Particle Detection via Fluorescence and Raman Scattering
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Solution Overview
Problem
Conventional particle detecting devices inaccurately detect fluorescent particles due to interference from substances that emit light in the fluorescent range, such as moisture, leading to incorrect identification of microorganism particles.
Innovation Solution
A particle detecting device equipped with a light source, fluorescence measuring instrument, and Mie scattered light measuring instrument, which evaluates the presence of Raman-scattered light and fluorescent light to differentiate between fluorescent particles and moisture, ensuring accurate detection of fluorescent particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a particle detecting device uses fluorescence measurement to detect microorganism particles, then detection capability is improved, but false detection occurs when moisture or other light-emitting substances are present
Solution Approach 1:
The patent segments the detection process into two independent measurement channels: fluorescence measurement and Raman scattered light measurement. By dividing the detection function into separate modules that measure different physical phenomena, the system can distinguish between true fluorescent particles and moisture interference, thereby resolving the contradiction between detection capability and false positive rate
Solution Approach 2:
The patent introduces Raman scattered light measurement as an intermediary indicator to mediate between the excitation beam and the final detection result. The Raman signal serves as a proxy for moisture presence, allowing the system to adjust or filter fluorescence measurements based on the intermediary Raman data, thus eliminating false positives while preserving true detections
2Device complexity
If the device measures only fluorescent light, then the detection process is simple, but it cannot distinguish between fluorescent particles and moisture
Solution Approach 1:
The patent makes the measurement system multi-functional by enabling it to perform both fluorescence measurement and Raman scattered light measurement using the same excitation beam and detection apparatus. This universal approach allows a single device to achieve both simple operation and high precision particle identification by analyzing multiple light properties simultaneously
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
The device accurately distinguishes between fluorescent particles and moisture, preventing false positives and enabling precise detection of fluorescent particles in fluids, including gases and liquids.
Implementation Method 1
a fluorescence measuring instrument that measures light in a fluorescent band, which is produced in a region that is illuminated by the excitation beam
Implementation Method 2
an evaluating portion that evaluates whether or not the light that is measured by the fluorescence measuring instrument includes Raman-scattered light and florescent light
Data Source
AI summary
A particle detecting device includes: a fluorescence measuring instrument that measures light in a fluorescent band, which is produced in a region that is illuminated by an excitation beam from a light source; and an evaluating portion that evaluates whether the light measured by the fluorescence measuring instrument includes Raman-scattered light and florescent light, to evaluate that a fluorescent particle is included in the fluid if the evaluation is that the measured light includes florescent light, and to evaluate that the fluid does not include a fluorescent particle if the evaluation is that the measured light does not include fluorescent light, to evaluate that moisture is included in the fluid if there is an evaluation that the measured light includes Raman scattered light, and to evaluate that the fluid does not include moisture if there is an evaluation that the measured light does not include Raman scattered light.