Energetic concept in the theory of laser sounding

The analysis of limits of accuracy of measurements with the help of laser sounding should take into account the known division of non-stationary processes into two classes according to attributes, essential for the correlation-spectral analysis. A mathematically strict and physically reasonable treatment of this problem gives the energy theory of stochastic signals (ETSS), making a mathematical basis for a wide class of modern algorithms of calculation for the characteristics of processes and systems. As the interaction of light with a substance has an essentially random or stochastic character, at any registration inevitable fluctuations exist, caused by the fact that light can absorb only by small discreet portions of energy or quanta. The half-classical approach gives in a maximum degree, physically clear and mathematically, the constructive description of interaction of light with a substance using a probabilistic model of a signal.