Single-Side Luminescence Detection for Value Document Verification
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Solution Overview
Problem
Existing methods for checking the authenticity of value documents with luminescent features applied to one side are cumbersome due to the need for sensors on opposite sides of the transport path, leading to increased construction and space requirements, and difficulty in handling non-uniformly distributed or single-sided luminescent substances.
Innovation Solution
A method and apparatus where the excitation device and capture device are positioned on the same side of the value document, allowing for luminescence radiation to be excited and captured through the substrate, enabling efficient checking of luminescent properties regardless of document orientation, without the need for sensors on opposite sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors are disposed on opposite sides of the transport path to check single-sided luminescent features, then the checking capability for single-sided luminescent substances is improved, but the device complexity and space requirements increase
Solution Approach 1:
Instead of placing the detector on the opposite side from the excitation source (conventional approach), the patent inverts this arrangement by placing both the excitation source and detector on the same side of the transport path. This allows the excitation radiation to pass through the substrate and excite luminescent substances on the far side, with the emitted luminescence being detected after passing back through the substrate, thereby simplifying the sensor arrangement while maintaining checking capability for single-sided luminescent features
2Adaptability or versatility
If sensors are disposed on opposite sides of the transport path, then the checking of single-sided luminescent features is enabled, but the construction and installation effort increases
Solution Approach 1:
The patent merges the excitation source and detector into the same side assembly, combining two previously separate components (excitation source on one side, detector on the other) into a single integrated unit. This reduces the number of separate installations needed and simplifies the overall construction process while maintaining the ability to check single-sided luminescent features
3Measurement precision
If excitation radiation intensity is increased to improve luminescence detection, then the measurement sensitivity is improved, but the luminescent substance may be damaged or degraded
Solution Approach 1:
The substrate acts as an intermediary that transmits the excitation radiation to the luminescent substance on its far side while protecting the substance from excessive radiation intensity. The substrate's optical properties allow it to transmit sufficient excitation energy while diffusing and moderating the radiation, preventing direct high-intensity exposure that could damage the luminescent material
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 simplifies the checking process, reduces space and construction requirements, and allows for flexible use in handling documents with luminescent substances applied to one side, enhancing the accuracy and efficiency of authenticity verification.
Implementation Method 1
irradiating, by means of an excitation device, at least a section of a first side of the value document with excitation radiation for exciting luminescence of the luminescent substance
Implementation Method 2
exciting luminescence of the luminescent substance, the first side being the back side of the value document
Implementation Method 3
capturing luminescence radiation which was excited by excitation of the luminescent substance at the front side of the value document
Implementation Method 4
at least a part of the excitation radiation after transmission through the substrate of the value document
Data Source
AI summary
A method for checking value documents involves the steps of: irradiating, by an excitation device, a first side of the value document with excitation radiation for exciting luminescence of a luminescent substance on the value document, such that the first side is a back side of the value document, capturing luminescence radiation which was excited by excitation of the luminescent substance at a front side of the value document by at least a part of the excitation radiation after transmission through the substrate of the value document and exits the value document at least partly at the back side of the value document after transmission through the value document, by a capture device, and checking the value document in dependence on at least one property of the captured luminescence radiation by means of an evaluation device.