Fluorescence Phosphorescence Detection Positional Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluorescence/phosphorescence detectors face challenges in reducing the difference between the position where fluorescence is detected and the position where phosphorescence is detected, due to the need for excitation light accumulation during sheet transport.
Innovation Solution
The detector controls the light source to apply a varying amount of light to the sheet, with a smaller amount applied during phosphorescence detection compared to fluorescence detection, and adjusts the light emission based on the transport speed of the sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultraviolet light is supplied in advance to accumulate excitation energy in the sheet, then phosphorescence detection capability is improved, but the positional difference between fluorescence detection and phosphorescence detection increases
Solution Approach 1:
The system performs preliminary excitation light supply at a first position before the sheet reaches the detection position. This allows excitation energy to be accumulated in advance in the sheet, ensuring sufficient phosphorescence signal when detection occurs, while the sheet continues to be transported to the detection position
Solution Approach 2:
The system separates the excitation light supply position from the detection position along the sheet transport path. The excitation unit and detection unit are positioned at different locations, allowing independent optimization of excitation energy accumulation and detection accuracy
2Use of energy by moving object
If the sheet is transported while being irradiated with ultraviolet light for accumulation, then excitation energy is sufficient for phosphorescence, but the position where fluorescence is detected differs from the position where phosphorescence is detected
Solution Approach 1:
The system adds the time dimension to the detection process by using a temporal gate that opens only during the brief moment when the sheet passes the detection position. This allows the system to accumulate excitation energy over a longer period at the excitation position while maintaining positional accuracy at the detection position through precise timing
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 effectively reduces the positional difference between fluorescence and phosphorescence detection, enabling more accurate and synchronized measurement of both phenomena.
Implementation Method 1
detect the fluorescence characteristics of a transported sheet while irradiating the sheet with excitation light
Implementation Method 2
detect phosphorescence emitted from the sheet with the excitation light turned off
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a fluorescence/phosphorescence detector, a sheet handling device, and a fluorescence/phosphorescence detection method which can reduce the difference between the position where fluorescence is detected and the position where phosphorescence is detected. The present invention relates to a fluorescence/phosphorescence detector that detects fluorescence and phosphorescence emitted from a transported sheet, the detector including: a light source configured to irradiate a transported sheet with light; a light source control unit configured to control the light source; a light receiving unit configured to receive fluorescence and phosphorescence emitted from the sheet and output fluorescence data and phosphorescence data; and a data acquisition unit configured to acquire fluorescence data and phosphorescence data from the light receiving unit, the light source control unit being configured to turn on the light source in a first predetermined period, turn on the light source in a second predetermined period after the first predetermined period, and keep the light source turned off for a third predetermined period after the second predetermined period, the data acquisition unit being configured to acquire fluorescence data on fluorescence received by the light receiving unit in the second predetermined period and acquire phosphorescence data on phosphorescence received by the light receiving unit in the third predetermined period.