Method of calibrating laser measurement systems in-situ

摘要

A process for calibrating and correcting errors in laser measurement systems in situ, either remotely over the Internet or where the laser measurement system is physically located. In one embodiment, a number of targets are arrayed around the scanner and read by the software of a system. The laser scanner is rotated 180 degrees and the positions of the targets are read again. A correction factor is determined by calculation and displayed to show the expected improvement in accuracy of the laser measurement system. In a second embodiment, the laser scanner is positioned under a vehicle with targets at reference positions for which the measurements are known. The scanner readings are checked against the known values and a correction factor developed. This could be applied on a one-time basis or it can be programmed in the host computer where evaluation and compensation occur automatically.

主权项

1. A method of calibrating a laser measurement system in-situ, wherein the laser measurement system includes a laser scanner having synch pulses and a base line within said laser scanner, comprising the steps of:
a) placing a scanner in a location having at least two random targets; b) using the scanner to scan the at least two random targets to create a first set of data; c) storing said first set of data; d) repositioning the scanner; e) using the scanner to scan each of said at least two random targets to create a second set of data; f) comparing said first and second sets of data to determine a true position of each of said at least two random targets and to create a correction factor for said scanner such that the synch pulses are coordinated and the base line of the scanner is a true base; wherein the step of comparing said first and second sets of data, further includes the steps of: g) interpolating said first and second sets of data; and h) correcting a synch pulse generated by said scanner using the correction factor such that the synch pulses are coordinated and the base line of the scanner is a true base.