A spectroscopic instrument, or spectrometer, generally consists of entrance slit, collimator, a dispersive element such as a grating or prism, focusing optics, and a detector. Optical spectroscopy is a technique that is used to measure light intensity in the ultraviolet (UV), visible (VIS), near-infrared (NIR), and infrared (IR) range of the electromagnetic spectrum. Spectroscopic measurements are used in many different applications, such as color measurement. Wavelength selector is a component used to select and isolate the required wavelengths or range of wavelengths where the analyte is the only absorbing species (to obtain a certain wavelength or a narrow band of wavelengths). This understanding has led to a host of modern technologies utilizing light's wave properties to transmit information (audio and visual. Spectroscopy is a general methodology that can be adapted in many ways to extract the information you need (energies of electronic, vibrational, rotational states, structure and symmetry of molecules, dynamic information). Understand how light interacts with matter and how you can use this to. Sources of Energy 2.
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