Defect Detection Imaging for Aligned Vibration and Optical Views
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Solution Overview
Problem
Conventional defect detection devices face misrecognition issues due to the need for manual comparison of optical, moving, and still images, which can lead to incorrect identification of defects, as non-defect features like steps in the inspection object may appear similar to defects in these images.
Innovation Solution
A defect detection device that simultaneously displays multiple images, including vibration state images and optical images, allowing for easy comparison of positions and features across these images, using an excitation unit, vibration state image creation, optical image acquisition, and display control to align and overlay images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple images (optical, moving, still) are separately acquired and displayed for defect detection, then the reliability of defect detection is improved, but the ease of operation deteriorates due to manual comparison requirements
Solution Approach 1:
The patent merges multiple separate images (optical image, moving image, still image) into a single composite display that shows all images simultaneously in a unified view. This allows operators to compare defect positions across different image types without manually switching between separate displays, thereby maintaining high detection reliability while significantly improving ease of operation.
Solution Approach 2:
The patent adds a spatial dimension to the display by arranging multiple images in a multi-panel layout where each image type occupies a specific region. This dimensional arrangement allows operators to visually correlate defect positions across different image types simultaneously, eliminating the need for manual comparison operations while preserving detection accuracy.
2Measurement precision
If manual comparison of multiple images is required, then the measurement precision of defect position is improved, but the loss of time increases due to operator operations
Solution Approach 1:
The patent combines multiple images into a single simultaneous display, allowing operators to visually correlate defect positions across optical, moving, and still images without sequential switching. This maintains precise defect position measurement while eliminating the time loss associated with manual image comparison operations.
Solution Approach 2:
The patent performs preliminary alignment and positioning of multiple images before display, ensuring that corresponding regions are already matched. This preliminary action allows operators to directly compare defect positions across images without spending time on manual alignment, thereby maintaining measurement precision while reducing time loss.
3Device complexity
If separate display of vibration state images and optical images is used, then the device complexity is reduced, but the ease of operation deteriorates due to position matching requirements
Solution Approach 1:
The patent merges the display of vibration state images and optical images into a unified composite display that shows both image types simultaneously with automatic position correspondence. This maintains simple device architecture while eliminating the need for manual position matching operations, as the system automatically aligns corresponding regions across different image types.
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
Facilitates accurate defect detection by enabling simultaneous display and comparison of vibration state and optical images, reducing misrecognition and enhancing the reliability of defect identification.
Implementation Method 1
an excitation unit configured to apply vibration to an inspection object
Implementation Method 2
an interference pattern is obtained with light reflected at each point on the surface of the inspection object
Implementation Method 3
an interference pattern is obtained with light reflected at each point on the surface of the inspection object in the inspection area and the reference light
Implementation Method 4
strobe illumination that flashes in synchronization with the elastic wave
Data Source
AI summary
A defect detection device includes: an excitation unit configured to apply vibration to an inspection object; a vibration state image creation unit configured to measure by an optical means a vibration state in a measurement area on a surface of the inspection object to which the vibration is applied, and to create one or more types of vibration state images representing the vibration state in the measurement area depending on a result of the measurement; an optical image acquisition unit configured to acquire an optical image in the measurement area; an image display unit configured to display an image; and a display control unit configured to perform control to simultaneously display two images among the one or more types of vibration state images and the optical image for the same area in the measurement area on the image display unit.