Luminous transmission
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1 DGV, Doppler Global Velocimetry or the photography of velocity by laser
With a computer and optic system based on two CCD cameras and a gas (iodine vapor), the absorption frequencies of which are close to that of the incident beam, we are able to associate the frequency shift Df with a variation of luminous transmission DT... One of the absorption lines of iodine, one" edge" of which serves to establish the relation between the frequency shift (f1- f0) and the corresponding difference in luminous transmission on the image (T1- T0)
