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Spectrometer, also known as the spectrometer. Photomultiplier tube detector measures the light intensity of the spectral position of the wavelength of different devices. Constructed of an entrance slit, a dispersion system, an imaging system and one or more composition of the exit slit. The dispersive element to the electromagnetic radiation of the radiation source required for separating the wavelength or wavelength range, and the selected wavelength (or a scanning band) intensity was measured. Monochromator polychrometer into two.
