Abstract
This paper presents the measurement of optical absorption spectrum for differentconcentrations of ethanol at ultraviolet wavelength. Ethanol absorption spectrum wasmeasured using portable spectroscopy setup from Avantes. It consists of Balanced DeuteriumHalogen light source and spectrometer. The light source can deliver a continuous broadspectrum ranging from 0.2 to 2.5 μm and the spectrometer has the detection range ofμm. Several mixtures of ethanol in de-ionized water were prepared with variousconcentrations 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 MATLABsoftware. From the results, the spectroscopy setup was successfully detecting ethanolconcentration from 2.5-100vol%. However, only concentration range from 2.5-50vol% hasshown 99% of fulfilment towards the Beer’s Lambert Law.Keywords: ultraviolet wavelength; spectroscopy; optical absorption; ethanol absorption spectrum baseline; Beer's Lambert law
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