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Noise driven electroconvection in sandwich cells of nematic liquid crystalsexhibits on-off intermittent behaviour at the onset of the instability. Westudy laser scattering of convection rolls to characterize the wavelengths andthe trajectories of the stochastic amplitudes of the intermittent structures.The pattern wavelengths and the statistics of these trajectories are inquantitative agreement with simulations of the linearized electrohydrodynamicequations. The fundamental $\tau^{-3/2}$ distribution law for the durations$\tau$ of laminar phases as well as the power law of the amplitude distributionof intermittent bursts are confirmed in the experiments. Power spectraldensities of the experimental and numerically simulated trajectories arediscussed.Comment: 20 pages and 17 figure

Fundamental scaling laws of on-off intermittency in a stochastically driven dissipative pattern-forming system