SU693109A1 - Device for checking prism angle - Google Patents

Description

 , - I The invention relates to optical measuring instruments and can be used in. Optics and mechanical industry to control the angles of prisms, polyhedra, wedges. A device for measuring prism angles, consisting of two autocollimators, is known. and a polyhedron that allows one to control the angles of regular polyhedra by the absolute method 1. Measurement accuracy with the aid of a known device is limited by the need to take readings from two autolcollimators when aiming for the reference angle and the controlled angle. A device for controlling prism angles is also known, which contains a turntable for mounting a controlled prism on it, a collimator including an illuminator and a lens, a telescope including an eyepiece and a lens, mirrors and a lens compensator. The collimator and the telescope are mounted coaxially, and the system of mirrors is made in the form of a reference dihedral angle equal to the nominal value of the measured angle or supplementing it to 180 ° 2. The disadvantage of this device is a decrease in the measurement accuracy due to possible errors in the installation of controlled edges and reference edges. angles perpendicular to the angle measurement plane, a. also a limited range of measurable angles. It is practically possible to control angles of at least 45 ° and not more than 135 °. . Decreasing or increasing the angles beyond the specified limits requires spreading over large distances of the mirrors that form the reference angle, which leads to a decrease in the measurement accuracy. The purpose of the invention is to improve the measurement accuracy and expand the range of measured angles. For this, the proposed device is equipped with a beam splitter and an optical hinge, the eye piece and the illuminator are installed so that their optical axes intersect at a 90 ° angle and at the point of intersection there is a beam splitter, obezating two light beams, la two faces of the controlled prism, and in one An optical hinge is installed from the light fluxes.

FIG. 1 is given the scheme described fiber; in fig. 2 - the field of view of the device when combining images; in fig. 3 - the same, with the mutual displacement of images.

The device for controlling prism angles contains a radiation source 1, a condenser 2, a grid 3, lenses 4, 5, mirrors 6-10, a beam splitter 11, an Abbe prism 12, a compensator lens 13, 14, a grid 15, a lens 16 and a turntable 17 with axis 18 On the table 17 installed controlled prism 19.

The instrument's illuminator consists of a radiation source 1, a capacitor 2 and a grid 3, and an eyepiece from a grid 15 and a lens 16.

The optical axes of the illuminating and ocular parts intersect at an angle of 90 and at the intersection of the beam there is a beam splitter forming two light beams. In one of the light fluxes, two mutually perpendicular mirrors 6 and 7 are placed, an optical hinge consisting of a mirror 8 and a prism 12 Abbe, a lens 4, whose focal plane is aligned with the planes of grids 3 and 15. A node containing mirrors 6, 7 8 and lens 4 are kinematically connected with Abbe's prism 12 so that when it is rotated at a certain angle, the prism 12 rotates around m (the same axis at half the angle.

In another luminous flux, two mutually perpendicular mirrors 9 and 10, a lens compensator, which consists, for example, of a positive lens 14 and a negative lens 13, which form an afocal system, are also placed. Lens 13 is mounted for movement perpendicular to its optical axis and is equipped with a device for measuring the amount of movement (not shown). In the same stream there is an objective 5, the focal plane of which is combined with the planes of grids 3 and 15. Table 17 is equipped with adjusting screws, which allow changing the inclination of its plane relative to RS 18.

The source of 1 radiation through the condenser 2 illuminates the grid 3. A 1G divider that divides the beam of rays into two streams. In the stream of rays, the rays pass through the prism 12, are reflected by mirrors 8, 7, 6 and come out of the lens 4 by a parallel beam. Reflected from the face of a controlled 19, the rays return to the lens 4, reflect from mirrors 6, 7, 8, pass a prism 12 and a beam splitter 11 are directed to the lens 16, forming an image of the grid 3 in the plane of the grid 15.

In a different light flux, the rays pass through the lenses 14, 13 of the compensator, are reflected by mirrors 9,10 and come out of the lens 5

nym beam. Reflected from the face of the prism 19, the rays pass the lens 5, are reflected from the mirrors 10, 9, the compensator lenses 13, 14 pass, the beam splitter II, form

the image of the grid 3 in the plane of the grid 15 and further passes lnnau 16.

By tilting and rotating the table 17, as well as by rotating the node uniting the mirrors 6, 7, 8 and lens 4, the faces of the prism 19 are set perpendicular to the rays falling on them. Simultaneously (with the rotation of the mirrors 6, 7, 8 and the lens 4, the prism 12 rotates at half the angle, excluding the occurrence of image rotation.

Two autocollimation images are observed from the two faces of the prism 19 (the field of view is shown in Fig. 2 and Fig. 3). The illuminator grid is made in the form of a scale of parallel strokes located at equal distances from each other. The central bar 20 of the autocollimation image formed by the rays passing through the compensator is combined with the index 21 of the ocular grid. The second autocollimation image formed by the rays passing through the optical hinge is set below the first so that the two images touch each other. FIG. The 2 autocollimation images are arbitrarily separated by line 22.

For each prism, autocollimation images are combined nonionally, as shown in FIG. 2, by rotating the part of the instrument containing the optical joint. After replacing the reference prism with a controlled central stroke of the image formed by the branch with the compensator, the index of the ocular grid is again combined with the index. If there is a difference in the values of the controlled and reference angles, the autocollimation images in the field of view

will be mutually offset as shown in FIG. 3. The magnitude of the mutual displacement of images determines the deviation of the monitored angle from the reference angle. This deviation can be assessed by observables in the field of vision of the scale, or measured by a compensator.

Accuracy of measurements with the help of the proposed device is improved due to the use of non-co-mixing crystals and the construction of autocollimation

images by rays incident on the tested prisms perpendicular to their faces. The presence of a moving arm with an optical hinge provides a wide range of angle measurement.

Claims (2)

Invention Formula A device for monitoring prism angles containing a turntable 17 designed for mounting a controlled prism on it, a collimator including an illuminator and a lens, a telescope including an ocular and a lens; mirrors and a lens compensator with a reading device, characterized in that, in order to increase the measurement accuracy and expand the measurement range. The angle of the corners, it is equipped with a beam splitter and an optical joint, the eyepiece of the beam splitter is set so that their optical axes intersect at a 90 ° angle and at the point of intersection there is a beam splitter forming two light beams directed to two faces of the controlled prism, and one of the light streams installed optical joint. Sources of information taken into account in the examination}. Measuring equipment, No. 3, 1972, p. 6 2. USSR author's certificate N 197990, cl. G 01 B 9/10, 1966, (prototype). YU   - .-. ..;:., J09.-JvN. ..,  . / -. j | X- 1 . .: -.,