Calibration Plate Position Measurement Error Correction
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Solution Overview
Problem
Existing measurement techniques fail to accurately correct for measurement errors caused by insufficient rigidity of the device when a measurement target and an imaging device are moved relative to each other, leading to inaccuracies in position measurement.
Innovation Solution
A position measurement method that uses an imaging unit and a position detector to measure the position coordinates of a measurement point, where correction values are obtained based on the difference between actual and true values of indices on a calibration plate, and applied to correct detection values from the position detector, taking into account the moving direction or route of the imaging unit or measurement target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the imaging unit or measurement target is moved to change measurement points, then measurement coverage is improved, but measurement accuracy deteriorates due to insufficient rigidity causing deformation
Solution Approach 1:
The patent applies preliminary action by pre-obtaining correction values through calibration before actual measurement. The calibration process stores correction data that compensates for rigidity-induced errors, allowing accurate measurements even when the imaging unit or target moves to different positions. This pre-prepared correction data is then applied during measurement to maintain accuracy across the full measurement range.
2Measurement precision
If correction values are obtained for multiple moving directions, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by organizing correction values according to moving direction parameters. Different correction values are stored for different moving directions (X-axis, Y-axis, etc.), allowing the system to select the appropriate correction based on the current movement direction. This parameter-based organization enables accurate correction without requiring complex real-time calculation or additional hardware.
Data Source
AI summary
A position measurement method is used by a device including an imaging unit and a position detector that detects a position of the imaging unit to measure, using a detection value at imaging of a measurement point, position coordinates of the measurement point. The method for correcting the detection value from the position detector includes obtaining, with the device, position coordinates of predetermined indices (22) arranged two-dimensionally on a calibration plate (20) as an actual measurement value, obtaining, as a correction value, a difference between the actual measurement value and a true value resulting from transformation of position coordinates of the indices (22) with respect to a reference point on the calibration plate (20), and correcting the detection value from the position detector (8, 9, 10). The imaging unit (3) images measurement points (P) on the measurement target (3) to measure position coordinates of the measurement points (P).