The methodology for conversion of transient current data in the time domain into dielectric loss data in the frequency domain using the Brather approximation is described. A test of the accuracy of the approximation is made using the 'stretched exponential' relaxation function (Kohlrausch-Williams-Watts function) for which the Fourier transform has been previously tabulated for a range of exponent fl(0 < ]7 ~< 1 ). As an example of the application of the Brather approximation we report ultra-low frequency dielectric loss data (10-3.5 to 10-0.4) for a liquid-crystalline side-chain polymer as derived from transient current data.
Посилання на статтю:
A consideration of the accuracy and application of the Brather approximation for the transformation of dielectric relaxation data from the time domain to the frequency domain / George P. Simon and Graham Williams // Polymer. – 1993. – Vol 34. – P. 2038-2044.