{"id":60991,"date":"2023-04-21T14:49:24","date_gmt":"2023-04-21T19:49:24","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-does-ultrasonic-sensor-work\/"},"modified":"2025-01-27T06:06:28","modified_gmt":"2025-01-27T11:06:28","slug":"how-does-ultrasonic-sensor-work","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-does-ultrasonic-sensor-work\/","title":{"rendered":"Ultrazvukov\u00e9 senzory: princip fungov\u00e1n\u00ed a pou\u017eit\u00ed"},"content":{"rendered":"

Ultrazvukov\u00e9 senzory se staly ned\u00edlnou sou\u010d\u00e1st\u00ed mnoha modern\u00edch aplikac\u00ed, od parkovac\u00edch senzor\u016f v automobilech a\u017e po automatizaci v pr\u016fmyslu. Jejich princip fungov\u00e1n\u00ed je zalo\u017een na vyu\u017eit\u00ed ultrazvuku, tedy zvukov\u00fdch vln s frekvenc\u00ed vy\u0161\u0161\u00ed ne\u017e 20 kHz, kter\u00e9 lidsk\u00e9 ucho nedok\u00e1\u017ee vn\u00edmat. Tento \u010dl\u00e1nek podrobn\u011b vysv\u011btl\u00ed, jak tyto senzory funguj\u00ed.<\/p>\n

Princip m\u011b\u0159en\u00ed vzd\u00e1lenosti<\/h3>\n

Ultrazvukov\u00fd senzor funguje na principu m\u011b\u0159en\u00ed doby letu ultrazvukov\u00e9ho impulzu. Senzor nejprve vys\u00edl\u00e1 kr\u00e1tk\u00fd impuls ultrazvuku. Tento impuls se \u0161\u00ed\u0159\u00ed prostorem a po dopadu na p\u0159ek\u00e1\u017eku se od n\u00ed odr\u00e1\u017e\u00ed zp\u011bt k senzoru. Senzor pot\u00e9 detekuje odra\u017een\u00fd impuls a m\u011b\u0159\u00ed \u010dasov\u00fd interval mezi vysl\u00e1n\u00edm a p\u0159\u00edjmem sign\u00e1lu. Vzd\u00e1lenost k p\u0159ek\u00e1\u017ece se n\u00e1sledn\u011b vypo\u010d\u00edt\u00e1 pomoc\u00ed zn\u00e1m\u00e9 rychlosti \u0161\u00ed\u0159en\u00ed zvuku ve vzduchu (p\u0159ibli\u017en\u011b 343 m\/s p\u0159i 20 \u00b0C). Vzorec pro v\u00fdpo\u010det vzd\u00e1lenosti je jednoduch\u00fd: Vzd\u00e1lenost = (Rychlost zvuku \u00d7 \u010cas letu) \/ 2. D\u011bl\u011bn\u00ed dv\u011bma je nezbytn\u00e9, proto\u017ee zvuk mus\u00ed urazit stejnou vzd\u00e1lenost tam i zp\u011bt.<\/p>\n

Typy ultrazvukov\u00fdch senzor\u016f<\/h3>\n

Existuj\u00ed r\u016fzn\u00e9 typy ultrazvukov\u00fdch senzor\u016f, kter\u00e9 se li\u0161\u00ed v konstrukci, dosahu a p\u0159esnosti. Z\u00e1kladn\u00ed rozd\u011blen\u00ed je na senzory s jedn\u00edm a se dv\u011bma piezoelektrick\u00fdmi m\u011bni\u010di. Senzory s jedn\u00edm m\u011bni\u010dem funguj\u00ed jako vys\u00edla\u010d i p\u0159ij\u00edma\u010d, zat\u00edmco senzory se dv\u011bma m\u011bni\u010di maj\u00ed odd\u011blen\u00fd vys\u00edla\u010d a p\u0159ij\u00edma\u010d, co\u017e obvykle vede k vy\u0161\u0161\u00ed p\u0159esnosti a spolehlivosti. Dal\u0161\u00ed rozd\u00edly spo\u010d\u00edvaj\u00ed v pou\u017eit\u00e9 frekvenci ultrazvuku, tvaru vyza\u0159ovac\u00edho diagramu a zp\u016fsobu zpracov\u00e1n\u00ed sign\u00e1lu.<\/p>\n\n\n\n\n\n\n
Typ senzoru<\/th>\nV\u00fdhody<\/th>\nNev\u00fdhody<\/th>\n<\/tr>\n<\/thead>\n
Jednom\u011bni\u010dov\u00fd<\/td>\nJednoduch\u00e1 konstrukce, ni\u017e\u0161\u00ed cena<\/td>\nNi\u017e\u0161\u00ed p\u0159esnost, citlivost na ru\u0161en\u00ed<\/td>\n<\/tr>\n
Dvoum\u011bni\u010dov\u00fd<\/td>\nVy\u0161\u0161\u00ed p\u0159esnost, men\u0161\u00ed citlivost na ru\u0161en\u00ed<\/td>\nSlo\u017eit\u011bj\u0161\u00ed konstrukce, vy\u0161\u0161\u00ed cena<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Vliv prost\u0159ed\u00ed na m\u011b\u0159en\u00ed<\/h3>\n

P\u0159esnost m\u011b\u0159en\u00ed ultrazvukov\u00e9ho senzoru m\u016f\u017ee b\u00fdt ovlivn\u011bna \u0159adou faktor\u016f prost\u0159ed\u00ed. Teplota vzduchu v\u00fdznamn\u011b ovliv\u0148uje rychlost \u0161\u00ed\u0159en\u00ed zvuku, co\u017e se mus\u00ed br\u00e1t v \u00favahu p\u0159i v\u00fdpo\u010dtu vzd\u00e1lenosti. Vlhkost vzduchu tak\u00e9 m\u016f\u017ee m\u00edt men\u0161\u00ed vliv na rychlost \u0161\u00ed\u0159en\u00ed zvuku. Dal\u0161\u00ed faktory, kter\u00e9 mohou ovlivnit m\u011b\u0159en\u00ed, zahrnuj\u00ed v\u00edtr, p\u0159\u00edtomnost p\u0159ek\u00e1\u017eek v okol\u00ed a odrazy zvuku od jin\u00fdch povrch\u016f. Kvalitn\u00ed senzory obsahuj\u00ed kompenza\u010dn\u00ed algoritmy pro vliv teploty.<\/p>\n

Aplikace ultrazvukov\u00fdch senzor\u016f<\/h3>\n

Ultrazvukov\u00e9 senzory nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha oblastech. Mezi nej\u010dast\u011bj\u0161\u00ed pat\u0159\u00ed:<\/p>\n

    \n
  • Automatizace:<\/strong> detekce objekt\u016f na mont\u00e1\u017en\u00edch link\u00e1ch, \u0159\u00edzen\u00ed robot\u016f, automatick\u00e9 parkov\u00e1n\u00ed.<\/li>\n
  • M\u011b\u0159en\u00ed vzd\u00e1lenosti:<\/strong> nap\u0159. v automobilov\u00e9m pr\u016fmyslu (parkovac\u00ed senzory), stavebnictv\u00ed (m\u011b\u0159en\u00ed vzd\u00e1lenost\u00ed).<\/li>\n
  • Bezpe\u010dnost:<\/strong> detekce p\u0159ek\u00e1\u017eek, ochrana osob p\u0159ed nebezpe\u010d\u00edmi.<\/li>\n
  • Medic\u00edna:<\/strong> ultrazvukov\u00e9 zobrazov\u00e1n\u00ed.<\/li>\n<\/ul>\n

    Zpracov\u00e1n\u00ed sign\u00e1lu a interpretace dat<\/h3>\n

    Sign\u00e1l p\u0159ijat\u00fd senzorem je zpracov\u00e1n elektronick\u00fdm obvodem, kter\u00fd vypo\u010d\u00edt\u00e1 \u010das letu a n\u00e1sledn\u011b vzd\u00e1lenost k p\u0159ek\u00e1\u017ece. Tento v\u00fdpo\u010det m\u016f\u017ee zahrnovat filtraci \u0161umu, kompenzaci vlivu prost\u0159ed\u00ed a dal\u0161\u00ed algoritmy pro zlep\u0161en\u00ed p\u0159esnosti m\u011b\u0159en\u00ed. V\u00fdsledn\u00e1 data jsou pot\u00e9 poskytnuta u\u017eivateli, nap\u0159\u00edklad zobrazena na displeji nebo pou\u017eita pro \u0159\u00edzen\u00ed n\u011bjak\u00e9ho procesu.<\/p>\n

    Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee ultrazvukov\u00e9 senzory p\u0159edstavuj\u00ed robustn\u00ed a spolehlivou technologii pro m\u011b\u0159en\u00ed vzd\u00e1lenosti, kter\u00e1 nach\u00e1z\u00ed uplatn\u011bn\u00ed v \u0161irok\u00e9m spektru aplikac\u00ed. Pochopen\u00ed jejich principu fungov\u00e1n\u00ed a limit\u016f je kl\u00ed\u010dov\u00e9 pro jejich efektivn\u00ed pou\u017eit\u00ed.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Ultrazvukov\u00e9 senzory se staly ned\u00edlnou sou\u010d\u00e1st\u00ed mnoha modern\u00edch aplikac\u00ed, od parkovac\u00edch senzor\u016f v automobilech a\u017e po automatizaci v pr\u016fmyslu. Jejich princip fungov\u00e1n\u00ed je zalo\u017een na vyu\u017eit\u00ed ultrazvuku, tedy zvukov\u00fdch vln s frekvenc\u00ed vy\u0161\u0161\u00ed ne\u017e 20 kHz, kter\u00e9 lidsk\u00e9 ucho nedok\u00e1\u017ee vn\u00edmat. Tento \u010dl\u00e1nek podrobn\u011b vysv\u011btl\u00ed, jak tyto senzory funguj\u00ed. Princip m\u011b\u0159en\u00ed vzd\u00e1lenosti Ultrazvukov\u00fd senzor funguje<\/p>\n","protected":false},"author":1,"featured_media":26464,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-60991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/comments?post=60991"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60991\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/26464"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=60991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=60991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=60991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}