{"id":6706,"date":"2023-08-28T09:09:05","date_gmt":"2023-08-28T08:09:05","guid":{"rendered":"https:\/\/gf-eez.com\/?p=6706"},"modified":"2023-10-25T08:51:45","modified_gmt":"2023-10-25T07:51:45","slug":"mesure-de-debit-par-effet-doppler","status":"publish","type":"post","link":"https:\/\/gf-eez.com\/fr\/mesure-de-debit-par-effet-doppler\/","title":{"rendered":"Mesure de d\u00e9bit par effet Doppler"},"content":{"rendered":"\t\t
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Principe de fonctionnement des d\u00e9bitm\u00e8tres \u00e0 ultrasons - L'effet Doppler<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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D\u00e9finition de l'effet Doppler<\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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L\u2019effet Doppler, connu sous le nom de d\u00e9calage Doppler, est un ph\u00e9nom\u00e8ne que l\u2019on rencontre couramment.\u00a0<\/span>Placez-vous le long d\u2019une voie rapide et que remarquez-vous lors du passage d\u2019une voiture ayant une vitesse \u00e9lev\u00e9e\u00a0?\u00a0<\/span><\/p>

Le son de la voiture est plus aigu lorsque la voiture approche (fr\u00e9quence sonore plus \u00e9lev\u00e9e) et qu\u2019il devient soudainement plus grave lorsque la voiture s\u2019\u00e9loigne de vous (fr\u00e9quence sonore plus basse).<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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La raison \u00e0 tout cela ?<\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Les ondes sonores sont comprim\u00e9es dans une certaine mesure lorsque la voiture (l\u2019\u00e9metteur) vient vers vous \u00e0 une certaine vitesse. Cela se traduit par une fr\u00e9quence plus \u00e9lev\u00e9e et donc une tonalit\u00e9 plus aigu\u00eb. De m\u00eame, les ondes sonores se dilatent lorsque l\u2019\u00e9metteur s\u2019\u00e9loigne, ce qui donne une tonalit\u00e9 plus grave.<\/span><\/p>

La vitesse aura donc une importance significative sur les fr\u00e9quences per\u00e7ues.<\/span><\/p>

Consid\u00e9rons maintenant que ces voitures sont des particules pr\u00e9sentes dans un fluide transitant dans une tuyauterie et installons sur cette tuyauterie\u00a0un<\/b>\u00a0\u00e9metteur d\u2019ondes sonores.<\/b><\/span><\/p>

Le changement de fr\u00e9quence \u00e9tant directement li\u00e9 \u00e0 la vitesse des particules refl\u00e9t\u00e9es et en mouvement, ce d\u00e9calage de fr\u00e9quence permet de mesurer la vitesse d\u2019\u00e9coulement des particules r\u00e9fl\u00e9chissantes (et en mouvement), et donc du fluide contenant ces particules.<\/span><\/p>

Ces particules que l\u2019on nommera discontinuit\u00e9s r\u00e9fl\u00e9chissent\u00a0l<\/b>‘onde ultrasonique<\/b>\u00a0avec une fr\u00e9quence l\u00e9g\u00e8rement diff\u00e9rente.\u00a0<\/span>Pour cette raison,\u00a0notre d\u00e9bitm\u00e8tre \u00e0 effet Doppler doit mesurer des d\u00e9bits de liquides ayant des\u00a0particules en suspensions.<\/span><\/p>

Ce sont ces particules qui refl\u00e8tent les ondes ultrasonores, on ne peut donc pas utiliser\u00a0un\u00a0d\u00e9bitm\u00e8tre Doppler<\/b>\u00a0pour des liquides exempts de particules.\u00a0<\/span><\/p>

Les ultrasons sont transmis dans la conduite avec le liquide en \u00e9coulement, et les discontinuit\u00e9s r\u00e9fl\u00e9chissent l’onde ultrasonique avec une fr\u00e9quence l\u00e9g\u00e8rement diff\u00e9rente qui est directement proportionnelle \u00e0 la vitesse d’\u00e9coulement du liquide.<\/span><\/p>

Cette fr\u00e9quence est directement proportionnelle \u00e0 la\u00a0<\/span>vitesse d’\u00e9coulement du liquide<\/b>, en connaissant la vitesse du fluide ainsi que le diam\u00e8tre int\u00e9rieur de la tuyauterie, on peut ais\u00e9ment en extraire le d\u00e9bit.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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D\u00e9bim\u00e8tre Doppler Georg Fischer : Type UD 2100<\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Pour cette raison, notre d\u00e9bitm\u00e8tre \u00e0 effet Doppler doit mesurer des d\u00e9bits de liquides ayant des particules en suspensions.\u00a0<\/span>La technologie GF demande\u00a0des particules ou bulles ayant une taille minimale de 100 microns et une concentration\u00a0minimale de 75 ppm (particules par million).<\/span><\/p>

  • Le d\u00e9bitm\u00e8tre ultrason GF est un d\u00e9bitm\u00e8tre \u00e0 capteur simple.<\/span><\/li>
  • Il est bidirectionnel<\/span><\/li>
  • Disponible en version fixe ou portable<\/span><\/li>
  • R\u00e9p\u00e9tabilit\u00e9 : +\/- 0,25%, lin\u00e9arit\u00e9 +\/- 0,5%<\/span><\/li>
  • Plage de d\u00e9bit : +\/- 0,075 \u00e0 12,2 m\/sec dans la plupart des applications<\/span><\/li>
  • Diam\u00e8tre de conduite : 12,5 mm \u00e0 4,5 m (1\/2\u2019\u2019 \u00e0 180\u2019\u2019 ID)<\/span><\/li>
  • Affichage : D\u00e9bit instantan\u00e9, totaliseur, mode de fonctionnement et menu d\u2019\u00e9talonnage.<\/span><\/li>
  • Enregistrement de donn\u00e9es : Une capacit\u00e9 de 300 000 points de donn\u00e9es programmable<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    Dans cette version \u00e0 capteur simple,\u00a0les cristaux de transmission et de r\u00e9ception<\/b>\u00a0sont enferm\u00e9s dans le m\u00eame corps de capteur, qui est fix\u00e9 en un seul point de la surface du tuyau.<\/span><\/p>

    Le d\u00e9bitm\u00e8tre ultrason \u00e0 effet Doppler \u00e0 pince\u00a0<\/span><\/b>peut \u00eatre sensible aux interf\u00e9rences provenant de la paroi m\u00eame du tuyau ainsi qu\u2019\u2019\u00e0 la pr\u00e9sence de film d\u2019air entre la paroi et le liquide.<\/span><\/p>

    Certains rev\u00eatements tel que les peintures \u00e9poxy ou les tuyauteries renforc\u00e9s \u00e0 la fibre de verre peuvent g\u00e9n\u00e9rer des discontinuit\u00e9s acoustiques. Ces discontinuit\u00e9s peuvent disperser compl\u00e8tement le signal transmis, soit att\u00e9nuer le signal de retour.<\/span><\/p>

    La mesure s\u2019en trouvera alt\u00e9r\u00e9e. P<\/span>our assurer une\u00a0mesure pr\u00e9cise, il suffit d\u2019enlever le rev\u00eatement\u00a0et si cela n\u2019est pas possible, on trouvera\u00a0une partie de piping non rev\u00eatue.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

    Principe de fonctionnement des d\u00e9bitm\u00e8tres \u00e0 ultrasons – L’effet Doppler D\u00e9finition de l’effet Doppler L\u2019effet Doppler, connu sous le nom de d\u00e9calage Doppler, est un ph\u00e9nom\u00e8ne que l\u2019on rencontre couramment.\u00a0Placez-vous le long d\u2019une voie rapide et que remarquez-vous lors du passage d\u2019une voiture ayant une vitesse \u00e9lev\u00e9e\u00a0? Le son de la voiture est plus aigu …<\/p>\n","protected":false},"author":124,"featured_media":6792,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[110],"tags":[253,254],"hashtags":[],"class_list":["post-6706","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-techniques-de-mesure","tag-effet-doppler","tag-techniques-de-mesure","has-thumb","has-featured"],"yoast_head":"\nMesure de d\u00e9bit par effet Doppler – GF - Expert Engineering Zone<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez comment fonctionne les techniques de mesure gr\u00e2ce \u00e0 l'effet Doppler, notamment les d\u00e9bitm\u00e8tres de type UD 2100 de GF Piping Systems.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gf-eez.com\/fr\/mesure-de-debit-par-effet-doppler\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mesure de d\u00e9bit par effet Doppler – GF - 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