SU1425437A1 - Interferometer for checking convex paraboloids - Google Patents

Abstract

The invention relates to a measurement technique and can be used for the technological and certification control of convex paraboloids in optical instrumentation. The purpose of the invention is to expand the range of controllable and x surfaces, to increase the accuracy and productivity of control due to the fact that the optical system allows to send a light beam reflected by all zones to the working branch of the interferometer.

Description

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controlled surface. Thus, the control of convex parabolos with the central working area becomes possible to carry out at one time, eliminating the additional and less accurate operation of controlling the centronal zone with the help of test glass. The interferometer contains a source of 1: monochromatic radiation and a focusing optical system 2, aperture 3, a lens 4, a beam splitter 5, a double flat mirror 6, a second beam splitter 10, an input lens 9 of an interference pattern recording system, a screen 11, and an locus a system consisting of lens components 7 and 8. 1 Il.

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The invention relates to a measuring technique and can be used for technological and attestation (control control of convexes of paraboscopes in optical instrumentation.

The purpose of the invention is to expand the range of monitored surfaces, to increase accuracy and production, due to the fact that; the light beam of the working branch is directed to the controlled surface (with a pinz component of the afocal system; the focus of which is combined with the H oc surface). This allows you to fully illuminate the monitored surface and direct the parallel beam reflected by all the zones of the monitored surface to the working branch of the interferometer, which makes it possible to Control bulging Tsarabol Oids with non-working and working central zone, as well as due to the fact that the surface is controlled at one time, which eliminates the additional, less precise operation of controlling the central working zone with a spherical test glass.

The drawing shows the optical layout of the proposed interferometer.

An interferometer for monitoring convex paraboloids contains a source of monochromatic radiation and a focusing optical system 2, aperture 3, a lens 4, a beam splitter 5 for dividing the radiation into two branches - a reference and a working reference mirror, arranged in the reference branch and made in the form of a double mirror 6 consisting of

flat mirrors, located at an angle of 90 to each other, an optical system made of afocal and consisting of two polokitelnyh lens components 7 and 8, located on opposite sides of the light attenuator 5, is a system (not shown in the drawing) of registration of an interference channel: rotary, comprising an input lens 9,

second beam splitter 10, screen 11.

The interferometer works as follows.

The light from the monochromatic radiation source 1 by the focusing optical system 2 is directed to the diaphragm 3 installed at the focus of the lens 4. The parallel beam formed by the lens 4 by means of the splitter 5 is divided by

supporting and working branches. A parallel beam of the support branch, reflected by a double mirror 6, with the help of the second beam splitter. 10 is guided into an input lens 9 of an interference pattern recording system. The parallel beam of the working branch passes the lens component 7 and is directed to the test piece 12 with a convex parabolic surface. The focus of the parabolic surface is aligned with the focus F of the lens component 7, and the optical axis of the parabolic surface is aligned with the optical axis of the afocal system.

A parallel beam reflected from a parabolic surface passes the afocal system and, after passing through the beam splitter 10, it enters the input lens 9. Interference pattern resulting from the interaction of the working and reference beams

see directly with the eye from the focus Fj or on the screen 11.

Claims (1)

Invention Formula An interferometer for controlling convex paraboloids containing a source of monochromatic radiation and a focusing optical system, a diaphragm, a lens arranged so that its focus is aligned with the diaphragm, and the first beam splitter for dividing the radiation into two branches — a controversial and an operating one — a reference mirror located in the reference branch, an optical system located in the working branch, and an interference pattern recording system including an input lens that differs eat that expanding the range of monitored surfaces, increasing the accuracy and productivity of control, it is equipped with a second beam splitter installed between the optical system of the parcel branch and the input lens parallel to the first beam splitter; the optical system of the working branch is made afocal, consists of two positive lens components along the different sides of the first beam splitter j and installed so that the optical axis of the system is aligned with the optical axis of the input lens, and this mirror is made in the form of a double mirror consisting of flat mirrors at an angle of 90 ° to each other, and installed so that the optical axis of the reference branch is aligned with the optical axis of the input lens.