Fig. 7.

Comparison of Two Evaluation Methods of the Complex Modulus. The complex modulus was determined for the smooth intensity correlation function measured from a sample of collagen I solution (purple). Gaussian distributed noise was applied to a smooth intensity correlation function exported from the DLS (inset). The noise-modified intensity correlation function was evaluated using either the power-law method (blue) or the direct Laplace transform method (pink) of the mean-squared displacement. While the smooth intensity correlation function resulted in the same complex modulus using both methods, the noise introduced is handled better in the direct Laplace transform method over the interior frequencies. Opaque regions indicate one standard deviation from the mean, n = 3.