Diffusion measurements in heterogeneous media may contain a significant source of error,
the influence of the coupling between the applied and internal magnetic field gradients on
the attenuation of the NMR signal. The application of bipolar magnetic field gradients has
been introduced to suppress this error. The basic assumption for the successful removal of
the coupling is that the diffusing molecules are experiencing a constant internal gradient
during the experiment. We will provide theoretical and experimental evidence that the …