Optical Inspection of Transparent Bodies via Rotating Imaging and Difference Analysis
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Solution Overview
Problem
Existing optical examination methods for transparent bodies, such as plastics and glass, struggle to distinguish between defects in the body and interferences in the optical system, leading to reduced accuracy and increased false rejects, as well as difficulty in analyzing certain defects like cracks visible only under specific angles.
Innovation Solution
A method involving a rotating optical imaging device and a computer unit that captures overlapping images of the body, generates difference images by subtracting successive images, and analyzes these images to differentiate between body-related defects and system-related interferences, allowing for enhanced accuracy and detection of defects that were previously uncertain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical imaging methods are used to examine transparent bodies, then the examination process is simple, but system-related interferences (such as lint on the lens) cannot be distinguished from actual defects in the body, leading to false rejects
Solution Approach 1:
The patent creates a reference image before examining the actual body to capture system-related interferences. This preliminary action allows the system to distinguish between actual defects and artifacts, thereby improving measurement precision without requiring complex real-time differentiation during the main examination process.
Solution Approach 2:
The reference image serves as an intermediary that mediates between the optical system and the body being examined. By comparing the test image against this intermediary reference, the system can identify and eliminate false positives caused by system interferences, thus improving defect detection accuracy.
2Adaptability or versatility
If multiple imaging devices are used to capture images from different angles, then defects visible only under specific angles can be detected, but the device complexity and cost increase
Solution Approach 1:
The patent employs a rotating body mechanism that dynamically changes the orientation of the examined object relative to the stationary imaging device. This dynamic approach allows a single imaging device to capture defects from multiple angles by rotating the body, achieving the versatility of multiple imaging devices without the corresponding increase in device complexity.
Solution Approach 2:
A single imaging device is made multi-functional through the rotation mechanism, allowing it to perform the function of multiple fixed imaging devices. The same imaging device can capture images from different angles by examining the body at different rotational positions, thereby achieving universal defect detection coverage without requiring multiple specialized devices.
3Device complexity
If the optical imaging device is stationary and the body is rotated, then the system structure is simplified, but defects may be missed if the body does not rotate sufficiently or uniformly
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor the rotational position and uniformity of the body during examination. This feedback allows the system to adjust the examination process accordingly, ensuring that all potential defect locations are captured despite variations in rotation, thereby maintaining high detection reliability while keeping the system structure simple.
Solution Approach 2:
The system performs preliminary examinations at multiple rotational positions to ensure complete coverage before making final defect determination. This preliminary multi-angle sampling ensures that no defects are missed due to insufficient or non-uniform rotation, while the stationary imaging device maintains structural simplicity.
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 significantly improves the accuracy of optical examinations by eliminating system-related false positives and enabling reliable detection of defects, including those previously difficult to identify, by distinguishing between body-related and system-related issues, thereby enhancing the efficiency of the inspection process.
Implementation Method 1
If the radiation penetrates into the object and is reflected, absorbed or scattered on structures in the interior thereof, it is possible to additionally obtain information about the full three-dimensional internal structure and about the surface shape.
Data Source
AI summary
A method and a device for optical examination of transparent bodies made of plastic, glass, or glass ceramic are provided. The examination is carried out by contactless detection and measurement of the body using optical imaging devices. For this purpose, a plurality of individual images are taken of the body during the examination in different positions relative to the imaging device, which are subsequently analyzed.