Atmospheric Transmission Beer's Law

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3/31/10Properties of Beer’s <strong>Law</strong>• For propagation of radiation over an optical path τ
3/31/10Optical depthThe optical depth expresses the quantity of light removed from a beam by absorptionor scattering during its path through a medium.If τ = 0.5, transmissivity = ~60%, if τ = 1, t = ~37% and if τ = 2.5, t = ~8%.If τ > 1, the medium is optically thickOptical depthIf a gas is optically thick, a photon will interact many,many times with particles before it finally escapesfrom the cloud. Any photon entering the cloud willhave its direction changed many times by scattering –so its ‘output’ direction has nothing to do with its‘input’ direction. We can't see anything at all throughthe cloud: it is opaque.You can't see through an optically thick medium; youcan only see light emitted by the very outermostlayers. But there is one convenient feature of opticallythick materials: the spectrum of the light they emit is ablackbody spectrum, or very close to it.9
Page 1 and 2: 3/31/10Atmospheric TransmissionBeer
Page 3 and 4: 3/31/10Extinction of radiation• A
Page 5 and 6: 3/31/10• β e = β a + β sExtinc
Page 10 and 11: 3/31/10Optical depth problemThe opt
Page 12 and 13: 3/31/10More Beer’s LawNow taking
Page 14 and 15: 3/31/10Deviations from Beer’s Law
Page 16 and 17: ONREMOTE CONTROLTX IN RX IN PPS-CON
Page 18 and 19: 3/31/10Slant and vertical atmospher
Page 20 and 21: 3/31/10Atmospheric transmittanceUV-
Page 22 and 23: 3/31/10Extinction and scattering by
Page 24 and 25: 3/31/10Measuring solar intensity fr
Page 26 and 27: 3/31/10Mass pathτ (z) = k aw 1ρ 0
Page 28 and 29: 3/31/10Optical thickness and transm
Page 30 and 31: 3/31/10The Aerosol Indirect Effect

Atmospheric Transmission Beer's Law

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