Robot and sensor error determination system
First Claim
1. A method for determining robot positioning errors and sensor location errors, comprising the steps of:
- placing a reference object within a work volume of a robot carrying a sensor capable of making three dimensional measurements, said reference object having a symmetrical shape about an axis, said shape unambiguously defining location and orientation of said object for its small deviations relative to the robot position;
measuring said reference object from a single predetermined robot position at fixed sensor orientations rotationally incremented about a robot axis that is substantially aligned to said axis of symmetry;
recording said measurements in a memory, said measurements forming a baseline measurement set;
repeating said measurement step at a later time and producing another measurement set; and
processing said baseline set and said another measurement set to determine separately robot positioning errors and sensor location errors.
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Accused Products
Abstract
A method for measuring the position and orientation changes of a 3-D sensor relative to a robot mount and for measuring the positioning and orienting changes of the robot mount. All measurements reveal changes relative to a baseline measurement. A novel reference provides a low-cost measurement aid. A reference object is placed within the work volume of the robot carrying the sensor which is capable of making three-dimensional measurements. The reference object has a shape that enables unambiguous determination of its location and orientation. The reference object is measured from predetermined orientations, and the measurements are recorded in a memory. These measurements form a baseline measurement set. The measurement step is repeated at a later time, and another measurement set is produced. The baseline measurement set and the other measurement set are processed to determine robot positioning errors and sensor location errors.
76 Citations
10 Claims
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1. A method for determining robot positioning errors and sensor location errors, comprising the steps of:
- placing a reference object within a work volume of a robot carrying a sensor capable of making three dimensional measurements, said reference object having a symmetrical shape about an axis, said shape unambiguously defining location and orientation of said object for its small deviations relative to the robot position;
measuring said reference object from a single predetermined robot position at fixed sensor orientations rotationally incremented about a robot axis that is substantially aligned to said axis of symmetry;
recording said measurements in a memory, said measurements forming a baseline measurement set;
repeating said measurement step at a later time and producing another measurement set; and
processing said baseline set and said another measurement set to determine separately robot positioning errors and sensor location errors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- placing a reference object within a work volume of a robot carrying a sensor capable of making three dimensional measurements, said reference object having a symmetrical shape about an axis, said shape unambiguously defining location and orientation of said object for its small deviations relative to the robot position;
Specification