{"id":26985,"date":"2020-11-15T00:01:00","date_gmt":"2020-11-15T03:01:00","guid":{"rendered":"https:\/\/www.ufrgs.br\/amlef\/?p=26985"},"modified":"2020-11-15T00:03:42","modified_gmt":"2020-11-15T03:03:42","slug":"galvanometro-de-bourbouze","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/amlef\/2020\/11\/15\/galvanometro-de-bourbouze\/","title":{"rendered":"Galvan\u00f4metro de Bourbouze"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Jean-Gustave Bour\u00adbouze (1825 \u2013 1889) nasceu em Paris, Fran\u00e7a, e come\u00e7ou sua car\u00adreira como ope\u00adr\u00e1\u00adrio mec\u00e2\u00adnico. Em 1849 foi indi\u00adcado por Claude Pouil\u00adlet como f\u00edsico e tutor do gabi\u00adnete de f\u00edsica da Facul\u00addade de Ci\u00ean\u00adcias de Paris, onde auxi\u00adliou Le\u00f3n Fou\u00adcault na pre\u00adpa\u00adra\u00ad\u00e7\u00e3o do expe\u00adri\u00admento do P\u00eandulo de Fou\u00adcault, em 1851. Al\u00e9m da veia cien\u00adt\u00ed\u00adfica, tamb\u00e9m se des\u00adta\u00adcava pelo tino peda\u00adg\u00f3\u00adgico: fre\u00adquen\u00adte\u00admente minis\u00adtrava cursos e ofi\u00adci\u00adnas de gra\u00e7a para estu\u00addan\u00adtes, \u00e0s vezes em sua pr\u00f3pria casa. A <a href=\"https:\/\/www.ufrgs.br\/amlef\/glossario\/jean-gustave-bourbouze\/\">bio\u00adgra\u00adfia<\/a> deste not\u00e1vel franc\u00eas pode ser con\u00adfe\u00adrida em maior pro\u00adfun\u00addi\u00addade no <a href=\"https:\/\/www.ufrgs.br\/amlef\/glossario\/jean-gustave-bourbouze\/\">Glos\u00ads\u00e1\u00adrio<\/a> desta p\u00e1gina.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tendo em vista a liga\u00e7\u00e3o de Bour\u00adbouze com ati\u00advi\u00adda\u00addes de cunho peda\u00adg\u00f3\u00adgica, o Gal\u00advan\u00f4\u00adme\u00adtro pro\u00adje\u00adtado por ele tem como prin\u00adci\u00adpal obje\u00adtivo o ensino de ele\u00adtro\u00admag\u00adne\u00adtismo. Isso se reflete em algumas carac\u00adte\u00adr\u00eds\u00adti\u00adcas desse equi\u00adpa\u00admento que n\u00e3o se trata, por\u00adtanto, de um ins\u00adtru\u00admento de pre\u00adci\u00ads\u00e3o para medida, mas sim de demonstra\u00e7\u00e3o.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignleft size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Esquema.jpg\" alt class=\"wp-image-27000\" width=\"145\" height=\"292\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Esquema.jpg 205w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Esquema-149x300.jpg 149w\" sizes=\"auto, (max-width: 145px) 100vw, 145px\"><figcaption>Figura 1. Esquema de funcionamento<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Assim como os demais gal\u00advan\u00f4\u00adme\u00adtros, o de Bour\u00adbouze fun\u00adci\u00adona a partir da defle\u00adx\u00e3o de uma agulha pelo campo mag\u00adn\u00e9\u00adtico gerado por uma cor\u00adrente el\u00e9\u00adtrica que passa pela bobina do apa\u00adre\u00adlho; um esquema de fun\u00adci\u00ado\u00adna\u00admento pode ser visu\u00ada\u00adli\u00adzado na figura 1. O dife\u00adren\u00adcial deste aparato, no entanto, \u00e9 sua forma de cons\u00adtru\u00ad\u00e7\u00e3o: o sistema \u00edm\u00e3-pon\u00adteiro, situado no meio de uma bobina enro\u00adlada hori\u00adzon\u00adtal\u00admente, \u00e9 con\u00adfi\u00adgu\u00adrado de modo que \u00edm\u00e3 fique em posi\u00e7\u00e3o per\u00adpen\u00addi\u00adcu\u00adlar ao pon\u00adteiro, que em sua posi\u00e7\u00e3o de repouso (aus\u00ean\u00adcia de cor\u00adrente na bobina) fica ali\u00adnhado \u00e0 ver\u00adti\u00adcal. Esta carac\u00adte\u00adr\u00eds\u00adtica permite a demons\u00adtra\u00ad\u00e7\u00e3o da pas\u00adsa\u00adgem de cor\u00adren\u00adtes con\u00adt\u00ed\u00adnuas nos dife\u00adren\u00adtes sentidos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ao passar cor\u00adrente pela bobina, \u00e9 indu\u00adzido um campo mag\u00adn\u00e9\u00adtico B no inte\u00adrior desta que oca\u00adsi\u00adona o sur\u00adgi\u00admento de um par de for\u00e7as (F, \u2013F) no \u00edm\u00e3 e provoca o movi\u00admento do refe\u00adrido sistema. A defle\u00adx\u00e3o do pon\u00adteiro \u00e9 ent\u00e3o lida numa escala gra\u00addu\u00adada e cor\u00adres\u00adponde a uma deter\u00admi\u00adnada inten\u00adsi\u00addade de cor\u00adrente. \u00c9 inte\u00adres\u00adsante per\u00adce\u00adber que a escala do equi\u00adpa\u00admento n\u00e3o est\u00e1 em Amp\u00e8res, mas em graus, pois o que se demons\u00adtra aqui \u00e9 a defle\u00adx\u00e3o do pon\u00adteiro, n\u00e3o uma medida precisa da cor\u00adrente el\u00e9trica.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Agulha-galvanometro-de-Bourbouze-1.jpg\" alt class=\"wp-image-27004\" width=\"214\" height=\"416\"><figcaption>Figura 2. Deta\u00adlhes da parte m\u00f3vel do sistema do artigo ori\u00adgi\u00adnal de Jean-Gustave Bou\u00adbouze [4]. A barra AB \u00e9 iman\u00adtada, as massas m e m\u2019 servem para ajuste do zero na escala e a massa m\u201d pos\u00adsi\u00adbi\u00adlita o ajuste fino de sensibilidade.<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Esse modelo de gal\u00advan\u00f4\u00adme\u00adtro, de forma similar a alguns gal\u00advan\u00f4\u00adme\u00adtros tra\u00adta\u00addos ante\u00adri\u00ador\u00admente, est\u00e1 sujeito ao campo mag\u00adn\u00e9\u00adtico ter\u00adres\u00adtre. A inte\u00adra\u00ad\u00e7\u00e3o do \u00edm\u00e3 com o campo da Terra pode alterar a sen\u00adsi\u00adbi\u00adli\u00addade do equi\u00adpa\u00admento ou alterar o ponto de repouso do pon\u00adteiro. Na figura 2, pode-se visu\u00ada\u00adli\u00adzar o sistema de uma forma mais veros\u00ads\u00ed\u00admil: \u00e9 inte\u00adres\u00adsante notar que \u00e9 pos\u00ads\u00ed\u00advel ajustar a ajustar o zero do gal\u00advan\u00f4\u00adme\u00adtro ao variar a posi\u00e7\u00e3o das massas m e m\u2019. O modelo ilus\u00adtrado possui uma ter\u00adceira massa (m\u201d) ao longo do pon\u00adteiro para ajustar a sen\u00adsi\u00adbi\u00adli\u00addade do equi\u00adpa\u00admento mudando o centro de gra\u00advi\u00addade do sistema \u00edm\u00e3-ponteiro.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignleft size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Galvanometro-de-Bourbouze-739x1024.jpg\" alt class=\"wp-image-26988\" width=\"189\" height=\"262\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Galvanometro-de-Bourbouze-739x1024.jpg 739w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Galvanometro-de-Bourbouze-216x300.jpg 216w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Galvanometro-de-Bourbouze-768x1064.jpg 768w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Galvanometro-de-Bourbouze-1108x1536.jpg 1108w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Galvanometro-de-Bourbouze-1478x2048.jpg 1478w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Galvanometro-de-Bourbouze-205x284.jpg 205w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/11\/Galvanometro-de-Bourbouze-scaled.jpg 1847w\" sizes=\"auto, (max-width: 189px) 100vw, 189px\"><figcaption>Figura 3. Gal\u00advan\u00f4\u00adme\u00adtro de Bour\u00adbouze per\u00adten\u00adcente ao acervo do&nbsp;AMLEF<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">O ins\u00adtru\u00admento tamb\u00e9m pos\u00adsi\u00adbi\u00adlita seu uso como gal\u00advan\u00f4\u00adme\u00adtro dife\u00adren\u00adcial, pois possui duas bobinas inde\u00adpen\u00adden\u00adtes no seu enro\u00adla\u00admento, cada uma com dois bornes de contato tota\u00adli\u00adzando, como pode ser obser\u00advado na figura 3. Ao conec\u00adtar-se dois sis\u00adte\u00admas el\u00e9\u00adtri\u00adcos que geram cor\u00adrente de maneira inversa, os res\u00adpec\u00adti\u00advos campos mag\u00adn\u00e9\u00adti\u00adcos gerados sub\u00adtrair-se-\u00e3o e o sistema \u00edm\u00e3-pon\u00adteiro sofrer\u00e1 a a\u00e7\u00e3o mag\u00adn\u00e9\u00adtica res\u00adpec\u00adtiva \u00e0 dife\u00adren\u00e7a de inten\u00adsi\u00addade das duas correntes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Outra demons\u00adtra\u00ad\u00e7\u00e3o que pode ser rea\u00adli\u00adzada com este gal\u00advan\u00f4\u00adme\u00adtro \u00e9 a vari\u00ada\u00ad\u00e7\u00e3o da inten\u00adsi\u00addade do campo mag\u00adn\u00e9\u00adtico dentro da bobina e nas suas extre\u00admi\u00adda\u00addes. Existe um para\u00adfuso que permite des\u00adlo\u00adcar o sistema de medida ver\u00adti\u00adcal\u00admente, apro\u00adxi\u00admando ou afas\u00adtando o \u00edm\u00e3 do centro das bobinas. Com isso pode-se medir o perfil de inten\u00adsi\u00addade do campo mag\u00adn\u00e9\u00adtico gerado pelas bobinas.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h5 class=\"has-text-align-right wp-block-heading\"><strong>Daniel Zorrer \/ Equipe AMLEF&nbsp;2020<\/strong><\/h5>\n\n\n\n<hr class=\"wp-block-separator is-style-wide\">\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Saiba mais<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O v\u00eddeo a seguir, pro\u00addu\u00adzido pela Uni\u00adver\u00adsit\u00e9 Claude Bernard Lyon 1 (em franc\u00eas), possui expli\u00adca\u00ad\u00e7\u00f5es e demons\u00adtra\u00ad\u00e7\u00f5es do fun\u00adci\u00ado\u00adna\u00admento deste equi\u00adpa\u00admento de ensino.<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Galvanom\u00e8tre de Bourbouze - Fonctionnement\" width=\"1400\" height=\"788\" src=\"https:\/\/www.youtube.com\/embed\/09sDtvf7f9c?start=87&amp;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator is-style-wide\">\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Refer\u00eancias Bibliogr\u00e1ficas<\/strong><\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>MART\u00cdNEZ, Mar\u00eda Jes\u00fas Mart\u00edn. ROCO, Jos\u00e9 Miguel Mateos. BAYO, Jose Ignacio I\u00f1iguez de la Torre y. Anti\u00adguos Apa\u00adra\u00adtos De Labo\u00adra\u00adto\u00adrio De F\u00edsica De La Uni\u00adver\u00adsi\u00addad De Sala\u00admanca. Dis\u00adpo\u00adn\u00ed\u00advel em &lt;<a href=\"http:\/\/museo.fis.usal.es\/media\/documentacion\/catalogo.pdf\">http:\/\/museo.fis.usal.es\/media\/documentacion\/catalogo.pdf<\/a>&gt;.<\/li><li>MALAQUIAS, Isabel. ANDRADE, Ant\u00f3nio. BONIF\u00c1CIO, Vitor. MALONEK, Helmuth. A prancha de aces\u00ads\u00f3\u00adrios do gal\u00advan\u00f4\u00adme\u00adtro de bour\u00adbouze. Dis\u00adpo\u00adn\u00ed\u00advel <a href=\"https:\/\/issuu.com\/nauticalschool\/docs\/a_prancha_de_acess__rios_do_galvan_\">neste link<\/a>. <\/li><li>BOURBOUZE, Jean Gustave. Modes op\u00e9\u00adra\u00adtoi\u00adres de Phy\u00adsi\u00adque. Paris: Impri\u00adme\u00adrie E. Des\u00adgrand\u00adchamps, 1896. Dis\u00adpo\u00adn\u00ed\u00advel <a href=\"https:\/\/bdor.sibi.ufrj.br\/bitstream\/doc\/492\/3\/667016.pdf\">neste link<\/a>.<\/li><li>BOURBOUZE. Gal\u00adva\u00adnom\u00e8\u00adtre ver\u00adti\u00adcal \u00e0 fl\u00e9au. J. Phys. Theor. Appl., 1872, 1 (1), pp.189\u2013190. Dis\u00adpo\u00adn\u00ed\u00advel <a href=\"https:\/\/hal.archives-ouvertes.fr\/jpa-00236773\/document\">neste link<\/a>.<\/li><li>LUCENDO, Jorge. Century of Inven\u00adti\u00adons: Ency\u00adclo\u00adpe\u00addia and History of Inven\u00adti\u00adons. Par\u00adci\u00adal\u00admente dis\u00adpo\u00adn\u00ed\u00advel <a href=\"https:\/\/books.google.com.br\/books?id=4l3eDwAAQBAJ&amp;pg=PT56&amp;lpg=PT56&amp;dq=jean+gustave+bourbouze&amp;source=bl&amp;ots=aIERd1XvTt&amp;sig=ACfU3U1n_cPkDMQ2ulom6QIdJVy5jAqqaQ&amp;hl=pt-BR&amp;sa=X&amp;ved=2ahUKEwjtquOYk8HqAhXiLLkGHbxbASQQ6AEwDnoECBAQAQ#v=onepage&amp;q=%22vertical%20galvanometer%22&amp;f=false\">neste link<\/a>.<\/li><li>Demons\u00adtra\u00adtion gal\u00adva\u00adno\u00adme\u00adter with moving magnet. Dis\u00adpo\u00adn\u00ed\u00advel em: &lt;<a href=\"http:\/\/waywiser.fas.harvard.edu\/objects\/13876\/demonstration-galvanometer-with-moving-magnet?ctx=d627e7b0-e3da-47d5-bec7-d8c2139b91a9&amp;idx=97\">http:\/\/waywiser.fas.harvard.edu\/objects\/13876\/demonstration-galvanometer-with-moving-magnet?ctx=d627e7b0-e3da-47d5-bec7-d8c2139b91a9&amp;idx=97<\/a>&gt;.<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Jean-Gustave Bour\u00adbouze (1825 \u2013 1889) nasceu em Paris, Fran\u00e7a, e come\u00e7ou sua car\u00adreira como ope\u00adr\u00e1\u00adrio mec\u00e2\u00adnico. Em 1849 foi indi\u00adcado por Claude Pouil\u00adlet como f\u00edsico e tutor do gabi\u00adnete de f\u00edsica da Facul\u00addade de Ci\u00ean\u00adcias de Paris, onde auxi\u00adliou Le\u00f3n Fou\u00adcault na pre\u00adpa\u00adra\u00ad\u00e7\u00e3o do expe\u00adri\u00admento do P\u00eandulo de Fou\u00adcault, em 1851. Al\u00e9m da veia cient\u00edfica,&nbsp;[\u2026]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","wp_typography_post_enhancements_disabled":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[432,514],"tags":[415,529,527,518],"class_list":["post-26985","post","type-post","status-publish","format-standard","hentry","category-destaques","category-exposicaogalvanometros","tag-eletromagnetismo","tag-ensino","tag-galvanometro","tag-historia-eletromagnetismo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Galvan\u00f4metro de Bourbouze - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ufrgs.br\/amlef\/2020\/11\/15\/galvanometro-de-bourbouze\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Galvan\u00f4metro de Bourbouze - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Jean-Gustave Bour\u00adbouze (1825 \u2013 1889) nasceu em Paris, Fran\u00e7a, e come\u00e7ou sua car\u00adreira como ope\u00adr\u00e1\u00adrio mec\u00e2\u00adnico. Em 1849 foi indi\u00adcado por Claude Pouil\u00adlet como f\u00edsico e tutor do gabi\u00adnete de f\u00edsica da Facul\u00addade de Ci\u00ean\u00adcias de Paris, onde auxi\u00adliou Le\u00f3n Fou\u00adcault na pre\u00adpa\u00adra\u00ad\u00e7\u00e3o do expe\u00adri\u00admento do P\u00eandulo de Fou\u00adcault, em 1851. 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