Optical system for spectral analysis devices

Claim 1

An optical system for spectral analysis devices comprising a dispersion member having a surface provided with a dispersing structure and a dispersion plane at right angles to said surface and to a principal direction of said dispersing structure, a concave collimating reflector having a first vertex and a first radius of curvature R, a concave camera reflector having a second vertex and a second radius of curvature R, said collimating reflector and said camera reflector being adjacently arranged remote and at the same distance from said dispersion member, said first and said second vertex being located in said dispersion plane, said first radius of curvature R and said second radius of curvature R being equal, an excitation light source for emitting a light beam along a first optical axis, said light source being arranged in the vicinity of said dispersion member on one side of said dispersion plane, said first optical axis connecting said light source and said first vertex, said collimating reflector being for producing a reflected beam from said light beam and directing the same to said dispersion member, said reflected beam and said light beam including a first angle θ and defining a first reflection plane, an aperture being arranged about said first optical axis adjacent said light source, said aperture comprising a horizontal slit and a vertical slit, said horizontal slit having a first distance r s to said collimating reflector, said vertical slit having a second distance r t to said collimating reflector, a focal plane on the side of said dispersion plane opposite said first side in the vicinity of said dispersion member, said focal plane having a center, said center and said aperture being substantially equidistantly positioned to said dispersion plane, a second optical axis connecting said center of said focal plane and said second vertex, said dispersion member being for producing a dispersed beam from said reflected beam and directing the dispersed beam to said camera reflector, said second optical axis and said dispersed beam including a second angle θ and defining a second reflection plane, said first and said second angle θ being equal, said first and said second reflection plane being substantially at right angles to said dispersion plane, said reflected beam, when impinging upon said dispersion member, producing a point of impingement, said reflected beam and a perpendicular line erected on said surface of said dispersion member at said point of impingement including an angle α, said dispersed beam and said perpendicular line including an angle β.