Offset Sensor Units for High-Speed Paper Fluorescence Detection
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Solution Overview
Problem
Conventional methods fail to detect phosphorescent light on paper sheets with high precision, especially when the sheets are transported at high speeds, due to the need for separate sensors for fluorescent and phosphorescent light detection and the inability to accurately capture weak emission intensities.
Innovation Solution
A fluorescence and phosphorescence detecting apparatus with two sensor units arranged above and below a transport path, each equipped with a light source, image sensor, and filters, allowing for simultaneous detection of fluorescent and phosphorescent light with offset light receiving lenses and image sensors, and using gain correction coefficients to enhance image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensors are used for fluorescent and phosphorescent light detection, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent combines fluorescent and phosphorescent light detection into a single sensor by merging the detection functions. The sensor simultaneously captures both types of light emissions from the paper sheet, eliminating the need for separate sensors while maintaining detection capability for both fluorescent and phosphorescent materials through unified image processing
Solution Approach 2:
The sensor is designed with multi-functionality to detect both fluorescent and phosphorescent light emissions. By equipping the sensor with appropriate filters and using image processing techniques, it universally detects different types of luminescent materials, replacing multiple specialized sensors with one versatile detection device
2Productivity
If high speed transport is implemented, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The patent implements continuous detection during high-speed transport by maintaining constant illumination and continuous image capture. The sensor continuously monitors the paper sheet as it moves through the device, ensuring uninterrupted detection of fluorescent and phosphorescent emissions even at high transport speeds
Solution Approach 2:
The system performs preliminary actions by pre-positioning the paper sheet in the detection area and pre-synchronizing the sensor activation with the transport mechanism. This ensures that detection is optimally timed and positioned before the actual measurement occurs, maintaining precision during high-speed operation
3Measurement precision
If offset arrangement of light receiving lenses and image sensors is used, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent resolves the offset arrangement complexity by transitioning to a different dimensional configuration. Instead of lateral offset arrangements that require complex mechanical positioning, the system uses vertical stacking or integrated modular units where lenses and sensors are arranged in layers, simplifying the structural implementation while maintaining the beneficial offset detection geometry
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 precise detection of both fluorescent and phosphorescent light on moving paper sheets, improving the visibility of phosphorescent areas with weak emission intensity and allowing for accurate authentication of paper sheets.
Implementation Method 1
When the fluorescent material and the phosphorescent material on the paper sheet are irradiated with an excitation light of a predetermined wavelength band, a fluorescent light and a phosphorescent light are excited
Implementation Method 2
The fluorescent light disappears as soon as the irradiation of the excitation light is stopped; however, the phosphorescent light is emitted for awhile even after stopping the irradiation of the excitation light
Implementation Method 3
a light receiving unit in the apparatus receives fluorescent light excited on the banknote because of the light emission
Data Source
AI summary
To detect a fluorescent light and a phosphorescent light emitted from a paper sheet with a high precision, a fluorescence and phosphorescence detecting apparatus includes two sensor units. Each sensor unit includes a light source that emits an ultraviolet light on the paper sheet, an image sensor that captures images of the fluorescent light and the phosphorescent light excited on the paper sheet by irradiation of the ultraviolet light, and a light receiving lens that guides the fluorescent light and the phosphorescent light excited on the paper sheet to the image sensor. The two sensor units are arranged above and below the transport path and opposing each other across the transport path, and the light receiving lenses and the image sensors in the two sensor units are off-set along a transport direction of the paper sheet.