Laser-based leveling system

Abstract

The present invention relates to a laser-based leveling system. The present invention relates to a method for deriving alignment information of a surface of a structure, the alignment information comprising deviations in the alignment of the surface relative to a light plane. The method comprises: detecting, at a plurality of light receiver units, an impact position of a light plane on a light sensor having a known relative position relative to the surface; determining, for each light receiver unit and based on the impact position and the known relative position, an intersection position value of the light plane relative to the surface; performing a combined analysis of the intersection position values ​​from the plurality of light receiver units to derive alignment information comprising deviations in the alignment of the surface of the structure relative to the light plane; and displaying the alignment information to a user. The present invention also relates to a computer program product, a light receiver unit, and a system comprising a plurality of light receiver units for performing the method.

Description

Technical Field

[0001] The present invention generally relates to an electronic laser-based system for determining and indicating whether a surface of a structure is aligned relative to a given plane and for determining and indicating deviations. In particular, the system can be used to determine and indicate whether a surface is horizontal (leveled) or vertical (plumbed), and also to indicate the extent to which a surface deviates from a given plane. Background Art

[0002] The alignment of surfaces is a constant problem in various fields, from construction to interior decoration. Alignment and marking of height references are essential for walls that should be perpendicular to the floor or otherwise plumbed. Carpenters and cabinet makers are well aware of the importance of plumbing and aligning surfaces, for example when installing built-in furniture such as closets, cabinets, shelves, kitchen countertops, or stairs.

[0003] Traditionally, these tasks were performed using a spirit level. More recently, laser leveling devices are also used, which include a rotating laser beam projector that can be attached to a tripod. The beam projector is leveled depending on the accuracy of the device and projects a fixed red or green light beam in a plane (e.g. around a horizontal or vertical axis). Laser leveling devices are commonly used at construction sites and typically use a laser diode with a green or red wavelength to project a visible dot or horizontal and vertical lines on a wall, floor or ceiling. The spirit level can be manually aligned ("leveled") by guiding the projected line towards a target point so that corresponding projections at defined angles (in particular 90° and 180°) relative to the target point can be provided. Laser levels are mainly used for installing interior decoration, doors, windows, pipelines, tunnels or for inspection and engineering supervision.

[0004] In the technical field of laser leveling, a laser rotator or line laser is used to span a leveling plane, which can be horizontal, vertical, or tilted at a desired angle. The laser plane is typically detected by a laser receiver, which detects the impact position of the laser within a detection window to determine the receiver's position relative to the laser plane. The detection window or receiver window is an area of ​​a laser receiver unit that is specifically designed to detect the position of the light beam, in particular the impact point of the light beam within the detection window, in order to determine the relative position of the laser beam axis and the receiver device in at least one direction. In many embodiments, the receiver indicates deviations from the ideal position by means of an indicator or quantification device. For example, in interior fittings, such as when installing furniture, such as kitchens or interior drywall, many structures must be aligned horizontally, vertically, parallel, or perpendicular to each other. Whereas levels, carpenter's squares, chalk lines, tape measures and folding rulers were previously used, line lasers are now commonly used, as described for example in EP2930465, EP3425334, EP1192484, US2007 / 271800, WO03 / 058322, EP1519147, US6327090 or CN204963863U.

[0005] However, especially in indoor applications with confined spaces, the setup of a rotating laser beam projector may be too time-consuming and complex for the task of aligning one or more surfaces. EP3425334A1 discloses a laser level that is configured to provide a laser fan beam for projecting horizontal and vertical reference lines, and a spot beam for projecting reference points in four spatial directions.

[0006] Likewise, various different leveling receivers are known in the art.

[0007] For example, US Pat. No. 4,830,489 describes a dual-unit leveling laser receiver for linearly determining the relative height of a rotating laser beam from a laser rotator. This dual-unit leveling laser receiver uses the backreflected signal from the receiver to determine the receiver's azimuthal position at the rotator. The distance from the rotator to the receiver is measured using the time-of-flight and phase shift of the backreflected signal. Radio transmission is then used to transmit the azimuthal position and distance to the receiver.

[0008] In WO2013 / 135891, the laser receiver can be provided with a communication device, which is preferably designed for long-range wireless communication, the laser receiver being connected to a circuit so that the information derived about the movement of the laser receiver, the movement of the laser receiver relative to the laser plane, or the deviation of the laser receiver from the laser beam and the level of engagement can be sent to another unit, such as a laser transmitter that emits the detected laser beam and / or an external data analysis or control unit used by an operator to control the laser transmitter or the construction machine.

[0009] However, light receiver units known in the art are designed to be handheld or mounted to a tripod, pole or handle, which is impractical for applications where the surface is to be aligned. Summary of the Invention

[0010] It is therefore an object of the present invention to provide an improved system and an improved light receiver unit which can be easily used in surface alignment applications, in particular in applications for determining deviations of the alignment of a surface relative to a given plane.

[0011] Another object is to provide an improved system for determining the deviation of the alignment of a surface relative to a given plane.

[0012] A specific object is to provide such a system which provides fast and reliable results.

[0013] A particular object is to provide such a system which is easy to use for non-technical personnel and which can be set up without difficulty even in a small room.

[0014] Another object is to provide a light receiver unit that can be used in such a system, the given plane being the plane of emitted light.

[0015] At least one of these objects is achieved by the system according to the first aspect, the optical receiver unit according to the other aspects, the method and / or the other aspects of the invention.

[0016] A first aspect of the invention relates to a system for deriving alignment information of a surface of a structure, the alignment information comprising deviations in the alignment of the surface relative to a light plane. The system comprises a plurality of light receiver units, each of the light receiver units comprising an elongated light sensor configured to be illuminated by a light plane and to detect an impact position of the light plane, in particular an impact position relative to a zero position of the light sensor, and to provide an electrical output signal indicative of the impact position. According to this aspect of the invention, the system comprises an evaluation device configured to communicate wirelessly with at least one of the light receiver units, and each of the light receiver units comprises:

[0017] - at least one alignment surface configured to be provided at the surface of the structure for aligning the light receiver unit with the surface of the structure; and

[0018] - a first wireless communication interface configured to establish wireless communication with the evaluation device and / or with a first wireless communication interface of at least one other optical receiver unit of the system.

[0019] The intersection position value of the light plane can be determined based on the impact position for each light receiver unit. The evaluation device comprises:

[0020] - a second wireless communication interface configured to establish wireless communication with the first communication interface of at least a subset of the plurality of light receiver units and to receive data indicative of or providing the intersection position value for each of the light receiver units;

[0021] an evaluation unit configured to perform a combined analysis of the intersection position values ​​from the plurality of light receiver units and, based thereon, derive alignment information comprising the deviation in alignment of the surface of the structure relative to the light plane; and

[0022] - a display unit, wherein the evaluation device is configured to provide alignment information to a user of the system on the display unit.

[0023] According to one embodiment of the system, each of the light receiver units is formed substantially as a cube or a cuboidal shape and comprises a plurality of alignment surfaces, each of the plurality of alignment surfaces being configured to be arranged at the surface of the structure to align the light receiver unit to the surface. In particular,

[0024] - each of the light receiver units comprises at least three, or more, in particular at least five alignment surfaces;

[0025] - the alignment surface is formed to be positioned on a substantially flat surface;

[0026] - each alignment surface is substantially rectangular; and / or

[0027] Each alignment surface has a width and a length of at least 2 cm, in particular at least 3 cm.

[0028] In some embodiments, the intersection position value relates to an intersection position of the light plane relative to an alignment surface, for example wherein the intersection position value comprises a distance value, for each of the light receiver units the position of the alignment surface relative to the light sensor is known, for example at least the distance to a zero position of the light sensor, and the system comprises at least one computing unit configured to calculate the intersection position value based on the impact position and the relative position of the alignment surface.

[0029] In one embodiment, the evaluation device comprises the calculation unit and the received data provides the impact position and the relative position of the alignment surface for each of the light receiver units.

[0030] In another embodiment, each of the light receiver units comprises a calculation unit configured to calculate the intersection position of the respective light receiver unit, wherein data providing the intersection position are sent to the evaluation device.

[0031] In a further embodiment, a first of the light receiver units comprises the calculation unit, wherein data providing the relative position of the impact position and the alignment surface are sent from the other light receiver units to the first light receiver unit, and data providing the intersection position are sent from the first light receiver unit to the evaluation device.

[0032] According to another embodiment, each of the light receiver units comprises a plurality of alignment surfaces and at least one of:

[0033] - an orientation sensor configured to provide an electrical output signal indicative of the orientation of the respective light receiver unit; and

[0034] - a proximity sensor at one or more alignment surfaces, said proximity sensor being configured to provide an electrical output signal indicating whether a respective alignment surface is provided at a surface, in particular at said surface of said structure.

[0035] For example, the orientation sensor includes at least one of an accelerometer, a leveling sensor, and a compass, and the proximity sensor includes at least one of a capacitive sensor, a magnetic sensor, and an optical sensor.

[0036] According to this embodiment, the calculation unit is configured to determine which of the multiple alignment surfaces is arranged at the surface of the structure based on the output signal of the orientation sensor or the proximity sensor, and / or calculate the intersection position value based on the output signal of the orientation sensor and / or the proximity sensor.

[0037] In particular, at least one of the alignment surfaces comprises a magnet, a tripod insert or a socket for receiving a magnet and / or a tripod insert.

[0038] According to another embodiment, the light plane is a continuously emitted laser fan, and the light sensor is configured to detect the impingement position of the continuously emitted laser fan.

[0039] According to another embodiment, each of the light receiver units comprises at least two alignment surfaces, wherein the light sensor and the alignment surfaces are positioned on the respective light receiver unit in such a way that the distance to the light sensor is the same for each alignment surface, e.g. the distance to the zero position of the light sensor is the same.

[0040] According to another embodiment, the system comprises at least three light receiver units, and the evaluation unit is configured to perform a combined analysis of the intersection position values ​​from the at least three light receiver units; and to derive alignment information based on the analysis, the alignment information comprising deviations in the alignment of the surface of the structure relative to the light plane in two or three dimensions, in particular with at least four degrees of freedom.

[0041] According to another embodiment, the system comprises at least three optical receiver units, and the first wireless communication interface is configured to establish the wireless communication via Bluetooth and to establish a scatternet communication network, in particular a non-fully connected network, by network optimization, in particular to minimize and / or equalize the energy consumption of the communication of all nodes using shortest path bridging, and to extend the measurement range. This can also extend the possible range of communication between the units.

[0042] According to another embodiment of the system, at least one of the first wireless communication interfaces is configured to determine the direction and / or distance to the other first wireless communication interface by evaluating the wireless communication, and to provide direction information about the determined direction and / or distance information about the determined distance to the evaluation device, wherein the evaluation unit is configured to also derive alignment information based on the provided direction information and / or distance information.

[0043] The step of determining the direction can, for example, be based on an angle of arrival and / or angle of departure evaluation of the wireless communication, and / or include reference to an absolute orientation reference based on a gravity sensor. The step of determining the distance can, for example, be based on an energy evaluation of the distance from the wireless communication, and / or include use of a UWB communication chip. The evaluation unit can be configured to derive the relative position of the optical receiver unit from the determined direction and / or distance, wherein deriving the alignment information based on the provided direction information includes also deriving the alignment information based on the relative position.

[0044] According to another embodiment of the system, the evaluation device is configured to assign and provide a unique identifier, in particular a name, number and / or letter, to each of the light receiver units, and each of the light receiver units comprises a local display configured to display the assigned identifier. In one embodiment, the evaluation device is configured to provide the unique identifier on the display unit linked to the alignment information. In another embodiment, the evaluation device is configured to provide information about the actual positional arrangement of the light receiver units at the structure on the display unit. In a further embodiment, the evaluation device is configured to provide a user guidance function for a plurality of different alignment tasks to be selected by a user, comprising displaying the nominal positional arrangement of the light receiver units for the plurality of different alignment tasks on the display unit.

[0045] According to another embodiment, the system comprises a light emitter unit configured to emit the light plane. In particular,

[0046] - the light plane is emitted as a continuous laser fan in the direction of the light receiver unit, and the light sensor is configured to detect the impingement position of the laser fan;

[0047] - the light transmitter unit is configured to emit a vertically aligned and / or leveled oriented light fan in the direction of the light receiver unit, so that the light plane is vertically aligned or leveled oriented;

[0048] - the system is configured in such a way that the light receiver units receive light of the light planes substantially simultaneously;

[0049] - the light emitter unit is configured as a handheld light emitter unit designed to be held by a user while emitting the plane of light.

[0050] In one embodiment, the evaluation device is configured as or comprises the light emitter unit (or vice versa).

[0051] According to another embodiment of the system, the evaluation device is a handheld device, and the display unit is configured as a touch screen. For example, the evaluation device is: a handheld laser rangefinder; or a handheld light receiver unit, the handheld light receiver unit including an optical detection window configured with a light detection unit to evaluate an intersection position value of light from the light plane impinging along the detection window.

[0052] According to another embodiment of the system, at least a subset of the light receiver units comprises at least one of:

[0053] - rechargeable batteries and means allowing the batteries to be recharged, the means allowing the batteries to be recharged comprising in particular a USB socket and / or an induction coil;

[0054] - at least one local display, in particular at least two local displays, including a front display and a rear display;

[0055] at least one laser distance meter for determining a distance value from the light receiver unit to an object, in particular wherein a direction of measurement is adjustable and / or the distance value can be displayed on the local display; and

[0056] - at least one optical indicator unit configured to indicate a deviation of the alignment of the alignment surface relative to the light plane, in particular an intersection position value.

[0057] A second aspect of the present invention relates to a light receiver unit, in particular for use in a system according to the first aspect of the present invention. The light receiver unit comprises a battery and an elongated light sensor configured to be illuminated by a light plane and detect an impact position of the light plane, in particular relative to a zero position of the light sensor, and to provide an electrical output signal indicative of the impact position. According to this aspect of the invention, the light receiver unit comprises a plurality of alignment surfaces configured to be arranged on a substantially flat surface of a structure for aligning the light receiver unit with the surface of the structure; and a wireless communication interface configured to establish wireless communication with at least one other light receiver unit and with an evaluation device. The light sensor and the alignment surfaces are positioned on the respective light receiver unit in such a way that the distance to the light sensor, for example the distance to the zero position of the light sensor, is the same for each alignment surface, and an intersection position value of the light plane can be determined based on the impact position. The wireless communication interface is configured to transmit data indicative of or providing the intersection position value to the evaluation device.

[0058] A third aspect of the present invention relates to a method for deriving alignment information of a surface of a structure, in particular using a system according to the first aspect of the invention and / or a light receiver unit according to the second aspect of the invention. The alignment information comprises deviations in the alignment of the surface relative to the light plane. The method comprises at least the following steps:

[0059] - detecting, at a plurality of light receiver units, substantially simultaneously, the impingement position of the light plane on the light sensors of the respective light receiver units;

[0060] - determining, for each light receiver unit and based at least on the impact position, a value for the intersection position of the light plane relative to the surface;

[0061] - performing a combined analysis of the intersection position values ​​from the plurality of light receiver units to derive alignment information comprising deviations in alignment of the surface of the structure relative to the light plane; and

[0062] - displaying said alignment information to a user.

[0063] A fourth aspect of the present invention relates to a computer program product comprising program code stored on a machine-readable medium or a computer data signal embodied as an electromagnetic wave, the computer program product being configured to, in particular when executed in an evaluation unit of an evaluation device of a system according to the first aspect of the present invention, perform a combined analysis of the intersection position values ​​from the plurality of light receiver units to derive alignment information comprising deviations in the alignment of the surface of the structure relative to the light plane, as part of a method according to the third aspect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The present invention will now be described in detail with reference to exemplary embodiments accompanied by the accompanying drawings, in which:

[0065] Figure 1 A first exemplary embodiment of a system for determining a deviation of an alignment of a surface from a plane according to the present invention is shown;

[0066] Figure 2 A first exemplary embodiment of an optical receiver unit according to the present invention is shown;

[0067] Figure 3 A second exemplary embodiment of the system according to the invention is shown;

[0068] Figure 4a shows the front side of a second exemplary embodiment of an optical receiver unit according to the invention;

[0069] Figure 4b Shown Figure 4aa rear side of the light receiver unit;

[0070] Figure 5a A third exemplary embodiment of the system according to the invention is shown;

[0071] Figure 5b A fourth exemplary embodiment of a system according to the invention is shown;

[0072] Figure 5c A fifth exemplary embodiment of a system according to the invention is shown;

[0073] Figure 6 A flow chart showing an exemplary embodiment of the method according to the present invention;

[0074] Figure 7 shows the distribution of components in a sixth exemplary embodiment of the system according to the invention;

[0075] Figure 8 shows the distribution of components in a seventh exemplary embodiment of the system according to the invention; and

[0076] Figure 9 The distribution of components in an eighth exemplary embodiment of the system according to the invention is shown. DETAILED DESCRIPTION

[0077] Figure 1 An exemplary embodiment of a system 1 for determining a deviation from the alignment of a surface 50 with a light plane 30 is depicted. The surface 50 belongs to a structure 5 (such as a piece of furniture), and in this example is a work surface on top of a cabinet. The light plane 30 is emitted by a handheld light emitter unit 3 in the form of a laser fan. Optionally, the light emitter unit can be configured to be mounted, for example, on a tripod, a wall, or a ceiling. The light emitter unit 3 can be configured to emit the light fan in a direction that depends on the unit's posture. In this way, the direction can be defined by the user holding or mounting the light emitter unit 3.

[0078] Additionally or alternatively, the light emitter unit 3 can be configured to emit a fan of light in a corrected direction that is independent of its posture (e.g., in a vertical direction or (as shown herein) in a horizontal direction). In this way, the handheld light emitter unit can be used to define a plane at least relative to the posture (e.g., with roll and yaw as two defined degrees of freedom). If the height is known or unimportant, this can be used, for example, to align a surface with a horizontal plane.

[0079] System 1 also includes three light receiver units 10 positioned on surface 50. Each of the light receiver units includes a light sensor configured to be illuminated by light plane 30 emitted by light emitter unit 3 and to detect the impact position of the light from the light plane on the light sensor (e.g., relative to the zero position of the light sensor). Alternatively, depending on the constraints, a 2D measurement setup can be performed using two sensors. An electrical output signal indicating the impact position is then generated by the sensor and transmitted to evaluation device 2 via a wireless communication signal (e.g., via Bluetooth). Other information transmission technologies can be used, depending on the setup, such as optical signal transmission (including, for example, LEDs, IR-LEDs, etc.).

[0080] In the example shown, the light plane 30 is a continuously emitted laser fan that simultaneously illuminates the light sensors of three light receiver units. The light sensors are configured to detect the impact position of the continuously impinging light. The term continuously emitted laser fan should be understood to also include pulsed laser fans that pulse in the kHz range or higher (e.g., 10 kHz or higher), i.e., appear as a stable (and non-moving) laser fan.

[0081] For alignment of the light receiver units 10 with the surface 50, each of the light receiver units includes one or more alignment surfaces configured to establish a defined positional relationship between the surface 50 and the light sensor (e.g., a zero position). The defined positional relationship may be known or the same (or both) for each light receiver unit.

[0082] In this exemplary embodiment, evaluation device 2 is a smartphone on which a computer program application ("app") is installed that provides evaluation functionality for data received from light receiver unit 10 via wireless communication 6. Evaluation device 2 is configured to analyze the received data and, based thereon, derive alignment information about the alignment of surface 50 relative to the light plane, i.e., whether they are aligned, and, if not, how the actual orientation and position of surface 50 deviates from the nominal orientation and position given by light plane 30. The smartphone includes a display unit 20 embodied as a touchscreen and allowing the alignment information to be provided to a user of the system. The user can then determine whether and how the position and / or orientation of structure 5 needs to be adjusted to align it with the light plane, i.e., in the example shown, to level surface 50 so that it is horizontal.

[0083] The evaluation device can be any device that has a software application (e.g., a smartphone app) installed to perform the described functions and utilize existing suitable components of the device. The term "evaluation device" does not necessarily apply to a single device or to any device at all. Instead, the term should be understood in such a way that the components and / or functions of the described evaluation device 2 can be divided between two or more units. Furthermore, the term "evaluation device" can refer to a software application that can be installed on a general-purpose device and utilizes existing suitable components to perform the described functions.

[0084] Figure 2 Shown Figure 1 The system 1 includes a light receiver unit 10. The unit includes at least one alignment surface 15 for positioning the light receiver unit 10 on a surface and aligning the unit with the surface. In the example shown, there are two alignment surfaces 15 and 15'. An elongated light sensor 13, which may be configured as a line sensor, has a zero position 14, for example, indicating the center of the sensor 13. The impact position of the light plane 30 can be detected by the light sensor 13, for example, as shown here, at a distance from the zero position 14.

[0085] The position of light sensor 13 relative to alignment surface 15 (and therefore relative to the surface on which alignment surface 15 is located) is known. In the illustrated embodiment, this relative position includes at least the distance from zero position 14 to alignment surface 15. Based on impact position 71 and known relative position 72, an intersection position value 70 of light plane 30 relative to the surface can be derived, for example by adding the two distance values. Data indicating intersection position value 70 of this light receiver unit 10 is transmitted via a wireless signal (e.g., Bluetooth) to an evaluation device, where the data from a plurality of such light receiver units 10 is analyzed. Alternatively, the analysis can be performed by an evaluation unit of the light receiver units 10.

[0086] In some embodiments, an intersection position value 70 is determined in the light receiver unit 10, and the transmitted data includes the intersection position value 70. Alternatively, the impact position 71 and, optionally, the known relative position 72 can be transmitted. If the light receiver unit 10 includes only one alignment surface 15 and the relative position 72 to the alignment surface 15 is known to the evaluation device, only the impact position needs to be transmitted. If the light receiver unit 10 includes more than one alignment surface 15, an indication of which alignment surface 15 is aligned with the surface may also need to be transmitted to the evaluation device.

[0087] If the relative position 72 is unknown, the alignment of the surface can still be determined from the pose if the relative position 72 is the same in a plurality of light receiver units 10. In this case, the impact position 71 is equal to the intersection position value 70.

[0088] In a preferred embodiment, the relative position between the zero position 14 and the two alignment surfaces 15, 15' is the same. Thus, it is unimportant which of the alignment surfaces is used to align the light receiver unit 10 to a surface.

[0089] In order to align with a (substantially) flat surface, the alignment surfaces 15, 15' may also be flat. In order to prevent floating or sliding on an inclined surface, or while adjusting the inclination of the surface, the alignment surfaces 15, 15' may be rubberized or include magnets or similar devices. In addition, the overall dimensions of the light receiver unit 10 should be selected to prevent tilting or flipping. For example, a cube or a substantially cube-shaped shape (or a similar shape, such as a box or a right prism (e.g., a cuboid or generally a right prism, the base of which is a regular n-sided polygon, including a triangular base)) can be used for the light receiver unit 10 and a (rectangular or square) alignment surface to prevent this, the individual edges of the alignment surface being at least 2 cm in length, in particular 3 cm or more.

[0090] A plurality of differently shaped or structured alignment surfaces may be used to align the unit to differently shaped or structured surfaces.

[0091] Figure 3 Another exemplary embodiment of a system 1 for determining a deviation from the alignment of a surface 50 of a structure 5 with a light plane 30 is shown. The system 1 includes a light emitter unit 3 configured to generate the light plane 30. The light emitter unit 3 can be fixedly mounted to a wall, ceiling, or tripod to emit the same light plane 30 for a longer period of time, for example, until the structure 5 has been positioned so that its surface 50 is aligned with the light plane 30. Alternatively or additionally, the light emitter unit 3 can be configured to be held in the hand of a user while the light plane 30 is emitted in the direction of the surface 50. Three (or more) light receiver units have been positioned by the user on the surface 50 to receive the light plane 30.

[0092] The user can be assisted in positioning the light receiver units by means of the handheld evaluation device 2, which can provide on its display unit 20 a nominal position arrangement of the first and second light receiver units 10 a, 10 b for a number of different alignment tasks selected by the user in a menu provided by the evaluation device 2. These alignment tasks include at least aligning a surface with respect to vertical and horizontal.

[0093] The first photoreceiver unit can be configured as the master unit 10a of the group of photoreceiver units, with the other photoreceiver units being configured as slave units 10b. In the illustrated arrangement, this means that only the master unit 10a has means for establishing an external wireless signal 6a with the evaluation device 2. The slave units 10b are configured to communicate with the master unit 10a, and optionally with each other, via an internal wireless signal 6b. Thus, they transmit data indicating their intersection position values ​​to the master unit 10a via the internal wireless signal 6b. The master unit 10a then passes the data from all units 10a, 10b, to the evaluation device 2, where it is analyzed.

[0094] The alignment data of the surface 50 relative to the light plane 30 may then be displayed on the display unit 20 , for example including a virtual bubble level 29 .

[0095] One or more of the first and second light receiver units 10a, 10b may include a wireless communication interface configured to evaluate an internal wireless signal 6b between the first and second light receiver units 10a, 10b in order to determine a direction and / or distance between the first and second light receiver units 10a, 10b. Data regarding the determined direction and / or distance may then be sent to the evaluation device 2, where the data may be used to derive improved alignment information for the surface 50. The evaluation unit of the evaluation device 2 may be configured to derive the relative position of the first and second light receiver units 10a, 10b from the determined direction and / or distance. The step of deriving alignment information may then include deriving alignment information based also on the relative position.

[0096] For example, the direction can be determined based on an assessment of a generally known angle of arrival or angle of departure of the internal wireless signal 6b. Furthermore, determining the direction can include referencing the direction to an absolute orientation reference based on a gravity sensor. Distance can be determined based on a distance-by-energy assessment of wireless communication. Furthermore, determining the distance can include using an ultra-wideband (UWB) communication chip.

[0097] Figure 4a and Figure 4b The front and back sides of an exemplary embodiment of a light receiver unit 10 according to the present invention are shown. Figure 4a The front side is shown, ie the side comprising the light sensor 13. Two alignment surfaces of the unit can be seen here, a bottom alignment surface 15 and a top alignment surface 15'. An indication of the zero position 14 of the light sensor can be provided as a reference line.

[0098] The light receiver unit 10 includes a front display 11a for providing information about the unit, its relative position, measurements provided to the user by the evaluation unit, and / or values. Optionally, the device may include a leveling sensor, and the data generated by the leveling sensor may be provided on the display 11a, for example, as a digital level. Furthermore, an audible indicator may be provided, for example to indicate that a light signal has been received by the light sensor 13 or to provide an error message.

[0099] The optical receiver unit 10 further comprises a wireless communication unit 16 , for example comprising a Bluetooth module and / or an ultra-wideband (UWB) module, for communicating with other optical receiver units and / or evaluation devices.

[0100] Preferably, the unit is battery operated, although electrical energy can also be provided by means of a cable, for example via a USB socket 18. The USB socket 18 can also be used to charge the battery or for exchanging data with other optical receiver units or evaluation devices.

[0101] Optionally, the light receiver unit 10 may include a laser distance meter 17 configured to derive a distance value from the light receiver unit to an object. This can be used to determine the distance between light receiver units or between a surface and another object (such as the surface of a structure to be aligned). The laser distance meter 17 may be provided with an adjustable measuring direction, for example, tiltable or otherwise movable. The measured distance may be displayed on a display 11 a and / or sent to an evaluation device.

[0102] The unit further comprises an optical indicator configured as part of the display 11a or (as shown here) as an optical indicator unit 12, which is configured to indicate the deviation of the alignment of the currently used alignment surface 15, 15' relative to the light plane. This indication can be based on an intersection position value that has been derived in the unit or in the evaluation device and sent back via a wireless signal. If the light plane is continuously emitted, the information of the optical indicator unit 12 can be updated in real time. This informs the user how to adjust the surface at this position, thereby advantageously facilitating the adjustment of the posture of the structure (for example, with two or three rotational degrees of freedom and two or three translational degrees of freedom (4DOF or 6DOF)) in order to align the surface with the light plane.

[0103] Some or all of the alignment surfaces 15, 15' may include one or more magnets 19 or other means for fixedly aligning the alignment surfaces 15, 15' to a surface (e.g., below or vertically). A tripod socket (not shown here) may also be provided at the alignment surfaces 15, 15'. Additionally or alternatively, a socket configured only to receive a magnet and / or a tripod plug may be integrated into the alignment surfaces 15, 15'.

[0104] Figure 4b Shown Figure 4a The rear side of the light receiver unit 10 is configured as a further alignment surface 15″ and comprises four magnets 19, which fixedly attach the unit at the magnetic surface. The unit comprises a rear display 11 b, which may comprise the same functionality as the front display 11 a. Alternatively or additionally, further displays not shown here may be provided on other sides of the light receiver unit 10 - in particular if the light receiver unit is cuboid-shaped - as top, bottom or side displays, for example.

[0105] Furthermore, other features of the front side, such as the second optical indicator unit 12 or the second light sensor 13, may be provided on the rear side of the unit. Furthermore, other sides besides the rear side may comprise some or all of the features of the front or rear side of the unit shown here.

[0106] Figure 5a 、 Figure 5b and Figure 5c Three exemplary embodiments of the system 1 are illustrated. Each system comprises an evaluation device 2 having a display unit 20 on which alignment information can be displayed, for example including a virtual bubble level 29 .

[0107] exist Figure 5a In the system 1 , three optical receiver units 10 communicate directly with the evaluation device 2 using wireless communication signals.

[0108] exist Figure 5b In the system 1, the first optical receiver unit 10a uses an external wireless signal 6a to communicate directly with the evaluation device 2. Two additional optical receiver units 10b use an internal wireless signal 6b to communicate with the first optical receiver unit 10a. The first optical receiver unit 10a acts as a master device, and the additional optical receiver units 10b act as slave units in the system 1 shown. The slave units 10b send their data to the master unit 10a, which, optionally pre-evaluated, sends the data of all the first and second optical receiver units 10a, 10b to the evaluation device 2.

[0109] Figure 5c System 1 includes Figure 5b The system has the same master and slave configuration as the one described above and is further configured to establish a scatternet communication network 6c with additional optical receiver units 10c. The scatternet communication network 6c can be conceived as a partially connected network, a piconet, or a mesh network. Network optimization can be used to minimize or balance energy consumption for communication between units, for example, by utilizing shortest path bridging.

[0110] Figure 6Shown is a flow chart illustrating an exemplary embodiment of a method 100 according to the present invention for deriving alignment information of a surface using the above-described system. The alignment information relates to the deviation of the alignment of the surface relative to a user-defined plane.

[0111] The illustrated method 100 begins with a user positioning a light receiver unit 110 on a surface to be aligned. As described above, the light receiver units each have an alignment surface that allows the unit to be aligned to the surface. The user defines 120 a plane to which the surface should be aligned, and correspondingly positions a laser emitter device to emit 130 a light plane, such as a laser plane, along the user-defined plane.

[0112] The steps of defining 120 the plane and positioning 110 the light receiver unit may be performed in any order. Emitting 130 the light plane before positioning 110 the light receiver unit may facilitate positioning and orienting the surface (or the structure to which the surface belongs) approximately in the desired position so that illumination of the light receiver unit by the emitted light plane is ensured.

[0113] In some embodiments, the following steps 140 , 150 , 160 and 170 of the method may be performed without any user interaction, ie, fully automatically by the system.

[0114] If the light receiver units have been positioned correctly, the light sensor of each of the light receiver units is illuminated by the light plane so that the impingement position of the light plane on the sensor is detected 140 .

[0115] Based on the detected impact position and the known position of the light sensor relative to the alignment surface, an intersection position value of the light plane relative to the surface may be determined 150 for each light receiver unit.

[0116] The plurality of intersection position values ​​are analyzed 160 to derive alignment information for the surface. This alignment information is then displayed 170 to the user to inform the user whether and how to adjust 180 the surface alignment—for example, by moving the structure and / or modifying the height of one or more of its supports. The method (or portions thereof) can then be repeated iteratively until the surface is fully aligned with the user-defined plane—or at least sufficiently aligned for a given purpose. In the example shown, the laser plane is continuously emitted 130 so that after adjusting 180 the surface, the method continues to detect 140 new impact locations on the light receiver unit.

[0117] Figure 7 、 Figure 8 and Figure 9Each shows a schematic representation of an exemplary embodiment of a system 1 according to the invention, illustrating the distribution of certain components between the devices. In each of the three embodiments, the system comprises an evaluation device and three optical receiver units.

[0118] exist Figure 7 , each of the optical receiver units 10 includes a wireless communication unit 16 that communicates directly with the evaluation device 2 via wireless communication signals. The evaluation device 2 includes a corresponding wireless communication unit 26. Optionally, the wireless communication units 16 of the optical receiver units 10 may also be configured to communicate with each other via an internal wireless signal 6b.

[0119] Each of the three light receiver units 10 also includes a light sensor 13 , a display 11 , and an orientation sensor 40 .

[0120] The light sensor 13 is configured to detect the impact position and the display 11 is configured to provide information about the respective light receiver units 10 , their relative positions, measurements and / or values ​​provided to the user by the evaluation unit.

[0121] The orientation sensor 40 is configured to provide an electrical output signal indicating the orientation of the corresponding light receiver unit 10. The orientation sensor 40 may, for example, include an accelerometer or a leveling sensor, and optionally a compass. For example, the electrical output signal of the orientation sensor can be used to indicate which of a plurality of alignment surfaces is currently aligned with the surface. For example, if the alignment task involves positioning the light receiver unit 10 on top of a surface, the alignment surface used would be the alignment surface located on the bottom of the light receiver unit. Because the relative position of the light sensor can be different for each alignment surface, this information can be used to determine the intersection position value.

[0122] The evaluation device 2 comprises a display unit 20 , an evaluation unit 21 and a calculation unit 22 .

[0123] The calculation unit 22 is configured to calculate an intersection position value based on the impact position and the relative position of the alignment surface. Thus, the data received from the light receiver units 10 provide the impact position and the relative position of the alignment surface for each of the light receiver units 10. The evaluation unit 21 is configured to perform a combined analysis of the intersection position values ​​from the plurality of light receiver units and, based thereon, derive alignment information for the surface to be aligned. The display unit 20 is configured to display the alignment information to a user of the system 1.

[0124] exist Figure 8In FIG, the three optical receiver units include a first optical receiver unit 10a (master unit) and two second optical receiver units 10b (slave units). Only the master unit 10a communicates directly with the evaluation device 2 (external wireless signal 6a), while the slave units 10b communicate only with the master unit 10a and optionally with each other (internal wireless signal 6b). In other respects, the distribution of components is similar to Figure 7 The same as in the system 1. Thus, the slave unit 10b sends the impact position it has detected - and possibly further information required for calculating the intersection position value - to the master unit 10a. The master unit 10a sends all information to the evaluation device 2.

[0125] exist Figure 9 In FIG, the three optical receiver units include a first optical receiver unit 10a (master unit) and two second optical receiver units 10b (slave units). Figure 7 and Figure 8 Compared to the embodiment of the present invention, the first light receiver unit 10a includes a calculation unit 42 configured to calculate an intersection position value based on the impact position and the relative position of the alignment surface. Therefore, the slave unit 10b provides its impact position to the master unit 10a, which calculates the intersection position value of each of the first and second light receiver units 10a, 10b in its calculation unit 4 and sends the intersection position value to the evaluation device 2 via the external wireless signal 6a.

[0126] Thus, the data received from the light receiver unit 10 provides the impact position for each of the first and second light receiver units 10a, 10b and the relative position of the alignment surface. The evaluation unit 21 is configured to perform a combined analysis of the intersection position values ​​from the plurality of light receiver units and, based thereon, derive alignment information for the surface to be aligned. The display unit 20 is configured to display the alignment information to a user of the system 1.

[0127] The first light receiver unit 10a further includes one or more laser rangefinders 17 configured to determine the distance and direction to a distant object. The laser rangefinders 17 can be used, for example, in conjunction with an orientation sensor, to determine the position of the slave unit 10b relative to the master unit 10a. These relative positions can be provided to the evaluation device 2 via an external wireless signal 6a to be taken into account when determining alignment information. Alternatively or additionally, the one or more laser rangefinders 17 can be used to arrange the first and second light receiver units 10a, 10b on a surface according to a nominal arrangement provided by the evaluation device 2 as a user guide (e.g., on the display unit 20 of the evaluation device 2 and / or the display units 11 of the first and second light receiver units 10a, 10b).

[0128] Instead of an orientation sensor 40 configured to provide an electrical output signal indicating the orientation of a respective one of the first and second light receiver units 10a, 10b, some or all of the first and second light receiver units 10a, 10b may include proximity sensors 41 at one or more of the alignment surfaces. These proximity sensors 41 are configured to provide an electrical output signal indicating whether the respective alignment surface is positioned at the surface. The proximity sensors 41 may include capacitive sensors, magnetic sensors, and / or optical sensors. The calculation unit 42 is then configured to use the output signals of the proximity sensors 41 to determine which alignment surface of the respective one of the first and second light receiver units 10a, 10b is currently positioned at the surface. Furthermore, an intersection position value may then be calculated based on the output signals of the proximity sensors 41.

[0129] The evaluation device 2 and the light transmitter unit 3 can be configured as one device, in particular a handheld device comprising both functions. In the example shown, the evaluation device 2 comprises the light transmitter unit 3. Of course, the light transmitter unit 3 can be configured as the evaluation device 2 and / or comprise all components of the evaluation device 2.

[0130] Although the present invention has been described above in part with reference to some preferred embodiments, it should be understood that various modifications and combinations of the different features of the embodiments are possible, all of which fall within the scope of the appended claims.

Claims

1. A system (1) for deriving alignment information of a surface (50) of a structure (5), the alignment information comprising a deviation in alignment of the surface (50) relative to a light plane (30), the system (1) comprising a plurality of light receiver units (10), each light receiver unit comprising an elongated light sensor (13), the elongated light sensor (13) being configured to be illuminated by the light plane (30) and to detect an impact position (71) of the light plane and to provide an electrical output signal indicative of the impact position (71), It is characterized by: The system comprises an evaluation device (2) configured to communicate wirelessly (6) with at least one of the optical receiver units (10), wherein Each of the optical receiver units (10) comprises: at least one alignment surface (15) configured to be provided at the surface (50) of the structure (5) to align the light receiver unit (10) to the surface of the structure, and a first wireless communication interface (16) configured to establish wireless communication (6) with a first wireless communication interface of the evaluation device (2) and / or at least one other optical receiver unit (10) of the system; The intersection position value (70) of the light plane (30) can be determined based on the impact position (71) for each light receiver unit (10); and The evaluation device (2) comprises: a second wireless communication interface (26) configured to establish wireless communication (6) with the first wireless communication interface (16) of at least a subset of the plurality of light receiver units (10) and receive data indicating or providing the intersection position value (70) for each of the light receiver units (10), an evaluation unit (21) configured to perform a combined analysis of the intersection position values ​​(70) from the plurality of light receiver units (10) and to derive therefrom the alignment information comprising the deviation of the alignment of the surface (50) of the structure (5) relative to the light plane (30), and A display unit (20), wherein the evaluation device (2) is configured to provide the alignment information to a user of the system (1) on the display unit (20).

2. The system (1) according to claim 1, wherein The elongated light sensor (13) is configured to detect an impact position (71) of the light plane relative to a zero position (14) of the light sensor (13).

3. The system (1) according to claim 1, wherein Each of the light receiver units (10) is formed substantially as a cube or a cuboidal shape and comprises a plurality of alignment surfaces (15, 15', 15"), each of the plurality of alignment surfaces being configured to be disposed at the surface (50) of the structure (5) to align the light receiver unit (10) to the surface of the structure.

4. The system (1) according to claim 3, wherein Each of the light receiver units (10) comprises at least three alignment surfaces, The alignment surface is formed to be positioned on a substantially flat surface, Each alignment surface is substantially rectangular, and / or Each alignment surface has a width and a length of at least 2 cm.

5. The system (1) according to claim 4, wherein Each of the light receiver units (10) includes at least five alignment surfaces.

6. The system (1) according to claim 4, wherein Each alignment surface has a width and a length of at least 3 cm.

7. The system (1) according to any one of claims 1 to 6, wherein: The intersection position value (70) relates to an intersection position of the light plane (30) relative to the alignment surface (15); For each of the light receiver units (10), the position of the alignment surface (15) relative to the light sensor (13) is known; and The system (1) comprises at least one calculation unit (22, 42) configured to calculate the intersection position value (70) based on the relative position of the impact position (71) and the alignment surface (15), in The evaluation device (2) comprises the calculation unit (22), and the received data provides the impact position and the relative position of the alignment surface for each of the light receiver units (10); or Each of the light receiver units (10) comprises a calculation unit (42) configured to calculate the intersection position of the respective light receiver unit, wherein data providing the intersection position are sent to the evaluation device (2); or A first light receiver unit (10a) of the light receiver units (10) comprises the calculation unit (42), wherein data providing the relative position of the impact position and the alignment surface are sent from the other light receiver units (10b) to the first light receiver unit (10a), and data providing the intersection position are sent from the first light receiver unit (10a) to the evaluation device (2).

8. The system (1) according to claim 7, wherein The intersection position value (70) includes a distance value.

9. The system (1) according to claim 7, wherein At least the distance (72) to the zero position (14) of the light sensor (13) is known.

10. The system (1) according to claim 7, wherein Each of the light receiver units (10) comprises a plurality of alignment surfaces (15, 15', 15"), wherein each of the light receiver units (10) comprises: an orientation sensor (40) configured to provide an electrical output signal indicative of the orientation of the corresponding light receiver unit (10); and / or a proximity sensor (41) at one or more alignment surfaces (15, 15', 15"), the proximity sensor being configured to provide an electrical output signal indicating whether the respective alignment surface (15, 15', 15") is placed at the surface, Wherein, the computing unit (22, 42) is configured to: determining which of the plurality of alignment surfaces (15, 15', 15") is placed at the surface (50) of the structure (5) based on the output signals of the orientation sensor (40) and / or the proximity sensor (41), and / or The intersection position value (70) is calculated based on the output signals of the orientation sensor (40) and / or the proximity sensor (41).

11. The system (1) according to claim 10, wherein The electrical output signal indicates whether the corresponding alignment surface (15, 15', 15") is placed at the surface (50) of the structure (5).

12. The system (1) according to claim 10, wherein The orientation sensor (40) includes at least one of an accelerometer, a leveling sensor, and a compass; The proximity sensor (41) includes at least one of a capacitive sensor, a magnetic sensor, and an optical sensor; and / or At least one of the alignment surfaces (15) includes at least one of a magnet (19), a tripod insert, and a socket for receiving the magnet and / or the tripod insert.

13. The system (1) according to claim 1, wherein The light plane (30) is a continuously emitted laser fan, and the light sensor (13) is configured to detect an impact position (71) of the continuously emitted laser fan; and / or Each of the light receiver units (10) comprises at least two alignment surfaces (15, 15'), wherein The light sensors (13) and the alignment surfaces are positioned on the respective light receiver units (10) in such a way that the distance to the light sensors (13) is the same for each alignment surface.

14. The system (1) according to claim 13, wherein The distance (72) to the zero position (14) of the light sensor (13) is the same for each alignment surface.

15. The system (1) according to claim 1, comprising at least three optical receiver units (10), wherein The evaluation unit (21) is configured to: performing a combined analysis of the intersection position values ​​(70) from the at least three light receiver units (10), and Based on the analysis, alignment information is derived, which includes deviations in the alignment of the surface (50) of the structure (5) relative to the light plane (30) in two or three dimensions.

16. The system (1) according to claim 15, wherein The alignment information comprises deviations with at least four degrees of freedom of alignment of the surface (50) of the structure (5) relative to the light plane (30) in two or three dimensions.

17. The system (1) according to claim 1, comprising at least three optical receiver units (10), wherein: The first wireless communication interface (16) is configured to establish the wireless communication (6) via Bluetooth and to establish a scatternet communication network by network optimization configured to minimize and / or balance energy consumption of communications of all nodes and / or to extend a measurement range.

18. The system (1) according to claim 17, wherein The scatternet communication network is configured as a non-fully connected network.

19. The system (1) according to claim 17, wherein The network optimization is configured to minimize and / or balance energy consumption of communications across all nodes using shortest path bridging.

20. The system (1) according to claim 1, wherein At least one of the first wireless communication interfaces (16) is configured to: determining the direction and / or distance to the further first wireless communication interface by evaluating the wireless communication, and providing direction information about the determined direction and / or distance information about the determined distance to the evaluation device (2); and The evaluation unit is configured to derive alignment information further based on the provided direction information and / or distance information.

21. The system (1) according to claim 20, wherein The step of determining the direction is based on an evaluation of an angle of arrival and / or angle of departure of said wireless communication and / or comprises referencing the direction to an absolute orientation reference based on a gravity sensor; and / or The step of determining the distance is based on a distance energy assessment of said wireless communication and / or includes using a UWB communication chip; and / or The evaluation unit is configured to derive the relative position of the light receiver unit (10) from the determined direction and / or distance, wherein the step of deriving the alignment information based on the provided direction information comprises also deriving the alignment information based on the relative position.

22. The system (1) according to claim 1, wherein The evaluation device (2) is configured to: each of the optical receiver units (10) is assigned and provided with a unique identifier, and each of the optical receiver units (10) comprises a local display (11) configured to display the assigned identifier; and / or providing information on the actual positional arrangement of the light receiver unit (10) at the structure (5) on the display unit (20); and / or A user guidance function is provided for a plurality of different alignment tasks to be selected by a user, comprising displaying on the display unit (20) nominal position arrangements of the light receiver unit (10) for the plurality of different alignment tasks.

23. The system (1) according to claim 22, wherein The identifier includes a name, numbers and / or letters.

24. The system (1) according to claim 22, wherein The evaluation device (2) is configured to provide the unique identifier on the display unit (20) linked to the alignment information.

25. The system (1) according to claim 1, comprising a light emitter unit (3) configured to emit the light plane (30).

26. The system (1) according to claim 25, wherein The light plane (30) is emitted as a continuous laser fan in the direction of the light receiver unit (10), and the light sensor (13) is configured to detect the impact position (71) of the laser fan; The light transmitter unit (3) is configured to emit a vertically aligned light fan and / or a levelingly aligned light fan in the direction of the light receiver unit (10), so that the light plane (30) is vertically aligned or levelingly aligned; The system is configured in such a way that the light receiver units (10) receive light from the light plane (30) substantially simultaneously; The light emitter unit (3) is configured as a handheld light emitter unit designed to be held by the user while emitting the light plane (30); and / or The evaluation device (2) is configured as or comprises the light emitter unit (3).

27. The system (1) according to claim 1, wherein The evaluation device (2) is a handheld device, and the display unit (20) is configured as a touch screen.

28. The system (1) according to claim 27, wherein The evaluation device (2) is: Handheld laser rangefinder, or A handheld light receiver unit comprises an optical detection window configured with a light detection unit to evaluate an intersection position value of an impingement of light of the light plane along the detection window.

29. The system (1) according to claim 1, wherein At least a subset of the optical receiver units (10) includes at least one of the following: Rechargeable batteries and devices allowing the charging of batteries; at least one local display (11); at least one laser rangefinder (17) for deriving a distance value from the light receiver unit to an object; At least one optical indicator unit (12) configured to indicate a deviation in the alignment of the alignment surface (15) relative to the light plane (30).

30. The system (1) according to claim 29, wherein The means allowing the battery to be charged include a USB socket (18) and / or an induction coil.

31. The system (1) according to claim 29, wherein The at least one local display (11) is at least two local displays, including a front display (11a) and a rear display (11b).

32. The system (1) according to claim 29, wherein The direction of measurement can be adjusted, and / or the distance value can be displayed on the local display (11).

33. The system (1) according to claim 29, wherein The at least one optical indicator unit (12) is configured to indicate the intersection position value (70).

34. A light receiver unit (10) for use in a system (1) according to any one of claims 1 to 33, the light receiver unit (10) comprising a battery and an elongated light sensor (13), the elongated light sensor (13) being configured to be illuminated by a light plane (30) and to detect an impact position (71) of the light plane and to provide an electrical output signal indicative of the impact position (71), It is characterized by a plurality of alignment surfaces (15, 15', 15") configured to be placed at a substantially flat surface (50) of a structure (5) to align the light receiver unit (10) to the surface of the structure, and The wireless communication interface (16) is configured to establish wireless communication (6) with at least one other optical receiver unit (10) and with the evaluation device (2), in The light sensor (13) and the alignment surfaces (15, 15', 15") are positioned on the respective light receiver unit (10) in such a way that the distance to the light sensor (13) is the same for each alignment surface, An intersection position value (70) of the light plane (30) can be determined based on the impact position (71), and The wireless communication interface is configured to send data indicating or providing the intersection position value (70) to the evaluation device (2).

35. The optical receiver unit (10) of claim 34, wherein The elongated light sensor (13) is configured to detect an impact position (71) of the light plane relative to a zero position (14) of the light sensor (13).

36. The optical receiver unit (10) of claim 34, wherein The distance (72) to the zero position (14) of the light sensor (13) is the same for each alignment surface.

37. A method (100) for deriving alignment information of a surface (50) of a structure (5), the alignment information comprising a deviation in alignment of the surface (50) relative to a light plane (30), the method comprising: substantially simultaneously detecting (140) at a plurality of light receiver units (10) according to claim 34 the impact position (71) of the light plane (30) on the light sensors (13) of the respective light receiver units (10), determining (150) for each light receiver unit (10) and based at least on the impact position (71) an intersection position value (70) of the light plane (30) relative to the surface (5), performing a combined analysis (160) of the intersection position values ​​(70) from the plurality of light receiver units (10) to derive alignment information comprising deviations in alignment of the surface (50) of the structure (5) relative to the light plane (30), and The alignment information is displayed (170) to a user.

38. A computer program product comprising program code stored on a machine-readable medium, the computer program product being configured to, when executed in an evaluation unit (21) of an evaluation device (2) of a system (1) according to any one of claims 1 to 33, perform a combined analysis (160) of the intersection position values ​​(70) from the plurality of light receiver units (10) to derive alignment information comprising deviations in the alignment of the surface (50) of the structure (5) relative to the light plane (30), as part of the method according to claim 37.

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