SU1446474A1 - Apparatus for measuring angles - Google Patents

Description

(21) 3862731 / 24-10

(22) 03/06/85

(46) 12/23/88. Bup. Number 47

(71) Research Institute for Applied Geodesy

(72) V.N.Pshkin

(53) 528.52.521 (088.8)

(56) USSR Copyright Certificate No. 97976, cl. G 01 S 1/00, 1953.

USSR Author's Certificate No. 849005, class, G 01 B 11/26, 1981.

(54) DEVICE FOR MEASURING ANGLES

(57) The invention relates to geodetic instrumentation, for example, to means of measuring angles between directions for sighting targets, and can be used in geodesic production in order to improve measurement accuracy. The device for measuring angles contains a base 1, an alidade 3, an autocollimation telescope 5, a reference prism 8 with lateral reflecting faces. This .jun prism 8 with side reflecting edges is fixed on

Alidade 3 can be rotated, the edge of the reference prism 8 is aligned with the vertical axis of rotation of Alidade 3. The reference prism 8 is made as two optical wedges glued together, completely overlapping the optical diameter of the telescope lens 5. The optical micrometer 7 is aligned with a split negative lens and is positioned between the reference and autocollimation telescope. The sighting targets are in the form of rectangular dihedra. In the field of view of the pipe, two autocollimation images of the cross of the filament mesh, reflected from rectangular dihedra, are simultaneously observed. Autocollimation images are brought into the center of the field of view of the tube and are combined with an optical micrometer. Take samples using an optical micrometer. The measured angle is defined as the sum of the values of the reference angle and the measured deviation of the measured angle from the reference angle. 1 hp f-ly, 2 and.a.

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The invention relates to the field of geodetic instrumentation, in particular, to means of measuring angles between directions to sight targets located at arbitrary distances from the tops of the measured angles, and can be used in geodesic production.

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

FIG. 1 shows the device, a general view; in fig. 2 is a diagram of angle measurements using this device.

The device comprises a base 1 (Fig. 1) with a ball retainer 2 rigidly attached to it, an alidade 3 mounted on the base 1 with the possibility of rotation around a vertical axis. On alidade 3 there is a cylindrical level 4, an autocollimation telescope 5 with an autocollimation eyepiece 6 and an optical micrometer 7 with a split negative lens positioned in front of the telescope lens and rigidly attached to it, the reference prism 8 fixed from two glued together optical wedges and rotated on alidade. The edge of the reference prism 8 coincides with the vertical axis of rotation of the alidade. The optical axis of the telescope 5 is located in the plane of the bisector of the reference angle. Alidade 3 is equipped with a clamping screw 9 and a leading screw 10 azimuthal rotation about the vertical axis of rotation of the alidade.

The sight targets are made in the form of rectangular dihedrons 11 (FIG. 2). The device and the rectangular dihedra are mounted on geodetic marks 12. The optical micrometer 7 is equipped with a micrometer screw 13.

The reference prism 8 is made in the form of two optical wedges glued together with side reflecting faces. The angles between the reflecting faces are given such and the wedges are glued together in such a way that the resulting reference angles correspond to the measured ones. The shape of the reference prism 8 is determined by the design of the optical micrometer 7 and the need to have two reference angles for measuring the angles of the geodetic reference network of the ring accelerator.

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The driver, Dp of the operational change of the given reference angles of the prism 8 is fixed on alidade 3 with the possibility of rotation about an axis parallel to the vertical axis and fixing in the position when the bisector of the reference angle of the prism 8 coincides with the optical axis of the telescope 5. At the same time, the edges of the reference angles are located on equal to the distance from the parallel vertical axis and, when measured, the corresponding one lies on the vertical axis. To measure horizontal angles, the "reference angle f value of the prism 8 is equal to

 180-,

The optical micrometer 7 serves to measure in the angular measure the deviations of the measured angles from the reference angle given by the prism 8,

The rectangular dihedron 11 is mounted on a pedestal, similar to the base 1, rotatably about an axis passing through the center of the ball retainer. The edge of the rectangular dihedral 11 coincides with the axis of rotation and is adjusted to a vertical position by means of a level (not shown).

Angle measuring device

works as follows. I

The device is mounted on the geodesic mark 12, centered in the sign sleeve by means of a ball retainer 2 and leveled by means of a cylindrical level 4. The vertical axis of rotation of the device coincides with the center of the mark, with the apex of the measured angle. On the other two signs, on similar pedestals, rectangular dihedra 11 is mounted, centered and leveled. Approximately orient the sighting axis of the autocollimation telescope 5 in the direction of the bisector of the measured angle, then orient more accurately, observe it with the eye of the tube 5 until it appears in the field of view of the dihedra 11. Fix this position with a clamping screw 9,

Auto-stimulation telescope 5 is focused on the plane of the edges of the rectangular dihedron 11, while in the field of view of the pipe 5 two

the autocollimation images of the cross of the filament mesh, reflected from rectangular dihedra 11, arbitrarily disposed relative to each other. Using the target screw 10, the autocollimation images are brought into the center of the field of view of the pipe 5 and the rotation of the micrometer screw 13 of the optical micrometer 7 combines them. A sample is taken from the optical micrometer 7. The measured angle is determined as the sum of the values of the reference angle and the measured deviation of the measured angle from the reference angle.

Claims (2)

Invention Formula reflective edges mounted on the alidade for rotation, the edge of the reference prism is aligned with the vertical axis of rotation of the alidade, micrometer, cylindrical level and sighting targets, characterized in that, for the purpose of accuracy, the reference prism is made in the form of two optical glued together wedges completely overlapping the light diameter of the lens of the telescope, and the micrometer is made optical and is located between the reference prism and the autocollimation telescope. 2. The device according to claim 1, about t l and that the optical is 1. A device for measuring angles, 20 micrometers is complete with a split containing a base, an alidade, an autocollimation telescope with a lens, a reference prism with a negative lens, and the sighting targets are made in the form of rectangular dihedra. fi 2.