SU1244616A1 - Autocollimation device - Google Patents

Abstract

The invention relates to optical instrumentation and can be used in optical devices that simultaneously emit and receive radiation. The aim of the invention is to improve the pointing accuracy on the autocollimation image of the mark by obtaining a symmetrical image in the field of view. In the device between the radiation source 1 and the translucent mirror 3, additional plates 5, 6, 7 of optically transparent material are installed, introducing asymmetrical aberrations, due to which the image of a point source acquires an axisymmetric shape. To compensate for the difference in optical path between the radiation transmitted through the mirror 3 n plates 5,6,7, and the radiation reflected from mirror 3, an additional plate 8 is installed perpendicular to the optical axis of the photodetector 4 (the formula for calculating the thickness of the plate 8 is given). - T olivine, wedge-shaped, the angles of inclination to the optical axis of the additional plates and the translucent mirror are equal. The angles between the projections of the normals to the surface of the additional plates and the translucent mirror are 90 ° for an odd number of plates and 120 for an even number of them. 2 Il. (L to 4; 4

Description

112

The invention relates to optical instrumentation and can be used in autocollimation theodolites and other optical devices that simultaneously emit and receive radiation.

The aim of the invention is to improve the pointing accuracy of a n; and the autocollimation image of the mark by obtaining a symmetrical image in the field of view,

Fig, 1 shows a diagram of the autocollimation device; figure 2 - the mutual position of the projections of the normals to the translucent mirror and additional plates.

The device contains a radiation source 1, a lens 2, an inclined semi-transparent mirror 3, a photodetector 4, additional plates 5-8.

Autocollimating device operates as follows.

The light flux leaving the source 1 passes the inclined plates 7-5 and the mirror 3, is converted by the objective 2 into a parallel beam and goes to the illuminated device. The light flux from this device returns to the lens 2, is reflected from the surface of the inclined semitransparent mirrors a 3, passes over the plate 8 and enters the radiation receiver 4. Each of the plates 5-7 introduces asymmetrical aberrations.

B. depicted in FIG. 1, the implementation example of the number of additional inclined plates is three. Together with the substrate of the mirror 3, due to the uniform rotation of the plate, all aberrations distort the image axisymmetrically. The effect of the axisymmetric aberrations} is compensated for by the I and the techniques used in the calculation of lens 2. The optical path difference between the radiation transmitted through the semitransparent mirror 3, plates 5-7 and the radiation reflected from the semitransparent mirror 3 is compensated by plate 8 installed before photodetector 4. The length of the axial beam through this plate is equal to the length of the axial beam through the plates 3,5,6 and. The plate thickness is calculated by the formula

d (k-h)

g. Sini COS arcSinJ

de 1 p

cl i k

plate thickness; the refractive index of the material;

thickness of the translucent mirror substrate;

angle of inclination to the axis of the lens of a translucent mirror; the number of additional plates.

With three additional plates (Fig. 2a), the angles between the projections of the normals are 90 °, 180, and 270, respectively. With two plates (Fig. 26), .120 ° and 240 °, and with one (Fig. 2c), 90. The dotted arrow indicates the projection of the normal to the translucent mirror, and the solid arrow denotes the projections of the normals to the additional plates.

Unlike the autocollimation device with an inclined translucent

with a mirror, in which the image of a point source is distorted by aberrations, and first of all by astigmatism, the image of a point, in a strip, when installing additional inclined plates, the image of the same point source acquires an axially symmetric sighting.

Claims (1)

Invention Formula An autocollimating device containing a radiation source and a translucent mirror mounted obliquely to the optical axis and forming two optical channels, one of which has a lens and the other a photodetector 5, characterized in that, for the purpose of aiming a collimation, image of the mark due to obtaining a symmetrical image in the field of view, between the radiation source and the translucent grain. Calc1M was added to additional plates, where ..; 3, from the optically transparent -NOGS1 material from the display elem refractive index equal to the refractive index of the material of the semitransparent mirror, tolpshna, and the wedge angle to the optical axes of which are respectively equal to the thickness, wedge angle VT to the optical axis obtained 1fozrach} th mirror, while in plos31244616 the bones perpendicular to the optical axis, the angles of the melide by the projections of the normals to the surface of the additional plates and the surface of the semitransparent mirror are 90 ° for an odd number of additional plates and 120 for an even number of additional plates, and between the translucent mirror and the photodetector perpendicular to the optical the axis is set plate, the thickness of which 1 is chosen equal to 5 where ten d (k + 1) ABOUT cos arcsin siniV -j where n the refractive index of the material; d is the thickness of the translucent mirror; i is the angle of inclination of the translucent mirror to the optical axis; k is the number of additional plates. I I 6 FIG. 2