Particle Detection via Interference Evaluation and Fluorescence Verification
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Solution Overview
Problem
Existing particle detecting devices struggle to accurately differentiate between fluorescent and non-fluorescent particles in fluids, leading to incorrect particle counting due to interference between scattered lights from multiple particles.
Innovation Solution
A particle detecting device equipped with a light source, fluorescence measuring instrument, and scattered light measuring instrument that evaluates constructive and destructive interference to accurately count particles, distinguishing between fluorescent and non-fluorescent particles based on wavelength and measurement time variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If scattered light measurement is used to detect particles, then particle detection capability is improved, but measurement precision deteriorates due to constructive and destructive interference between scattered lights from multiple particles
Solution Approach 1:
The patent segments the measurement process into two distinct channels: scattered light measurement and fluorescent light measurement. By separating these measurement functions, the system can identify particles through scattered light while using fluorescent light as a verification mechanism to eliminate false positives caused by interference patterns in the scattered light channel.
Solution Approach 2:
The patent introduces fluorescent light measurement as an intermediary verification step. The fluorescent light acts as a mediator that confirms whether a scattered light signal corresponds to an actual particle or is merely an interference artifact. This intermediary measurement resolves the precision problem without sacrificing detection capability.
2Adaptability or versatility
If fluorescent light measurement is used to identify fluorescent particles, then particle differentiation capability is improved, but device complexity increases due to requiring multiple measurement instruments
Solution Approach 1:
The patent merges the scattered light measurement and fluorescent light measurement into a single integrated particle detection system. The light source, measurement instruments, and particle counting logic are combined into one device, allowing simultaneous multi-parameter measurement without requiring separate independent systems. This reduces operational complexity while maintaining differentiation capability.
Solution Approach 2:
The particle detection device is designed with multi-functionality, capable of performing both scattered light measurement for general particle detection and fluorescent light measurement for specific particle identification. The single device can adapt its measurement mode based on the detection needs, providing universal particle analysis capabilities without requiring multiple specialized instruments.
3Quantity of substance
If multiple particles are present in the measurement region, then detection coverage is improved, but measurement precision deteriorates due to interference between scattered lights from multiple particles
Solution Approach 1:
The patent implements a feedback mechanism where the fluorescent light measurement results are used to verify and correct the particle count derived from scattered light measurement. When scattered light indicates multiple particles but fluorescent light shows fewer or no particles, the system uses this feedback to identify and eliminate false positive detections caused by interference, thereby maintaining precision even when multiple particles are present.
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 and counting of particles, preventing false positives from interference and ensuring accurate differentiation between fluorescent and non-fluorescent particles, even in complex interference scenarios.
Implementation Method 1
If a particle is included in the gas, then the particle that is illuminated by the light will produce scattered light
Implementation Method 2
if the particle is a microorganism particle board a non-microorganism fluorescent particle, then the particle that is illuminated with light will emit fluorescence
Implementation Method 3
an interference status evaluating portion that evaluates whether the scattered light that is measured is producing constructive interference or producing destructive interference
Data Source
AI summary
A particle detecting device includes: a light source that illuminates, with an excitation beam, a fluid that contains a plurality of particles; a fluorescence measuring instrument that measures, at at least two different wavelengths, fluorescence that is produced in a region that is illuminated by the excitation beam; a scattered light measuring instrument that measures scattered light that is produced in a region that is illuminated by the excitation beam; an interference status evaluating portion that evaluates whether the scattered light that is measured is producing constructive interference or producing destructive interference; and a particle counting portion that counts a plurality of particles depending on the measured interference of the measured light, and counts fluorescent particles that are subject to detection, from among the plurality of particles, based on a wavelength of fluorescent measured.