SU629521A1

SU629521A1 - Spectrograph objective lens

Info

Publication number: SU629521A1
Application number: SU64934083A
Authority: SU
Inventors: Михаил Владимирович Лобачев; Сара Самуиловна Аксельрод
Original assignee: Ленинградское оптико-механическое объединение им.В.И.Ленина
Priority date: 1964-12-16
Filing date: 1964-12-16
Publication date: 1978-10-25

Description

II

Изобретение относ1тс к оптическому приборостроению и может быть использовано в спектральных камерах.The invention relates to optical instrumentation and can be used in spectral cameras.

Известны различные линзовые и зеркально-линзовые объективы, примен емые в спектрографах ll . Они не обеспечивают получение пЛоского пол зрени при больших относительных отверсти х в случ&е использовани : дифракционной решетки в качестве диспергирующего элемента.Various lens and mirror-lens lenses are used in spectrographs ll. They do not provide a flat field of view with large relative apertures in case of & e use: a diffraction grating as a dispersing element.

Наиболее близким по технической сущности вл етс объектив спектрографа, содержащий зеркальную собирающую систему и диспергирующий элемент 2 .The closest in technical essence is a spectrograph lens containing a mirror collecting system and a dispersing element 2.

Известный объектив, используемый в спектрографе СТЭ-1, не обеспечивает получение большого пол зрени и относительного отверсти при плоском поле и требует применени дополнительного плоского зеркала, внос щего астигматизм, и допопнитепьного элемента дп компенсации астигматизма.The known lens used in the STE-1 spectrograph does not provide a large field of view and relative aperture in a flat field and requires the use of an additional flat mirror contributing astigmatism and an additional element dp of astigmatism compensation.

Цель изобретени - увеличение пол зрени , относительног-о отверсти и получение плоского пол .The purpose of the invention is to increase the field of vision, the relative aperture and the production of a flat floor.

Это достигаетс благодар тому, что зеркальна система вьтолнена в виде двух асферических зеркал, первого - выпуклого , второго вогнутого, имеющих равную по абсолютной величине силу, составл ющую /О,ё силы всего объектива и расположенных на двойном фокусном рассто нии один от другого, причем квадрат эксцентриситета первого зеркала составл ет - 5,82859, а квадрат эксцентриситета второго 2. -0,171572, при этом диспергирующий элемент расположен вне оптической оси.This is achieved due to the fact that the mirror system is made in the form of two aspherical mirrors, the first is convex, the second is concave, having an equal in magnitude force, the component / О, ё of the whole lens and located on the double focal distance one from another, the square of the eccentricity of the first mirror is 5,82859, and the square of the eccentricity of the second is 2. -0.171572, while the dispersing element is located outside the optical axis.

На чертеже изображена оптическа схема объектива в сечении по высоте щели, со зрачком, смещенным с оптической оси.The drawing shows the optical scheme of the lens in cross-section along the height of the slit, with the pupil offset from the optical axis.

Claims

The lens consists of spherical mirrors 5 and 3. The dispersing element is located in the entrance pupil and is made in the form of a diffraction grid, which spreads the light into the spectrum. The light coming from the diffraction grating, displaced from the optical axis by an amount p and turned at an angle в (в corresponds to the lower 6th point of the input image, sheli), hits the mirrors S n $ focusig / fes in the focal plane at a distance L from optical axis of the lens. 2 t corresponds to the image size of the spectrograph input beam. Beam 1-1 corresponds to the beam giving an image of the lower point of the entrance slit, and beam 2-2 corresponds to the upper point of the entrance slit; + rnj-rn - height of the pupil in height. Thus, in the focal plane of the lens, an image of spectral lines-spectrum is obtained. The scheme, which is mirror-like and has a large aperture, gives a significant economic effect, since its aberrations do not depend on the wavelength; in addition, the focal plane is beyond the light beam, which eliminates vignetting. All this allows to obtain a sufficiently high image quality, the proposed lens can work in any part of the spectrum. from ultraviolet to infrared. Claim 1. Investigator lens containing a mirror collecting system and

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5g 1 dispersing element, which means that, in order to increase the field of view I of the relative aperture and to obtain a flat floor, the mirror system is made in the form of two aspherical mirrors, the first is convex, the second is concave, Equally large in magnitude, the force is V 0.5 of the power of the entire lens and located at double focal distance one from another, with the square of the eccentricity of the first mirror being t. 5,82859, and the square of the eccentricity of the second f- 0,171572. 2. The spectrograph lens according to claim 1, characterized by the fact that, in order to reduce the size of the mirrors and obtain an uninvited field of vision, the dispersing element is located outside the optical axis. Sources of information taken into account in the examination: 1.Shishlovsky A. A. Applied Physical Optics. M., GIFML, 1961, p. 120.

2. USSR author's certificate number 138392, cl. Q 01 J 3/22, 1960