Robot-assisted high-dynamic-range optical measurement

This paper presents a robot-assisted optical metrology system for measuring three-dimensional (3D) objects. The metrology system performs high-dynamic-range stitching measurements and incorporates self-calibration capabilities to correct systematic errors in the optical sensor. It uses an optical sensor (based on fringe projection) to measure the target surface (partially, limited to the field of view and measurable areas) of a 3D object. The sensor is mounted on a robotic arm to significantly expand the measurement range while maintaining the highest possible resolution, thus enabling high dynamic range measurements (large measurement range and high resolution at the same time, which are often contradictory). Systematic measurement errors, such as distortions inherent to the fringe projection sensor, are calibrated through a self-calibration process. The performance of the developed metrology system is validated through measurement experiments on various objects.