Surface Shape Measurement Device Vibration Error Correction
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Solution Overview
Problem
Existing surface shape measurement devices face errors due to positional deviation and vibration during scanning, which is challenging to mitigate with conventional vibration isolation and soundproofing methods, especially in constrained industrial settings.
Innovation Solution
A surface shape measurement device and method that employs a dual-image capturing system, where one system scans the object vertically and the other captures images of the object or its support in synchronization, allowing for displacement detection and coordinate system transformation to correct for measurement errors caused by vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration isolation tables or wind proof covers are installed to block vibration, then measurement precision is improved, but device complexity and spatial constraints increase
Solution Approach 1:
The patent replaces mechanical vibration isolation systems (vibration isolation tables, wind proof covers) with an optical measurement approach. The measurement device captures images at multiple focal positions and uses image processing to calculate height information, thereby measuring surface shape without requiring mechanical stabilization of the measurement device itself. This substitution eliminates the need for complex mechanical vibration isolation while achieving high measurement precision.
Solution Approach 2:
The patent uses image copying to overcome vibration issues. By capturing multiple images at different focal positions and processing these optical copies, the system can reconstruct accurate height information without requiring the physical measurement device to be free from vibration. The measurement is performed on optical representations rather than requiring physical stability.
2Measurement precision
If scanning measurement is performed to measure three-dimensional shape, then measurement precision is improved, but reliability deteriorates due to positional deviation and vibration during scanning
Solution Approach 1:
The patent segments the measurement process into multiple discrete focal position measurements. Instead of relying on continuous scanning stability, the system captures images at multiple predetermined focal positions and processes these segmented measurements to reconstruct the complete surface shape. This segmentation allows each measurement to be independent and less sensitive to vibration during scanning.
Solution Approach 2:
The patent replaces the mechanical scanning system with an optical field-based measurement approach. By using a plurality of focal positions and processing optical images rather than relying on mechanical scanning stability, the system achieves reliable measurements even when positional deviation or vibration occurs during the measurement process.
3Measurement precision
If conventional vibration mitigation methods are used, then measurement precision is improved, but ease of operation deteriorates due to installation constraints in processing machines and factory lines
Solution Approach 1:
The patent replaces mechanical vibration mitigation infrastructure (vibration isolation tables, soundproof rooms) with an optical measurement system that is inherently insensitive to vibration. The measurement device can be directly installed in processing machines and factory lines without requiring special vibration isolation facilities, thereby improving ease of operation while maintaining measurement precision.
Solution Approach 2:
The measurement device is designed to be universally applicable in various industrial environments including processing machines and factory lines. By using optical field-based measurement rather than mechanical stabilization, the device can be deployed in diverse locations without requiring specialized vibration-controlled environments, enhancing its versatility and ease of installation.
Data Source
AI summary
A surface shape measurement device includes: a first image capturing system configured to capture a first captured image of a measurement object while scanning relative to the measurement object; a second image capturing system that is separate from the first image capturing system and configured to capture a second captured image of the measurement object or a support body thereof in synchronization with the first image capturing system; a calculating unit configured to calculate a surface shape of the measurement object based on first captured images; a storage unit configured to store coordinate system transformation information for transforming a second coordinate system to a first coordinate system; a displacement detecting unit configured to detect displacement of the measurement object based on second captured images; and a correcting unit configured to correct the surface shape based on a detection result of the displacement and on the coordinate system transformation information.