SU444053A1 - Device for remote measurement of the angles of rotation of objects - Google Patents

Description

i

The invention relates to the field of geodetic instrumentation and, in particular, is intended for highly accurate geodetic measurements of the angles of rotation of various structures at large distances.

Devices for measuring the angles of rotation of objects are known, which contain an autocollimator and a flat mirror mounted on the object, and the objectives of two autocollimators are rigidly connected to the reflector.

The known device is intended to measure the angles of rotation of an object in a plane parallel to the reflecting surface, and is not adapted to measure the angles of rotation of objects around a vertical axis.

In addition, lenses attached to the object require periodic focusing and alignment, which makes it difficult to follow deformations that are difficult to reach, distant to a large distance; objects and does not provide the required accuracy. The well-known angle measurement methods.

rotation around the vertical axis of distant objects is inconvenient and inaccurate, since when turning an object on which a reflector is fixed (flat mirror), the sighting beam deflects by a certain angle and, therefore, the recording device must be moved to the corresponding distance in the direction of beam deflection .

The purpose of the invention is to ensure the registration of various angles of rotation of remote, hard-to-reach objects around the vertical axis from one point of the station of the recording instrument with high measurement accuracy.

This is achieved by the fact that a diffraction grating -... ka, rigidly connected with it, is installed in front of the reflector, fixedly mounted on the object and made in the form of tripleprism, so that radiation from the laser light source passes through the diffraction grating reflected from the triple -prisms and at the exit. The second pass through the diffraction grating to the recording device installed at the station

radiation source; The recording device contains two photodetectors, the distance between which is equal to a quarter of the distance between the adjacent minima or maxima of the reflected light flux. On: g output of photodetectors the recorder is turned on. ,; FIG. 1 shows a block diagram of the proposed device; figure 2 shows: the path of the rays in the triple prism through the diffraction grating. Iq

The device consists of a triple prism; 1, attached to object 2. In front of the triple prism 1, a diffraction grating i 3 is rigidly connected to it. At some distance from the object; jg laser 4 and photodetectors 5,6 are installed, at the output of which the recorder is turned on 7. The device works as follows.,

The laser radiation 4 is directed to j 20 object 2, passes through the diffraction | grid (see Fig.2) and reflects from triple prism 1 .:

 After reflection, the light flux again | i passes through diffraction grating 3 125 and is received by photodetectors 5,6, j

registering the change in the intensity of the light flux using the recorder 7.,

When the object is rotated, periodically i: the intensity of the reflected DZ of the light flux recorded by the photodetectors changes.

The angle at which the luminous flux goes through a full cycle of intensity change (for example, from minimum to minimum 1 3b depends on the grating period and the size of the triple prism.

With a period equal to 1O micron and height

triple prism .80 mm, it is enough to turn the prism by 25 so that the intensity of the luminous flux. has passed a full cycle (from minimum to minimum).

Loop fractions are determined from the graph.

recorder.

I Compared the change in the intensity of the light flux on both photodetectors, you can determine the direction of rotation of the object.

In the case when the luminous flux

i through the cracks in the lattice and reflected, again.

 gets into cracks, fixes maximum /

light flux.

When a prism rotates, and the light i that passes through the slits, reflected, enters / gives to the opaque portions of the lattice, the minimum of the light flux is fixed.

Subject invention

A device for remote measurement, no angles of rotation of objects, containing a source of radiation, two photodetectors, the output of which is connected to a recording device, a reflector mounted on the object, characterized in that: in order to increase the accuracy of measurements and ensure registering various angles of rotation of an object from one point of a standing registering device, in front of a reflector, made in the form of triples. a prism, a diffraction grating is installed, rigidly connected to it, and the distance between photo receivers is equal to a quarter of the distance between adjacent minima or maxima of the reflected light flux.

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Fig1