Instrumentation for Raman Spectroscopy:

There are two main issues in Raman spectroscopy that need to be addressed by suitable instrumentation. First one is the inherent weakness of the Raman scattering signal as compared to the intense Rayleigh scattering and the second is about the spectral resolution that is the ability to resolve features inside the spectrum. Like the IR instruments, there are five basic components of a Raman spectrometer. These are given below:

• An intense laser source
• Sample handling unit
• Monochromator or interferometer
• Detector
• Signal processing and output device

A schematic representation of the common set up of the monochromator based dispersion Raman spectrometer is given in Figure and that of the interferometer based FT-Raman spectrometer is given in Figure.

Figure: Schematic representation of the experimental set up of a dispersion Raman spectrometer

You  might  search  the  arrangements   to  be  same  to  that  of  the  corresponding   IR instruments  along with the only difference being that the scattered radiation is collected  at right  angles  to the  radiation  and  it  is  passed  by  a  filter  before  sending  to a transducer  for detection.  A Raman spectrometers  differ from the IR instruments  in terms  of  the  sources,  a  sample  handling  devices  and  the  transducers  used  for detecting the scattered radiation.