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4-cours rayonnement

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Flux émis<br />

M = dΦ / dS<br />

10-Emittance 10 Emittance M<br />

mis<br />

par unité unit de surface<br />

dans toutes les directions<br />

dS<br />

Or on a vu Φ = ?<br />

Φ = ε S σ T4 Φ<br />

Alors M = ?<br />

• M = ε σ T4 Unités Unit<br />

en W.m -2 .<br />

dΦ<br />

Pour un corps Lambertien, Lambertien,<br />

on démontre d montre que M = π L<br />

dS’<br />

21

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