Spectral Signature Authentication Using Fluorescent Security Markers
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Solution Overview
Problem
Conventional barcode systems lack uniqueness and ease of replication, making it difficult to authenticate the authenticity and provenance of articles, especially in counterfeit scenarios, and existing security features are often costly and not widely applicable due to the need for specialized detectors.
Innovation Solution
A coded security marker with preselected color features producing a unique spectral signature under narrowband electromagnetic wavelengths, which can be used to authenticate articles by comparing the spectral signature of a test article with a recorded signature, and an optoelectronic scanner system for detecting these markers using LEDs and a CCD array to generate and compare spectral responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional barcodes (1D or 2D) are used for tracking and auditing, then stock management is enabled, but the barcodes can be wantonly replicated and provide no guarantee of article authenticity
Solution Approach 1:
The patent applies color-coded barcodes using CMYK (cyan, magenta, yellow, key/black) color models to encode additional data beyond binary values. Each color represents specific information, enabling enhanced authentication capabilities. The use of multiple colors allows the system to distinguish between genuine and counterfeit articles through spectral analysis while maintaining compatibility with standard barcode structures.
Solution Approach 2:
The patent changes the physical parameters of the barcode by incorporating fluorescent materials that emit specific wavelengths under UV illumination. This parameter change enables authentication through spectral signature analysis, where genuine articles exhibit specific fluorescence patterns that counterfeit articles cannot replicate. The system measures intensity ratios at different wavelengths to verify authenticity.
2Loss of information
If high capacity colour barcodes (HCCB) are used to encode additional data, then data capacity is increased, but specialized detectors and complex analysis are required
Solution Approach 1:
The patent designs the color barcode system to be universally readable by both standard barcode scanners and specialized spectral analysis devices. The CMYK color encoding can be interpreted by general-purpose imaging devices while also containing embedded authentication data detectable by UV illumination and spectral analysis. This multi-functionality allows the same marker to serve both tracking and authentication purposes without requiring entirely separate systems.
Solution Approach 2:
The patent introduces fluorescent materials as intermediaries that convert UV illumination into visible spectral signatures. These fluorescent markers absorb UV light and emit at specific wavelengths characteristic of the genuine article. This intermediary mechanism enables authentication through a relatively simple UV lamp and photodetector setup rather than requiring complex spectral analysis equipment, bridging the gap between data capacity and detection simplicity.
3Reliability
If duty stamps with UV fluorescence are used for security, then basic visual inspection is enabled, but the detection requires UV light sources and is limited to specific applications
Solution Approach 1:
The patent extends the duty stamp concept into a universal color barcode system that can be applied across multiple industries including pharmaceuticals, consumer goods, and logistics. The same CMYK color encoding and fluorescent authentication mechanism works for diverse applications from small packages to large containers. The system adapts to different needs by varying the color patterns and data encoding while maintaining the core authentication principle.
Solution Approach 2:
The patent replaces the manual visual inspection of UV-fluorescing duty stamps with automated optical detection systems. Instead of requiring human operators to examine fluorescence under UV light, the system uses photodetectors and spectral analysis to automatically verify authentication markers. This substitution enables high-speed verification at production lines and point-of-sale while maintaining security, making the system adaptable to automated manufacturing and retail environments.
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
Provides a robust, cost-effective, and widely applicable method for authenticating articles, allowing for near-instantaneous verification of authenticity using existing scanning equipment and software, with the ability to track origin, expiry, and manufacturing details, and is suitable for various applications including banknotes and pharmaceuticals.
Implementation Method 1
an array of multiple narrowband electromagnetic sources arranged to produce, on a time-controlled basis, a plurality of narrowband electromagnetic wavelengths
Implementation Method 2
one or more preselected colour features having known and preselected spectral characteristics knowingly discernible under incident narrowband electromagnetic wavelengths selected from a range between about middle/near ultraviolet to about near infra-red, the spectral characteristics producing a unique and known spectral signature
Data Source
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AI summary
A scanner (200) is arranged to detect a unique spectral signature acquired from a sample (230) coded with a security marker (700) made up from one or more overt or covert coloured features (704a-704b) having known and uniquely identifiable spectral characteristics. More particularly, a narrowband light source (218), operating in the middle/near ultraviolet to short/near infra-red wavelength ranges, pulses light onto the security marker fixed to or formed in the sample (230). A lens system (222, 216) collects spectral data for analysis by a processing engine (201), such as a smartphone. The light source (218), which may be an array of differently coloured LEDs (224), selectively illuminates the security marker with discrete wavelengths as LEDs are selectively energized. The coloured features (704a-704d) are realized by combinations of dyes, pigments or inks that may fluoresce that are difficult to replicate and therefore typically pantone-based. The coloured features each have unique spectral responses, i.e. spectral characteristics, in the presence of incident EM radiation, so coding a bona fide product with a security marker made up from pre-selected coloured features producing the unique signature allows validation of the product. Specifically, by using the scanner and executing analysis code, the processing engine (201) is configured to make a quick comparison of the spectral peak and trough data acquired from the security marker against stored reference spectral signature corresponding to the marker on the product and to provide an indication (or not) of correspondence.