FIELD: physics, optics.
SUBSTANCE: invention relates to optical instrument-making and a device for spectral selection of optical radiation. The device consists of an input optical system and a Fabry-Perot interferometer lying along an optical axis. The input optical system enables to form a parallel beam path and the Fabry-Perot interferometer is configured to deviate the normal of the interferometer mirrors relative to the optical axis of the system. The deviation of the normal of the mirrors of the Fabry-Perot interferometer is provided by adapters or connecting elements which prevent external optical radiation from falling into the optical path.
EFFECT: high signal-to-background ratio when detecting weak radiation in considerable background noise conditions.
2 dwg
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