Meaning
Precision coordinate measurements use a focused laser beam to track a retroreflective target held against the surface being evaluated. This technique, known as laser tracker metrology, provides sub-millimeter positioning data over large distances, making it ideal for checking the alignment of antenna arrays and large enclosures. It is used when traditional hand tools or coordinate measuring machines cannot reach or cover the required volume.
Spatial Verification
Operating with a hand-held spherically mounted retroreflector, the instrument tracks the position of the target as it moves along the surface. Continuous tracking allows the system to calculate the three-dimensional coordinates of the target in real time. This is especially useful during the assembly of large chassis structures where mechanical distortion must be kept below fifty microns.
Integration Workflow
Engineers use this spatial data to verify that the mounting points on a frame match the digital CAD model before delicate electronics are installed. If the mounting pads are out of alignment, the resulting stress when the boards are bolted down could crack solder joints or damage fragile ceramic capacitors. Using laser tracker metrology ensures that the chassis is straight and ready for component integration without risk of damage.
Calibration Standard
The system must be calibrated regularly against a known reference distance to maintain its accuracy. Environmental factors like temperature and humidity can alter the refractive index of the air, affecting the laser beam. Modern software adjusts for these changes automatically.
