Document Material Fingerprinting via Optical Spectroscopy
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Solution Overview
Problem
Current methods for uniquely identifying security or value documents are complex and lack a simplified approach to ensure unique identification based on inherent material properties.
Innovation Solution
A method utilizing a determinable material property, or 'material fingerprint,' to uniquely identify documents through optical measurement of properties like transmission, absorption, and emission, which can be spectrally resolved and compared within predetermined tolerances, allowing for unique assignment and identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical measurement methods are used to determine material properties for document identification, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and utilizes inherent material properties (optical properties like transmission, absorption, reflection, emission) that naturally exist in the document materials themselves. By measuring these pre-existing properties rather than introducing complex external identification mechanisms, the method achieves precise document identification while avoiding additional device complexity. The material properties serve as built-in identification markers that require only simple optical measurement.
Solution Approach 2:
The document materials themselves provide the identification information through their inherent optical properties. The measurement system does not need to impose external identification features on the document; instead, it simply reads the material's natural characteristics. This self-service approach allows precise identification using minimal measurement equipment, as the document's material composition inherently contains the identification data.
2Reliability
If multiple optical properties are measured for unique identification, then reliability is improved, but measurement time increases
Solution Approach 1:
The patent combines multiple optical property measurements (transmission, absorption, reflection, emission) into a unified identification process. By simultaneously evaluating several material properties rather than sequentially testing each one, the method achieves reliable document identification while minimizing measurement time. The combined optical signature provides robust identification without requiring time-consuming separate measurements of each property.
Solution Approach 2:
The patent measures optical properties across different wavelengths or spectral ranges to create a comprehensive material fingerprint. By varying the measurement parameters (wavelength, intensity) and analyzing the material's response across multiple parameters simultaneously, the system achieves high reliability identification in a single measurement cycle rather than requiring multiple sequential measurements.
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
Enables simplified and secure unique identification of security or value documents by leveraging inherent material properties, enhancing authenticity verification and reducing complexity in comparison processes.
Implementation Method 1
The material test parameter and the material comparison parameter can be determined using an optical measurement method. In this way, the security or valuable document can be uniquely identified by means of an optically tunable material signature.
Implementation Method 2
Documents WO 2014/060362A1 and US 2016/0078707A1 describe methods for authenticating an object that has a film substrate, in particular a polymer film, which is birefringent when light enters it.
Data Source
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AI summary
The invention relates to a method for uniquely identifying a document (1) which is designed as a security or valuable document, wherein the method comprises the following steps: providing a document (1) which is made of one or more materials; determining a material comparison parameter for a material property in at least one material section (4) of the document (1); storing the comparison data specifying the material comparison parameter in a local memory of the document (1) and/or a central database (3); and identifying the document (1), wherein a material test parameter is determined for the at least one material section (4) and/or a further material section of the document (1) which differs from the at least one material section (4).The comparison data from the local storage of the document (1) and/or the central database (3) are read and compared with test data specifying the material test parameter; and the document (1) is determined to be uniquely identified if, upon comparison of the test data and the comparison data, it is found that the material test parameter corresponds to the material comparison parameter within predefined parameter limits. Furthermore, a security or value document (1) is provided.