Abstract: The present invention relates to a system and method for reconstruction of temporal wavefront changes for use in an optical system comprising: measuring the distribution function of the light intensity, e.g. the two-dimensional distribution function of the light intensity, in at least two different images taken at different times, wherein said images are taken in at least one optical plane, e.g. the same optical plane, of the optical system.

Abstract: An ophthalmic laser surgical system has a built-in imaging sensor for measuring laser focal spot size. An objective lens focuses the laser beam to a focal spot near a reflective surface, scans the focal spot in the depth direction, and focuses light reflected by the reflective surface to form a back-reflected light. A two-dimensional imaging sensor receives a sample of the back-reflected light to generate images of the back-reflected light. During the depth scan, the image contains a well-focused light spot when the laser focal spot is located at a fixed offset distance before the reflective surface, but the light spot in the images is otherwise defocused. The images generated during the scan are analyzed to find the smallest light spot size among the images. The laser focal spot size is then calculated from the smallest light spot size using a magnification factor which is a system constant.

Abstract: A method for determining wavefront shapes of a multi-spectral signal light beam from a single signal image acquisition of said multi-spectral signal beam, with a device including an optical assembly made at least of an optical mask and an imaging sensor, notably a matrix imaging sensor, for generating and recording intensity patterns of incident beams, by having these beams reflect on, or propagate through, the optical mask. The optical mask having the optical properties: i) to cause the intensity pattern to depend on the wavefront shape, so that a tilt applied to the wavefront shape results in a displacement amount of the intensity pattern, and ii) to produce uncorrelated intensity patterns over at least one surface area A of the imaging sensor, for a plurality of respective incident monochrome beams of different wavelengths having a same wavefront shape.

Abstract: A laser beam applying unit of a laser processing apparatus includes a beam splitter disposed on a first optical path connecting a laser oscillator and a condenser, a wide band light source disposed on a second optical path branched by the beam splitter, a spectroscope that is disposed between the wide band light source and the beam splitter and that branches the laser beam from the second optical path to a third optical path, and a Z position detection unit that is disposed on the third optical path branched by the spectroscope and that detects the position in a Z-axis direction of a workpiece according to an intensity of light corresponding to the wavelength of return light that is generated when the light of the wide band light source is condensed by the condenser and is reflected by the workpiece held by a chuck table.

Abstract: The present invention relates to a microscope for quantitative measurements of the wavefront, comprising: means for the illumination of a sample (T); an objective lens (2); an ordered two-dimensional arrangement of lenses (3), with a spacing p? greater than 500 ?m and a relative aperture of less than 10; an image sensor (4) located in a capture space (Ec) to receive the light scattered by the sample (T), and to acquire spatial and angular information on the object wavefront associated therewith; and a computational entity to perform a computational reconstruction of the object wavefront from the spatial and angular information. Other aspects of the invention relate to a method, a computer program and a product incorporating the same, adapted for the performance of the functions of the computational entity of the microscope, as well as to a module and a kit for a microscope.

Abstract: A platform for design of a lighting installation generally includes an automated search engine for retrieving and storing a plurality of lighting objects in a lighting object library and a lighting design environment providing a visual representation of a lighting space containing lighting space objects and lighting objects. The visual representation is based on properties of the lighting space objects and lighting objects obtained from the lighting object library. A plurality of aesthetic filters is configured to permit a designer in a design environment to adjust parameters of the plurality of lighting objects handled in the design environment to provide a desired collective lighting effect using the plurality of lighting objects.

Abstract: A multifunctional unit for analysis and calibration of devices and components of a vehicle and, in particular, of a motor vehicle, comprising a movable trolley of support; above the movable trolley there is a base, which carries a screen or panel, at the top of which a video projector is placed, suitable for projection of calibration panels used in driver assistance systems of vehicles.

Abstract: An aiming adjustment method for adjusting a posture of a vehicle lamp provided with a LIDAR device includes: providing a screen in front of the LIDAR device; detecting a state of a surface of the screen by the LIDAR device; detecting an angular error of the posture of the vehicle lamp based on a detection signal indicating the detected state of the surface; and correcting the posture of the vehicle lamp based on the angular error.

Abstract: Systems for inspecting a surface of an optical wave originating from an optical device are provided. The optical device includes an exit pupil, and the inspection system includes an optical measuring head and a computer for processing the images from said optical measuring head. The optical measuring head includes a density gradient filter, the density varying periodically in the two directions in space, a matrix frame having at least four identical lenses of square shape of the same focal length and being arranged symmetrically, and a photodetector array, each of the four lenses forming an image of the pupil in the plane of this array. The image processing computer includes computing means for computing the partial derivatives ? ? ? x ? ( x , y ) and ? ? ? y ? ( x , y ) of the wave surface ?(x, y) in the plane of the exit pupil.

Abstract: A beam steering method and device are provided. The beam steering method includes outputting, from a hologram recording medium on which a plurality of signal light beams having different steering information are recorded, signal light beam having specific steering information, by making reference light having a specific characteristic incident on the hologram recording medium. The method further includes obtaining information about an object existing in the external environment based on the output signal light.

Abstract: Methods for evaluating performance a diode laser are provided. In embodiments, methods include receiving a laser beam profile of a diode laser, determining first, second and third laser beam widths at first, second and third laser intensities, respectively, for the laser beam profile, computing a first ratio between the second and third laser beam widths, computing a second ratio between the first and second laser beam widths, evaluating laser performance based on the first and second ratios, and outputting a determination regarding the suitability of the laser for use in a flow cytometry setting. Devices for practicing the subject methods are also provided, and include first and second stages configured to receive a diode laser and beam profiler, respectively. Aspects of the invention further include flow cytometers incorporating a diode laser that has been evaluated by the subject method.

Abstract: A method for determining wavefront shapes of N angular channels CL of different propagation directions PL, said propagation directions PL being determined by a mean propagation direction vector , from a single signal image acquisition I(x,y) of a multi-angular signal light beam containing said angular channels, each angular channel Ci being separated from other angular channels Cj by an angular separation ??ij defined by ??ij=arccos, where “·” stands for the inner product between and .

Abstract: Method for simultaneously compensating pupil coordinate distortion and shear amount change in a process of wavefront reconstruction in grating transverse shear interference. Where a wavefront is diffracted by a grating, the shapes and light paths of the diffracted wavefronts of all the orders are different, so that on one hand, a coordinate system detected by a detector plane is distorted relative to a pupil coordinate system, and on the other hand, a shear amount changes along with a coordinate position.

Abstract: A system includes a target illumination laser (TIL) configured to generate a TIL beam that illuminates a target and a beacon illumination laser (BIL) configured to generate a BIL beam that creates a spot on the target. The system also includes an imaging sensor configured to capture both (i) first images of the target containing reflected TIL energy from the TIL beam without reflected BIL energy from the BIL beam and (ii) second images of the target containing reflected TIL energy from the TIL beam and reflected BIL energy from the BIL beam. The system further includes at least one controller configured to perform target tracking using the first images and boresight error compensation using the second images.

Abstract: Quantitative phase gradient microscopes (QPGM) using metasurface layers including birefringent lenses are disclosed. The birefringent lenses are manufactured by patterning nanoposts on two different transparent substrates or on opposite sides of the same transparent substrate. Methods to generate phase gradient images (PGI) of objects using the described devices are also disclosed.

Abstract: A method assesses the beam profile of a light beam of a non-contact tool setting apparatus, the apparatus including a transmitter for emitting the light beam and a receiver for receiving the light beam. The receiver generates a beam intensity signal describing the intensity of received light. The apparatus is mounted to a machine tool having a spindle that is moveable relative to the non-contact tool setting apparatus. The method includes loading an object having an edge into the spindle of the machine tool and using the machine tool to move the spindle relative to the apparatus so that the edge of the object passes through the light beam. The beam profile of the light beam is then determined using the beam intensity signal generated at a plurality of positions during the step (ii) of moving the edge of the object through the light beam.

Abstract: A lighting apparatus, for example for applications in the show-business or entertainment sector, including: a light-radiation generator, for example a laser generator, configured for projecting a lighting beam towards a lighting space in a certain direction; control circuitry of the light-radiation generator configured for controlling emission of the lighting beam by the light-radiation generator; and processing circuitry configured for calculating a thermal retinal radiance ratio of the light-radiation generator as a function of a distance from the light-radiation generator in the aforesaid direction and for acting on the control circuitry of the light-radiation generator in order to control the lighting beam of the light-radiation generator as a function of the thermal retinal radiance ratio, with the aim of maintaining the aforesaid thermal retinal radiance ratio below unity starting from a certain value of distance from the light-radiation generator in the aforesaid direction.

Abstract: Light-emitting module, notably motor vehicle lighting and/or signaling module, including at least two sub-modules each including at least two light sources activatable selectively to each produce a segment of a partial light beam. Also included is a projection optic common to the two sub-modules for projecting said light-emitting segments. The sub-modules and the projection optic being adapted to produce a homogeneous segmented beam.

Abstract: A method and system for calibrating a three dimensional printing system includes a specialized sensor. The three dimensional printing system forms a three dimensional article of manufacture through a layer-by-layer process. Layers are formed by the operation of a light engine selectively curing photocure resin onto a face of the three dimensional article of manufacture. The sensor includes a photodetector overlaid by an optical element. The optical element simulates a “dense portion” of an optical path between the light engine and the face of the three dimensional article of manufacture being formed. The “dense portion” of the optical path includes a layer of photocure resin that is disposed between the light engine and the face of the three dimensional article of manufacture.

Abstract: A system for aiming a headlamp of a vehicle includes a displaceable aiming surface and an imaging system. The imaging system includes a translatable aim box carrying at least one headlamp imager oriented to capture images of a single headlamp and/or one or more vehicle features adjacent to the single headlamp. At least one fixed imager is oriented to capture one or more images of the displaceable aiming surface. The translatable aim box may be configured to translate between the single headlamp and another headlamp. One or more computing devices are configured to perform methods for headlamp aim correction using the described system. Methods for headlamp aim correction are described.

Abstract: A wavefront sensor system suitable for integration into an integrated circuit light detector may provide for wave angle sensors having varying functional relationships between the wave angle and signal to provide improved dynamic range. These wave angle sensors may be combined with integrated circuit phase angle sensors for a more complete analysis of the waveform.

Abstract: To provide a luminous body measurement apparatus capable of being easily downsized, with which luminance of a luminous body can be measured in a wide range on a measurement sphere. The luminous body measurement apparatus is configured to pivot a first arm and a second arm in a non-inverted posture to obtain luminance data of a sample at a plurality of image pickup positions in a first region of the measurement sphere, and is configured to pivot the first arm and the second arm in an inverted posture to obtain luminance data of the sample at a plurality of image pickup positions in a second region adjacent to the first region, the non-inverted posture being a posture under which a supporting portion is located on one side of an axis as viewed from a holding portion, the inverted posture being a posture under which the supporting portion is located on another side of the axis as viewed from the holding portion.

Abstract: A vehicle headlight measurement system instrumentation structure, comprises: a support structure; a vehicle calibration assistance structure, which is carried by the support structure and includes a headlight aiming device; a positioning target element, having a surface provided with a predetermined graphical feature, the positioning target element being supported by the support structure and oriented in a forward direction towards the service area; a positioning device, configured for aiding a relative positioning between the vehicle and the vehicle calibration assistance structure; a processing system which is operatively connected to the positioning device.

Abstract: A laser system includes a controller comprising a processor and a non-transitory machine-readable memory, a laser head configured to output a laser beam, a work bed positioned opposite the laser head, and a power meter communicatively coupled to the electronic control unit and integrated within the work bed. The laser system further includes a knife edge plate positioned between the power meter and the laser head, and a machine-readable instruction set stored in the non-transitory machine readable memory that causes the laser system to perform at least the following when executed by the processor: position the laser head at a distance from the power meter, cause the laser head to output the laser beam, translate the laser head across the power meter, receive power signals from the power meter as the laser beam is translated across the power meter, and calculate a spot size based on the power signals.

Abstract: A method of calibrating an additive manufacturing machine includes obtaining a model for the additive manufacturing machine, obtaining a baseline sensor data set for a particular additive manufacturing machine, creating a machine-specific nominal fingerprint for the particular additive manufacturing machine with controllable variation for one or more process inputs, producing on the particular additive manufacturing machine a test-page based object, obtaining a current sensor data set of the test-page based object on the particular additive manufacturing machine, estimating a scaling factor or a bias for each of the one or more process inputs from the current data set, and updating a calibration file for the particular additive machine if the estimated scaling error or bias are greater than a respective predetermined tolerance. A system for implementing the method and a non-transitory computer-readable medium are also disclosed.

Abstract: An apparatus and a method for in-situ phase determination are provided. The apparatus includes a measurement chamber configured to retain a substance, and an entrance window mounted on a side of the measurement chamber. An exit window is mounted on an opposite side of the measurement chamber, and the exit window is parallel with the entrance window. The apparatus further includes a light source configured to generate an incident light beam. The incident light beam is directed to the entrance window at a non-zero angle of incidence with respect to a normal of the entrance window. The incident light beam passes through the entrance window, the measurement chamber and the exit window to form an output light beam. A detector is positioned under the exit window and configured to collect the output light beam passing through the exit window and generate measurement data.

Abstract: A light emitting device includes a light emitting diode (LED); a transparent optic having a refractive index noptic; and a phosphor layer spaced apart from the LED and positioned between the LED and the transparent optic. The phosphor layer has an effective refractive index nphosphor, where a gap between the LED and the phosphor layer has a refractive index ngap that is less than nphosphor. The transparent optic has an inner convex surface in contact with the phosphor layer. The inner convex surface has an inner radius of curvature r; and an outer convex surface facing away from the phosphor layer and being a surface through which the light emitting device emits light into a medium adjacent the outer convex surface. The medium has a refractive index nmedium. The outer convex surface has an outer radius of curvature R, such that r/R is equal to nmedium/noptic.

Abstract: A system and process for testing and analyzing a laser beam is provided. The system and process allows for repeatable testing of a laser beam to provide a beam intensity profile while accounting for variation in measurements attributable to outside factors. The system and process further allows for simultaneous measurement and analysis of a laser beam having multiple wavelengths.

Abstract: The invention describes a method of analyzing a light distribution of a vehicle headlight. The method determines a cutoff line based on a brightness distribution within a column of an image of the light distribution, the column being perpendicular to a horizon in the image. The method compares the cutoff line with a reference cutoff line and uses the deviations revealed by such comparison to attribute a reduced quality of the light distribution to a particular one of several possible causes. The invention further describes a vehicle headlight analyzer which is arranged to perform the method. The invention finally describes a corresponding computer program product comprising code for executing the method on a processing device.

Abstract: In one example, a method of controlling generation apparatus for generating a three-dimensional object is described. For example, data indicative of at least one physical property affecting heat transfer from an object may be determined and used to determine a cooling time, and a component of the generation apparatus may be controlled in response to the determined cooling time.

Abstract: A lithography system is provided and includes a light source device configured to emit a processing light beam onto the semiconductor wafer, to generate a penetrating light beam and a reflected light beam. The lithography system further includes a detecting module having a first detector and a second detector. The first detector is configured to receive the penetrating light beam to generate first power data, and the second detector is configured to receive the reflected light beam to generate second power data. The lithography system also includes a monitoring device configured to calculate absorbed power data of the semiconductor wafer according to the first power data, the second power data and reference power data of a reference light beam and configured to compensate for a pattern formed on the semiconductor wafer resulting from the processing light beam according to the absorbed power data and reference information.

Abstract: A lens characteristic evaluation device includes: a scanning optical system configured to scan a surface of a test lens with a linear luminous flux; a Hartmann plate provided on a side opposite to the scanning optical system with respect to the test lens and having a plurality of two-dimensionally arranged pinholes, the Hartmann plate being configured to transmit the linear luminous flux which has passed through the test lens and radiated on the pinholes by the scanning performed by the scanning optical system; a screen on which the linear luminous flux having passed through the Hartmann plate is projected; and a photographing optical system provided on a side opposite to the Hartmann plate with respect to the screen and configured to photograph the screen while the scanning with the linear luminous flux is being performed by the scanning optical system.

Abstract: There is provided an improved light source including a plurality of light emitting elements in a surface. An arrangement of the plurality of light emitting elements fulfills, in an assumed projection area, an element interval at which irradiation light beams of the plurality of light emitting elements overlaps, and fulfills an element interval at which a speckle pattern of each of the irradiation light beams obtained in the assumed projection area is different for each of the irradiation light beams.

Abstract: A method and apparatus are disclosed. The method may include determining a current zoom value of a camera and determining a first modulation transfer function of a transparent dome of the camera. The method may include applying a first low-pass filter to an image captured by the camera based on the current zoom value and the first modulation transfer function of the transparent dome.

Abstract: A spectroscopic measuring device includes a halogen lamp as a light source, a lens of an irradiating system, a mirror, and a spectrometer. The lens of the irradiating optical system emits light from the halogen lamp to a measurement object. The mirror is an optical member, and the mirror is arranged coaxial with the lens and conducts detecting light between the halogen lamp and the measurement object, to the spectrometer. The spectrometer is an analyzing part and analyzes material of the measurement object on the basis of the light received via the mirror. The light from the halogen lamp to the measurement object passes through the peripheral part of the optical axis of the lens, and the light to be received by the spectrometer passes through the center part of the optical axis of the lens, at the position of the mirror.

Abstract: The disclosed computer-implemented method for managing security programs may include (i) identifying a security program configured to analyze files on a client device to detect malicious files, (ii) determining a result the security program would report for an analysis of a file on the client device, (iii) intercepting an attempt by the security program to analyze the file, and (iv) determining, based on the result the security program would report for the analysis of the file, whether to permit the security program to analyze the file. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: A beam quality measurement system for determining beam quality of a high power laser beam from a laser system by power-in-the-bucket (PIB) measurements in a laboratory environment. The system includes a beam compressor assembly for compressing the diameter of the laser beam, and a diagnostic bench assembly that receives the reduced diameter low power beam from the beam compressor assembly. The bench assembly includes a pinhole array positioned at a focal plane of a lens and that includes a plurality of different sized pinholes and a translation stage for moving the pinhole array. The bench assembly also includes a power meter that receives the focused beam after it has passed through a pinhole in the pinhole array, where the power meter generates a signal that causes the stage to move the pinhole array to position another pinhole when the power meter identifies a maximum power received from one pinhole.

Abstract: Disclosed is a data acquisition device for optical compensation including a platform for carrying a display panel; and a linear image acquisition module located above the platform. The linear image acquisition module is movable relative to the platform.

Abstract: A beam dump apparatus may include: an attenuator module; a beam dump module; and a control unit. The attenuator module includes: a first beam splitter provided inclined with respect to the optical axis of a laser beam at a first angle; a second beam splitter provided inclined with respect to the optical axis at a second angle; a first beam dumper provided such that the laser beam from the first beam splitter enters thereinto; a second beam dumper provided such that the laser beam from the second beam splitter enters thereinto; and a first stage that causes the beam splitters to advance into and retreat from the optical path. The beam dump module includes: a mirror; a third beam dumper provided such that the laser beam from the mirror enters thereinto; and a second stage that causes the mirror to advance into and retreat from the optical path.

Abstract: An ultra-high resolution cinema camera system collects light from a captured image with a 120 mm image format lens, and then optimizes the light in an image sensor having a plurality of 13.8 micron photosites that convert the captured light to binary signals. The camera system also provides a Field Programmable Gate Array that converts the binary signals through Analog-to-Digital Conversion technology, so as to process the binary signal into a full resolution RAW or ProRes video files. The RAW or ProRes video file is processed and stored in embedded stacked memory units, and then distributed through a signal distribution portion to create a modern cinema effect of a captured image. The camera system is unique in that it is digital and does not utilize 35 mm or 65/70 mm film formats, as known in the art. The 120 mm×67.5 mm format utilized by the camera system allows for the industry standard aspect ratios.

Abstract: A system for determining the position of a portable device (501) relative to a luminaire (100, 503) is disclosed. The system comprises at least one luminaire (100, 503) that comprises at least two light emitters (101A, 101B) for emitting light that comprises a light signature identifying the light emitter from which the light is originated. The system further comprises an optical system (102) that creates a position specific distribution (103) of the light emitted by the two light emitters (101A, 101B). This light can be sensed by a portable device (501) comprising a sensor for sensing light, a memory for storing distribution information indicative of the distribution of the light emitted via the optical system (102) and a processor coupled to the light sensor for receiving data on the sensed light and coupled to the memory to get access to the information stored in the memory.

Abstract: A spectroscopic measuring device includes a halogen lamp as a light source, a lens of an irradiating system, a mirror, and a spectrometer. The lens of the irradiating optical system emits light from the halogen lamp to a measurement object. The mirror is an optical member, and the mirror is arranged coaxial with the lens and conducts detecting light between the halogen lamp and the measurement object, to the spectrometer. The spectrometer is an analyzing part and analyzes material of the measurement object on the basis of the light received via the mirror. The light from the halogen lamp to the measurement object passes through the peripheral part of the optical axis of the lens, and the light to be received by the spectrometer passes through the center part of the optical axis of the lens, at the position of the mirror.

Abstract: A piercing processing method and a laser processing machine capable of carrying out a piercing processing on a thick plate in short time are provided. It is a processing method for carrying out a piercing processing on a metallic material by laser beams with wavelengths in 1 ?m band, where the piercing processing is carried out by maintaining a range of 8?Zr/d?12 when a condensed beam diameter of the laser beams is set to be d and a Rayleigh length of the laser beams is set to be Zr. At that time, a focal position of the laser beams is set to be on a surface of a workpiece or an external of the workpiece. Then, a beam profile of the laser beams is such that the laser beams of a single mode are converted into a bowler hat shape by a beam quality tunable device.

Abstract: A method corrects a captured image and includes the steps of determining an effect of atmosphere and a distance from an image capture device which is spaced relatively far from an area of interest. The method utilizes a transmission and reception device to identify the effect on a transmitted and reflected signal due to the atmosphere and distance. An image of the area of interest is captured. The image is corrected based upon the effect of the distance and atmosphere on the transmitted and reflected signal. An apparatus programmed to perform the method is also disclosed. An apparatus for capturing an image from a distance is also disclosed.

Abstract: A system for mission parameterization is provided and includes a vehicle that itself includes a sensor to sense characteristic sensed elements in surroundings of the vehicle and a computing device. The computing device includes a processing unit and a memory unit. The memory unit has a database configured to associate objects disposable in the surroundings with sensible characteristic object elements and executable instructions. The executable instructions are configured to cause the processing unit to find correspondence between any characteristic sensed elements in the surroundings, which are sensed by the activated sensor, and any of the characteristic object elements, identify objects in the surroundings based on the correspondence and set mission parameters based on identifications of the objects in the surroundings.

Abstract: There is provided a lighting fixture including: a light source that emits a light beam; an electrodeposition device that includes multiple pixels of which a transparent state and a mirror state are switchable, independently, and that is disposed such that a normal direction of a pixel surface is not parallel to an optical axis direction of an incident light beam on an optical path of a light beam emitted from the light source; and an optical system that emits, as an illumination beam, both a light beam transmitted through the electrodeposition device and a light beam reflected from the pixel in the mirror state in the electrodeposition device.

Abstract: A device may include a substrate. The device may include a carrier mounted to the substrate. The device may include a transmitter photonic integrated circuit (PIC) mounted on the carrier. The transmitter PIC may include a plurality of lasers that generate an optical signal when a voltage or current is applied to one of the plurality of lasers. The device may include a first microelectromechanical structure (MEMS) mounted to the substrate. The first MEMS may include a first set of lenses. The device may include a planar lightwave circuit (PLC) mounted to the substrate. The PLC may be optically coupled to the plurality of lasers by the first set of lenses of the first MEMS. The device may include a second MEMS, mounted to the substrate, that may include a second set of lenses, which may be configured to optically couple the PLC to an optical fiber.

Abstract: An object information acquiring apparatus is used, which includes: an irradiation unit for irradiating an object with a laser beam; a restriction unit for restricting an output of the laser beam from the irradiation unit; a control unit for controlling an irradiation of the laser beam and an activation of the restriction unit; a probe for receiving acoustic waves that are generated from the object irradiated with the laser beam; and a construction unit for generating characteristic information relating to the object in use of the acoustic waves, wherein the control unit performs irradiation control of not irradiating the laser beam when the restriction unit is being activated.

Abstract: A method and a system for determining a displacement of an object are provided. The method includes: providing a predetermined modal power distribution characteristic; directing a light onto the object resulting in a reflected light; propagating the reflected light through different propagation modes, receiving a resulting modal power distribution characteristic; and comparing the resulting modal power distribution characteristic with the predetermined modal power distribution characteristic to determine the displacement of the object.

Abstract: A coordinate measuring device includes a carrier that can be rotated automatically about two axes and that can be directed toward a measuring aid. The following are arranged on the carrier so as to be able to move together: an optical distance measuring device for measuring the distance to the measuring aid; a light source for emitting light, directly or by means of optical elements, wherein said light is visible as a target point when reflected on the measuring aid; a target detecting unit for determining a position as the position of the imaging of the target point on a position detection sensor. The control apparatus is designed to direct the carrier at the measuring aid by rotating the carrier about the at least two axes of the carrier according to the fine position and the rough position; and the light source is a superluminescent diode (SLED).