{"id":62846,"date":"2022-09-22T08:04:46","date_gmt":"2022-09-22T13:04:46","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/are-the-voltage-outputs-from-piezo-strain-gage-repeatable\/"},"modified":"2025-01-27T06:01:41","modified_gmt":"2025-01-27T11:01:41","slug":"are-the-voltage-outputs-from-piezo-strain-gage-repeatable","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/are-the-voltage-outputs-from-piezo-strain-gage-repeatable\/","title":{"rendered":"Opakovatelnost v\u00fdstupn\u00edho nap\u011bt\u00ed piezo sn\u00edma\u010d\u016f"},"content":{"rendered":"<p>Piezok\u0159emenn\u00e9 tenzometry jsou \u0161iroce pou\u017e\u00edv\u00e1ny pro m\u011b\u0159en\u00ed nap\u011bt\u00ed a deformace v r\u016fzn\u00fdch aplikac\u00edch, od automobilov\u00e9ho pr\u016fmyslu po letectv\u00ed.  D\u016fle\u017eit\u00e1 ot\u00e1zka, kter\u00e1 se p\u0159i jejich pou\u017e\u00edv\u00e1n\u00ed vyno\u0159uje, je opakovatelnost v\u00fdstupn\u00edho nap\u011bt\u00ed.  Tato ot\u00e1zka je kl\u00ed\u010dov\u00e1 pro spolehlivost m\u011b\u0159en\u00ed a celkov\u00e9 p\u0159esnosti z\u00edskan\u00fdch dat.  V n\u00e1sleduj\u00edc\u00edm textu se budeme zab\u00fdvat faktory ovliv\u0148uj\u00edc\u00ed opakovatelnost a mo\u017en\u00fdmi metodami pro jej\u00ed zlep\u0161en\u00ed.<\/p>\n<h3>Vliv materi\u00e1lov\u00fdch vlastnost\u00ed na opakovatelnost<\/h3>\n<p>Opakovatelnost v\u00fdstupn\u00edho nap\u011bt\u00ed piezok\u0159emenn\u00e9ho tenzometru je siln\u011b ovlivn\u011bna vlastnostmi pou\u017eit\u00e9ho piezoelektrick\u00e9ho materi\u00e1lu.  Nehomogenity v krystalick\u00e9 struktu\u0159e, p\u0159\u00edtomnost defekt\u016f a vnit\u0159n\u00ed nap\u011bt\u00ed mohou v\u00e9st k variabilit\u011b v generovan\u00e9m nap\u011bt\u00ed p\u0159i stejn\u00e9m mechanick\u00e9m zat\u00ed\u017een\u00ed.  Dal\u0161\u00ed faktor je teplotn\u00ed z\u00e1vislost piezoelektrick\u00e9ho efektu.  Zm\u011bny teploty mohou zp\u016fsobit zm\u011bny v dielektrick\u00e9 konstant\u011b a piezoelektrick\u00e9m koeficientu, co\u017e vede k nep\u0159esnostem v m\u011b\u0159en\u00ed.<\/p>\n<h3>Vliv konstrukce a mont\u00e1\u017ee tenzometru<\/h3>\n<p>Konstrukce a zp\u016fsob mont\u00e1\u017ee tenzometru hraj\u00ed tak\u00e9 d\u016fle\u017eitou roli.  Nespr\u00e1vn\u00e1 kalibrace, nedostate\u010dn\u00e9 mechanick\u00e9 spojen\u00ed s m\u011b\u0159en\u00fdm objektem, nebo p\u0159\u00edtomnost v\u016fl\u00ed mohou v\u00e9st k nep\u0159esnostem a sn\u00ed\u017een\u00e9 opakovatelnosti.  D\u016fle\u017eit\u00e9 je zajistit rovnom\u011brn\u00fd p\u0159enos s\u00edly mezi tenzometrem a m\u011b\u0159en\u00fdm objektem, aby se eliminovaly lok\u00e1ln\u00ed deformace.<\/p>\n<h3>Vliv vn\u011bj\u0161\u00edch faktor\u016f<\/h3>\n<p>Krom\u011b vlastnost\u00ed materi\u00e1lu a konstrukce tenzometru ovliv\u0148uj\u00ed opakovatelnost i vn\u011bj\u0161\u00ed faktory.  Vibrace, elektromagnetick\u00e9 ru\u0161en\u00ed a vlhkost mohou v\u00e9st k chyb\u00e1m v m\u011b\u0159en\u00ed.  D\u016fle\u017eit\u00e9 je proto zajistit stabiln\u00ed a kontrolovan\u00e9 prost\u0159ed\u00ed pro m\u011b\u0159en\u00ed.<\/p>\n<h3>Tabulka srovn\u00e1n\u00ed opakovatelnosti r\u016fzn\u00fdch typ\u016f piezok\u0159emenn\u00fdch tenzometr\u016f<\/h3>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Typ tenzometru<\/th>\n<th>Opakovatelnost [%]<\/th>\n<th>Pozn\u00e1mka<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Typ A<\/td>\n<td>\u00b10,5<\/td>\n<td>Vysok\u00e1 p\u0159esnost, dra\u017e\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Typ B<\/td>\n<td>\u00b11,0<\/td>\n<td>Standardn\u00ed p\u0159esnost, st\u0159edn\u00ed cena<\/td>\n<\/tr>\n<tr>\n<td>Typ C<\/td>\n<td>\u00b12,0<\/td>\n<td>Ni\u017e\u0161\u00ed p\u0159esnost, levn\u011bj\u0161\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Pozn\u00e1mka:<\/strong>  Hodnoty opakovatelnosti jsou orienta\u010dn\u00ed a mohou se li\u0161it v z\u00e1vislosti na konkr\u00e9tn\u00edch podm\u00ednk\u00e1ch m\u011b\u0159en\u00ed.<\/p>\n<h3>Metody pro zlep\u0161en\u00ed opakovatelnosti<\/h3>\n<p>K zlep\u0161en\u00ed opakovatelnosti v\u00fdstupn\u00edho nap\u011bt\u00ed lze pou\u017e\u00edt n\u011bkolik metod.  Pat\u0159\u00ed mezi n\u011b pe\u010dliv\u00e1 kalibrace tenzometru p\u0159ed m\u011b\u0159en\u00edm, pou\u017eit\u00ed vysoce kvalitn\u00edch piezoelektrick\u00fdch materi\u00e1l\u016f, optimalizace konstrukce tenzometru a pe\u010dliv\u00e1 mont\u00e1\u017e na m\u011b\u0159en\u00fd objekt.  D\u00e1le je d\u016fle\u017eit\u00e9 minimalizovat vliv vn\u011bj\u0161\u00edch faktor\u016f, jako jsou vibrace a elektromagnetick\u00e9 ru\u0161en\u00ed.  Pou\u017eit\u00ed vhodn\u00e9ho zesilova\u010de sign\u00e1lu s n\u00edzk\u00fdm \u0161umem tak\u00e9 p\u0159isp\u00edv\u00e1 k p\u0159esnosti m\u011b\u0159en\u00ed.<\/p>\n<p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee opakovatelnost v\u00fdstupn\u00edho nap\u011bt\u00ed piezok\u0159emenn\u00fdch tenzometr\u016f je ovlivn\u011bna mnoha faktory.  Kombinac\u00ed pe\u010dliv\u00e9ho v\u00fdb\u011bru materi\u00e1lu, optimalizovan\u00e9 konstrukce, spr\u00e1vn\u00e9 mont\u00e1\u017ee a minimalizac\u00ed vn\u011bj\u0161\u00edch vliv\u016f lze dos\u00e1hnout vysok\u00e9 opakovatelnosti a spolehlivosti m\u011b\u0159en\u00ed.  Pou\u017eit\u00ed kalibra\u010dn\u00edch procedur a vhodn\u00fdch m\u011b\u0159ic\u00edch syst\u00e9m\u016f je kl\u00ed\u010dov\u00e9 pro z\u00edsk\u00e1n\u00ed p\u0159esn\u00fdch a reprodukovateln\u00fdch v\u00fdsledk\u016f.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Piezok\u0159emenn\u00e9 tenzometry jsou \u0161iroce pou\u017e\u00edv\u00e1ny pro m\u011b\u0159en\u00ed nap\u011bt\u00ed a deformace v r\u016fzn\u00fdch aplikac\u00edch, od automobilov\u00e9ho pr\u016fmyslu po letectv\u00ed. D\u016fle\u017eit\u00e1 ot\u00e1zka, kter\u00e1 se p\u0159i jejich pou\u017e\u00edv\u00e1n\u00ed vyno\u0159uje, je opakovatelnost v\u00fdstupn\u00edho nap\u011bt\u00ed. Tato ot\u00e1zka je kl\u00ed\u010dov\u00e1 pro spolehlivost m\u011b\u0159en\u00ed a celkov\u00e9 p\u0159esnosti z\u00edskan\u00fdch dat. V n\u00e1sleduj\u00edc\u00edm textu se budeme zab\u00fdvat faktory ovliv\u0148uj\u00edc\u00ed opakovatelnost a mo\u017en\u00fdmi metodami pro<\/p>\n","protected":false},"author":1,"featured_media":5004,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-62846","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\/62846","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=62846"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/62846\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/5004"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=62846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=62846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=62846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}