Tilt and radial error motion of a laser tracker head as it spins about the two axes results in small but measurable ranging and angle errors. The laser tracer, on the other hand, measures range with respect to the center of a high quality stationary sphere. It is therefore not expected to be influenced by the error motions of the carriage that carries the optics and the source, but the form error of the reference sphere, although extremely small, will be a contributor to the ranging errors. In this paper, we describe experiments to assess the magnitude of these ranging errors as a function of the horizontal angle in different laser trackers and a laser tracer.
Citation: Measurement Science & Technology
Pub Type: Journals
laser tracer, laser tracker, radial error, ranging error, wobble