u1eb9p gi\u1eefa hai \u0111i\u1ec7n c\u1ef1c. Khi m\u1ed9t l\u1ef1c t\u00e1c \u0111\u1ed9ng l\u00ean b\u1ed9 chuy\u1ec3n \u0111\u1ed5i, v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n b\u1ecb bi\u1ebfn d\u1ea1ng, t\u1ea1o ra \u0111i\u1ec7n \u00e1p gi\u1eefa hai \u0111i\u1ec7n c\u1ef1c.  Ng\u01b0\u1ee3c l\u1ea1i, khi m\u1ed9t \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o hai \u0111i\u1ec7n c\u1ef1c, v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n s\u1ebd thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc, t\u1ea1o ra l\u1ef1c ho\u1eb7c rung \u0111\u1ed9ng.<\/p>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n<\/h3>\n<p>B\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau. Trong l\u0129nh v\u1ef1c y t\u1ebf, ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb si\u00eau \u00e2m \u0111\u1ec3 t\u1ea1o h\u00ecnh \u1ea3nh b\u00ean trong c\u01a1 th\u1ec3. Trong c\u00f4ng nghi\u1ec7p, ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o \u00e1p su\u1ea5t, gia t\u1ed1c v\u00e0 rung \u0111\u1ed9ng.  V\u00ed d\u1ee5, trong l\u0129nh v\u1ef1c si\u00eau \u00e2m, m\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb c\u1ee7a Beijing Ultrasonic s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 \u00e1p \u0111i\u1ec7n \u0111\u1ec3 t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m.  Ch\u00fang c\u0169ng \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed ti\u00eau d\u00f9ng nh\u01b0 loa, microphone v\u00e0 b\u1eadt l\u1eeda.<\/p>\n<p>T\u00f3m l\u1ea1i, b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb linh ho\u1ea1t v\u00e0 h\u1eefu \u00edch, d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng gi\u1eefa d\u1ea1ng c\u01a1 h\u1ecdc v\u00e0 \u0111i\u1ec7n. S\u1ef1 \u0111a d\u1ea1ng v\u1ec1 v\u1eadt li\u1ec7u v\u00e0 c\u1ea5u t\u1ea1o cho ph\u00e9p b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u00e1p \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb y t\u1ebf v\u00e0 c\u00f4ng nghi\u1ec7p \u0111\u1ebfn \u0111i\u1ec7n t\u1eed ti\u00eau d\u00f9ng, \u0111\u00f3ng g\u00f3p \u0111\u00e1ng k\u1ec3 v\u00e0o s\u1ef1 ti\u1ebfn b\u1ed9 c\u00f4ng ngh\u1ec7 hi\u1ec7n \u0111\u1ea1i.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n l\u00e0 m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng v\u1eadt l\u00fd th\u00fa v\u1ecb, cho ph\u00e9p chuy\u1ec3n \u0111\u1ed5i gi\u1eefa n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc v\u00e0 n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n. \u0110i\u1ec1u n\u00e0y m\u1edf ra c\u00e1nh c\u1eeda cho nhi\u1ec1u \u1ee9ng d\u1ee5ng \u0111a d\u1ea1ng, t\u1eeb b\u1eadt l\u1eeda gas \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf si\u00eau \u00e2m ph\u1ee9c t\u1ea1p. V\u1eady ch\u00ednh x\u00e1c th\u00ec<\/p>\n","protected":false},"author":1,"featured_media":19409,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-44948","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\/44948","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=44948"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/44948\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/19409"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=44948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=44948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=44948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}