Laser Taggant Embedment for Covert Surface Authentication
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Solution Overview
Problem
Current methods for authenticating high-value articles are vulnerable to counterfeiting, as overt security features can be easily detected and defeated, while covert features require custom equipment and are not always effective.
Innovation Solution
A method involving the application and fusion of luminescent taggant particles onto a solid substrate using a laser beam, creating embedded patterns that can only be detected through purpose-built detectors, providing a secure and unique authentication mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If luminescent taggant particles are applied on the surface of a solid substrate, then authentication capability is improved, but the particles can be easily removed by cleaning or mechanical processes
Solution Approach 1:
The laser beam is directed at the substrate surface before final authentication to pre-treat the surface and create conditions for particle embedding. The laser energy modifies the surface properties in advance, enabling subsequent particle attachment or embedding that resists removal by cleaning processes.
Solution Approach 2:
The patent replaces mechanical particle attachment methods with laser-based energy field interaction. Instead of using adhesives or physical anchoring that can be removed by mechanical cleaning, the laser creates electromagnetic field effects that bond particles to the surface in a non-mechanical manner, making them resistant to mechanical removal processes.
2Stability of the object's composition
If a laser beam is used to fuse particles into the substrate surface, then particle immobilization is improved, but energy consumption increases
Solution Approach 1:
The laser beam is directed at specific localized areas of the substrate surface rather than treating the entire surface uniformly. This localized treatment creates fusion zones only where particles need to be immobilized, reducing overall energy consumption while achieving effective particle anchoring at critical authentication locations.
Solution Approach 2:
The laser treatment is applied partially to only the necessary portions of the substrate surface where authentication features are needed. This partial action approach avoids excessive energy consumption by treating only the minimal required areas rather than the entire substrate surface, balancing immobilization effectiveness with energy efficiency.
3Reliability
If the laser beam is directed to fuse particles into the entire surface, then authentication coverage is improved, but processing time increases
Solution Approach 1:
The substrate surface is divided into multiple discrete treatment zones or regions, each receiving laser treatment independently. This segmentation allows parallel or sequential processing of different areas, reducing overall processing time while maintaining comprehensive authentication coverage across the entire surface through systematic zone-by-zone treatment.
Solution Approach 2:
The laser beam is applied in periodic pulses or intermittent bursts rather than continuous irradiation. This periodic action allows brief intervals between laser pulses for heat dissipation and material response, enabling effective particle fusion across the entire surface while minimizing total processing time through efficient on-off cycling of the laser energy delivery.
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
The method effectively immobilizes luminescent taggant particles within the substrate, resisting cleaning and mechanical processes, and allows for the encoding of information through patterns, enhancing the authentication process and preventing counterfeiting.
Implementation Method 1
the laser beam has power sufficient to cause at least a portion of the particles upon which it is incident to be fused into the surface of the solid substrate
Implementation Method 2
the laser beam has power sufficient to cause at least a portion of the particles upon which it is incident to be fused into the surface
Implementation Method 3
a luminescent taggant composition fused (or otherwise intimately constrained or embedded) into a surface of the substrate with laser energy. The taggant composition contains a phosphor
Implementation Method 4
The taggant composition contains a phosphor, which can comprise a transition metal or a rare-earth element
Data Source
AI summary
A laser-assisted method embeds luminescent taggant particles in the surface of a substrate to provide a covert method of evaluating the authenticity of articles so treated.