SU568034A1 - Photoelectric autocollimator - Google Patents

Description

(54) PHOTO-ELECTRIC AUTO-COLLIMATOR

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The invention relates to optical devices and can be used to measure the right angles of triple prisms.

A photoelectric autocollimator is known, which contains a polarized SOURCE, a reflector, a modulator, a brand, a control unit and a photodetector with an indicator l.

However, it does not allow measuring the right angles of the triple prism with high accuracy,

The proposed autocollimator differs from the known one in that a diaphragm with two diameters but opposite sectors with a 60 ° opening angle, covered polarizers with mutually perpendicular polarization planes, one of which is parallel to the polarization plane of the radiation source and perpendicular to the bounding sec tor, is installed in front of the lens. the radius parallel to the edge of the straight triangle angle of the triple prism, set up with the possibility of rotation around the optical axis of the lens by 6 ° in the holder, is connected ohm via a control unit with an indicator.

FIG. 1 is a schematic diagram of an autocollimator | figs, 2 and 3 diaphragms; in fig. 4 is a diagram of the overlapping of the triple prism with light beams.

The autocollimator (FIG. 1) contains a polarized radiation source (not shown), a lens I, in front of which a triple prism 2 is installed, is controlled in a holder (not shown) connected via a control unit 3 with a photodetector and an indicator 4 .

Claims (2)

In front of lens 1, a diaphragm 5 is installed, the apertures of which have the form of diametrically opposite sectors 6 and 7 with an opening angle of 6 °, limited on one side by radii 8 and 9, and covered by polarizers 10 and 11 (Fig. 3) with mutually perpendicular planes polarization One plane of polarization is parallel to the plane of polarization of the radiation source and perpendicular to the radius 8 of sector 6 (FIG. 2). This radius is parallel to the edge 12 (Fig. 4) of the triple prism in its initial position. The autocator works as follows. The parallel polarized luminous flux, Bumeflmiffl from lens 1, falls only on part 13 (Fig. 4) of the face 14 of the prisms being operated 2. Face 15 is completely covered by a diaphragm 5. Faces 14 and 16 are partially covered by a diaphragm 2, and on part 17 of face 16, the light is completely suppressed by the polarizer 11 (Fig. 3), since its plane of polarization is perpendicular to the plane of polarization of the radiator. The entire luminous flux of part 13 of face 14 has the same order of passage of rays in prism 2, namely, having reflected from it, hits the face 15 and, having reflected from it, falls on part 17 of face 16. Having reflected from it, having turned to The 9O ° plane of polarization, the light completely passes through the polarizer 11 and enters the lens 1 of the autocollimator, processing only one autorum in the analysis plane: a perimetric image, the deviation of which can be measured with an accuracy of the order of successively turning the measured prism through 60 ° obtain the coordinates of six autocollimating images, by which one can unambiguously judge the magnitude and sign of errors made by the three right angles of the triple prism. Errors of installation of the measured prism practically do not affect the measurement results and can exceed by 3-4 times the measurement error. Thus, in the described autocollimator, six autocollimation images of the slit (brand) are superimposed on each other, which makes it possible to carry out measurements AND provided that the deviation of the controlled angles of the prism from the direct less angular slit size. A photoelectric autocollimator containing a polarized radiation source, a lens, a reflector, a modulator, a brand, a control unit and a photodetector with an indicator, characterized in that, in order to improve the accuracy of measurement of a direct telescope that serves as a reflector, before the lens , a diaphragm was installed with two diametrically opposite sectors with the opening angle of the BO, covered by polarizers with mutually perpendicular polarization planes, one of which is parallel to the polarization plane uu radiation source and perpendicular to the bounding .radiusu sector parallel to the forward edge of the dihedral angle triple prism mounted rotatably about the optical axis of the lens in the holder to 6D, communication-bonded via a control unit with an indicator. Sources of information taken into account in the examination: 1. US patent number 3031919, CP. 356-115, 05.17.62. Vui g P fPug.S fPui.t