DIGITAL MODELING OF THE OPERATION OF AN ACOUSTOOPTICAL SPECTRUM ANALYZER ON A BACKGROUND OF NORMAL NOISE.

Many theoretical papers have recently been published devoted to an investigation of the noise immunity of acoustooptical devices. Experimental research in this area can be carried out using digital modeling. We take as the initial acoustooptical device a spectrum analyzer of the dispersion-spatial type. The size of the aperture of the modulator is chosen to be such that the time T taken to fill it satisfies the quasi-harmonic condition TAU less than 1/ ROOT gamma //m, where lambda //m is the maximum rate of change of the frequency of the part of the signal being analyzed. In this case, the aperture under steady-state conditions is completely filled with the signal, which is a good approximation to a harmonic signal, with instantaneous values of the amplitude and frequency A//O and omega //O, respectively, and the analysis of a large class of signals reduces to discrete measurements of A//O and omega //O.