Package structure of double grating spectroscopic system with stable ability to eliminate stray light

Abstract

The packaging structure of the double grating spectroscopic system with stable stray light elimination ability belongs to the field of grating spectrometer technology. The reflection mirror, the ruled grating, and the fourth reflection mirror are respectively packaged in a broad-band rough absorption cavity, a wide-band fine absorption cavity, a narrow-band rough absorption cavity, and a narrow-band fine absorption cavity; the first parallel diaphragm is placed in a broad-band rough absorption cavity At the intersection of the cavity and the partition plate of the wide-band fine absorption cavity, the first converging diaphragm is placed at the intersection of the band fine absorption cavity and the narrow-band coarse absorption cavity separation plate, and the second parallel diaphragm is placed in the narrow-band rough absorption cavity At the intersection of the narrow-band fine absorption cavity partition plate, the second converging diaphragm is placed at the final exit of the light path of the narrow-band fine absorption cavity, and the extinction trap is installed on the primary and secondary scattering surfaces of the double-grating spectroscopic system; The inner surface of the cavity and the inner and outer surfaces of the matting trap are painted with black paint.

Description

technical field [0001] The invention relates to a package structure of a dual-grating light-splitting system with stable stray light elimination capability, and belongs to the technical field of grating light-splitting. Background technique [0002] With the rapid development of aerospace technology, the sensitivity of high-resolution monochromators and spectrometers has been greatly improved, and they put forward higher requirements for the stray light suppression level of the system. The harmfulness of stray light is to reduce the contrast of the image plane and the value of the modulation transfer function, the energy distribution is chaotic and even stray light spots are formed, which reduces the signal-to-noise ratio of the target signal and affects the measurement accuracy. [0003] Most of the existing high-precision monochromators are designed with a double-grating and four-mirror system. The theoretical spectral resolution of this structure is very high. The main so...

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Problems solved by technology

[0005] In order to solve the problem that the light extinction ability of the package structure of the existing grating spectrometer shell decreases greatly with the attenuation degree of the black paint absorptivity, the present invention provides a double grating spectroscopic system package structure with stable stray light extinction ability

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