Patent ID: 6271917
Filing Date: 2001-08-07
Classification: G01J

Abstract:
A radiation spectrum analyzer comprising:at least one source providing radiation having at least one selected spectral component, said spectral component having an intensity, a center wavelength and a bandwidth;first optics collecting, dispersing and focusing said radiation to form an image dispersed by wavelength along a dispersion axis onto a plane;a two dimensional spatial radiation modulator rotated about a rotation axis and positioned in said plane so that said dispersion axis is substantially along a radial axis, said modulator having at least one radiation filter at a radius from said rotation axis, said filter having a radial width substantially defining the bandwidth of a corresponding spectral component of said radiation, said filter modulating the intensity of said corresponding spectral component substantially independent of said bandwidth to provide an encoded beam comprising at least one encoded component, wherein the amplitude of said encoded component changes between three or more substantially distinct levels of contrast as said modulator is rotated about said rotation axis;a detector;second optics collecting and directing said encoded beam onto said detector, causing the detector to provide an output; andcomputer analyzing signals generated by said detector in response to said encoded beam.