Abstract: The invention relates to a system and a method for simultaneous range and velocity measurement in an FMCW LiDAR system. A first light source (16) produces first light having a first frequency that varies according to a first chirp rate. A second light source (18) produces second light having a second frequency that is constant or that varies according to a second chirp rate being different from the first chirp rate. Measuring light obtained by combining the first and second light therefore has two different frequency components during a measurement interval. A splitter (22) separates the measuring light into reference light and output light, and a scanning unit (28) directs the output light towards an object (12) and receives input light that is obtained by reflection of the output light at the object (12). A detector (32) detects a superposition of the reference light and the input light.

Abstract: A support rail of an ear lifter for crops, having a major direction of extension, wherein a portion formed as a skid is disposed between a first end and a second end of the support rail, the portion formed as a skid being adapted to be guided with an outer side over a ground; and an ear lifter for a mower of a harvesting machine, comprising a stalk lifter and a support rail supporting the stalk lifter.

Abstract: Ear lifter for crops having a support bar, wherein the support bar extends in a major direction of extension and has a fastening portion, a middle portion and a skid portion arranged one after the other in the major direction of extension.

Abstract: A device for measuring objects is provided, said device comprising a mobile base such that it is movable to objects to be measured. Then, the object may be measured by means of a measuring head fastened to a kinematic unit.

Abstract: A method for operating a LIDAR system with at least one spectrally tunable light source emitting a light beam having a temporally varying frequency and a transparent protective shield, arranged in a light path of the light beam, protecting the LIDAR system against environmental pollution includes determining distance values of an object based on beat frequencies of beat signals resulting from a superposition of partial signals obtained from partial reflection of the light beam at the object with reference signals not reflected at the object. Each distance value is determined from a peak in a signal spectrum obtained on the basis of a Fourier transformation of the beat signal. A degree of soiling of the protective shield is diagnosed by analyzing the signal spectrum in a predefined analysis frequency range. An upper limit frequency bounding said analysis frequency range is based on a distance of the protective shield.

Abstract: A device for two-dimensionally scanning beam deflection of a light beam has spectrally tunable light source that emits a light beam having a time-varying wavelength. The device further comprises a first optical component that produces a first beam deflection. The first beam deflection causes the light beam to be deflected wavelength-dependently in a first direction. A second optical component produces a second beam deflection which causes the light beam to be deflected in a second direction different to the first direction. The second optical component comprises a prism pair comprising two prisms that are rotatably arranged successively in a beam path of the light beam. The two prisms are configured to perform continuous counter-rotational movements.

Abstract: An apparatus for ascertaining a distance to an object has a light source that emits an optical signal having a time-varying frequency. An evaluation device ascertains a distance to the object based on a measurement signal that originated from the optical signal and was reflected at the object and, and on a reference signal that was not reflected at the object. A dispersive element produces a frequency-selective angle distribution of the measurement signal that has a plurality of partial signals which are steered to the object at mutually different angles.

Abstract: A device for measuring objects is provided, said device comprising a mobile base such that it is movable to objects to be measured. Then, the object may be measured by means of a measuring head fastened to a kinematic unit.

Abstract: A method for calibrating an optical arrangement for determining dimensional properties of a measurement object and a coordinate measuring machine implementing the method are disclosed. The optical arrangement has a camera and a projector for projecting a first periodic pattern onto a projection area. The optical arrangement is moveable relative to a workpiece table along a first axis. A matte surface is arranged on the workpiece table at a first position relative to the optical arrangement. A second periodic pattern, which is separate from the first periodic pattern, is provided and shifted on the matte surface. Images of the second pattern are recorded using the camera and at least one distortion aberration of the camera is determined using the second periodic pattern.

Abstract: An optical sensor for determining a coordinate of a measurement object is provided which includes a stop element and an illumination apparatus configured to generate an illumination light beam and to illuminate the measurement object through the stop element, a sensor element configured to detect a portion of a detection light beam emanating from the measurement object and to determine an intensity distribution, and an optical element configured to focus a portion of the illumination light beam at one focal point along an optical axis. The optical sensor includes an apparatus configured to vary and set a relative lateral position of the optical axis to the measurement object to determine, for each of first and second focal points, first and second intensity distributions at first and second relative lateral positions and to determine therefrom a distance coordinate and/or a lateral coordinate of the measurement object.

Abstract: The invention relates to a support bar (5) of a crop lifter (10) for harvested crops, having a main direction of extension (X). A portion (12) designed as a sliding skid is arranged between a first end (8) and a second end (9) of the support bar (5). The invention also relates to a crop lifter (10) for a cutter bar of a harvesting machine, comprising a stalk lifter and a support bar (5) carrying said stalk lifter.

Abstract: An optical sensor for determining a coordinate of a measurement object is provided which includes a stop element and an illumination apparatus configured to generate an illumination light beam and to illuminate the measurement object through the stop element, a sensor element configured to detect a portion of a detection light beam emanating from the measurement object and to determine an intensity distribution, and an optical element configured to focus a portion of the illumination light beam at one focal point along an optical axis. The optical sensor includes an apparatus configured to vary and set a relative lateral position of the optical axis to the measurement object to determine, for each of first and second focal points, first and second intensity distributions at first and second relative lateral positions and to determine therefrom a distance coordinate and/or a lateral coordinate of the measurement object.

Abstract: The invention is directed to a method for measuring an internal thread of a workpiece with a coordinate measuring apparatus and a CCD or CMOS sensor. The sensor records at least two images of a section of the internal thread and the recording conditions for the two images are modified. The data from these two recorded images are used to establish the position, orientation, core diameter and/or the pitch of the internal thread. The invention is also directed to an arrangement for measuring an internal thread of a workpiece and includes a coordinate measuring apparatus and the CCD or CMOS sensor in accordance with the above method.

Abstract: A method for calibrating an optical arrangement for determining dimensional properties of a measurement object and a coordinate measuring machine implementing the method are disclosed. The optical arrangement has a camera and a projector for projecting a first periodic pattern onto a projection area. The optical arrangement is moveable relative to a workpiece table along a first axis. A matte surface is arranged on the workpiece table at a first position relative to the optical arrangement. A second periodic pattern, which is separate from the first periodic pattern, is provided and shifted on the matte surface. Images of the second pattern are recorded using the camera and at least one distortion aberration of the camera is determined using the second periodic pattern.

Abstract: The invention is directed to a method for measuring an internal thread of a workpiece with a coordinate measuring apparatus and a CCD or CMOS sensor. The sensor records at least two images of a section of the internal thread and the recording conditions for the two images are modified. The data from these two recorded images are used to establish the position, orientation, core diameter and/or the pitch of the internal thread. The invention is also directed to an arrangement for measuring an internal thread of a workpiece and includes a coordinate measuring apparatus and the CCD or CMOS sensor in accordance with the above method.

Abstract: A measuring unit is set up to determine a relative position and relative orientation between the measuring unit and an arrangement of at least three optical elements. The measuring unit comprises a length measuring device, which emits measuring beams at at least three locations spaced apart from one another, and at least one beam directing device set up to direct the measuring beams to optical elements of the arrangement. The beam directing device is controllable in order to guide at least one of the measuring beams to a plurality of optical elements of the arrangement in a time-sequential manner in order to carry out a plurality of length measuring operations in a time-sequential manner in such a manner that, in the plurality of length measuring operations, each measuring beam of the at least one measuring beam strikes precisely one of the optical elements. A total of six lengths are measured in this manner.

Abstract: A device for determining a position of an object (25) in a spatial region (28) comprises a light source (3), a light directing device (4-9), at least one reference signal detector (11, 12) and a detector arrangement (13, 14). The light source (3) generates a sequence of light pulses with a repetition rate. The light directing device (4-9) directs the sequence of light pulses into the spatial region (28) and, as a reference signal (20), to the at least one reference signal detector (11, 12). The detector arrangement (13, 14) detects a plurality of light signals (23, 24) which are reflected and/or scattered by the object (25) in the spatial region (28) into a plurality of different directions by reflection and/or scattering of the sequence of light pulses.

Abstract: A device for measuring a surface (2) comprises a light source (3), a light directing device (4-6), a detector arrangement (10) and an evaluation circuit (15). The light source (3) generates a sequence of light pulses with a repetition rate. The light directing device (4-6) is controllable to direct the sequence of light pulses onto a surface area (25) of the surface (2). The surface area may be selected from plural surface areas (25, 27). The detector arrangement is configured to receive at least one light signal (21-24) scattered and/or reflected by the surface area (25). The evaluation circuit (15) is coupled to the detector arrangement (10) and is configured to determine a phase difference between a reference signal (19) derived from the sequence of light pulses and a signal component of the at least one light signal (21-24), in order to determine a position of the surface area (25).

Abstract: An evaluation device for path length measurement configured to evaluate a measured signal representing an intensity of a sequence of pulses of electromagnetic radiation, particularly a sequence of light pulses, as a function of time, after the sequence has traveled through a path length to be measured. The sequence of light pulses is generated with a repetition rate by a radiation source, particularly a light source. The evaluation device is configured to evaluate a first component of the measured signal, which oscillates with a first frequency, and a second component of the measured signal, which the second component oscillates with a second frequency that is greater than the first frequency. The first frequency may correspond to the repetition rate or a multiple of the repetition rate. The second frequency may correspond to another multiple of the repetition rate.

Abstract: An evaluation device, measuring arrangement and method for path length measurement. The evaluation device for path length measurement is configured to evaluate a measured signal which represents an intensity of a sequence of pulses of electromagnetic radiation as a function of time. The sequence of pulses has a repetition rate. The evaluation device is configured to determine a phase difference between a component of the measured signal, the component oscillating with a frequency, and a reference signal which oscillates with the frequency. For this purpose, the evaluation device generates, for example by frequency mixing, a first signal and a second signal which have another phase difference, such that the first signal and the second signal each oscillates with another frequency which is different from said frequency, and that the other phase difference has a predetermined relation to the phase difference.