Optical Remote Sensing of Air Pollution: Lectures of a by P. Camagni, S. Sandroni

By P. Camagni, S. Sandroni

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Extra resources for Optical Remote Sensing of Air Pollution: Lectures of a Course Held at the Joint Research Centre, Ispra (Italy), 12-15 April 1983 (Ispra courses on chemical and environmental science)

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Aj) = Σ / ' Ρ(ί + λ: + λ)άλ (15) It can be easily shown that each t e r m in this sum r e a c h e s a maximum or minimum when: PCÎ + Xj+Ai) = P t t + A j - A j ) (16) for each slit J, i. e. , for each value of the c r o s s - c o r r e l a t i o n coordinate that places the centreline position of slit J, in a position -f+Xj- such that both ends of the slit intercept equal values of the radiant power R . This can be used as a first c r i t e r i o n (a) for the selection of the slits in a m a s k .

E-2QEX (8) α Λ (r)-dr a3Ελ cl == //α λ we get P rX (R) = ^ · k· Ρ ο χ . ^ - . e (9) R i λ (10) This form of the lidar equation appears in e\/ery handbook of lidar techniques for the LPA method with a reflecting target, that is for non-range-resolved methods. In the LPA method without a reflecting target, radiation is received that has been emitted by a laser, has traveled through the atmosphere to a particular range cell, has been reflected there by the air-aerosol mixture, and has returned to the detector.

The functional relationship must, of course, be known whether from theory, ground or laboratory measurements. In general however, even in the monochromatic case, the radiation field is influenced by not just one, but several substances. For instance, in the solar spectral region, the radiation which is reflected at the earth's surface is thus imprinted with a signature and this signature is influenced by the gases 28 and particles in the atmosphere. Another example is the absorption by different gases at the same wavelength.

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