Publication Date : 01/08/2012

Author(s) :

Jibia, A.U..

Volume/Issue :
Volume 7
Issue 1
(08 - 2012)

Abstract :

The problem of estimating time constant of a sum of damped exponentials has been a major area of research in many fields in science and engineering. Several methods have been reported all of which can be grouped into time-domain and frequency-domain techniques. Time-domain analysis predated frequency domain analysis but the latter has taken the centre stage due to the ease with which signals can be analyzed in the frequency domain. Nonetheless, time-domain analysis is still widely used and time-domain methods are still being investigated and refined. This paper investigates time-domain approach to transient multiexponential data analysis. Although no claim is being made that time-domain methods are exhausted, it can be truly asserted that major methods of time-domain analysis are reviewed in this paper. The paper attempts to give a detailed summary of each method and shows its limitations. Of all time-domain methods, Prony has undergone the most modifications. However, a more recent method (METS) has been more successfully applied especially in Chemical Engineering. The peeling technique is obsolete and only significant because it serves as the basis for nonlinear least squares method. IMOM was applied only by its originator in Fluorescence decay analysis and its applicability in other areas has not been proven.

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