RU2272250C2 - Optical circuit of optic-laser centering device - Google Patents

Abstract

FIELD: optical engineering.

SUBSTANCE: optical circuit of optic-laser centering device has eye-glass, mesh, objective, prism made for change in ray path by 90° and for get direct image in eye-glass. It also has laser module made for creation of narrow laser beam to radiate in visible spectrum range, light-splitting unit disposed between objective and prism. Optical coating is applied onto splitting face of light-splitting unit. Optical coating is made for reflection of light flux of laser beam and for transmission of visible image into eye-glass. Optical circuit can be used in geodetic devices during natural day and night time.

EFFECT: improved comfort at application.

2 cl, 2 dwg

Description

The invention relates to instrumentation and can be used in geodetic instrumentation. Many surveying instruments are equipped with centering devices. The centerir allows you to install a geodetic instrument (theodolite, light range finder, total station, etc.) above the point of the terrain relative to which the measurements are made.

Known laser centering device (patent RU No. 2039933, IPC 6 G 01 C 9/20, published July 20, 95), containing a laser with a beam splitting unit, a device for setting it in its original position.

A disadvantage of the known device is the design complexity.

The closest to the claimed invention in terms of the essential features is the optical scheme of the theodolite plummet (A.I. Zakharov. Geodetic instruments. Handbook, M .: Nedra, 1989, p. 45-46), containing an eyepiece, a collective lens-grid, a prism made with the possibility of deflecting the beam by 90 ° and receiving in the eyepiece a direct image, the lens located behind it. This technical solution is selected as a prototype.

The disadvantages of the prototype include the impossibility of its use when centering the geodetic instrument in conditions of poor visibility (for example, dark time of the day) or when installing and centering the instrument above a point in deep, shaded wells.

The task to which the claimed technical solution is directed is to create a universal, easy-to-use device with an extended scope.

To solve this problem, the optical scheme of the laser-optical plummet contains an eyepiece, a grid, a lens, a prism made with the possibility of changing the beam path by 90 ° and obtaining a direct image in the eyepiece.

New is the additional inclusion in the optical circuit of a laser module, configured to create a narrow laser beam, for example, red, a beam splitter located between the lens and the prism. An optical coating is applied on the dividing face of the beam splitting unit, configured to reflect the light flux of the laser beam and transmit a visible image of the terrain into the eyepiece. The optical circuit also includes a filter located between the beam splitting unit and the lens.

The presence in the optical system of a plummet: an eyepiece, a mesh, a lens, a prism made with the possibility of changing the beam path by 90 ° and obtaining a direct image in the eyepiece will ensure the operation of the device in daylight. Introduction to the optical circuit of the centering of the laser module, made with the possibility of creating a narrow laser beam, a beam splitter and placing it between the lens and the prism, as well as applying an optical coating on the dividing face of the beam splitter block, made with the possibility of reflecting the light flux of the red laser beam to the terrain point and transmitting a visible image of terrain objects into the eyepiece, it will provide high accuracy of centering the device in poor lighting conditions. The filter, placed between the beam splitting unit and the lens, weakens the possibility of the diffused light flux of laser radiation entering the eyepiece. In addition, the inventive optical alignment system allows the operator to center the device on a red spot at a point in the terrain without using an eyepiece.

Using the center of geodetic instruments of the inventive optical scheme with the above set of essential features will allow:

1. To use one centir in geodetic instruments for their installation in daylight and dark in open areas or in deep, shaded wells.

2. To increase the comfort of working with the device due to the fact that when centering it, the operator can use the eyepiece or work without it.

The essence of the invention is illustrated by the optical scheme of the plummet. Figure 1. shows the optical diagram of the optical laser centering device, figure 2 - section aa in figure 1.

The optical layout of the plummet contains an eyepiece 1, a grid 2, a lens 3, a filter 4, a beam splitter 5, a prism 6, a laser module 7. The grid 3 is made in the form of a plane-parallel plate and two concentric circles are drawn on one of its surfaces. Prism 6 is configured to receive a direct image and deflect the beam by 90 °. The beam splitting unit 5 is made in the form of two prisms, on the glued face of which an optical beam splitting coating is applied. With one face the beam splitting unit 5 is glued to the prism 6, the other to the filter 4. It is allowed not to glue the positions 4, 5, 6 together.

The optical scheme of the plummet works as follows.

Lens 3 projects the image of the terrain point on the grid 2. The operator sets the vertical axis of the device in level. Then, observing through the eyepiece 1 and moving theodolite, it combines the grid crosshair (center) with the terrain point. Focusing the image of the terrain point is carried out by moving the movable ocular part, including the eyepiece 1 and the mesh 2, in the longitudinal direction. The eyepiece 1 is controlled by the rotation of the diopter ring until a clear image of the concentric circles of the grid 2 is obtained. In case of insufficient illumination of the terrain point or when working without the use of the eyepiece, the center works as follows. The narrow red beam of the laser module hits the beam splitting unit 5 and, reflected from the glued beam splitting face, hits the prism 6. Then, deviating 90 °, it hits a point on the ground. In this case, the filter 4 improves the visibility of the terrain point in the eyepiece. The operator, observing through the eyepiece 1, moves the device, achieving alignment of the point on the ground with the center of the red light spot of the laser module 7 or overlapping of the grid 2 (center) with the point of the terrain. In addition, the presence of a red round spot of small diameter allows the operator to center the device without observing into the eyepiece.

The claimed invention was used at the FSUE "PA" UOMZ "in the development of new modifications of electronic total stations, theodolites and light range finders.

Claims (2)

1. The optical scheme of the optical laser centering device containing an eyepiece, mesh, lens, prism, configured to change the beam path by 90 ° and obtain a direct image in the eyepiece, characterized in that it further includes a laser module configured to create a narrow laser beam with radiation in the visible region of the spectrum, a beam splitting unit located between the lens and the prism, on the dividing edge of which an optical coating is applied, made with the possibility of reflection of the light flux of the laser beam and transmitting the visible image into the eyepiece. 2. The optical scheme of the optical laser centering device according to claim 1, characterized in that the laser module is configured to create a red laser beam.

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