Optical Storage Phosphor Dynamic Time-Resolved Luminescence Verification
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Solution Overview
Problem
Existing authenticity assessment methods for valuable documents using optical storage phosphors are vulnerable to imitation since standard spectroscopy methods can replicate the substances, allowing counterfeiters to recreate them, and lack differentiation between similar features.
Innovation Solution
Employing optical storage phosphors with dynamic time behavior as authenticity features, utilizing measurement processes that create a memory effect, where the order and sequence of charging and readout processes influence the system's behavior, making it path-dependent and specific to the verification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard spectroscopy measurement methods are used to detect optical storage phosphors, then the detection process is simple and reproducible, but the authenticity security is compromised because imitators can characterize and recreate the substances
Solution Approach 1:
The patent transitions from static spectroscopy measurements to dynamic time-resolved measurements. The optical storage phosphor's time-dependent luminescence behavior after excitation is measured, capturing kinetic parameters that are difficult to replicate. This dynamic approach maintains measurement simplicity while significantly enhancing authenticity security.
Solution Approach 2:
The patent changes the measurement parameter from spectral characteristics (wavelength, intensity) to temporal characteristics (luminescence decay time, rise time, persistence). By measuring how the luminescence signal evolves over time rather than just its spectral properties, the system achieves higher security while keeping the detection process accessible.
2Ease of operation
If conventional authenticity features are used, then the verification process is straightforward, but the ability to differentiate between similar substances is insufficient
Solution Approach 1:
The patent adds the time dimension to the measurement space. Instead of only measuring spectral properties (one dimension), the system measures luminescence intensity as a function of time, creating a temporal profile. This additional dimensional information enables precise differentiation between similar phosphor substances while maintaining straightforward verification procedures.
Solution Approach 2:
The patent applies a preliminary excitation step before measurement to generate the luminescence signal. By pre-exciting the optical storage phosphor with appropriate light or other energy, the system creates a time-resolved luminescence response that contains unique temporal fingerprints of the substance, enhancing differentiation capability without complicating the overall verification process.
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 security by creating a unique, specific connection between the authenticity feature and the verification process, making it difficult for imitators to replicate the document's authenticity, and allows for more precise differentiation between similar substances.
Implementation Method 1
The invention relates to an authenticity assessment method that uses the optically stimulated luminescence (OSL) of optical storage phosphors as an authenticity feature
Data Source
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AI summary
The invention relates to a method for verifying an authenticity feature comprising a storage phosphor, a verification device, an authenticity feature, and a value document comprising an authenticity feature. The authenticity feature includes a storage phosphor. According to the disclosed method, in one step, the storage phosphor is subjected to at least one query sequence, each of which comprises at least a first reading process and a second reading process. Furthermore, at least a first read measured value and a second read measured value are acquired which are based on the detection of an optical emission in response to the first and the second associated reading process, respectively. In another step, a time series of the read measured values is established, said time series being associated with the at least one query sequence and comprising at least the first read measured value associated with the first reading process and the second read measured value associated with the second reading process. The time series of the read measured values which is associated with the query sequence is analyzed in another step in order to determine a dynamic behavior from said time series of the read measured values under the associated query sequence.