Spectral Surface Inspection for Objective Component Defect Detection
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Solution Overview
Problem
Existing methods for determining surface quality, such as penetrant testing, acoustic testing, and X-ray inspection, are prone to human error, require complex equipment, or are costly and time-consuming, making them unsuitable for efficient inline measurement in manufacturing processes.
Innovation Solution
A spatially resolved spectral analysis system using detectors and an electronic evaluation unit to create a multidimensional image of a component surface, allowing for objective defect detection and quantification, utilizing electromagnetic radiation and regression models to analyze surface properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If penetrant testing with fluorescent crack detection oil is used, then surface defect detection is achieved, but subjective errors by testing personnel occur and measurement objectivity deteriorates
Solution Approach 1:
The patent replaces the manual visual inspection method (mechanical/human system) with an automated optical detection system using cameras and image processing algorithms. The system captures images of fluorescent defects and automatically analyzes them, eliminating subjective human errors while maintaining high detection accuracy through standardized imaging and computational analysis.
Solution Approach 2:
The system enables self-service by allowing the measurement system to automatically evaluate surface defects without human intervention. The automated image analysis and defect characterization algorithms independently process the fluorescent defect images, generating objective measurements of defect size, shape, and distribution without requiring operator judgment.
2Measurement precision
If acoustic testing with transducers is used, then surface defect detection is achieved, but equipment complexity increases and measurement time extends
Solution Approach 1:
The patent replaces complex acoustic testing equipment (transducers, coupling media, sophisticated signal processing hardware) with a simpler optical system. The optical detection method uses standard imaging cameras and fluorescent materials, eliminating the need for complex mechanical coupling and acoustic signal processing while achieving comparable or superior detection capability.
Solution Approach 2:
The system changes the detection parameter from acoustic wave reflection to optical fluorescence emission. This parameter change allows the use of simpler optical components instead of complex acoustic transducers, reducing equipment complexity while maintaining sensitivity to surface defects through the high-contrast fluorescent signal.
3Measurement precision
If X-ray inspection is used, then surface defect detection is achieved, but cost increases and radiation protection requirements arise
Solution Approach 1:
The patent replaces X-ray inspection (ionizing radiation) with optical fluorescence detection using non-ionizing electromagnetic radiation in the visible or UV range. This substitution eliminates radiation protection requirements and associated safety infrastructure while maintaining effective surface defect detection through the fluorescent contrast mechanism.
Solution Approach 2:
The system uses inexpensive fluorescent crack detection oil and standard optical cameras instead of expensive X-ray equipment. The fluorescent materials are low-cost consumables that can be easily applied and disposed of, replacing the high capital investment and ongoing maintenance costs of X-ray systems.
4Measurement precision
If traditional inspection methods are used, then surface quality assessment is achieved, but measurement time extends and productivity decreases
Solution Approach 1:
The patent enables continuous inspection by capturing images of the entire surface area in a single scan or continuous motion sequence. The system processes images in real-time as the component moves through the inspection zone, allowing uninterrupted measurement without the stop-and-inspect cycle of traditional methods, thereby maintaining high productivity.
Solution Approach 2:
The system transitions from point-by-point or line-by-line inspection to area-wide parallel imaging. By capturing the entire surface or large portions of it in single images, the system achieves dimensional expansion in measurement coverage, allowing simultaneous assessment of multiple defects across the surface without sequential scanning delays.
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 rapid, non-destructive, and accurate determination of surface quality, reducing human subjectivity and equipment complexity, suitable for inline manufacturing processes.
Implementation Method 1
Components of a material that can be excited to fluorescence when irradiated with electromagnetic radiation of at least one wavelength remain in areas where depressions, particularly cracks, are present
Implementation Method 2
electromagnetic radiation emitted by a broadband radiation source impinges on the detectors either after being reflected from the surface of a component
Implementation Method 3
after passing through a component transparent to the electromagnetic radiation
Data Source
AI summary
The invention relates to an arrangement for determining the surface quality of component surfaces, in particular defects, wherein a plurality of detectors are formed for spatially resolved spectral analysis of electromagnetic radiation within a wavelength interval. The detectors are arranged in rows or in a row and column arrangement and are connected to an electronic evaluation unit and arranged such that electromagnetic radiation emitted by a broadband radiation source either, after reflection on the surface of a component, a layer formed on the surface of a component, or after penetration of a component which is transparent for the electromagnetic radiation, impinges on the detectors. By means of the measurement signals detected for individual locations a multi-dimensional image of the irradiated surface is created and a data reduction is carried out, such that a conclusion about the surface quality is achieved.