UV Fluorescent Authentication via Spectral Segmentation
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Solution Overview
Problem
Current authentication methods using ultraviolet fluorescence are vulnerable to sophisticated counterfeiting, as counterfeiters can replicate the hidden identification marks, making it difficult to distinguish genuine from counterfeit articles using high-performance scanners and laboratory equipment.
Innovation Solution
The proposed solution involves a light-activated region on articles that includes multiple layers with specific attributes, such as particle distribution and composition, which emit unique fluorescence signatures when exposed to ultraviolet light, combined with an ultraviolet source and fluorescence sensor system for authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hidden identification marks are printed using ultraviolet-sensitive chemicals, then authentication capability is improved, but counterfeiting sophistication increases making detection difficult
Solution Approach 1:
The authentication system divides the detection process into multiple independent measurement channels by using an array of photocells with different spectral sensitivity characteristics. Each photocell measures a specific wavelength range of the fluorescence emission, creating segmented spectral data that together form a comprehensive authentication signature. This segmentation makes counterfeiting difficult because replicating the exact spectral distribution across multiple wavelengths is significantly more complex than replicating a single visual appearance.
Solution Approach 2:
The system transforms the authentication approach by measuring multiple spectral parameters (wavelength-dependent fluorescence intensities) rather than a single visual parameter. By using photocells with different spectral sensitivities to capture the fluorescence emission spectrum, the system creates a multi-dimensional parameter set for authentication. This parameter transformation from simple visual detection to spectral characterization significantly increases the difficulty of counterfeiting while maintaining reliable authentication.
2Measurement precision
If sophisticated scanning equipment is used to detect counterfeit articles, then detection precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical scanning and laboratory analysis equipment with a simplified optical system based on photoluminescence excitation and detection. Instead of using sophisticated scanners that require complex mechanical movement and positioning, the system uses a stationary array of photocells to simultaneously detect fluorescence emission at multiple wavelengths. This substitution of mechanical scanning with direct optical measurement reduces device complexity while maintaining or improving detection precision through spectral analysis.
3Illumination intensity
If photoluminescent substances are used in labels, then fluorescence contrast is improved, but manufacturing complexity increases
Solution Approach 1:
The system changes the manufacturing approach by specifying photoluminescent substances with particular spectral characteristics (excitation and emission wavelength ranges) rather than requiring complex multi-layer structures or precise physical configurations. By focusing on the optical parameters of the photoluminescent material, the system achieves high fluorescence contrast while simplifying the manufacturing process. The authentication system is designed to work with these spectrally-defined materials, making production more straightforward compared to approaches requiring complex structural arrangements.
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 enhances the difficulty of counterfeiting by creating a distinct fluorescence signature that can be accurately detected, allowing for reliable authentication of genuine articles using a data acquisition component that evaluates the fluorescence signature for authenticity.
Implementation Method 1
particles that can emit fluorescent radiation in response to being radiated with ultraviolet light
Data Source
AI summary
A solution for authenticating an article using a fluorescence signature emitted by the article in response to ultraviolet light is described. The article can include a light activated region that includes particles that can emit fluorescent radiation in response to being radiated with ultraviolet light. The light activated region can include one or more attributes for configuring the ultraviolet light and/or the fluorescent radiation to create the fluorescence signature. An authentication system can include an ultraviolet source, a fluorescent radiation sensor and components for operating each to acquire data used to authenticate the article.