Magnetoresistive Sensor Array for Bank Note Magnetic Imaging
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Solution Overview
Problem
Current bank note processing machines using magnetoresistive detectors can only detect the presence or absence of magnetic features on bank notes, lacking the capability to image the entire note, which limits the information gathered and the potential for further analysis.
Innovation Solution
A system comprising a transport device, data processing device, and a first detector device with multiple magnetoresistive sensors positioned along the path to capture the magnetic features of a passing bank note, allowing for the creation of a 'snapshot' image of the entire note through repeated readings and subsequent analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If current magnetoresistive detectors are used to detect magnetic features, then detection capability is provided, but only presence or absence information is obtained without imaging capability
Solution Approach 1:
The detector system is divided into multiple discrete magnetoresistive sensor elements arranged in an array, where each sensor independently detects magnetic field changes at its specific location. This segmentation enables spatial mapping of magnetic features across the entire bank note surface, transforming single-point detection into distributed imaging capability while maintaining relatively simple individual sensor designs
Solution Approach 2:
The system transitions from one-dimensional presence/absence detection to two-dimensional spatial mapping by arranging sensors in a grid pattern across the bank note width. This dimensional expansion allows reconstruction of the complete magnetic feature image through coordinated readings from multiple sensors positioned at different locations
2Loss of information
If multiple magnetoresistive sensors are positioned along the transport path to capture magnetic features, then imaging capability is achieved, but detection speed may be reduced
Solution Approach 1:
The magnetoresistive sensor array operates continuously as the bank note passes through the detection zone, with all sensors simultaneously reading magnetic field changes across the note width. This continuous parallel detection eliminates sequential scanning delays and maintains high processing throughput while capturing complete magnetic feature images in a single pass
Solution Approach 2:
The system employs more sensor elements than strictly minimum required, distributing them across the entire transport path to ensure complete coverage of the bank note. This excessive sensor placement enables redundant readings and improves signal reliability without significantly impacting processing speed, as the added sensors operate in parallel during the note's passage
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 the retention and further examination of bank note images, enhancing the detection of magnetic features and attributes, facilitating decisions on note processing, such as authenticity verification and wear assessment.
Implementation Method 1
a first detector device operably coupled with the data processing device, the first detector device comprising a plurality of magnetoresistive sensors positioned proximate the transport device and oriented so as to enable detection of the magnetic features of the adjacent surface of the passing bank note
Data Source
AI summary
A system and method for obtaining a fill image of a bank note being processed. At least one magnetoresistive detector is employed to obtain line-scan sensings of a bank note as the note passes. A central processing unit obtains the sensing as magnetic pattern data which is subsequently stored in a database for processing.