SU974116A1 - Device for measuring zone abberation value of article parabolid concave surfaces - Google Patents

Description

The invention relates to a measuring technique, in particular to devices for measuring; a profile of parabbloid concave surfaces, and can be used to measure the magnitudes of the zonal aberrations of the longitudinal and angular parabolic reflectors and lenses.

A device for controlling the shape of a parabolic surface is known. products containing a consistently installed light source, a pentaprise, which are movable and installed fi symmetric zones of the test surface, an optical measuring system, a mirror plastic of the plastic that is placed between the pentaprisms and installed when tested parallel to the optical axis of the test surface C 3

The closest to the invention in terms of technical origin is a device for measuring the magnitude of the zonal aberraic of paraboloid concave surfaces of products containing a sequential source of a parallel light beam, a diaphragm, a pentaprism made with the possibility of peremegae along a parallel light beam, a measuring node in the form of a screen or photographic plate and a device for mounting and prying a controlled item f2J.

The common drawbacks of the known devices are low measurement accuracy when monitoring short-lumped paraboloids.

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The purpose of the invention is to improve the measurement accuracy.

This goal is achieved by the fact that in a known device for measuring the magnitude of the zonal aberrations of pa15 of the spider-shaped hollow surfaces of products containing a sequentially located source of a parallel light beam of rays, a diaphragm, penTanpH3Nv, configured to

20 of re-megapency along a parallel light beam, and the receiving measuring unit, as well as the device for installing and adjusting the monitored product, the receiving measuring unit 25 is made in the form of a flexible fiber-optic element, the receiving end of which is marked with a cross and the device is equipped with a rotary Frame, the axis of which is lies in

Claims (3)

30 plane of the receiving end, and the mechanism located between the pentaprism and the rotary frame and the movement of the pentaprism with the turn of the rotary frame. In addition, in order to increase the measurement sensitivity, the device is equipped with a reading microscope, the object plane of which coincides with the output end of the flexible fiber optic element. And with the goal of increasing sensitivity and measuring performance, the device is equipped with a projection lens and a video monitoring unit located behind the output end of a flexible fiber-optic element; a grid with divisions is applied to the screen of the video monitoring unit. Jepter shows a schematic diagram of a device for measuring the magnitude of zonal aberrations of parabolic concave surfaces of products. The device contains successively located source 1 of a parallel beam of light, for example, a collimator or an optical quantum generator t OKG. diaphragm 2, pentaprism 3, made with the possibility of reciprocating movement along a parallel light beam, and receiving measuring unit 4, made in the form of a flexible fiber-optic element (VOE), on the central zone of the receiving end of which a cross 5 is applied, swivel frame b, a reading microscope 7 or a video monitoring unit 8 and a projection lens 9. The movable end of the VOE is fixed on the rotating frame b in such a way that the plane of its receiving end is aligned with the axis of rotation of the PIVOT, frame 6. Pentaprism 3 is connected through mechanism 10, for example a cam, with a swivel frame 6 An angle V of rotation of the swivel frame 6 VOE. and coordination. In the movement of penta prism 3, they are interconnected by the relation yi V tg-, where P is the parameter of the forming parabola of the controlled product of the reflector (where i is the focal distance in mm). The device also includes a device 11 for installation and adjustment of the controlled product 12. The device works as follows. The controlled article 12 is installed on the device 11 for installation and alignment of the controlled article so that the light spot reflected from the marginal controlled zone is located in the central zone of the receiving end of the VOE. A parallel beam of rays from a source 1 of a parallel beam of light, a collimator or a laser enters the diaphragm 2, cutting off parasitic glare and forming a narrow beam of rays by means of the pentaprism 3 and is reflected from it, falls on the receiving end. VOE. Moving the pentaprism 3 along the coordinate U of the controlled article 12, observe the position of the reflected light of the dot spot relative to the cross 5 of the receiving end of the VOE at the output stationary end of the VOE, for example, using a readout microscope 7. The reading grid is not shown in the reading microscope 7 with a known dividing price to determine the amount of deviation of the position of the spot light relative to the cross 5 of the VOE receiving end for various areas of the test item 12. To reduce the measurement time, to increase the sensitivity The video monitoring unit 8 and the projection lens 9, the image of the light of the spot and the cross 5 of the receiving end of the VOE in the plane of the image receiver of the video control unit 8. The position of the light spot relative to the cross 5 is evaluated on a grid with divisions (not shown in the drawing superimposed on the screen of the video monitoring unit 8. The desired focal distance of the controlled area of products 12 with a coordinate Y is determined by the formula iiM larttg- Tr where f is the calculated focal distance of the test article 12 and a is a grid reading of the position of the light spot relative to the center of the receiving end of the FDDER 1. Claim 1. A device for measuring the magnitude of the zonal aberrations of the parabolic concave surfaces of the article This, containing its sequentially located source of a parallel beam of light, a diaphragm, a pentaprism, which can be moved along a parallel light beam, and a receiving measuring unit, as well as a device for installing and adjusting the test article, characterized in that, in order to improve the accuracy of measurement , the receiving measuring unit is made in the form of a flexible fiber optic power supply, and the ment, to the receiving Topet. which has a cross, and the device is equipped with a rotating frame, whose axis lies in the plane of the receiving end, and a mechanism located between the penta prism and the rotary frame and according1, the pentaprism is overlaid with the turn of the rotary frame. 2. Device by. Claim 1, characterized in that, in order to increase the sensitivity of the measurement, it is equipped with an countable microscope, the object plane of which coincides with the output end of the flexible optical fiber element. 3. Device by. Clause 1, I distinguish from the fact that, with the aim sensitivity and performance (performance and: measurement, it is equipped with a project. ion lens and video control unit, located at the output end of the flexible fiber-optic element, on the screen of the video control unit there is a grid with divisions. Sources of information taken into consideration in the examination 1. The USSR Certificate of the USSR № 450077, cl. G 01 B 11/24, 1972. 2. Leonov B.G. Aberrograph of new design. Collection of materials of the All-Union Scientific and Technical Session on lighting. M., Gosenergoizdat, 1948, p. 10 (prototype). T /