{"id":14166,"date":"2023-09-24T15:24:26","date_gmt":"2023-09-24T15:24:26","guid":{"rendered":"https:\/\/www.rayzeek.com\/?p=14166"},"modified":"2023-12-26T08:44:53","modified_gmt":"2023-12-26T08:44:53","slug":"what-is-transmittance","status":"publish","type":"post","link":"https:\/\/www.rayzeek.com\/fr\/glossaire\/quest-ce-que-la-transmittance","title":{"rendered":"Qu'est-ce que la transmittance ?"},"content":{"rendered":"

Qu'est-ce que la transmittance ?<\/h2>

La transmittance est la mesure de la quantit\u00e9 de lumi\u00e8re capable de traverser une surface ou un mat\u00e9riau. Il s'agit d'une propri\u00e9t\u00e9 optique fondamentale qui quantifie la capacit\u00e9 d'un mat\u00e9riau \u00e0 transmettre la lumi\u00e8re. <\/p>

Lorsque la lumi\u00e8re interagit avec une surface ou un mat\u00e9riau, elle peut \u00eatre transmise, r\u00e9fl\u00e9chie ou absorb\u00e9e. La transmittance se concentre sp\u00e9cifiquement sur la partie de la lumi\u00e8re qui passe de l'autre c\u00f4t\u00e9 de la surface. Elle est \u00e9troitement li\u00e9e au concept de r\u00e9flectance, qui mesure la quantit\u00e9 de lumi\u00e8re r\u00e9fl\u00e9chie par une surface.<\/p>

La transmittance est exprim\u00e9e sous la forme d'un rapport entre l'intensit\u00e9 de la lumi\u00e8re transmise (I) et l'intensit\u00e9 de la lumi\u00e8re incidente (I0). Ce rapport est not\u00e9 T. La valeur de la transmittance repr\u00e9sente le pourcentage de la lumi\u00e8re incidente qui peut traverser le mat\u00e9riau.<\/p>

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Prenons l'exemple d'un bloc de verre semi-transparent. Si 30% de la lumi\u00e8re incidente sont r\u00e9fl\u00e9chis par la surface du verre et que 35% sont absorb\u00e9s par les mol\u00e9cules du verre, les 35% de lumi\u00e8re restants traverseront l'autre c\u00f4t\u00e9 du bloc. Dans ce cas, le bloc de verre a une transmittance de 35%.<\/p>

Le facteur de transmission est important car il affecte la performance et l'efficacit\u00e9 des syst\u00e8mes d'\u00e9clairage. En comprenant la transmittance des diff\u00e9rents mat\u00e9riaux, les professionnels de l'\u00e9clairage peuvent prendre des d\u00e9cisions \u00e9clair\u00e9es sur la s\u00e9lection des mat\u00e9riaux et la conception des syst\u00e8mes d'\u00e9clairage afin d'atteindre les niveaux d'\u00e9clairage et l'efficacit\u00e9 \u00e9nerg\u00e9tique souhait\u00e9s.<\/p>

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D\u00e9tecteurs de mouvement PIR<\/p><\/a><\/div><\/div>

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Questions fr\u00e9quemment pos\u00e9es<\/h2>\n\n

Que signifie la transmission de la lumi\u00e8re 12% ?<\/h3><\/div><\/div>\n\n

La transmission visuelle de la lumi\u00e8re, \u00e9galement connue sous le nom de TLV, d\u00e9signe le pourcentage de lumi\u00e8re visible qui peut passer \u00e0 travers une lentille. Dans le cas d'une lentille dont la TLV est de 12%, cela signifie que seule 12% de la lumi\u00e8re peut passer, tandis que les 88% restants sont bloqu\u00e9s.<\/p><\/div><\/div><\/div><\/div>\n\n

Que signifie la transmission de la lumi\u00e8re 13% ?<\/h3><\/div><\/div>\n\n

La transmission de la lumi\u00e8re visible (TLV) est un terme que l'on rencontre souvent lorsqu'on \u00e9tudie les lunettes de soleil. Il d\u00e9signe la quantit\u00e9 de lumi\u00e8re qui traverse la lentille et atteint l'\u0153il. Dans le cas de la transmission de la lumi\u00e8re 13%, cela signifie qu'un pourcentage plus faible de lumi\u00e8re est transmis \u00e0 travers la lentille. Cela signifie que les lunettes de soleil ont un VLT plus faible que les lunettes de soleil standard, qui ont g\u00e9n\u00e9ralement un VLT de 15 \u00e0 25%.<\/p><\/div><\/div><\/div><\/div>\n\n

Quel est un exemple de transmission de la lumi\u00e8re ?<\/h3><\/div><\/div>\n\n

La transmission de la lumi\u00e8re est le processus par lequel la lumi\u00e8re traverse un mat\u00e9riau transparent ou translucide. Un exemple de transmission de la lumi\u00e8re est celui de la lumi\u00e8re du soleil qui p\u00e9n\u00e8tre dans une pi\u00e8ce par une fen\u00eatre et l'illumine.<\/p><\/div><\/div><\/div><\/div>\n\n

Quel est l'objectif de la transmittance ?<\/h3><\/div><\/div>\n\n

L'objectif de la transmittance est d'aider \u00e0 identifier les substances inconnues et \u00e0 d\u00e9terminer leur concentration dans un \u00e9chantillon. En utilisant un ensemble d'\u00e9talons et un tableau de transmittance \u00e0 absorbance, les valeurs de transmittance peuvent \u00eatre rapidement converties en absorbance, tant en laboratoire que sur le terrain.<\/p><\/div><\/div><\/div><\/div>\n\n

Que signifie un pourcentage \u00e9lev\u00e9 de transmission de la lumi\u00e8re ?<\/h3><\/div><\/div>\n\n

Ainsi, un pourcentage \u00e9lev\u00e9 de transmission de la lumi\u00e8re indique que l'absorption de la lumi\u00e8re est minime, voire nulle. Inversement, un faible pourcentage de transmission de la lumi\u00e8re indique que la quantit\u00e9 de lumi\u00e8re absorb\u00e9e est plus importante. Dans le cas o\u00f9 un \u00e9chantillon absorbe totalement la lumi\u00e8re, le pourcentage de transmittance est \u00e9gal \u00e0 z\u00e9ro.<\/p><\/div><\/div><\/div><\/div>\n\n

Qu'est-ce que la transmittance ou l'absorption de la lumi\u00e8re ?<\/h3><\/div><\/div>\n\n

La transmittance correspond \u00e0 la mesure de la quantit\u00e9 de lumi\u00e8re qui traverse l'\u00e9chantillon, tandis que l'absorbance correspond \u00e0 la mesure de la quantit\u00e9 de lumi\u00e8re qui est absorb\u00e9e par l'\u00e9chantillon.<\/p><\/div><\/div><\/div><\/div>\n\n

Que signifie 100 Transmittance ?<\/h3><\/div><\/div>\n\n

Une transmittance de 100 indique que le compos\u00e9 laisse passer toute la fr\u00e9quence sans aucune absorption.<\/p><\/div><\/div><\/div><\/div>\n\n

Qu'est-ce qu'une faible transmittance ?<\/h3><\/div><\/div>\n\n

Des valeurs plus faibles de la transmittance du % indiquent que le compos\u00e9 absorbe une partie de l'\u00e9nergie, ce qui entra\u00eene l'apparition de pics vers le bas.<\/p><\/div><\/div><\/div><\/div>\n\n

Qu'est-ce que la valeur de transmission de la lumi\u00e8re ?<\/h3><\/div><\/div>\n\n

Le facteur de transmission de la lumi\u00e8re visible (VLT) d\u00e9signe le pourcentage de lumi\u00e8re visible qui peut traverser un mat\u00e9riau de vitrage. Il s'agit d'un facteur important pour optimiser l'\u00e9clairage naturel.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

La transmittance est la mesure de la quantit\u00e9 de lumi\u00e8re capable de traverser une surface ou un mat\u00e9riau. 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