SPECTROGRAPH Russian patent published in 2008 - IPC G01J3/18 

FIELD: optics.

SUBSTANCE: spectrograph contains optically tied an entrance slit, a concave spherical diffraction grating with curvilinear unequally spaced fingers and a registering device with a flat receiving surface; at that an optical component is located in front of the said surface and is made as a mono block out of optically transparent material in such a way, that the diffraction grating, the registering device and the entrance slit are located on the surface of the mono block. The entrance slit is located on a plane, while the diffraction grating and the registering device are correspondingly located on spherical surfaces with curvature radii r and R, where r is the radius of the grating curvature and R=(0.8÷1.2r).

EFFECT: simplification of the design at upgraded quality of a spectral representation and extension of a wave lengths working range.

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