Ultrasonic Document Examination for Adhesive Connection Detection
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Solution Overview
Problem
Current methods for detecting counterfeit documents, particularly denomination forgery, face challenges in recognizing adhesive connections between parts of a document, as these connections are difficult to identify with certainty using existing machine checking devices.
Innovation Solution
A method utilizing ultrasonic sensors to measure and spatially resolve ultrasonic properties of documents, forming location-dependent measurement data to identify differences in surface areas, which can indicate counterfeiting by differing ultrasonic properties, and an evaluation device processes this data to form an authenticity signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adhesive connections between document parts are examined using conventional checking devices, then the detection of denomination forgery is attempted, but the adhesive connections cannot be recognized easily and with certainty
Solution Approach 1:
The patent replaces conventional mechanical/optical checking devices with ultrasonic sensing technology. Ultrasonic sensors emit sound waves that interact with adhesive connections differently than genuine document materials, enabling detection through acoustic property variations rather than visual or tactile examination. This substitution achieves reliable adhesive connection detection while maintaining reasonable device complexity.
Solution Approach 2:
The patent utilizes changes in ultrasonic wave parameters (such as attenuation, velocity, or reflection characteristics) when passing through or reflecting off adhesive connections versus genuine document materials. By measuring these parameter variations, the system can distinguish between authentic and forged documents with high precision without requiring complex mechanical inspection mechanisms.
2Reliability
If document parts are joined by gluing to create denomination forgery, then the forged document becomes difficult to detect with simple checking devices, but ultrasonic sensing can identify the differences in ultrasonic properties
Solution Approach 1:
The patent replaces difficult visual or tactile detection methods with ultrasonic sensing that exploits fundamental differences in acoustic properties between adhesive materials and genuine document substrates. This substitution transforms a difficult detection problem into a reliable measurement process based on physical property differences.
Solution Approach 2:
Analogous to color changes, the patent detects differences in ultrasonic wave characteristics (such as attenuation coefficients or propagation velocity) that serve as acoustic 'signatures' for different materials. Adhesive connections exhibit distinct ultrasonic properties compared to genuine document materials, enabling reliable detection through these acoustic variations.
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
Effectively detects counterfeiting by identifying variations in ultrasonic properties across a document's surface, allowing for robust and reliable authentication of documents without requiring recognition of adhesive connections, thereby preventing the use of counterfeit denominations.
Implementation Method 1
at least one ultrasonic property of the document of value is measured by means of an ultrasonic sensor
Data Source
Figure 1~6d
Figure 2~4
Figure 5~7c
AI summary
Described is a method for examining a document of value of a predefined type for the purpose of identifying a suspected forgery, in particular, an assembled forged document, in which at least one ultrasonic property of the document of value is detected in a spatially resolved manner by generating location-dependent measurement data, in which the location-dependent measurement data are used to examine whether a predefined examination area of the document of value contains two sections that have ultrasonic properties that differ from one another according to a predefined distinguishing criterion, and in which an authenticity signal is generated to indicate the results of the examination. A corresponding examination device is also described.