ABSTRACT
In Raman spectroscopy, the sample is typically illuminated by a laser source in the visible, near-infrared (NIR), or near ultraviolet (UV) range to induce Raman scattering. The essential components of Raman spectroscopy systems include a monochromatic light source, wavelength separation device, and detector. Raman spectroscopy technique has witnessed rapid advancement in its application and measurement techniques. The conventional method of Raman spectroscopy widely used for many years has been backscattering Raman spectroscopy. Transmission Raman spectroscopy can measure attributes of a bulk quantity of a heterogeneous sample by placing the sample between the detector and incident laser. Spatially Offset Raman Spectroscopy is a relatively new method for retrieving internal information of layered samples. Analysis of Raman spectral data against chemical composition of samples can provide unique spectral fingerprints for identifying molecules. Qualitative analysis aims to identify chemical components based on Raman spectral characteristics of the components of interest, while quantitative analysis aims to evaluate the concentration of the components.
