Workshop Measurement Positioning System Accuracy Traceability
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Solution Overview
Problem
Traditional on-site accuracy traceability methods for large-scale workshop Measurement Positioning Systems (wMPS) face challenges with measurement error increase due to distance, inconvenient device handling, low flexibility, and poor adaptability in large-scale workspaces, lacking reliable traceability standards.
Innovation Solution
The method employs a precision coordinate control network utilizing laser trackers for accurate range measurement, establishing a network of globally controlled points and stations to improve measurement accuracy and adaptability, with SMR nests and dynamic weighting for optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional standard devices are used for on-site accuracy traceability, then measurement standards are established, but device portability and measurement flexibility deteriorate
Solution Approach 1:
The patent replaces traditional mechanical standard devices with a laser-based measurement system. The laser tracker uses optical fields instead of mechanical contact to establish measurement standards, enabling accurate traceability without physical standard artifacts. This substitution achieves both high measurement accuracy and device portability, as the laser system can be easily transported and set up in different locations.
Solution Approach 2:
The patent introduces laser wavelength as an intermediary standard for accuracy traceability. Instead of directly using physical standard devices, the system uses laser wavelength (which can be traced to fundamental physical constants) as an intermediate reference. This intermediary approach enables accurate measurement traceability while maintaining device portability and flexibility.
2Area of stationary object
If measurement distance increases in wMPS, then measurement space coverage improves, but measurement error increases significantly
Solution Approach 1:
The patent implements a feedback mechanism where laser trackers measure global control points at known positions throughout the measurement space. These measurements provide feedback information about the actual positions of control points, which is then used to calculate correction values. These corrections are applied to compensate for measurement errors in the wMPS, enabling accurate measurements over large distances while maintaining full space coverage.
Solution Approach 2:
The patent performs preliminary measurements of global control points using laser trackers before conducting the main wMPS measurements. This preliminary action establishes a reference framework of accurate control point positions that will be used to correct subsequent measurements. By preparing this reference framework in advance, the system can compensate for distance-related errors in the main measurement process.
3Extent of automation
If photoelectric-scanning spatial angle intersection is used for coordinate measurement, then automatic location is achieved, but measurement accuracy deteriorates with distance
Solution Approach 1:
The patent introduces laser tracker range measurements as an intermediary constraint to improve coordinate accuracy. The laser tracker provides accurate distance measurements to global control points, which serve as an intermediary reference. This intermediary distance information constrains the photoelectric-scanning angle intersection calculations, preventing error accumulation and maintaining coordinate accuracy even at large measurement distances while preserving automatic location capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances measurement accuracy and adaptability by using laser tracker range measurements as constraints, enabling accurate 3D coordinate tracing and improving wMPS reliability and efficiency.
Implementation Method 1
The present invention takes advantages of accurate range measurement of laser tracker as a constraint to achieve the followings: obtaining a high accuracy 3-d coordinates of global control points
Implementation Method 2
its interferometer range measurement can be traceable to laser wavelength
Implementation Method 3
the wMPS adopts a plurality of transmitters 101 to constitute the measurement network, applies photoelectric-scanning spatial angle intersection to automatically locate the individual receiver 102
Data Source
AI summary
The present invention relates to an accuracy traceability method based on precision coordinates control network for workshop Measurement Positioning System, which includes the steps: setting a plurality of SMR (Spherically Mounted Retroreflector) nests and stations in the measurement space; forming a global control point by using SMR; measuring all the 3-d coordinates of global control points in all the laser tracker stations; using the range value measured by the laser tracker as constraints to calculate the 3-d coordinates of global control points by using the dynamic weighting method; arranging a plurality of transmitters and calibrating the transmitters in combination with precision coordinate control network; measuring all global control points and measured points simultaneously by using wMPS, and using the 3-d coordinates of global control points as the constraints for adjustment calculation to obtain the 3-d coordinates of the measured points. The present invention takes advantages of accurate range measurement of laser tracker as a constraint to achieve the followings: obtaining high accuracy 3-d coordinates of global control points, constructing precision coordinate control network and using it as the measurement standards of wMPS, achieving on-site accuracy traceability, and thus improving the measurement accuracy of wMPS.