Speckle-Noise Computing by Two-Parameter Analysis of the Reflected Light's Periodic Variations

摘要

The paper presents the original method of calculating the speckle-noise that appear in the light wave reflected from the electro-optical medium that periodically modulates the wave. It has been shown that the problem is mathematically described by the Rice statistical model. The calculation of the noise component at processing the periodic electro-optical modulation of the reflected light is implemented by means of the so-called two-parameter method of moments, namely-by processing the data for the second and the fourth moments of the signal to be measured. As a result both the useful signal and the noise dispersion are being jointly estimated. The estimation of the speckle-noise value in the reflected periodically modulated light allows increasing the accuracy of the medium's electro-optical coefficients' determination if compared with the traditional techniques. The dependence of the estimations' precision on the sample length has been studied.