Multi-line Optical Scanning for Measurement Accuracy
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Solution Overview
Problem
Existing methods for optically checking measurement objects, such as test tubes and syringes, face inaccuracies due to varying distances and angles, leading to limited measurement success and inefficient data exploitation.
Innovation Solution
A method involving rotating the measurement object about an axis while simultaneously scanning it with multiple image lines, combining line images to form composite images, and performing feature analysis to classify defects, which appear in single or multiple composite images depending on their type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a test tube is rotated and scanned using a CCD sensor array with signal weighting, then measurement data is obtained, but measurement precision deteriorates because positions on the test tube surface appear at different distances and angles
Solution Approach 1:
The patent transitions from single-point or single-line scanning to multi-line simultaneous scanning across the object surface. By capturing multiple measurement lines at different angular positions simultaneously, the system obtains comprehensive surface data without the precision loss that occurs when scanning single points sequentially during rotation.
Solution Approach 2:
The patent combines multiple measurement lines into a single composite image, merging data from different angular positions and distances. This integration allows simultaneous analysis of the entire object surface, eliminating the need for complex weighting calculations and achieving consistent measurement precision across all surface positions.
2Manufacturing precision
If central perspective imaging is used to generate an image of a strand, then the diameter can be determined from intensity profiles, but measurement precision deteriorates due to varying depths and angles of recorded data
Solution Approach 1:
The patent employs multi-line scanning that captures measurement data from multiple angular dimensions simultaneously. This approach creates a more comprehensive spatial representation of the object surface, allowing accurate diameter determination without the perspective distortion problems inherent in single-point central perspective imaging.
3Difficulty of detecting and measuring
If thermographic data is recorded from a measurement object on a conveyor belt, then surface defects can be detected, but data exploitation efficiency deteriorates because different image lines correspond to different distances
Solution Approach 1:
The patent merges multiple measurement lines captured at different distances into a single composite image. This combination consolidates the data from all image lines into one unified representation, dramatically improving data exploitation efficiency while maintaining the ability to detect surface defects across the entire object surface.
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 achieves precise defect detection by minimizing inaccuracies related to angles and distances, providing high information density and efficient data analysis for surface defects like cracks and scratches.
Implementation Method 1
an optical sensor having a number of image lines... capturing at least two spaced-apart measurement lines on the measurement object into respective image lines
Data Source
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AI summary
A method for the optical inspection of a measurement object, comprising rotating the measurement object about an axis of rotation and simultaneously repeatedly scanning the measurement object with an optical sensor having a number of image lines, wherein the scanning comprises capturing at least two spaced-apart measurement lines on the measurement object into respective image lines, wherein at least one image line is assigned to each measurement line and is captured as a line image, and each image line captures the measurement object at a different angle with respect to a surface of the measurement object at a measurement line assigned to that image line; and combining all line images assigned to a measurement line into a respective composite image.