Experimental representation of phase portraits

The perpendicular slice through the phase portrait provides the stroboscopic phase portrait or Poincare section (e.g. [3]). This is in the case of the harmonic oscillator one point in the phase portrait. A further powerful method for the analysis of nonlinear dynamical systems is the determination of the Fourier spectrum of the response function 2. 

14 Chaotic Behavior near the Ferroelectric Phase Transition 

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