A white light, i.e., Fabry-Perot, interferometry was utilized for the first time to determine the rate change of the current density (J) of aluminum samples during the anodization processes of the samples in aqueous solutions. In fact, because the current density(J) values in this investigation were obtained by Fabry-Perot interferometry, an electromagnetic method rather than the electronic, i.e., direct current (DC) or alternating current (AC), methods. the abrupt rate change of the J was called Electrochemical-emission spectroscopy. The anodization process of the aluminum samples was carried out by the DC method in different sulphuric acid concentrations (0.0,2,4,6,8,10% H2SO4) at room temperature. In the meantime, the Fabry-Perot interferometry was used to determine the difference between the J of two subsequent values, dJ, as a function of the elapsed time of the DC experiment for the aluminum samples in 0.0,2,4,6,8,10% H2SO4 solutions. The Fabry-Perot interferometry was based on a fiber-optics sensor in order to make real time-white light interferometry possible at the aluminum surfaces in the sulphuric acid solutions.  The electrochemical-emission spectra of the present investigation represent a detailed picture of not only the rate change of the current density throughout the anodisation processes but also the spectra represent the rate change of the growth of the oxide films on the aluminum samples in different solutions. As a result, a new spectrometer was developed based on the combination of the Fabry-Perot, i.e., white light, interferometry and DC method for studying in situ the electrochemical behavior of metals in aqueous solutions.