Photoluminescence Sensor Edge Detection for Security Verification
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Solution Overview
Problem
Current photoluminescence sensor devices face challenges in accurately verifying security features on moving objects due to limitations in detecting the precise position and authenticity of security features, especially when they are integrated into or attached to counterfeit objects.
Innovation Solution
A photoluminescence sensor device that generates electromagnetic radiation to stimulate luminescent materials in security features, receiving and evaluating the time-dependent signals to determine the contribution of luminescence radiation and the position of the object's edges within the measuring area, allowing for accurate verification of the security feature's authenticity and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photoluminescence sensor devices are used to verify security features on moving objects, then the verification capability is improved, but the accuracy in determining the precise position and authenticity of security features deteriorates
Solution Approach 1:
The patent applies preliminary action by determining the position of object edges before performing security feature verification. The system first detects edge positions using the photoluminescence sensor, establishes a reference coordinate system, and then uses this pre-established spatial framework to accurately locate and verify security features. This preliminary positioning step enables subsequent precise measurement of security feature positions and authenticities.
2Difficulty of detecting and measuring
If photoluminescence sensor devices detect security features on moving objects, then the detection capability is improved, but the difficulty in detecting precise position and authenticity increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the photoluminescence signals from moving objects and using this information to adjust and refine position determination. The system evaluates the temporal profile of photoluminescence signals, compares them with reference data, and provides feedback to improve the accuracy of security feature location and authenticity assessment in real-time during object movement.
Solution Approach 2:
The system performs preliminary calibration and reference measurement before actual detection. It first establishes baseline photoluminescence characteristics of genuine security features, creates reference position maps, and sets detection parameters. This preliminary preparation enables the system to subsequently detect moving objects and their security features with high precision despite the challenges of motion.
3Reliability
If the sensor device verifies security features on moving objects, then the verification reliability is improved, but the time required for accurate position determination increases
Solution Approach 1:
The patent applies periodic action by using pulsed illumination and sampling the photoluminescence signal at regular time intervals during object movement. The system emits excitation light in periodic pulses and measures the photoluminescence response at corresponding periodic intervals, enabling efficient data acquisition that balances verification reliability with processing speed. This periodic sampling approach reduces the total measurement time while maintaining accurate position determination.
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 the reliability of verifying security features by accurately determining the position and authenticity of security features on moving objects, making it difficult for forgers to create counterfeit objects with integrated security features.
Implementation Method 1
The substance or substances are irradiated with electromagnetic radiation of a suitable wavelength matched to the respective excitation energy of the substance, whereby this can also be several discrete wavelengths and/or one or more wavelength ranges. The excitation causes the at least one substance to emit luminescence radiation.
Implementation Method 2
the electromagnetic radiation emanating from the object - depending on the relative position of the object and the receiving device and depending on the electromagnetic radiation generated by the radiation generating device and impinging on the object - comprises the luminescence radiation emitted by the photoluminescent substance and/or electromagnetic radiation reflected by the object
Data Source
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AI summary
The invention relates to a photoluminescence sensor device (1) for detecting a security feature (23) of an object (22a) moving relative to the sensor device (1) in a measuring region (ME) of the sensor device (1), wherein the sensor device (1) comprises: a radiation generation device (17) which is designed to generate electromagnetic radiation, wherein the electromagnetic radiation is suitable for prompting an emission of luminescence radiation via a photoluminescent material of the security feature (23); a receiving device (19) which is designed to receive electromagnetic radiation coming from the object (22a) moving relative to the sensor device (1) over a detection time period and to generate a corresponding time-dependent receive signal (ES), wherein, according to the relative position of the object (22a) and the receiving device (19) and according to the electromagnetic radiation generated by the radiation generation device (17) and impinging on the object (22a), the electromagnetic radiation coming from the object (22a) includes the luminescence radiation emitted by the photoluminescent material and/or electromagnetic radiation that was generated by the radiation generation device (17) reflected by the object (22a); and an evaluation device (26) which is designed to evaluate the time-dependent receive signal (ES), wherein the evaluation device (26) is designed to determine whether luminescence radiation emitted by the photoluminescent material has contributed to the time-dependent receive signal (ES), and the evaluation device (26) is also designed to determine a time (UE1, UE2, UEM) or a time interval in which at least one part of an edge (22b) of the object (22a) is located in a corresponding location (EO) in the measuring region (ME).