SU1571393A1 - Device for checking dials - Google Patents

Abstract

The invention relates to geodetic instrumentation and can be used to control the angular measures of geodetic instruments. The aim of the invention is to improve accuracy by reducing the effect of misalignment. The device comprises a rotary table 2, a carriage 4 mounted for radial movement relative to the axis of the rotary table 2, a reading unit with an optical element, photodetectors and an axis mounted on the carriage with the possibility of spatial angular displacements relative to the carriage 4 and linear displacements parallel to the axis of the rotary table 2, and a laser 7 with a refractive element 8 rigidly bonded to it, mounted on a carriage 4 with the possibility of spatial angular displacements relative to it and an optical interface enny with photodetectors. The optical element is designed as a fiber optic bundle 11 and a flat reflector 14, optically coupled to a laser. 1 il.

Description

The invention relates to geodetic instrumentation and can be used to control the angular measures of geodetic instruments (for example, dials, code disks, circular scales, etc.).

The purpose of the invention is to improve the accuracy of the device by reducing the effect of misalignment.

The drawing shows a diagram of the proposed device.

The device contains a controlled limb 1 mounted on a turntable 2, connected through a bearing to the base 3. On the base 3, through the mechanism for moving the carriage 4, equipped with a micrometric reading device 5, there is a housing 6 of the photoelectric reading device and a laser 7. On one of the laser mirrors a turning prism (refractive element) is fixed to the catheter face 8. The laser is mounted on its tilting device in two mutually orthogonal planes 9. The photoelectric reading device 10 is made of The aperture of fiber elements (bundles) 11, glued between glass plates 12, is provided with photodetectors and is connected

with the housing 6 through the ball bearing 13. At the end of the plates 12 outside the ends of the fibers a reflective coating (reflector) 14 is applied (after the fibers together with the plates are polished normally their axes). The mechanism 15 moves the plates 12 together with the fibers 11 along the axis perpendicular to the plane formed by the device for inclining the ball 16.

The device works as follows.

Controlled limb (code disk) 1 set on the turntable 2 and rigidly fix it on the latter. The mechanism for moving the carriage 4 is mounted on the base 3, moving it using a micrometric reading device 5 to the desired track of the controlled limb 1. The laser beam 7, rotated vertically with a prism 8 attached to the output mirror of the laser 7, is directed to the surface of the limb 1. If the optical axis of the laser 7 is parallel to the surface of the checked limb 1, then the beam reflected from the surface of the limb must return

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with prism 8 along the same optical path as the direct beam arriving at the limb. The forward beam, scattered on the surface of the prism 8, leaves a visible trace on it, therefore the reflected beam, provided that the surface of the limbus 1 is parallel to the axis of the laser 7, also falls into this spot, and they merge into one light spot. If there is a mismatch of the spot of light on the surface of the prism 8, the consumption of the light is observed and, as a result, the duplication of spots is observed. Then, moving the laser 7 in two coordinates, the optical axis of the laser 7 is parallel to the plane of the limb 1 using the movement mechanism. The control is performed by matching the spot of the direct and reverse radiation on the surface of the prism 8. Then the body 6 is inserted into the movement mechanism of the carriage 4 in which the photoelectric reading device is mounted. The laser beam 7, passing the limb 1, through the ends of the optical fibers enters the photodetector. The output ends of the fibers are the entrance pupil of the photoelectric reading device 10. After polishing the normal axis of the fibers 11 of the plates 12 and the input ends of the fibers 11, and applying a reflective coating 14 on them, outside the light zone of the photoelectric reading device (outside the ends of the fibers) the reading device 10 with the plane of the reflector formed by the coating 14. The laser beam 7 is reflected from the coating 14 and returns to the prism 8. In the normal position of the optical axes of the fibers, On the surface of the limb, the return beam will arrive at the same point on the surface of the prism 8 from which it emerged, and there will be one spot on the surface of the prism 8. If there is a mismatch, a displacement of the radiation spot relative to each other will be observed. Clicks of the reading device 10 fixed in the ball bearing 13g in two mutually orthogonal planes using the device for tilting the ball bearing 16 achieve a matching spot on the surface of the prism 8. Then, the output signal of the photodetector of the photoelectric reading device 10 is monitored to achieve maximum 30

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maximum value, moving the photoelectric reading device 10 in the ball bearing with the help of the movement mechanism 15. The movement is carried out along an axis perpendicular to the plane of the ball joint installation, after which the elements are fixed in the position obtained.

Claims (1)

Invention Formula A device for controlling the dials, comprising a turntable, a carriage mounted for radial movement relative to the axis of the turntable, a reading unit with an optical element, photodetectors, and an axis mounted on the carriage, 936 and a laser with a refractive element rigidly bonded to it, characterized in that, in order to increase the accuracy by reducing the influence of the de-scaling, the readout unit is adapted to spatial angular displacements relative to the carriage and linear 3 displacements parallel to the axis of the turntable, the laser is mounted on a carriage with the possibility of spatial angular displacements relative to it and optically coupled with photodetectors. and the optical element is made in T a fiber-optic cable and a flat reflector optically coupled to a laser.