Coordinate Measurement Error Correction via Sensor Feedback
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Solution Overview
Problem
Coordinate measurement systems face errors due to relative movements between parts, probe deflection, and thermal or mechanical changes, leading to inaccuracies in work piece coordinate measurement.
Innovation Solution
An arrangement with a first and second part, each equipped with sensors and measuring bodies, allows for continuous monitoring of relative positions and movements, enabling correction of deviations through mathematical models and calibration, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If parts of the measurement arrangement are made mobile relative to one another to enable further measurements, then measurement versatility is improved, but measurement precision deteriorates due to relative movements causing errors
Solution Approach 1:
The patent applies feedback by continuously monitoring the relative position and orientation of mobile parts using sensors (such as encoders, laser interferometers, or capacitive sensors) and using this information to correct measurement values. The control system receives feedback signals about actual positions and adjusts the measurement data accordingly, compensating for deviations caused by mobility.
Solution Approach 2:
The patent replaces mechanical position monitoring with sensor-based detection systems. Instead of relying purely on mechanical references, the system uses optical, electromagnetic, or capacitive sensors to detect positions and orientations, enabling more precise and flexible measurement without mechanical constraints.
2Adaptability or versatility
If a probe is made mobile and deflectable from neutral position to mechanically sense the work piece, then measurement capability is improved, but measurement precision deteriorates due to probe deflection errors
Solution Approach 1:
The patent uses feedback by equipping the mobile probe with sensors (such as capacitive sensors, inductive sensors, or optical encoders) that continuously monitor the probe's position and deflection. The measured deflection values are fed back to the control system, which compensates for the probe's elastic deformation by calculating correction values based on the known mechanical properties of the probe.
Solution Approach 2:
The patent creates a virtual model or digital twin of the probe's mechanical behavior, including its deflection characteristics under various loads. This model is used to predict and compensate for probe deflection errors by comparing the actual probe position with the expected position from the virtual model, thereby correcting measurement values without physically stiffening the probe.
3Measurement precision
If the arrangement structure is made rigid to prevent thermal expansion or mechanical bending, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the need for extremely rigid mechanical structures with sensor-based compensation systems. Instead of designing structures that are inherently immune to thermal expansion or mechanical bending, the system uses temperature sensors, strain gauges, or displacement sensors to detect changes and mathematically compensate for their effects, thereby achieving high precision without excessive mechanical rigidity.
Solution Approach 2:
The patent monitors and compensates for changes in physical parameters such as temperature, stress, and position. By continuously measuring these parameters and using them to correct measurement values, the system maintains accuracy despite variations in environmental conditions or mechanical loads, avoiding the need for overly complex temperature-controlled or stress-free mechanical designs.
Data Source
AI summary
An arrangement measures coordinates of a workpiece and/or machines the workpiece. The arrangement has a first part and a second part that can be moved relative to the first part. The relative mobility of the first and second parts is specified in addition to a possible mobility of a probe that is optionally additionally fixed to the arrangement. The mobility of the probe is specified by a deflection of the probe from a neutral position during a mechanical probing of the workpiece for the purpose of measuring the coordinates. A measuring body is arranged on the first or second part, and at least one sensor is arranged on the other part, i.e. on the second or first part. The sensor generates a measurement signal corresponding to a position of the measuring body and thus corresponding to the relative position of the first and second part.