Image Measuring System Path Planning for Angular Position Accuracy
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Solution Overview
Problem
Conventional image measuring machines with non-stop measurement modes face accuracy issues and mechanical overload when measuring positions are not in a straight line, leading to potential measurement inaccuracies and protective fuse failures due to vibrations.
Innovation Solution
The method involves forming an overshoot path and adjusting the relative movement speed of the imaging means based on the angle between measurement positions, preventing the measurement position from becoming a folded point on the movement path and reducing the movement mechanism's load by slowing down as the angle increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-stop measurement mode is used to improve measurement throughput, then productivity is improved, but measurement precision deteriorates due to vibrations and folded points in the movement path
Solution Approach 1:
The system performs preliminary calculation of movement paths and speeds before actual measurement. It pre-determines overshoot paths and speed adjustments based on angular relationships between measurement positions, so that when measurement occurs, the imaging means follows the pre-planned path that avoids folded points and minimizes vibrations, thereby maintaining both high throughput and measurement precision
Solution Approach 2:
The system dynamically adjusts the movement speed of the imaging means based on the angular relationship between consecutive measurement positions. When the angle is large, the system reduces speed to prevent vibrations and folded points; when the angle is small, it maintains higher speed for efficiency. This dynamic speed control allows the system to adapt to different measurement geometries and maintain measurement quality across all positions
2Productivity
If the imaging means moves at high speed between measurement positions, then productivity is improved, but the movement mechanism becomes overloaded and protective fuse may blow
Solution Approach 1:
The system changes the speed parameter of the imaging means movement based on the angular relationship between measurement positions. By calculating the angle and adjusting speed accordingly, the system ensures that high speeds are only used when safe (small angles), while reducing speed for large angles to prevent mechanical overload and fuse blowout, thus maintaining both productivity and reliability
3Adaptability or versatility
If the imaging means changes direction sharply at measurement positions, then measurement coverage is improved, but vibrations increase and measurement accuracy deteriorates
Solution Approach 1:
The system pre-calculates the movement path including overshoot paths before measurement begins. By determining the optimal path in advance based on the arrangement of measurement positions, the system avoids sharp turns and folded points during actual measurement, thereby maintaining measurement accuracy while still covering all required positions
Solution Approach 2:
The system introduces curved overshoot paths instead of sharp angular turns when changing direction between measurement positions. By using curved trajectories that smoothly transition between directions, the system reduces vibrations and maintains measurement accuracy while still achieving comprehensive coverage of all measurement positions
Data Source
AI summary
An image measuring method comprises making no stop of an imaging means relative to a measurement stage at measurement positions (MP1-MP3), and capturing instantaneous images to acquire information required for measurement. A first direction to a measurement position (MP1) to be measured next and a second direction from the measurement position (MP1) to a next measurement position (MP2) form an angle therebetween. If this angle exceeds a certain angle, an overshoot path is formed at a location beyond the measurement position (MP1) in the first direction. The larger the angle formed between the first direction and the second direction, the lower the measurement speed at the measurement position (MP1) is made.