Banknote Validator Using Multi-Wavelength Spectral Imaging
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Solution Overview
Problem
Existing banknote validation systems are not sufficiently efficient or accurate for automated teller machines, as they typically rely on a single image wavelength, limiting their reliability and speed in validating banknotes for payment purposes.
Innovation Solution
A banknote validation apparatus and method that uses a plurality of wavelengths of light to illuminate and detect images of the banknote, generating a three-dimensional matrix representation of the banknote's spectral information, allowing for improved validation by exposing multiple portions of the banknote to light as it moves along a note path, using a polychromatic light source, slit aperture, and diffractive elements for high spatial and spectral resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single wavelength detection method is used, then the device complexity is reduced, but the measurement precision and reliability of banknote validation deteriorates
Solution Approach 1:
The patent transitions from single-wavelength detection to multi-wavelength spectral imaging, adding the wavelength dimension to the detection process. This creates a three-dimensional data matrix (x, y, wavelength) that significantly improves validation accuracy by capturing spectral characteristics across multiple wavelengths simultaneously.
Solution Approach 2:
The imaging means are designed to detect light across a broad spectral range (380-780nm), enabling the same detection system to validate multiple types of banknotes with different security features. This multi-functional capability improves measurement precision without proportionally increasing device complexity.
2Measurement precision
If multiple wavelengths are detected simultaneously, then the measurement precision improves, but the loss of time increases
Solution Approach 1:
The banknote is moved continuously along a defined path through the validation apparatus while spectral imaging is performed. This continuous movement allows sequential capture of spectral data across the entire banknote surface without stopping, maintaining high validation accuracy while minimizing validation time.
Solution Approach 2:
The system pre-defines the note path and aperture positions to optimize the sequence of spectral image capture. By planning the detection path in advance and positioning apertures strategically, the system captures all necessary spectral data efficiently during continuous banknote movement, reducing total validation time.
3Illumination intensity
If the light source emits over a large spatial range, then the illumination intensity is improved, but the manufacturing precision of the spectral image deteriorates
Solution Approach 1:
An aperture is introduced to extract and select specific portions of the broad-spectrum light from the light source. This aperture selectively transmits light at defined positions and wavelengths, creating sharp spectral images with high resolution while maintaining sufficient illumination intensity for accurate detection.
Solution Approach 2:
The aperture acts as an intermediary element between the broad-spectrum light source and the banknote. It filters and shapes the light to achieve both adequate illumination intensity and high spectral image resolution, resolving the contradiction between these two parameters.
4Productivity
If the banknote moves continuously through the validation apparatus, then the productivity increases, but the measurement precision may deteriorate
Solution Approach 1:
The system uses periodic illumination and detection cycles synchronized with the continuous movement of the banknote. Light sources are activated and detection is performed at regular intervals along the note path, ensuring that spectral images are captured at optimal moments during banknote transit, maintaining both high speed and high precision.
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 the accuracy and efficiency of banknote validation by creating a comprehensive spectral image of the banknote, enabling reliable identification of its validity in real-time, suitable for automated systems.
Implementation Method 1
imaging means for detecting light reflected or transmitted by the banknote
Implementation Method 2
imaging means for detecting light reflected or transmitted by the banknote
Implementation Method 3
a diffractive element to split the incident light reflected/transmitted from the banknote into its constituent wavelengths
Data Source
AI summary
Apparatus for checking the validity of a banknote wherein a light source illuminates a banknote through a slit as it is transported along a note path, the emitted light being detected at different wavelengths to generate a plurality of images such that a three dimensional matrix can be created, for comparison against matrices of authentic banknotes.