All-reflective UV-Vis-NIR Absorption Spectroscopy setup for micro-sized samples

Abstract

Absorption spectroscopy is the technique that measures the absorption of light incident on a material as a function of wavelength due to light-matter interactions. During the MS thesis, we set out to investigate whether a UV-Vis-NIR absorption spectroscopy setup can be built to analyse the samples in the range of a few micrometres. The setup was mesured for beam spot measurement for sample size to be less 20 micrometres. The setup uses all-reflective components in its design to minimise spectral losses. We demonstrate the capability of the setup using common spectrally active materials like red-dyed acrylic, gel ink and yellow volatile corrosion inhibitor (VCI) film. The performance is validated using a commercial UV-Vis-NIR absorption spectroscope.