PL201151B1 - Device designed to determine vertical direction of laser beam - Google Patents

Abstract

A device for determining the vertical direction of a laser beam comprising a laser module in a housing which is equipped with a regulating weight and damping system rings and is suspended on a rod in an external housing equipped with guides and containing a damping liquid, characterized in that the laser module (1) is stably mounted by means of rectification screws (2) in an opening (3) of a cylindrical metal housing (4) located eccentrically in relation to its axis, and the housing (4) is equipped with a sliding regulating weight (5) mounted in its upper base and with known damping system rings (6) immersed in a damping liquid (13), furthermore the housing (4) together with the laser module (1) is suspended on an inelastic rod (7) attached to a beam (9) which is supported on guides (10) slidably mounted in sockets (11) releasably connected to the external housing (12), and the external housing (12) in its upper part is equipped with is equipped with a power socket (14) connected by electric wires (15) with plugs (16) mounted on the beam (9) and connected by springs (17) with the laser module (1) and with a cover (18) with a glazed outlet hole (19) located above the outlet of the emitted laser beam (20)

Description

(21) Application number: 360810 (51) Int.Cl.

G01C 9/00 (2006.01) G01C 15/10 (2006.01)

Patent Office of the Republic of Poland (22) Date of filing: 23/06/2003 (54) for determining the vertical direction of a laser beam

(73) Patent holder: (43) The application was announced: AGH University of Science and Technology, Kraków, Poland 27.12.2004 BUP 26/04 (72) Inventor(s): Mieczysław Jóźwik, Krakow, PL (45) The patent was granted on: 31/03/2009 WUP 03/09 (74) Attorney: Biernat Janina, AGH University of Science and Technology

(57) A device for determining the vertical direction of a laser beam, comprising a laser module in a housing equipped with a regulating weight and damping system rings and suspended on a rod in an external housing equipped with guides and containing damping liquid, characterized in that the laser module (1) is stably mounted by means of rectification screws (2) in an opening (3) of a cylindrical metal housing (4) located eccentrically in relation to its axis, and the housing (4) is equipped with a slidable regulating weight (5) mounted in its upper base and with known damping system rings (6) immersed in damping liquid (13), furthermore the housing (4) together with the laser module (1) is suspended on an inelastic rod (7) attached to a beam (9) which is supported on guides (10) slidably mounted in sockets (11) releasably connected to the external housing (12), and the external housing (12) in the upper part it is equipped with a power socket (14) connected by electric cables (15) with plugs (16) mounted on the beam (9) and connected by springs (17) with the laser module (1) and with a cover (18) with a glazed outlet hole (19) located above the outlet of the emitted laser beam (20).

PL 201 151 B1

Description of the invention

The subject of the invention is a device for determining the vertical direction of a laser beam, used in geodetic measurements, especially in mining areas for measuring the deflection of building structures from the vertical.

Known laser-optical plummets for determining the vertical direction comprise a laser assembly in a housing which is mounted vertically on a leveled surveying tribrach, and the beam of emitted laser light is directed towards the nadir or zenith.

The laser mining plummet, known from Polish patent no. 156,901, comprises a laser and telescopic telescope assembly mounted stably in a metal housing equipped with rings, each of which is immersed at its lower end in a damping fluid contained in a separate tank. One tank is attached to the upper and the other to the lower part of the plummet's outer housing. Sliding weights are mounted on the lower part of the metal housing of the laser/telescope assembly to adjust the center of gravity of the assembly. The laser/telescope assembly is suspended in an outer flameproof housing on a cable attached to a guide, slidably mounted on a guide connected to the outer flameproof housing. A high-voltage power supply is mounted on the outer flameproof housing and is electrically connected to the laser. The outer flameproof housing, along with the high-voltage power supply, is pivotally mounted on a tribrach with a transparent base in the area where the collimated laser beam exits the assembly. The laser assembly with a telescopic telescope is located between the resistance elements attached above the laser to the external flameproof housing and the resistance ring threadedly connected to the tribrach, wherein the resistance elements and the resistance ring constitute the arresting system of the laser assembly with a telescopic telescope.

The disadvantage of the known solutions is the excessive sensitivity to the influence of vibrations of the ground on which the tribrach is located and to the wind, when using a plummet with the nadir direction of the laser beam in the measurements of the deflections of tall building structures.

A device according to the invention, comprising a laser module in a housing equipped with an adjustment weight and damping rings, suspended on a rod in an external housing equipped with guides and containing damping fluid, is characterized in that the laser module is stably mounted using rectification screws in a bore of a cylindrical metal housing located eccentrically to its axis, and the housing is equipped with a sliding adjustment weight mounted on its upper base and known damping rings immersed in the damping fluid. Furthermore, the housing with the laser module is suspended on an inelastic rod attached to a beam, which is supported on guides slidably mounted in sockets releasably connected to the external housing. The external structure, in its upper part, is equipped with a power socket connected by electrical wires to plugs mounted on the beam and connected to the laser module by springs, and a cover with a glazed outlet opening located above the emitted laser beam outlet.

The solution, according to the invention, is characterized by simplicity, and the use of a semiconductor laser enables the miniaturization of the device and thus reduces its weight, which is important when using the device in field measurements of objects' deflections from the vertical.

The subject of the invention is shown in an exemplary embodiment in the drawing, which shows the device in cross-section.

The device, according to the invention, comprises a semiconductor laser module 1, which is securely mounted by means of rectification screws 2 in an opening 3 of a cylindrical metal housing 4, positioned eccentrically with respect to its axis. Housing 4 is equipped with a sliding adjustment weight 5 mounted at its upper base and with known damping system rings 6, and together with laser module 1, it is suspended on an inelastic tension rod 7 by means of a holder 8 to a flat bar beam 9. Beam 9 is supported on guides 10 slidably mounted in sockets 11 releasably connected to an outer housing 12 filled with damping liquid 13 to 3/4 of its height. The outer casing 12 in its upper part is equipped with a power socket 14 connected by electric cables 15 with plugs 16 mounted on the beam 9 and connected by springs 17 with the laser module 1, and with a cover 18 with a glazed outlet opening 19 located above the outlet of the emitted laser beam 20.

PL 201 151 B1

The adjustment weight 5 and the rectification screws 2 of the housing 4, together with the laser module 1, are used for coarse and fine adjustment of the center of gravity of this system relative to its suspension axis, respectively. During operation, the device is placed directly on the ground, and the emitted laser beam 20 automatically assumes a vertical position under the influence of gravity.

Claims (1)

Patent claim Device for determining the vertical direction of the laser beam, comprising a laser module in a housing, which is equipped with an adjusting weight and rings of the damping system, and is suspended on a rod in an outer housing provided with guides and containing damping liquid, characterized in that the laser module (1) is mounted stable by means of rectifying screws (2) in the opening (3) of the cylindrical metal housing (4) located eccentrically to its axis, and the housing (4) is equipped with a sliding adjustment weight (5) mounted on its upper base and with the known rings (6) ) of the damping system immersed in the damping fluid (13), moreover, the housing (4) with the laser module (1) is suspended on an inelastic tie (7) attached to a beam (9), which is supported on guides (10) slidably seated in sockets ( 11) detachably connected to the outer casing (12), while the outer casing (12) in the upper part is equipped with a power socket (14) connected electric wires (15) with plugs (16) mounted on the beam (9) and connected by springs (17) to the laser module (1) and to the cover (18) with a glazed outlet opening (19) located above the outlet of the emitted laser beam (20) .