Low Cost Optical-electronic Sensor Development Based on Raman Spectroscopy for Liquid

Abstract

Spectroscopy is a method that used to identify chemical structure of substances using its spectral pattern characteristics. Optical spectroscopy term can be applied to any kind of optical photon interactions with matter. Raman spectroscopy essentially shows spectral response like the wavelength of scattered light is shifted regarding initializing excitation wavelength. In this paper, we propose a design of low cost optical-electronic sensor based on Raman spectroscopy. This low cost optical-electronic sensor employs a violet-blue 405 nm wavelength laser diode, a biconvex lens with 5 cm diameter and focus point, a test tube, and a Complementary Metal Oxide Semiconductor (CMOS) sensor. We tested this low cost opticalelectronic sensor based on Raman spectroscopy in dark condition. Combination of these hardware and components can provide measurement result to any liquid sample. From this experiment, even all liquid samples that used to test this combination of hardware and components are transparent, they still have different Raman spectra. This combination of hardware and components can be implemented into some application for instance body liquid measurement such as blood. In specific application, we need to employ data analysis and a bunch of data set which are organized into three different group such as training data, validation data, and test data group, combined with this developed instrumentation.