WO1995034849A1 - A method and a device for remote controlling of one or more working machines - Google Patents

A method and a device for remote controlling of one or more working machines Download PDF

Info

Publication number
WO1995034849A1
WO1995034849A1 PCT/SE1995/000694 SE9500694W WO9534849A1 WO 1995034849 A1 WO1995034849 A1 WO 1995034849A1 SE 9500694 W SE9500694 W SE 9500694W WO 9534849 A1 WO9534849 A1 WO 9534849A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
machines
characterized
cube
machine
Prior art date
Application number
PCT/SE1995/000694
Other languages
French (fr)
Inventor
Carel Jibben
Original Assignee
Contractor Tools Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to SE9402047A priority Critical patent/SE9402047L/en
Priority to SE9402047-6 priority
Application filed by Contractor Tools Ab filed Critical Contractor Tools Ab
Publication of WO1995034849A1 publication Critical patent/WO1995034849A1/en

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D1/00Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot
    • G05D1/0011Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot associated with a remote control arrangement
    • G05D1/0033Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot associated with a remote control arrangement by having the operator tracking the vehicle either by direct line of sight or via one or more cameras located remotely from the vehicle
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/004Devices for guiding or controlling the machines along a predetermined path
    • E01C19/006Devices for guiding or controlling the machines along a predetermined path by laser or ultrasound
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F3/00Dredgers; Soil-shifting machines
    • E02F3/04Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80Component parts
    • E02F3/84Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/841Devices for controlling and guiding the whole machine, e.g. by feeler elements and reference lines placed exteriorly of the machine
    • E02F3/842Devices for controlling and guiding the whole machine, e.g. by feeler elements and reference lines placed exteriorly of the machine using electromagnetic, optical or photoelectric beams, e.g. laser beams
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D2201/00Application
    • G05D2201/02Control of position of land vehicles
    • G05D2201/0202Building or civil engineering machine

Abstract

A method for remotely controlling one or more working machines (2), for instance road grading machines, asphalting machines or like machines, with the aid of one or more target-seeking total stations (1) set-up at one or more defined places, and also with the aid of reflectors (3) in the form of a ring of cube-corner prisms mounted on respective machines. One or more sectors of the reflector (3) are activated in a manner which will cause the target-seeking total station (1) or total stations to adapt its/their control function or functions.

Description

A METHOD AND A DEVICE FOR REMOTE CONTROLLING OF ONE OR

MORE WORKING MACHINES ',

The present invention relates to a method and to a device for the remote control of one or more working machines, such as road grading machines, asphalting machines or like machines, in accordance with the preamble of Claims 1 and 5 respective¬ ly.

Remote control systems for working machines of the aforesaid kind are commercially available and reference is made in this regard to International Patent Application No. PCT/SE93/00617 with the same Applicant as that of the instant Patent Application. Such a system enables the operative or working units to be controlled automatically to work surfaces of any geometrical shape whatsoever. Such a surface - the target surface - may be a road surface, the surface of an airfield runway, the surface of a building site, etc. The surface to be machined will not normally be flat, but have a three- dimensional topography. The working machine can be controlled automatically on the basis of positional information obtained with the aid of one or more target-seeking total stations that are located on specific sites in the working area, one such station having the function of an automatic geodimeter. The total station or stations detects or detect the position of a reflector on the machine and transmits or transmit to the machine-controlling information via radio signals, as described in the aforesaid International Patent Application. As will be understood, positioning becomes less accurate the further the working machine moves away from the target- seeking or scanning total station. For this reason, it has been found necessary when constructing, for instance, aircraft runways and roads, highways, etc., to position several target-seeking total stations along the building site and enable several machines to work simultaneously. As this work is in progress, there is always a risk that the reflec¬ tor on one machine will obstruct the path of the energy beam from a target-seeking total station that controls another machine at that moment in time. This total station; is therewith liable to lock onto the new machine, which is highly undesirable of course. It is also desirable to be able to exchange a machine-controlling total station simply and automatically, as the machine moves along or around the construction site.

It is known to use on such machines reflectors in the form of cube-corner prisms which are disposed in a ring generally in a plane parallel with the direction of movement of the machine. It is impossible to prevent a total station from locking inadvertently onto such a reflector or, without deactivating the total station, to replace the total station operating with this machine for another.

The invention enables several machines which work indepen¬ dently of one another on a construction site to be readily controlled by activating a respective reflector. This is made possible by virtue of the features characteristic of the invention as defined in the Claims.

The invention will now be described in more detail with reference to the accompanying drawings, in which Fig. 1 illustrates the control of an asphalting machine with the aid of the control system; Fig. 2 illustrates schematically the principle of a known reflector device comprised of cube- corner prisms; Fig. 3 is a schematic sectional view of the inventive reflector taken on the line III-III in Fig. 4, this sectional view being only partially complete; Fig. 4 is a side view of the inventive reflector; Fig. 5 illustrates a part of the reflector; Fig. 6 illustrates a variant of the inventive reflector in a view taken on the plane VI-VI in Fig. 7; Fig. 7 is a side view of this reflector; and Fig. 8 is a partial view which illustrates schematically a further variant of the inventive reactor according to Fig. 7. Fig. 1 illustrates schematically the application of a control ,system according to the aforesaid International Patent Application, in which three target-seeking or target-scanning total stations 1 are positioned at known places in space, for instance on a road or highway that is to be constructed. In the illustrated case, the control machine is an asphalting machine 2 which is provided with a reflector 3 in accordance with the invention. The total station or total stations 1 reads-off or read-off the position of the working machine through the medium of the reflector 3 and steer the machine with the aid of radio signals. The control system as such, however, does not form part of the present invention and will not therefore be described in detail here. Instead, the reader is referred to the aforesaid International Patent Application.

As before mentioned, the machine-carried reflector is comprised of a number of cube-corner prisms 4, see Fig. 2, which are disposed in mutually adjacent relationship to form a ring. A cube-corner prism is able to reflect light in the same direction as the angle of incidence, irrespective of movement of a light source within a given angular range of the prism. The range within which this reflection takes place - the re-reflection angular range - is referenced β in Fig. 2 and is normally about 60°. The angle regions β of mutually adjacent prisms 4 overlap one another, so as to obtain reliable reflection from the reflector 3. In the illustrated case, the reflector includes seven cube-corner prisms. Each angle overlap is about 5°, which provides a positive re- reflection angle range α for each prism, the angle range being slightly greater than 51°. Naturally, the re-reflection angle range of the prisms in the vertical plane will also be equal to β. The use of cube-corner prisms and their arrange¬ ment in accordance with the aforegoing provides a very reliable reflector that can be used in conjunction with earth-working equipment, for instance. Fig. 3 is a sectional view taken on the line III-III from above in Fig. 4 and illustrates the principle of one embodi¬ ment of an inventive reflector. The prisms are located above the section in the form shown in Fig. 2. Fig. 4 is a schemat- ic side view of the inventive reflector. The reflector is carried on the machine by means of a rod or staff 5 with the cube-corner prisms 4 mounted in the reflector in some appropriate manner, for instance with the aid of upper and lower collars 9 and 10 respectively. One or more cube-corner prisms can be selectively "deactivated", by screening-off one or more prisms or a sector of prisms, i.e. so that the reflector is unable to reflect light in a given direction or directions. To this end, there is mounted in front of each prism 4 a pivotal flap 11, wherein Fig. 4 illustrates in full lines one flap in an upwardly pivoted position and in broken lines a downwardly swung position in which the prism is exposed. The flap is pivotal about a shaft 12. For the sake of clarity, Fig. 4 shows only one flap. The flap 11 is pivoted by means of an electric motor 14 through the medium of a worm gear or wheel 13.

Fig. 3 shows the flaps 11 and their drive means, although not all have been shown for the sake of simplicity. The flaps are pivotal in their own plane, and the vertical edges thereof are bevelled so as to enable adjacent flaps to pass freely relative to one another, as indicated at 15 in Fig. 3.

Fig. 5 illustrates a flap 11 and a flap drive motor 14 on a larger scale. Fixedly mounted on the lower collar 10 is a shaft pivot 16, which is screwed to the collar, for instance. The flap 11 is carried by the worm wheel 13 through the medium of a hollow shaft 17. A spacing sleeve 18 is fitted between the collar 10 and the worm wheel 13, and the flap and worm wheel are fixed axially by means of a locking ring 19. It will be understood that the illustrated flap drive mechanism is only one example of a simple, mechanical drive mechanism. It is also conceivable to arrange the prisms so that the prisms can be swung independently out of the reflection plane, or alternatively so that the prisms can be lowered behind a screen. These solutions, however, are thought to be less attractive because of the high stresses to which the reflector is subjected. It is emphasized that the structural solution used to move the flaps and to mount and secure the cube-corner prisms form no part of the invention itself.

Another method of preventing a target-seeking total station from registering the current positional values of a reflector and sending these values to the machine with the purpose of controlling said machine, is to cause one or more sectors of the reflector facing towards the total station to send a signal thereto. The reflector may, to this end, be provided with light-emitting diodes which transmit IR-light at an accurately determined frequency, this light being received by receiver optics in the total station. The IR-light emitted by a light-emitting diode shall have the same directional sense as a dedicated or allocated cube-corner prism. The given field of view λ of the light-emitting diode will include an angle of about 28°. Compared with the earlier mentioned re-reflection angle range α = 51° of the cube- corner prism, it is therefore necessary to allocate to each cube-corner prism two light-emitting diodes which together will provide a covering angle greater than 50°. Figs. 6 and 7 illustrate a practical embodiment of an inventive reflector unit provided with light-emitting diodes, there being used seven cube-corner prisms 4 and fourteen light-emitting diodes 20 which are disposed in a ring at a given distance in relation to the centre of the cube-corner prism 3 and transmit IR-light at an accurately determined frequency. In the Fig. 6 embodiment, the light-emitting diodes 20' and 20" have been allocated to the cube-corner prism 4'.

Figs. 6 and 7 thus show a reflector provided with diodes relative to the reflector shown in the previous Figures. In the Fig. 6 illustration, the cube-corner prisms 4 have been angled in relation to one another at an angle of about;50° and moved outwards radially in comparison with the earlier described reflector. The reflection principle of the cube- corner prisms 4 of this arrangement, however, is the same as that of the Fig. 2 arrangement. The form of this reflector is governed by the precise position of the two light-emitting diodes allocated to each prism, this position of the diodes being determined by the position of the IR-light receiver optic of the total station.

Because the two light-emitting diodes (for instance 20' and 20") are allocated to the cube-corner prism 4' which, at that moment, is directed towards the target-seeking total station, the diodes will send their intensity modulated signals (light frequency) to the total station and the signals from one of the diodes will be received by the receiver optics in the total station, which therewith locks onto the reflector and steers the machine. By extinguishing the two light-emitting diodes 20', 20" allocated to the prism 4', the total station can be prevented from measuring the current positional values of the reflector and no control signals will be sent to the machine. The light-emitting diodes on the reflector can be switched-off by remote control (radio signals, light sig- nals). It is therewith possible to activate and deactivate the machine control of a target-seeking total station, for instance because the position of the station in relation to the machine has become critical or because another total station shall be prevented from locking onto the machine, and so on.

Because the light-emitting diodes require a given amount of space, it is difficult to provide room for the diodes in the reflector in the position determined exactly by the total station in relation to the allocated cube-corner prism. This drawback can be overcome by instead using mirrors or mirror prisms in the position determined in relation to the cube-corner prism, wherewith the light-emitting diodes can be placed closer to the vertical axis of the reflector, meaning that the prisms are placed closer to the axis and the angular errors of the angles measured by the total station are eliminated. Fig. 8 illustrates schematically an example of the use of prisms 21 having reflective hypotenuses disposed in the specific positions from which IR-light shall be emitted from the reflector. The diodes 20 themselves are placed in a ring below the prisms. Fig. 8 merely illustrates an example of the use of mirrors, in this case in the form of prisms, and the mirror surfaces may, of course, be turned in other ways which will permit different positioning of the light-emitting diodes, while several mirrors may be used for one and the same diode, therewith affording more flexibility with regard to the positioning of the diodes.

Claims

1. A method for remotely controlling one or more working machines (2), for instance road grading machines, asphalting machines or like machines, with the aid of one or more target-seeking total stations (1) set-up at one or more defined places, and also with the aid of reflectors (3) in the form of a ring of cube-corner prisms mounted on respec¬ tive machines, characterized by activating one or more sectors of the reflector (3) so that the target-seeking total station (1) or total stations relevant to controlling the machine (2) is caused to adapt its control function by the machine (2) .
2. A method according to Claim 1, characterized in that said activation is achieved by virtue by actuating the target-seeking total station a signal emitter for the sector or sectors concerned.
3. A method according to Claim 1, characterized in that said activation is achieved by virtue of screening a sector or sectors of the reflector.
4. A method according to Claim 1, characterized in that said activation is achieved by swinging the reflector sector or sectors out of the given reflection plane.
5. A reflector for earth-working machines whose working functions are controlled or steered by one or more target- seeking total stations (1) whose positions in space are known and which can be locked optically onto the reflector (3) carried by the earth-working machine, wherein the reflector is comprised of cube-corner prisms (4) disposed in a ring which lies in a plane generally parallel to the plane in which the machine moves, characterized in that there is mounted adjacent a respective cube-corner prism (4) a device (11) which is capable of interrupting the intended control of said machine from the total station.
6. A reflector according to Claim 5, characterized in that said device is comprised of light-emitting diodes (20) which transmit to the total station IR-light in the form of intensity modulated signals.
7. A reflector according to Claim 6, characterized in that the IR-light is transmitted through the medium of a mirror located after an allocated light-emitting diode.
8. A reflector according to Claim 5, characterized in that said device has the form of a flap (11) which can be swung to a position in front of its cube-corner prism. (4) so as to obstruct its reflecting ability.
9. A reflector according to Claim 5, characterized in that respective cube-corner prisms (4) can be moved individually out of the plane through the ring of prisms.
10. A reflector according to any one of Claims 5-9, charac¬ terized in that the device which functions to interrupt locking of the total station onto the cube-corner prism can be activated by remote control.
PCT/SE1995/000694 1994-06-13 1995-06-09 A method and a device for remote controlling of one or more working machines WO1995034849A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE9402047A SE9402047L (en) 1994-06-13 1994-06-13 Method and apparatus for remote control of one or more working
SE9402047-6 1994-06-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU27582/95A AU2758295A (en) 1994-06-13 1995-06-09 A method and a device for remote controlling of one or more working machines

Publications (1)

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WO1995034849A1 true WO1995034849A1 (en) 1995-12-21

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Cited By (25)

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Publication number Priority date Publication date Assignee Title
US6034722A (en) * 1997-11-03 2000-03-07 Trimble Navigation Limited Remote control and viewing for a total station
EP1418273A1 (en) * 2002-11-07 2004-05-12 Tso Method of tamping railway tracks
WO2004057269A1 (en) * 2002-12-20 2004-07-08 Trimble Ab System for surveying and a method for using the same
US7003386B1 (en) 1997-11-28 2006-02-21 Trimble Ab Device and method for determining the position of a working part
US7168174B2 (en) 2005-03-14 2007-01-30 Trimble Navigation Limited Method and apparatus for machine element control
WO2008145156A1 (en) * 2007-05-30 2008-12-04 Trimble Ab Target for use in measuring and surveying applications
US8068962B2 (en) * 2007-04-05 2011-11-29 Power Curbers, Inc. 3D control system for construction machines
WO2011133731A3 (en) * 2010-04-21 2012-04-19 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
US8467072B2 (en) 2011-02-14 2013-06-18 Faro Technologies, Inc. Target apparatus and method of making a measurement with the target apparatus
US8467071B2 (en) 2010-04-21 2013-06-18 Faro Technologies, Inc. Automatic measurement of dimensional data with a laser tracker
US8537371B2 (en) 2010-04-21 2013-09-17 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
US8724119B2 (en) 2010-04-21 2014-05-13 Faro Technologies, Inc. Method for using a handheld appliance to select, lock onto, and track a retroreflector with a laser tracker
CN103884323A (en) * 2014-04-09 2014-06-25 北京数联空间科技股份有限公司 Total station measurement method and system based on two-dimension code geographic information sign
CN104460687A (en) * 2013-09-17 2015-03-25 五冶集团上海有限公司 Electronic total station reflection prism state remote control device
US9041914B2 (en) 2013-03-15 2015-05-26 Faro Technologies, Inc. Three-dimensional coordinate scanner and method of operation
US9164173B2 (en) 2011-04-15 2015-10-20 Faro Technologies, Inc. Laser tracker that uses a fiber-optic coupler and an achromatic launch to align and collimate two wavelengths of light
US9377885B2 (en) 2010-04-21 2016-06-28 Faro Technologies, Inc. Method and apparatus for locking onto a retroreflector with a laser tracker
US9395174B2 (en) 2014-06-27 2016-07-19 Faro Technologies, Inc. Determining retroreflector orientation by optimizing spatial fit
US9400170B2 (en) 2010-04-21 2016-07-26 Faro Technologies, Inc. Automatic measurement of dimensional data within an acceptance region by a laser tracker
US9482755B2 (en) 2008-11-17 2016-11-01 Faro Technologies, Inc. Measurement system having air temperature compensation between a target and a laser tracker
US9482529B2 (en) 2011-04-15 2016-11-01 Faro Technologies, Inc. Three-dimensional coordinate scanner and method of operation
US9638507B2 (en) 2012-01-27 2017-05-02 Faro Technologies, Inc. Measurement machine utilizing a barcode to identify an inspection plan for an object
US9686532B2 (en) 2011-04-15 2017-06-20 Faro Technologies, Inc. System and method of acquiring three-dimensional coordinates using multiple coordinate measurement devices
US9772394B2 (en) 2010-04-21 2017-09-26 Faro Technologies, Inc. Method and apparatus for following an operator and locking onto a retroreflector with a laser tracker
US10302413B2 (en) 2011-04-15 2019-05-28 Faro Technologies, Inc. Six degree-of-freedom laser tracker that cooperates with a remote sensor

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US6034722A (en) * 1997-11-03 2000-03-07 Trimble Navigation Limited Remote control and viewing for a total station
US7003386B1 (en) 1997-11-28 2006-02-21 Trimble Ab Device and method for determining the position of a working part
US7139662B2 (en) 1997-11-28 2006-11-21 Trimble Ab Device and method for determining the position of a working part
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WO2008145156A1 (en) * 2007-05-30 2008-12-04 Trimble Ab Target for use in measuring and surveying applications
US7913405B2 (en) 2007-05-30 2011-03-29 Trimble Ab Target for use in measuring and surveying applications
US9453913B2 (en) 2008-11-17 2016-09-27 Faro Technologies, Inc. Target apparatus for three-dimensional measurement system
US9482755B2 (en) 2008-11-17 2016-11-01 Faro Technologies, Inc. Measurement system having air temperature compensation between a target and a laser tracker
US9377885B2 (en) 2010-04-21 2016-06-28 Faro Technologies, Inc. Method and apparatus for locking onto a retroreflector with a laser tracker
US8422034B2 (en) 2010-04-21 2013-04-16 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
US8437011B2 (en) 2010-04-21 2013-05-07 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
US10209059B2 (en) 2010-04-21 2019-02-19 Faro Technologies, Inc. Method and apparatus for following an operator and locking onto a retroreflector with a laser tracker
US8467071B2 (en) 2010-04-21 2013-06-18 Faro Technologies, Inc. Automatic measurement of dimensional data with a laser tracker
US8537375B2 (en) 2010-04-21 2013-09-17 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
US8537371B2 (en) 2010-04-21 2013-09-17 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
US8576380B2 (en) 2010-04-21 2013-11-05 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
GB2502197A (en) * 2010-04-21 2013-11-20 Faro Tech Inc Communication in laser tracking system
US9885559B2 (en) 2010-04-21 2018-02-06 Faro Technologies, Inc. Method and apparatus for following an operator and locking onto a retroreflector with a laser tracker
US9772394B2 (en) 2010-04-21 2017-09-26 Faro Technologies, Inc. Method and apparatus for following an operator and locking onto a retroreflector with a laser tracker
GB2502197B (en) * 2010-04-21 2014-01-01 Faro Tech Inc Method and apparatus for using gestures to control a laser tracker
US8654354B2 (en) 2010-04-21 2014-02-18 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
US8654355B2 (en) 2010-04-21 2014-02-18 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
GB2493481A (en) * 2010-04-21 2013-02-06 Faro Tech Inc Method and apparatus for using gestures to control a laser tracker
US8724119B2 (en) 2010-04-21 2014-05-13 Faro Technologies, Inc. Method for using a handheld appliance to select, lock onto, and track a retroreflector with a laser tracker
US8724120B2 (en) 2010-04-21 2014-05-13 Faro Technologies, Inc. Automatic measurement of dimensional data with a laser tracker
CN102906594A (en) * 2010-04-21 2013-01-30 法罗技术股份有限公司 Method and apparatus for using gestures to control laser tracker
US8896848B2 (en) 2010-04-21 2014-11-25 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
WO2011133731A3 (en) * 2010-04-21 2012-04-19 Faro Technologies, Inc. Method and apparatus for using gestures to control a laser tracker
US9007601B2 (en) 2010-04-21 2015-04-14 Faro Technologies, Inc. Automatic measurement of dimensional data with a laser tracker
US9400170B2 (en) 2010-04-21 2016-07-26 Faro Technologies, Inc. Automatic measurement of dimensional data within an acceptance region by a laser tracker
US9146094B2 (en) 2010-04-21 2015-09-29 Faro Technologies, Inc. Automatic measurement of dimensional data with a laser tracker
GB2493481B (en) * 2010-04-21 2014-03-05 Faro Tech Inc Method and apparatus for using gestures to control a laser tracker
US8593648B2 (en) 2011-02-14 2013-11-26 Faro Technologies, Inc. Target method using indentifier element to obtain sphere radius
US8467072B2 (en) 2011-02-14 2013-06-18 Faro Technologies, Inc. Target apparatus and method of making a measurement with the target apparatus
US8619265B2 (en) 2011-03-14 2013-12-31 Faro Technologies, Inc. Automatic measurement of dimensional data with a laser tracker
US9686532B2 (en) 2011-04-15 2017-06-20 Faro Technologies, Inc. System and method of acquiring three-dimensional coordinates using multiple coordinate measurement devices
US9448059B2 (en) 2011-04-15 2016-09-20 Faro Technologies, Inc. Three-dimensional scanner with external tactical probe and illuminated guidance
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