Specular Surface Observation Using Conical Linear Sensor Arrays
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Solution Overview
Problem
Existing methods for observing specular surfaces struggle with high resolution and wide-field applications, often requiring complex digital processing and are not suitable for industrial high-speed inspection due to sensitivity and technical limitations.
Innovation Solution
A device utilizing a radiation source with distinct emission regions and an optical projection system to measure ray deflection, allowing for high-resolution observation of millimetric or submillimetric structural details without significant digital processing, using standard optical elements for robustness and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical devices use diffuse reflection to observe surfaces, then they can capture broad areas, but they cannot achieve millimetric or submillimetric resolution on specular surfaces
Solution Approach 1:
The invention changes the angular parameter of light observation by using a conical arrangement of linear sensors positioned at a specific angle (typically 45 degrees) relative to the illumination direction. This angular parameter change enables the system to capture specular reflections that contain high-resolution surface information, transforming the observation capability from diffuse to specular surface detection while maintaining millimetric or submillimetric resolution
Solution Approach 2:
The invention introduces an intermediary optical system consisting of a conical arrangement of linear sensors and illumination sources. This intermediary structure mediates between the specular surface and the detection system, capturing reflected light at specific angles and directing it to sensors positioned away from the optical axis, thereby enabling high-resolution observation of specular surfaces without direct axial observation
2Measurement precision
If prior art techniques use multiple sensors and successive acquisitions to improve resolution, then measurement precision increases, but device complexity and processing requirements increase significantly
Solution Approach 1:
The invention segments the observation task into multiple angular channels using a conical arrangement of linear sensor arrays, where each sensor captures information from a specific angular direction. This segmentation allows parallel capture of surface information from multiple angles in a single acquisition, achieving high resolution without requiring multiple successive acquisitions or complex stereoscopic systems
Solution Approach 2:
The invention transitions from two-dimensional image capture to three-dimensional angular space utilization by arranging linear sensors in a conical configuration around the optical axis. This dimensional change enables the system to capture surface information from multiple angles simultaneously, achieving high resolution with a single acquisition and reducing device complexity compared to multi-sensor stereoscopic systems
3Measurement precision
If phase contrast imaging or strioscopy techniques are used to observe specular surfaces, then measurement precision improves, but the techniques become difficult or impossible to implement in industrial applications due to sensitivity and technical limitations
Solution Approach 1:
The invention enables the specular surface itself to serve as the observation target without requiring complex intermediary patterns or test cards. By using conical linear sensor arrays to capture specular reflections directly from the surface, the system achieves high-precision surface defect detection that is robust to environmental variations and suitable for industrial implementation, eliminating the sensitivity issues associated with phase contrast and strioscopy techniques
4Measurement precision
If coding image techniques with fringes are used to examine specular surfaces, then surface defects can be detected, but the spatial resolution is limited by the quality and quantity of fringes and requires significant digital processing
Solution Approach 1:
The invention extracts the essential observation function from complex digital processing by using conical linear sensor arrays to directly capture angular information from specular reflections. This extraction eliminates the need for fringe pattern generation, deformation analysis, and extensive digital processing, while maintaining surface defect detection capability through direct geometric observation of reflected light angles
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
Enables simple, high-resolution observation of specular surfaces with reduced digital processing, suitable for industrial high-speed applications, and is cost-effective with low sensitivity to component irregularities, allowing for wide-field observations.
Implementation Method 1
a radiation source (5) with an emission surface (6) which has at least two distinct regions emitting streams of radiation... a projection surface (10) which is linked optically with the object (2) in the exposure zone (3), and which receives radiation as a function of the deflection from the object (2)
Data Source
AI summary
A device for observation, by reflection, of the structural details of an object (2) that exhibits a behavior that is at least partially specular, located in an exposure area, which includes: at least one radiation source with an emission surface (6) possessing at least two distinct zones (26, 27) emitting streams of radiation, where at least one of the characteristics differs from one zone to the next; an optical projection system that is located in line with the radiation source in relation to the exposure zone, in the path of the radiation; an optical exposure system (18) designed to optically link the entry aperture (14) of the optical projection system and the emission surface (6); a projection surface (10) that is linked optically with the object in the exposure zone, and whose received radiation depends on the deflection on the object (2).