The Frequency Dependence of the Temperature Microstructure and Its Effect on Forward Scattering of Underwater Sound

In this paper, the effect of the transmission frequency'on the product of the spatial correlation distance and the mean-square fluctuation of the refractive index of the medium is examined.The investigation is limited to the interference region of propagation in which the RMS amplitude fluctuation of the forward scattered sound increases with the-square root of the transmission value can be related to the minimum patch siz It is shown from both a theoretical basis and from some experimental results, that the spatial correlation distance decreases with increasing frequency at a constant range.However, e_of a thermal l a limiting value of approximately l'cm is reached and this particular inhomogeneity in the ocean. Interference ScatteringAcoustic wave propagation in an inhomogeneous medium such as the ocean can be divided into two broad areasthe focussing region as described by Bergmann described by Mintzer [2].the meanrsquare amplitude fluctuation of the forward-scattered sound increases in proportion to an"increase in the transmission MICR '