SU1226077A1 - Afocal slitless spectrograph - Google Patents

Abstract

The invention relates to optical, instrument making and can be used in telescopes for various purposes. The invention allows the registration of spectra of astronomical objects with increased sensitivity and greater efficiency due to the use of telescope photodetector equipment. An afracted gapless spectrograph contains a flat-concave negative lens 1, which converts the converging beam of the telescope into a parallel one. The parallel beam hits the transparent Phase diffraction grating 2. With the aid of grating 2, light is decomposed into a spectrum and focused by a convex lens 3 on a photoelectric analyzer 4. A spectrograph is a meniscus of zero optical power and does not distort the image of astronomical objects. Due to its local nature, it is not very sensitive to the accuracy of the installation. The plane of the spectra image is parallel to the focal plane of the telescope. 1 hp f-ly, 1 ill. S 1 g J to | S od O

Description

The invention relates to optical instrumentation and can be used in telescopes for various purposes.

The purpose of the invention is to improve the sensitivity and efficiency of spectral work.

The drawing shows a diagram of an afocal slitless spectrograph.

The afocal gapless spectrograph contains a flat-concave negative lens 1 of the collimator, a transparent phase diffraction grating 2, a positive convex positive lens 3 of the camera, a photoelectric analyzer 4, a recording unit 5.

To reduce the number of surfaces of the spectrograph, diffraction grating 2 can be applied to one of the flat surfaces of lenses 1 or 3.

The spectrograph works as follows.

A converging beam of light from a telescope lens (not shown) is converted by the lens 1 into a parallel one and illuminates the diffraction grating 2. The dispersed light after the grating is collected by the lens 3 in its focal plane in the form of spectra of all orders that are photoelectric analyzer 4 converted into electrical signals and recorded to the storage medium in block 5 registration. The image of the object in the zero order can serve as a frame for counting the wavelengths in the remaining orders.

The spectrograph is a zero-optical meniscus, which does not introduce noticeable distortions in the images of stars given by the telescope and is not very sensitive to the accuracy of the spectrograph's installation due to its locality and location near E.Papp editors 2111/29

Compiled by S.Ivanov Tehred I.Popovich

Corrector

Circulation 778 Subscription

VNISH1I USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and Printing Enterprise, Uzhgorod, st. Project, 4

telescope lens surface. Since the transparent phase grating does not cause the light passing through it, the yoke of the spectral images from the afocal gapless spectrograph remains parallel to the focal plane of the telescope. The transfer of the telescope to the spectral observation mode is carried out by simply introducing the spectrograph into the light beam, and switching to another dispersion by replacing the spectrograph.

Claims (2)

1.Afocal gapless spectrograph containing an optically coupled collimator lens, a dispersing element, a camera lens and a photoelectric analyzer, as well as a recording unit connected to the photoelectric analyzer output, characterized in that in order to increase the sensitivity and efficiency of the spectral work, the collimator lens is made in the form of a negative plane-bent lens, the dispersion element is in the form of a transparent phase diffraction grating, and the camera lens is in the form of a positive plane-convex lens, with a plane-bent lens in the collimator lens and a plane-convex lens The camera lens faces each other with flat surfaces, between which a dispersing element is mounted. 2. A spectrograph according to claim 1, characterized in that the transparent phase diffraction grating is deposited on the flat surface of the lens of a collimator or chamber objective. Proofreader O.Lugov