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Description
We present an experimental study of two coupled Duffing oscillators in which intermittent chaotic synchronization emerges when sweeping the excitation parameters of the second oscillator, while keeping (F₁, Ω₁) fixed and varying (F₂, Ω₂). We employ three complementary tools: (i) a direct comparison of x₁(t), x₂(t), and the synchronization error e(t), aligned using an optimal time delay τ*, to identify on–off synchronization windows; (ii) the relative phase Δθ(t), obtained through the Hilbert transform, together with the phase-locking index R; and (iii) an analysis of the synchronization probability. We observe an error floor that increases with the parameter mismatches (ΔF, ΔΩ), together with the coexistence of phase synchronization. In addition, the durations of the laminar phases exhibit power-law tails, consistent with the characteristic behavior of on–off intermittency.
