optical filter

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optical filter
Posting date : Aug 09, 2008
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90-
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Interference Filter An Interference Filter reflects one or more spectral bands or lines and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest. It consists of multiple thin layers of dielectric material having different refractive indices. There also may be metallic layers. Applications: Laser Systems Analytical Measurements Imaging Optics Systems Safety and Monitor Systems Neutral Density Filter Neutral Density Filter reduces the brightness of an image without changing the color of the scene. It allows all wavelengths to pass through equally. Neutral density filters are categorized by their optical density (D) which is defined as the logarithm to the base 10 of the reciprocal of the transmittance (T): T=10-D Application: Imaging Systems Measuring Instruments

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