Valuable Document Foil Authentication With Dual-Wavelength Infrared Signature
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Solution Overview
Problem
Conventional luminescence markers in value documents provide limited protection against composed bank note forgeries, where a foil element is detached from an authentic carrier and applied to a non-authentic substrate, requiring separate methods to identify both types of manipulations.
Innovation Solution
A value document with a carrier element and foil element, featuring a luminescence marker emitting two infrared wavelengths and a foil element with a reflection layer and spectral selection layer, where the inhibition of transmission for each wavelength differs, creating a combined security feature that can be checked with a single sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional luminescence marker is used in the carrier element, then it can protect against simple forgeries, but it provides limited protection against composed bank note forgeries where the foil element is detached and transferred
Solution Approach 1:
The patent combines the luminescence marker in the carrier element with a spectral selection layer and reflection layer in the foil element to create a unified security system. The luminescence marker emits infrared radiation that interacts with the spectral selection layer to produce a characteristic reflection pattern, merging two separate security features into one integrated system that detects both carrier and foil authenticity simultaneously.
Solution Approach 2:
The security system uses composite material structures including the luminescence marker material embedded in the carrier element, combined with the spectral selection layer material and reflection layer material in the foil element. This composite approach creates a security feature with properties that cannot be easily replicated by forgers who would need to reproduce multiple material layers with specific optical interactions.
2Reliability
If separate methods are used to identify manipulated carrier elements and manipulated foil elements, then both types of forgeries can be detected, but the checking process becomes more complex and requires multiple sensors
Solution Approach 1:
The spectral selection layer serves multiple functions: it selectively transmits or reflects specific infrared wavelengths from the luminescence marker, creates a characteristic spectral signature, and enables a single sensor to detect both the presence of the authentic foil element and its proper attachment to the carrier element. This multi-functional layer consolidates what would otherwise require separate detection systems.
Solution Approach 2:
The system uses changes in spectral parameters (wavelength-specific transmission and reflection characteristics) to encode authentication information. The spectral selection layer is designed to interact with specific infrared wavelengths from the luminescence marker, creating a unique spectral fingerprint that a single sensor can read to verify both carrier and foil authenticity simultaneously.
3Adaptability or versatility
If the foil element is made detachable for legitimate purposes, then it can be repositioned or replaced, but it enables composed bank note forgeries
Solution Approach 1:
The patent applies preliminary anti-action by embedding the spectral selection layer within the foil element itself, creating an inherent security mechanism that prevents misuse. Even if the foil element is detached, the spectral selection layer's interaction with the luminescence marker's infrared radiation creates a detectable authentication signal that verifies the foil's legitimate origin and proper attachment, preventing composed bank note forgeries while allowing legitimate repositioning.
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
Enhances forgery resistance by allowing a single method to reliably identify manipulated documents, providing a distinct spectral signature for authentic combinations of carrier and foil elements.
Implementation Method 1
The luminescence marker is adapted to give off luminescence radiation. The luminescence radiation has at least a first wavelength and a second wavelength. The first wavelength and the second wavelength are each configured in the infrared spectral region.
Implementation Method 2
The reflection layer is configured to intentionally reflect infrared radiation.
Implementation Method 3
The selection layer is configured to spectrally selectively inhibit transmission of infrared radiation. The inhibition of the transmission of the first wavelength and the inhibition of the transmission of the second wavelength differ by at least 10%
Data Source
AI summary
A value document with a carrier element and a foil element arranged in a partial region of the carrier element. The carrier element has, at least in the partial region, a luminescence marker which is adapted to give off luminescence radiation which has at least a first wavelength and a second wavelength in each case in the infrared spectral region. The foil element has a reflection layer and a spectral selection layer. The selection layer is arranged between the carrier element and the reflection layer. The reflection layer is configured to reflect infrared radiation and the selection layer is configured to spectrally selectively inhibit transmission of infrared radiation. The inhibition of the transmission of the first wavelength and the inhibition of the transmission of the second wavelength differ by at least 10%.