AFOCAL SLOTLESS SPECTROGRAPH Russian patent published in 1994 - IPC

Abstract RU 2018791 C1

FIELD: optic instrument engineering. SUBSTANCE: afocal slotless spectrograph has a plane-concave negative lens for converting a convergent beam of telescope into a parallel one, diffraction grating, plane-convex lens, photoelectric analyzer, recording unit. The spectrograph furthermore is provided with a second transparent phase grating the use of which reduces the cost of a set of spectral devices required for observing variable-brightness objects and simplifies the construction of a spectral assembly. EFFECT: reduced cost, simplified construction. 1 dwg

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RU 2 018 791 C1

Authors

Bagrov A.V.

Smirnov M.A.

Dates

1994-08-30—Published

1990-09-25—Filed