SU849005A1 - Device for measuring angle between sighting target directions - Google Patents

Description

The invention relates to geodetic instrumentation, in particular, to means of measuring angles on the ground, and can be used in geodesic production, for example, with high-precision installation of various equipment of automatic line conveyors, accelerators of charged particles, when measuring angles in constant geodetic networks fastening and with the same value of the angles. . Theodolites of various grades are known, for example, T1, T2, which are instruments intended for measuring angles in geodetic reference networks. However, these instruments do not provide the required accuracy due to errors in limb diameters ;. The closest to the invention by. The technical entity is a device for measuring the angle between the directions to the sighting targets, which contains a base located on our head and an autocollimation telescope mounted on the alidade with an offset relative to its axis of rotation G2. However, the known device does not provide the possibility of measuring the angle between the directions to the sighting targets that are equally spaced from the top of the angle lying on the axis of rotation of the alidade. The purpose of the invention is to make it possible to measure the angle between the directions to the target, equally spaced from the top of the angle lying on the axis of rotation of the alidade. . The goal is achieved by the fact that the device is equipped with a reference multifaceted prism with lateral reflecting edges fixed on the base so that its upper base passes through the sighting axis of the tube and a half-lens mounted between the prism and the telescope lens coaxially with it. FIG. 1 shows the proposed device, a general view; in fig. 2 the relative position of the structural elements of the device when measuring the angle. The device (Fig. 1) contains a base 1, rigidly fastened with it with a bar clamp 2 and a fixed 1 stand 3 on which is mounted

cylindrical level 4. Based on fixed alidade 5 with the possibility of rotation around a vertical axis. On the basis of a fixedly fixed standard multifaceted prism b with side reflective edges. The alidade is equipped with a stand 7 carrying the telescope 8. In front of the lens of the telescope 8 there is an attachment 9, made in the form of a half-length, the focal distance of which is equal to the side of the measured angle. The optical axis of the half lens is aligned with the optical axis of the telescope. The telescope has an autocollimation eyepiece p 10 and a micrometer 11. Height 7 provides the location of the telescope 8 at a level at which the sight axis of the tube and the flat face of the half lens lies in the plane of the upper base of the reference polyhedral prism b. Such an arrangement of optical elements allows simultaneously in the field of view of the telescope 8 to see both the face of the reference multifaceted prism 6 and the sighting target removed to any finite distance from the device. Since the target sight is located at the focus of the half lens, together with the half lens they form a long-focus collimator, which makes it possible to measure the horizontal angle as a deviation from the reference one, free from errors of refocusing and errors due to the diameters of the limb. UROL Cf between the reflecting faces of the reference multifaceted prism b is chosen close to the angle oL measured on the ground (Fig. 2).

The device works as follows.

The device is centered in the hub of the geodesic mark 12 using a ball retainer and leveled using level 4. In this position, the apex of the measured angle lies on the axis of rotation of the alidade 5. The alidad along with the telescope 8 is turned in a horizontal plane until target 13 with suspension 14 will not appear in the field of vision of the telescope (position I). Combine the actual image of the cross of the filament grid of the telescope B with its autocollimation image reflected from the face of the prism 6. This is the position of the alidade 5 fic put with a clamping screw (not shown). Using the bisector of the micrometer 11, the distance between the image of the target and the combined autocollimation image of the cross of the reticle is measured.

Unfasten the Alidade clamping screw and rotate the telescope 8 clockwise until the sighting axis of the telescope 8 is installed perpendicular to another reflecting face, where the target sight 13 with Chudwalki 14 (position II) falls into the field of view of the tube. . Position,. The alidides are fixed again with a clamping screw and the operations performed when aiming at the previous target sight 13 are repeated. The measured angle is determined from the difference in the corresponding readings.

 Measuring the angle between the directions to the sighting targets 13 and 13 is performed by comparing the angle on the ground with the angle of the reference, multifaceted prism without changing the focusing of the telescope and without counting

over the limb. Thus, when using the invention, the accuracy of angle measurement is improved due to the absence of errors in the graduation of diameters.

0 limb and for refocusing the telescope.

For the conditions of the constant fixing of geodetic support networks, such as accelerators of charged particles,

5 radio telescopes that are characterized by the same angles of rotation and equal distances from the top of the angle to the target. The proposed device, in addition to improving the accuracy, also makes it possible to simplify the method and reduce the measurement time.

Claims (2)

1. Guide surveyor. Ed. V.D.Bolshakova. M., Nedra, 1966, p. 426-437. 0- 2. Linear and angular measurements. Ed. GD Burdul. M., Ig - (- in Stam.dart, 1977, pp. 328-341 (prototype.