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nature : the most simple form of a wavelength selector, the filter characteristics can filter center wavelength, and the band-width of the largest transmission to other physical characterization. According to the different structure can be divided into glass filter, the film filter; According to the principle of different filter, the filter can be divided into absorption, interference filter; According to the different uses can be divided into correction filter, the standard filter, neutral density filter. For chromometer simple and visible spectrometer. The fluorescence meter specialized selected filter, is very narrow band of radiation, and the fluorescence wavelength separation. It sheet glass plate form of translucent materials for the production of glass formulations to join non-ferrous metal oxides, such as rare earth oxides, wavelength selective availability. It will need to inhibit absorption of electromagnetic radiation through the narrow wavelength required. Under the wavelength region to be given a choice of transmission, it is a series of different wavelength filter. Its effective bandwidth of about 50 nm, the peak transmission of <20%.
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