SU1185113A1 - Opical system for spectral device - Google Patents

Abstract

OPTICAL SYSTEM of the SPECTRAL DEVICE, containing the illumination system located along the beam, the entrance slit, the collimator lens made in the form of a concave spherical mirror, the dispersing element made in the form of a flat diffraction grating and combined with the aperture diaphragm, the camera lens made in the form of a concave shaped crown. device to compensate for the curvature of the field, made in the form of a convex-flat lens, as well as a corrective meniscus and a flat swivel mirror, that, in order to increase the spatial and spectral resolution, the centers of curvature of the mirrors of the lighting system are aligned with the centers of curvature of the mirrors of the collimator and camera lenses, as well as the spherical surfaces of the corrective meniscus i and are located in the center of the aperture of the diaphragm, with the entrance slit (L made mirror, corrective meniscus placed between the lens of the collimator and the dispersing element or dispersing element and the camera lens, and the lens to compensate for the curvature is complete in the form of bilin Part 00 of which is made of materials SP with different spectral and transmittance coefficients and the same refractive indices, the plane of connection of the porOE parts parallel to the entrance slit of the optical system and perpendicular to the plane of dispersion of the diffraction grating.

Description

FIELD: optics. spectral instrument making.

The aim of the invention is to improve the quality of spatial and spectral information by increasing the spatial and spectral resolution.

Figure 1 shows the optical system of a spectral instrument; 2 and 3 illustrate the structure of the device for compensating the curvature of the field.

The optical system of the spectral device consists of a lighting system located along the beam, containing a convex spherical mirror 1 and a concave spherical mirror 2 with a hole, an entrance slit, filled in the form of a flat mirror 3, a lens of a collimator, filled in the form of a concave spherical mirror 4, dispersing element 5 a corrective meniscus 6, flat with a central hole of the mirror 7, a concave spherical mirror 8 of the camera lens, a device 9 for compensating the curvature of the field, a photodetector 10. At the same time the cops are arranged so that the centers of curvature of the mirrors of the illumination system are aligned with the centers of curvature of the mirrors of the collimator lens and camera and correcting the meniscus surfaces, and the aperture, which rim serves as a dispersing member disposed in the common center of curvature.

The device for curvature compensation is made in the form of a bilinza and consists of a half-lens 11, for example, from the material LS-10 and a half-lens 12, for example, from the material OS-14. Half lenses are made with the same radius of curvature, the value of which is determined by the value of curvature

floor, I rub the need to fix it. The half lenses are mounted flat on the photodetector.

The optical system of the spectral instrument operates as follows.

Radiation from an object through a hole in mirror 2 hits a convex mirror 1 and, reflected from a concave mirror 2, collects in the plane of the entrance mirror slit 3 of the spectral part, on which a virtually aberrationless intermediate image of the object is formed (there is only a curvature of the field that is corrected by a subsequent concave mirror collimator 40, reflected from the mirror slit J, the radiation enters the concave mirror 4 (collimator lens), the focus of which is slit 3, resulting in a dispersing lement actually misses aberrationless beam, the remaining spherical aberration Corrected which is concentric corrective meniscus, which may be located either before (6) of the dispersing element, and after it (6) in. depending on the design requirements

After the dispersing element and the meniscus, the radiation decomposed into monochromatic components falls on a flat swiveling mirror 7, reflecting on which goes on a concave spherical mirror 8 (camera lens), and then through an opening in the central part of the flat mirror 7 falls on a device for compensating the curvature of the floor 9 and photodetector 10.

A device for compensating the curvature of the field corrects the curvature of the field and eliminates the interfering radiation of the higher orders of the spectrum, the diffraction grating. not f

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Claims (1)

OPTICAL SYSTEM OF THE SPECTRAL INSTRUMENT, containing a lighting system located along the beam, an entrance slit, a collimator lens made in the form of a concave spherical mirror, a dispersing element made in the form of a flat diffraction grating and combined with an aperture diaphragm, a camera lens made in the form of a concave spherical , a device for compensating the curvature of the field, made in the form of a convex-flat lens, as well as a corrective meniscus and a flat rotary mirror, characterized in that, with In order to increase the spatial and spectral resolution, the centers of curvature of the mirrors of the lighting system are aligned with the centers of curvature of the mirrors of the lenses of the collimator and the camera, as well as the spherical surfaces of the corrective meniscus and are located in the center of the aperture diaphragm, and the entrance slit is made of a mirror, corrective meniscus placed between the collimator lens and the dispersing element or a dispersing element and a camera lens, and the lens to compensate for the curvature of the field is made in the form of a biline lens, part of which otovleny of materials with different spectral transmittances and the same refractive index, the compounds of the plane parts parallel to the entrance slit of an optical system and is perpendicular to the plane of the grating dispersion. SU ,,, 1185113