This paper presents the measurement of optical absorption spectrum for different concentrations of ethanol at measured using portable spectroscopy setup from Avantes. ItHalogen light source and spectrometer. The light source can deliver a continuous broad spectrum ranging from 0.2 to 2.5 µm and the spectrometer has the detection range of µm. Several mixtures of ethanol in de concentrations of 0%, 0.1%, 0.5%, 1.0%, 2.5%, 5%, 10%, 15%, 25%, 50% and 100 vol%.The baseline of the absorption spectrum was being analyzed and corrected using MATLAB software. From the results, the spectroscopy setup was successfully detecting ethano concentration from 2.5-100vol%. However, only concentration range from 2.5 shown 99% of fulfilment towards the Beer's Lambert Law. Halogen light source and spectrometer. The light source can deliver a continuous broad spectrum ranging from 0.2 to 2.5 µm and the spectrometer has the detection range of µm. Several mixtures of ethanol in de-ionized water were prepared with vario concentrations of 0%, 0.1%, 0.5%, 1.0%, 2.5%, 5%, 10%, 15%, 25%, 50% and 100 vol%.he baseline of the absorption spectrum was being analyzed and corrected using MATLAB Halogen light source and spectrometer. The light source can deliver a continuous broad spectrum ranging from 0.2 to 2.5 µm and the spectrometer has the detection range of 0.2-1.1 ionized water were prepared with various concentrations of 0%, 0.1%, 0.5%, 1.0%, 2.5%, 5%, 10%, 15%, 25%, 50% and 100 vol%.he baseline of the absorption spectrum was being analyzed and corrected using MATLAB software. From the results, the spectroscopy setup was successfully detecting ethanol 100vol%. However, only concentration range from 2.5-50vol% has ultraviolet wavelength; spectroscopy; optical absorption; ethanol concentration;Research Article Special Issue M. K. A. Rahman et al.
