METHOD FOR CORRECTING THREE-DIMENSIONAL MEASUREMENTS OF A SPHERICALLY MOUNTED RETROREFLECTOR

• US 20140098381A1
• Filed: 12/11/2013
• Published: 04/10/2014
• Est. Priority Date: 12/11/2013
• Status: Active Grant

• Current Assignee: Faro Technologies Incorporated
• Original Assignee: Faro Technologies Incorporated
• Inventors: Bridges, Robert E.
• Granted Patent: US 8,947,678 B2
• Time in Patent Office: Days
• US Class Current: 356/614
• CPC Class Codes: G01B 11/00 Measuring arrangements characterised by the use of optical techniques
• CPC Class Codes: G01B 11/002 for measuring two or more coordinates
• CPC Class Codes: G01B 11/005 coordinate measuring machines
• CPC Class Codes: G01B 11/02 for measuring length, width or thickness G01B11/08 takes precedence
• CPC Class Codes: G01C 15/002 Active optical surveying means optical plumbing G01C15/105
• CPC Class Codes: G01S 17/66 Tracking systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 7/497 Means for monitoring or calibrating

Abstract

A method of measuring spherically mounted retroreflector (SMR) with a 3D coordinate measurement device such as a laser tracker. The SMR includes an open-air cube corner retroreflector having a vertex point located near a sphere center of the SMR. Measurements of the SMR to the vertex point are moved to the SMR sphere center by accounting for SMR depth error and SMR runout error.

Claims

15-1. The method of claim 1 wherein, in the step of providing a first SMR, the first SMR further includes an information storage element.