Abstract:
A system and method for determining the angular position of a bearing assembly and compensating measurements for bearing runout error in metrology devices, such as an articulated arm coordinate measurement device and a laser tracker, is provided. The system and method includes measuring the bearing runout error and defining a waveform from encoder readings for a first set of rotations. In one embodiment, a transfer function is created based on an analysis of the bearing runout error, such as with a Fourier analysis for example. In another embodiment the bearing runout error is mapped to an absolute angular position. During operation, the angular position of the bearing assembly is determined by comparing a waveform to the waveform from the first set of rotations. With the angular position determined, the bearing runout error may be used to compensate the measurements of the metrology device.
Abstract:
A method and apparatus for correcting errors in a bearing cartridge used in a portable articulated arm coordinate measurement machine (AACMM) is provided. The method includes providing a cartridge having a first bearing and a second bearing arranged in a fixed relationship to define an axis, the cartridge further including an angle measurement device configured to measure a rotation of a portion of the cartridge about the axis. A plurality of angles is measured with the angle measurement device. A first plurality of displacements is determined at a first position along the axis, each of the first plurality of displacements being associated with one of the plurality of angles. Compensation values are determined based at least in part on the plurality of angles and the first plurality of displacements.
Abstract:
A system is provided for communicating between a 3D metrology device and a portable computing device via near field communications. In one embodiment, the metrology device is an articulated coordinate measurement machine (AACMM), a laser tracker, a laser scanner or a triangulation scanner, and the portable communications device is a cellular phone or a tablet. The portable device may use the NFC to establish to change or establish settings and parameters or to replace at least a portion of the operating system used to control the metrology device.
Abstract:
A coordinate measurement device sends a first beam of light having first and second wavelengths to a target point. The device includes a fiber-optic coupler that combines the first and second wavelengths and launches them through an achromatic optical element to produce collimated and aligned light. The device also includes first and second motors, first and second angle measuring devices, a distance meter, and a processor that determines 3D coordinates of the target point based on the measured distance and two angles.
Abstract:
A spherically mounted retroreflector (SMR) includes a substrate, an optic, and an adhesive. The substrate has a partially spherical outer surface and a cavity, the partially spherical outer surface has a sphere center. The optic has a cube-corner retroreflector fixedly disposed within the cavity; the cube-corner retroreflector has an optical vertex. The adhesive is disposed between the optic and the substrate and fixedly adheres the optic to the substrate. The optical vertex is coincident with the sphere center. The substrate is made from a ferromagnetic material and has an electroless nickel outer coating.
Abstract:
A laser scanner measures 3D coordinates from a first position and a second position and uses a sensor unit that includes at least an accelerometer and gyroscope to register the 3D coordinates, the registration based at least in part on comparison to a measured sensor displacement to a preferred displacement value.
Abstract:
A laser scanner has a light emitter, a rotary mirror, a light receiver, a first beam splitter to send electromagnetic energy from an electromagnetic energy generator into the environment, a second beam splitter to send reflected electromagnetic energy to a spectroscopic energy detector, and a control and evaluation unit, the spectroscopic energy detector configured to determine wavelengths in the reflected electromagnetic energy.
Abstract:
A portable articulated arm coordinate measurement machine having an articulated arm that includes a first arm connected to a second arm segment by a connecting segment. An assembly is provided having a first pair of bearings and a first optical encoder and a second pair of bearings and a second optical encoder The first optical encoder includes a first patterned disk and a first read head. The second optical encoder includes a second patterned disk and a second read head. The first and second patterned disks are both fixed with respect to the connecting segment. An electronic circuit is operably coupled to the first read head and the second read head, the electronics being configured to determine three-dimensional coordinates of the probe based at least in part on a first angle and a second angle measured by the first and second optical encoders.
Abstract:
A method for measuring and registering 3D coordinates has a 3D scanner measure a first collection of 3D coordinates of points from a first registration position. The 3D scanner collects 2D scan sets as 3D measuring device moves from first to second registration positions. A processor determines first and second translation values and a first rotation value based on collected 2D scan sets. 3D scanner measures a second collection of 3D coordinates of points from second registration position. Processor adjusts the second collection of points relative to first collection of points based at least in part on first and second translation values and first rotation value. Processor identifies a correspondence among registration targets in first and second collection of 3D coordinates, and uses this correspondence to further adjust the relative position and orientation of first and second collection of 3D coordinates.