Abstract
A method is proposed for measurements of the second-order space-time correlation in the transmittance of a given fluctuating medium. Three kinds of light-beat photocurrent are produced by the use of some optical polarization components and two photodetectors. Correlational processing of these currents by an electronic correlator offers two correlation outputs in phase quadrature from which the correlation of concern can be constructed. The measurements of its modulus and phase are assured by simulation experiments using a thermally turbulent atmosphere in an optical heterodyne interferometer.
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