{"id":60415,"date":"2023-04-21T22:08:10","date_gmt":"2023-04-22T03:08:10","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-detect-infrasound\/"},"modified":"2025-01-27T06:08:10","modified_gmt":"2025-01-27T11:08:10","slug":"how-to-detect-infrasound","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-to-detect-infrasound\/","title":{"rendered":"Detekce infrazvuku: metody a praktick\u00e9 postupy"},"content":{"rendered":"

Infrazvuk, zvuk s frekvenc\u00ed ni\u017e\u0161\u00ed ne\u017e 20 Hz, je pro lidsk\u00e9 ucho nesly\u0161iteln\u00fd, ale jeho detekce je d\u016fle\u017eit\u00e1 v mnoha oblastech, od monitorov\u00e1n\u00ed sope\u010dn\u00fdch erupc\u00ed po sledov\u00e1n\u00ed pr\u016fmyslov\u00fdch proces\u016f. Jeho detekce vy\u017eaduje specializovan\u00e9 vybaven\u00ed a znalosti. Tento \u010dl\u00e1nek se zam\u011b\u0159\u00ed na metody detekce infrazvuku.<\/p>\n

Metody detekce infrazvuku<\/h3>\n

Detekce infrazvuku se li\u0161\u00ed od detekce sly\u0161iteln\u00e9ho zvuku kv\u016fli jeho n\u00edzk\u00e9 frekvenci a n\u00edzk\u00e9 energii. Klasick\u00e9 mikrofony nejsou pro detekci infrazvuku vhodn\u00e9 kv\u016fli jejich omezen\u00e9 frekven\u010dn\u00ed odezv\u011b. Nejpou\u017e\u00edvan\u011bj\u0161\u00ed metodou je pou\u017eit\u00ed infrazvukov\u00fdch mikrofon\u016f (infrasonick\u00fdch senzor\u016f), kter\u00e9 jsou konstruov\u00e1ny pro citliv\u00e9 m\u011b\u0159en\u00ed tlaku vzduchu v infrazvukov\u00e9m p\u00e1smu. Tyto mikrofony disponuj\u00ed speci\u00e1ln\u00edmi membr\u00e1nami a zesilova\u010di, kter\u00e9 minimalizuj\u00ed \u0161um a maximalizuj\u00ed citlivost na n\u00edzkofrekven\u010dn\u00ed vibrace.<\/p>\n

Typy infrazvukov\u00fdch mikrofon\u016f<\/h3>\n

Existuj\u00ed r\u016fzn\u00e9 typy infrazvukov\u00fdch mikrofon\u016f, li\u0161\u00edc\u00ed se citlivost\u00ed, frekven\u010dn\u00edm rozsahem a cenou. N\u011bkter\u00e9 jsou citliv\u011bj\u0161\u00ed na specifick\u00e9 frekven\u010dn\u00ed p\u00e1sma, zat\u00edmco jin\u00e9 poskytuj\u00ed \u0161irokop\u00e1smovou detekci. Kvalita mikrofonu ovliv\u0148uje p\u0159esnost m\u011b\u0159en\u00ed a schopnost odli\u0161it skute\u010dn\u00fd infrazvuk od \u0161umu. D\u016fle\u017eit\u00fdm parametrem je tak\u00e9 citlivost vyj\u00e1d\u0159en\u00e1 v dB\/Pa.<\/p>\n\n\n\n\n\n\n\n
Typ mikrofonu<\/th>\nFrekven\u010dn\u00ed rozsah (Hz)<\/th>\nCitlivost (dB\/Pa)<\/th>\nCena (orienta\u010dn\u00ed)<\/th>\n<\/tr>\n<\/thead>\n
Piezoelektrick\u00fd<\/td>\n0.1 – 100<\/td>\n-100 a\u017e -130<\/td>\nSt\u0159edn\u00ed<\/td>\n<\/tr>\n
Kondenz\u00e1torov\u00fd<\/td>\n1 – 200<\/td>\n-110 a\u017e -140<\/td>\nVysok\u00e1<\/td>\n<\/tr>\n
MEMS<\/td>\n0.1 – 50<\/td>\n-90 a\u017e -120<\/td>\nN\u00edzk\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Um\u00edst\u011bn\u00ed a kalibrace senzor\u016f<\/h3>\n

Spr\u00e1vn\u00e9 um\u00edst\u011bn\u00ed infrazvukov\u00e9ho mikrofonu je kl\u00ed\u010dov\u00e9 pro minimalizaci ru\u0161en\u00ed a maximalizaci kvality sign\u00e1lu. Je nutn\u00e9 minimalizovat vliv v\u011btru, vibrac\u00ed a dal\u0161\u00edch zdroj\u016f \u0161umu. Ide\u00e1ln\u00ed je um\u00edst\u011bn\u00ed na stabiln\u00edm podkladu, daleko od zdroj\u016f vibrac\u00ed a v chr\u00e1n\u011bn\u00e9m prost\u0159ed\u00ed. Pravideln\u00e1 kalibrace senzor\u016f je nezbytn\u00e1 pro zaji\u0161t\u011bn\u00ed p\u0159esn\u00fdch m\u011b\u0159en\u00ed. Kalibra\u010dn\u00ed zdroje mohou zahrnovat kalibra\u010dn\u00ed p\u00edstov\u00e9 fonometry nebo jin\u00e9 kalibra\u010dn\u00ed za\u0159\u00edzen\u00ed pro infrazvukov\u00e9 frekvence.<\/p>\n

Zpracov\u00e1n\u00ed sign\u00e1lu a anal\u00fdza dat<\/h3>\n

Sign\u00e1l z infrazvukov\u00e9ho mikrofonu je obvykle velmi slab\u00fd a obsahuje \u0161um. Pro jeho zpracov\u00e1n\u00ed se pou\u017e\u00edvaj\u00ed speci\u00e1ln\u00ed techniky, jako je filtrov\u00e1n\u00ed, zesilov\u00e1n\u00ed a digit\u00e1ln\u00ed zpracov\u00e1n\u00ed sign\u00e1lu. Anal\u00fdza dat m\u016f\u017ee zahrnovat Fourierovu transformaci pro ur\u010den\u00ed frekven\u010dn\u00edho spektra sign\u00e1lu a identifikaci zdroj\u016f infrazvuku. Software pro anal\u00fdzu infrazvuku umo\u017e\u0148uje vizualizaci dat, identifikaci dominantn\u00edch frekvenc\u00ed a kvantifikaci intenzity infrazvuku.<\/p>\n

Aplikace detekce infrazvuku<\/h3>\n

Detekce infrazvuku nach\u00e1z\u00ed uplatn\u011bn\u00ed v r\u016fzn\u00fdch oblastech. Pou\u017e\u00edv\u00e1 se pro monitorov\u00e1n\u00ed sope\u010dn\u00fdch erupc\u00ed, detekci zem\u011bt\u0159esen\u00ed, sledov\u00e1n\u00ed pr\u016fmyslov\u00fdch proces\u016f, anal\u00fdzu meteorologick\u00fdch jev\u016f a v\u00fdzkum v oblasti akustiky. V n\u011bkter\u00fdch p\u0159\u00edpadech se infrazvukov\u00e9 senzory pou\u017e\u00edvaj\u00ed i pro sledov\u00e1n\u00ed zv\u00ed\u0159at, jeliko\u017e n\u011bkte\u0159\u00ed savci a pt\u00e1ci infrazvuk vn\u00edmaj\u00ed.<\/p>\n

Infrazvuk, a\u010dkoliv nesly\u0161iteln\u00fd, je d\u016fle\u017eit\u00fdm aspektem na\u0161eho prost\u0159ed\u00ed a jeho detekce a anal\u00fdza poskytuje cenn\u00e9 informace v mnoha v\u011bdeck\u00fdch a technologick\u00fdch oblastech. Spr\u00e1vn\u00e9 porozum\u011bn\u00ed metod\u00e1m detekce infrazvuku a jejich aplikac\u00edm je proto kl\u00ed\u010dov\u00e9 pro dal\u0161\u00ed rozvoj v t\u011bchto oblastech.<\/p>\n","protected":false},"excerpt":{"rendered":"

Infrazvuk, zvuk s frekvenc\u00ed ni\u017e\u0161\u00ed ne\u017e 20 Hz, je pro lidsk\u00e9 ucho nesly\u0161iteln\u00fd, ale jeho detekce je d\u016fle\u017eit\u00e1 v mnoha oblastech, od monitorov\u00e1n\u00ed sope\u010dn\u00fdch erupc\u00ed po sledov\u00e1n\u00ed pr\u016fmyslov\u00fdch proces\u016f. Jeho detekce vy\u017eaduje specializovan\u00e9 vybaven\u00ed a znalosti. Tento \u010dl\u00e1nek se zam\u011b\u0159\u00ed na metody detekce infrazvuku. Metody detekce infrazvuku Detekce infrazvuku se li\u0161\u00ed od detekce sly\u0161iteln\u00e9ho zvuku<\/p>\n","protected":false},"author":1,"featured_media":26461,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-60415","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\/60415","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=60415"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60415\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/26461"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=60415"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=60415"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=60415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}