Straightness Correction for Surface Texture Measuring Instruments
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Solution Overview
Problem
The existing surface texture measuring instruments face challenges in maintaining high accuracy when the detector's posture changes during measurement, as the correction methods previously proposed do not effectively account for variations in the drive unit's straightness accuracy due to detector rotation.
Innovation Solution
A straightness correcting method for surface texture measuring instruments that involves storing detector correction data for various movement positions and postures, allowing for real-time correction of measurement data based on the detector's posture, ensuring accurate measurements even when the detector is rotated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the detector is rotated to measure different surface orientations, then the measurement versatility is improved, but the straightness accuracy of the drive unit varies depending on the measurement posture
Solution Approach 1:
The patent performs preliminary measurement of the optical flat at multiple detector rotation angles to generate correction data for each posture before actual measurement operations. This preliminary action allows the system to pre-characterize the drive unit's straightness deviations at different orientations, enabling accurate compensation during subsequent measurements without requiring real-time complex calculations.
Solution Approach 2:
The patent uses the measured deviations from the optical flat at different detector angles as feedback to generate correction data, which is then applied to compensate for the drive unit's straightness inaccuracies during actual measurements. This feedback mechanism allows the system to adapt to posture-dependent straightness variations and maintain measurement accuracy across different measurement orientations.
2Measurement precision
If correction data is stored for every movement position and detector posture, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent segments the correction data into discrete entries corresponding to specific detector rotation angles and movement positions. Instead of storing a single complex correction matrix for all postures, the system divides the correction information into manageable segments (correction data for each angle position), which simplifies both storage and retrieval operations while maintaining precision.
Solution Approach 2:
The patent organizes correction data by changing the parameter of detector rotation angle, storing correction information separately for each discrete angle position. This parameter-based organization allows the system to retrieve only the relevant correction data for the current detector posture, reducing the effective data size needed for active measurements while preserving comprehensive correction capability.
Data Source
AI summary
A surface texture measuring instrument is provided that is capable of performing a correction operation depending on the rotation angle position of a detector even when the detector is rotated for measurement.