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Monochromator

A monochromator is an optical instrument that is designed to separate polychromatic white light into monochromatic light. Monochromators function to isolate a selected wavelength of light from a source of illumination. The selected wavelength is used for analytical purposes such as analyzing the properties of a sample through which the light is passed. An optical monochromator selects separate spectral components from a broadband optical signal and enables the reliable registration of these separate components by means of a detector. Monochromators may also be used to recombine spectral components into a broadband signal. Monochromators generally comprise a light source, an entrance slit for receiving light to be analyzed, means for separating the light into its individual wavelengths and an exit slit for selecting a desired component. Light coming into a monochromator through the entrance slit is separated by the light separator into a series of component monochromatic lights, and an image of the entrance slit of every component monochromatic light is projected onto the exit slit plate. Thus a monochromated light of varying wavelength comes out of the exit slit while the monochromator scans through a preset range of wavelength.

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